Due to the product taking longer than usual to arrive.
Please inquire about the product every time before making payment. Thank you very much.
The Raspberry Pi 3 Model B+ is the latest addition to the Raspberry Pi 3 family, featuring a 64-bit quad core processor running at 1.4GHz, dual-band 2.4GHz WiFi 2.4/5GHz, Bluetooth 4.2/BLE, and PoE capability (via a separate PoE HAT add-on).
details
Broadcom BCM2837B0, Cortex-A53, 64-bit, Quad-core SoC at 1.4GHz
1GB LPDDR2 SDRAM
2.4GHz / 5GHz IEEE 802.11 b / g / n / ac Wireless LAN (WLAN)
Bluetooth Low Energy v4.2 (BLE)
Gigabit Ethernet via USB 2.0 (Max speed 300Mbps)
4 x USB 2.0 ports
GPIO 40 pin
Full Size HDMI, MIPI DSI display port, MIPI CSI camera port
4-pole stereo audio/composite video output port
MicroSD card slot for operating system and storage
Enable Power over Ethernet (PoE) (requires separate PoE HAT)
Power supply requirements - 5V/2.5A DC via micro USB or GPIO
Raspbian operating system
The Raspberry Pi 3 Model B+ is the latest product in the Raspberry Pi 3 range, boasting a 64-bit quad core processor running at 1.4GHz, dual-band 2.4GHz and 5GHz wireless LAN, Bluetooth 4.2/BLE, faster Ethernet, and PoE. capability via a separate PoE HAT. The dual-band wireless LAN comes with modular compliance certification, allowing the board to be designed into end products with significantly reduced wireless LAN compliance testing, improving both cost and time to market. The Raspberry Pi 3 Model B+ maintains the same mechanical footprint as both the Raspberry Pi 2 Model B and the Raspberry Pi 3 Model B.
Broadcom BCM2837B0, Cortex-A53, 64-bit, quad-core SoC @ 1.4GHz
1GB LPDDR2 SDRAM
2.4GHz/5GHz IEEE 802.11 b/g/n/ac Wireless LAN (WLAN)
Bluetooth Low Energy v4.2 (BLE)
Gigabit Ethernet over USB 2.0 (maximum throughput 300Mbps)
4 x USB 2.0 Ports
Extended 40-pin GPIO Header
Full Size HDMI, MIPI DSI display port, MIPI CSI camera port
4-pole stereo audio/composite video output port
MicroSD card slot for operating system and data storage
Power over Ethernet (PoE) enabled (requires separate PoE HAT)
Power supply requirements - 5V/2.5A DC via micro USB or GPIO
Raspberry Pi 4 Model B is the latest product in the popular Raspberry Pi range of computers. It offers ground-breaking increases in processor speed, multimedia performance, memory, and connectivity compared to the prior-generation Raspberry Pi 3 Model B+, while retaining backwards compatibility and similar power consumption. For the end user, Raspberry Pi 4 Model B provides desktop performance comparable to entry-level x86 PC systems. This product's key features include a high-performance 64-bit quad-core processor, dual-display support at resolutions up to 4K via a pair of micro-HDMI ports, hardware video decode at up to 4Kp60, 8GB of RAM, dual-band. 2.4/5.0 GHz wireless LAN, Bluetooth 5.0, Gigabit Ethernet, USB 3.0, and PoE capability (via a separate PoE HAT add-on). The dual-band wireless LAN and Bluetooth have modular compliance certification, allowing the board to be designed into end products with significantly reduced compliance testing, improving both cost and time to market.
Broadcom BCM2711, quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
8GB LPDDR4 SDRAM
2.4 GHz and 5.0 GHz IEEE 802.11b/g/n/ac wireless LAN, Bluetooth 5.0, BLE
True Gigabit Ethernet
2 x USB 3.0 ports, 2 x USB 2.0 Ports
Fully backwards compatible 40-pin GPIO header
2 x micro HDMI ports supporting up to 4K 60Hz video resolution
2-lane MIPI DSI/CSI ports for camera and display
4-pole stereo audio and composite video port
MicroSD card slot for loading operating system and data storage
Requires 5.1V, 3A power via USB-C or GPIO.
PoE (Power over Ethernet) enabled (requires PoE HAT)
Broadcom BCM2712 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU, with cryptography extensions, 512KB per-core L2 caches and a 2MB shared L3 cache
VideoCore VII GPU, supporting OpenGL ES 3.1, Vulkan 1.2
Dual 4Kp60 HDMI® display output with HDR support
4Kp60 HEVC decoder
LPDDR4X-4267 SDRAM (4GB and 8GB SKUs available at launch)
Dual-band 802.11ac Wi-Fi®
Bluetooth 5.0 / Bluetooth Low Energy (BLE)
microSD card slot, with support for high-speed SDR104 mode
2 × USB 3.0 ports, supporting simultaneous 5Gbps operation
2 × USB 2.0 ports
Gigabit Ethernet, with PoE+ support (requires separate PoE+ HAT)
2 × 4-lane MIPI camera/display transceivers
PCIe 2.0 x1 interface for fast peripherals (requires separate M.2 HAT or other adapter)
5V/5A DC power via USB-C, with Power Delivery support
Raspberry Pi standard 40-pin header
Real-time clock (RTC), powered from external battery
Power button
It's a Raspberry Pi designed into a keyboard.
Raspberry Pi 400 incorporates a purpose-built board based on Raspberry Pi 4. Featuring the same powerful processor, Raspberry Pi 400 has specially designed thermals to keep your computer cool and silent while you're hard at work.
The GPIO pins remain accessible, so if you want to explore beyond the desktop, you can connect components and prototype your projects.
Raspberry Pi OS
Edit documents. Organize your calendar. Get hands-on with programming. Connect with friends.
Raspberry Pi OS is our official supported operating system, so you'll get the smoothest performance from your new computer while you get stuff done.
Raspberry Pi 400 specifications
Broadcom BCM2711 quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.8GHz
4GB LPDDR4-3200
Dual-band (2.4GHz and 5.0GHz) IEEE 802.11b/g/n/ac wireless LAN
Bluetooth 5.0, BLE
Gigabit Ethernet
2 × USB 3.0 and 1 × USB 2.0 ports
Horizontal 40-pin GPIO header
2 × micro HDMI ports (supports up to 4Kp60)
H.265 (4Kp60 decode); H.264 (1080p60 decode, 1080p30 encode); OpenGL ES 3.1, Vulkan 1.0
MicroSD card slot for operating system and data storage
78- or 79-key compact keyboard (depending on regional variant)
5V DC via USB connector
Operating temperature: 0°C to +50°C ambient
Maximum dimensions 286 mm × 122 mm × 23 mm
The set includes:
1. Raspberry Pi400 integrated keyboard/Pi4-4GB, IT keyboard layout
Raspberry Pi camera module v2 is a high quality 8 megapixel Sony IMX219 image sensor custom designed add-on board for Raspberry Pi, featuring a fixed focus lens. It's capable of 3280 x 2464 pixel static images, and also supports 1080p30, 720p60 and 640x480p60/90 video. It attaches to Pi by way of one of the small sockets on the board upper surface and uses the dedicated CSi interface, designed especially for interfacing to cameras. The board itself is tiny, at around 25mm x 23mm x 9mm. It also weighs just over 3g, making it perfect for mobile or other applications where size and weight are important. It connects to Raspberry Pi by way of a short ribbon cable. The high quality Sony IMX219 image sensor itself has a native resolution of 8 megapixel, and has a fixed focus lens on-board. In terms of still images, the camera is capable of 3280 x 2464 pixel static images, and also supports 1080p30, 720p60 and 640x480p90 video.
8 megapixel camera capable of taking photographs of 3280 x 2464 pixels
Capture video at 1080p30, 720p60 and 640x480p90 resolutions
All software is supported within the latest version of Raspbian Operating System
Used in CCTV security camera, motion detection, time lapse photography
Micro SD Card brand Sandisk
The Sandisk microSD card is compatible with Android devices and is designed with an A1 performance rating. The higher speed and capacity means faster app loading, faster photo and video recording.
Available in capacities up to 512GB*, the Sandisk microSD card is designed for reliable, high-resolution photography, and full-HD video editing.
Sandisk microSD cards are tested to last even in the harshest environments, so you can take them with confidence that your photos, videos, and files are protected. Backed by a lifetime warranty.
Micro SD Card Canvas Select Plus Android A1 performance
Kingston Canvas Select Plus microSD is compatible with Android devices and is designed with A1 performance. The higher speed and capacity means faster app loading, faster photo and video capture.
Available in multiple capacities up to 512GB*, the Canvas Select Plus microSD card is designed for reliable, high-resolution photography, and full-HD video editing.
Kingston's Canvas card is tested to last even in the harshest environments, so you can take it with you with confidence that your photos, videos and files will be protected. It's backed by a lifetime warranty.
The Official Raspberry Pi HDMI cable is the perfect accessory to compliment your new Raspberry Pi 4 Model B board. This is a micro HDMI to standard HDMI cable which is 1m long and available in black or white. The high-performance Raspberry Pi HDMI cable supports 3D, 4K, 2K, 17.8Gbps, 2160P/60Hz and XVcolour.
Compatibility: Raspberry Pi 3 B+, 3, 2 and B+
Color / Material: Transparent Smoked Polycarbonate
Port access: Audio / Composite, HDMI, USB, microUSB, microSD
Cable Pass-throughs: GPIO, CSi, DSi
HAT Compatibility: Remove top of enclosure for HAT access
Tools Required: Completely tool-less
Mounting: Screw key-holes on bottom
Camera Compatibility: Compatible with Raspberry Pi Camera V1 and V2 (standard and NOIR)
This transparent enclosure for the Raspberry Pi combines great looks and great features that anyone can afford. It is an economical enclosure for your Raspberry Pi which is made of strong, transparent polycarbonate material to keep your Pi safe and looking good. Your Pi snaps securely in place without the use of any tools. All ports can be easily accessed and there's even a GPIO cable pass-through for prototyping. The tool-less design also has provisions for the Raspberry Pi Camera which also snaps right into place and safely protected.
Raspberry Pi Touch 7-inch Display 720p
Summary : Raspberry Pi Touch Display 2 is the long-awaited successor to our popular 7” Touch Display. It is a portrait-naƟve display offering:
7” diagonal display size
85-degree viewing angle
24-bit RGB
720x1280-pixel resolution
True multi-touch capacitive panel with five-finger touch
Broadcom BCM2712 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU, with cryptography extensions, 512KB per-core L2 caches and a 2MB shared L3 cache
VideoCore VII GPU, supporting OpenGL ES 3.1, Vulkan 1.2
Dual 4Kp60 HDMI® display output with HDR support
4Kp60 HEVC decoder
LPDDR4X-4267 SDRAM (4GB and 8GB SKUs available at launch)
Dual-band 802.11ac Wi-Fi®
Bluetooth 5.0 / Bluetooth Low Energy (BLE)
microSD card slot, with support for high-speed SDR104 mode
2 × USB 3.0 ports, supporting simultaneous 5Gbps operation
2 × USB 2.0 ports
Gigabit Ethernet, with PoE+ support (requires separate PoE+ HAT)
2 × 4-lane MIPI camera/display transceivers
PCIe 2.0 x1 interface for fast peripherals (requires separate M.2 HAT or other adapter)
5V/5A DC power via USB-C, with Power Delivery support
Raspberry Pi standard 40-pin header
Real-time clock (RTC), powered from external battery
Power button
Included
code
product
NF68465
SD Card 32GB
NF78136
Raspberry pi 5 Active cooler
Raspberry pi 5
NF57326
Micro HDMI To HDMI, 1m, Black
F89047
Raspberry pi 5 Adapter
F89048
Raspberry pi 5 Case
Input voltage: 5V DC supplied via four-pin fan header on Raspberry Pi 5
Fan speed control: Pulse width modulation control with tachometer
Maximum airflow: 2.79 CFM
Maximum fan speed: 8000 RPM +/- 15%
Case material: ABS (base, frame, lid) and PC (fan assembly)
Features
Integrated, temperature-controlled cooling fan that connects to the fan connector on Raspberry Pi 5
12mm × 17mm × 4mm heatsink with self-adhesive pad improves heat transfer from the processor
Easily removable lid exposes fan and breakout slot for cables and GPIO
Integrated mounting features allow for case stacking
HATs can be mounted to the enclosure with stand-offs and GPIO header extenders (not included)
Four silicone feet for the case are included.
Power Supply Stable and durable, multiple protection, more security Type-C connector, 5V 4A
Input Voltage Range : 90Vac to 264Vac
Rated Input Voltage : 100Vac to 240Vac
Input Frequency Range : 47Hz-63Hz
Input Current : 0.8A max. (I/P100-240Vac)
Size : L76*W44*32mm
Weight : 125g
Cable length : 1.2m
The power supply is suitable for use with Raspberry Pi 4 Model B 1/2/4/8 GB RAM.
RPI POWER SUPPLY USB-C-5.1V/3A, US BLACK; Accessory Type:RPI Power Supply USB-C-5.1V, 3A, US Black;
For Use With: Raspberry Pi 4; Product Range:RPi 4 Model B Power Supplies; SVHC:No SVHC
The Raspberry Pi AI HAT+ features a built-in neural network accelerator, turning your Raspberry Pi 5 into a high-performance, accessible, and power-efficient AI machine.
Available with 13 or 26 TOPS performance, it's suited to everything from entry-level applications to more complex neural processing, with the ability to process multiple concurrent models and AI tasks.
Input voltage: 5V DC supplied via four-pin fan header on Raspberry Pi 5
Fan speed control: Pulse width modulation control with tachometer
Maximum airflow: 1.09 CFM
Maximum fan speed: 8000 RPM +/- 15%
Product material: Anodised aluminum
Features
Single-piece anodised aluminum heatsink
Heatsink-mounted, temperature-controlled blower fan attached by three screws
Spring-loaded push pins for mounting onto Raspberry Pi 5
Pre-applied thermal pads for heat transfer
Important notes
We recommend that the Active Cooler is not removed once it is fitted to Raspberry Pi 5. Removal of the Active Cooler will cause the push pins and thermal pads to degrade and is likely to lead to product damage. Discontinue use of the Active Cooler if the push pins are damaged or deformed, or if they do not clip securely.
2.5 A 5.1 V power supply
1.5 m cable
Short circuit, over-current and over-voltage protection
Low standby current consumption
Class II double insulated
ERP level 6 efficiency rating
Professional, high quality ABS case designed specifically for the Raspberry Pi 4. The case keeps your device safe whilst maintaining full access to all the pins and ports.
Rugged 3-piece ABS construction
Ventilated base for passive cooling
Full access to all ports and pins
Featuring a quad-core 64-bit processor, 4GB of RAM, wireless networking, dual-display output, and 4K video playback, as well as a 40-pin GPIO header, Raspberry Pi 400 is a powerful, easy-to-use computer built into a neat and portable keyboard.
Raspberry Pi 400 specifications
Broadcom BCM2711 quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.8GHz
4GB LPDDR4-3200
Dual-band (2.4GHz and 5.0GHz) IEEE 802.11b/g/n/ac wireless LAN
Bluetooth 5.0, BLE
Gigabit Ethernet
2 × USB 3.0 and 1 × USB 2.0 ports
Horizontal 40-pin GPIO header
2 × micro HDMI ports (supports up to 4Kp60)
H.265 (4Kp60 decode); H.264 (1080p60 decode, 1080p30 encode); OpenGL ES 3.1, Vulkan 1.0
MicroSD card slot for operating system and data storage
78- or 79-key compact keyboard (depending on regional variant)
5V DC via USB connector
Operating temperature: 0°C to +50°C ambient
Maximum dimensions 286 mm × 122 mm × 23 mm
The set includes:
1. Raspberry Pi400 integrated keyboard/Pi4-4GB, US keyboard layout
2. 16GB microSD card, pre-programmed with Raspberry Pi OS
3. Raspberry Pi power supply(EU)
4. Raspberry Pi mouse
5. Micro-HDMI to HDMI-A cable( 1m white)
6. Official Raspberry Pi beginner's guide. English.
Products in the SET include:
code
product
F89093
Raspberry pi 3 Model B+
NF58191
Raspberry Pi 3b+ Adapter
NF68465
SD Card 32GB
F81945
Clear Enclosure for Raspberry pi3B+
NF65047
Heat Sink
NF71325
HDMI To HDMI, 1m
On top of that, we have provided you with detailed instructions on the use of Raspberry Pi and the use of each module, which including 8 lessons for module. Just click the LEARN tab to view this user manual. Also you can check the Vedio Guide here , which will tell you how to use this kit step by step.
All in all, whether you are a student, teacher, artist, hardware enthusiast, and so on, with the help of the Grove Base Kit for Raspberry Pi, you will get to know Raspberry Pi quickly and comprehensively. Part List
Grove Base Hat for Raspberry Pi
Grove - Red LED Button
Grove - Buzzer
Grove - Moisture Sensor
Grove - Temperature & Humidity Sensor (DHT11)
Grove - Light Sensor
Grove - mini PIR motion sensor
Grove - Ultrasonic Ranger
Grove - Relay
Grove - Servo
Grove - 16 x 2 LCD (White on Blue)
Within SET consists of
code
product
NF68465
SD Card 32GB
NF64899
Raspberry Pi CM4 Wireless 4G RAM Lite
NF64905
Raspberry pi Computer Module 4 mini Base Board
NF57325
Raspberry pi 4 adapter
Compute Module 4
It combines the power of the Raspberry Pi 4 in a compact size for deeper system use. It features a quad-core ARM Cortex-A72 processor, dual video outputs, and a wide range of other connectivity options. It's available in a variety of configurations, including a choice of RAM and eMMC Flash, and with or without wireless connectivity. There are 32 models to choose from.
Products that help you design with Compute Module 4
The Raspberry Pi Compute Module 4 IO board is an equally valuable development tool. The IO board exposes all the interfaces from the Compute Module 4 and provides a development platform and reference design for our most powerful Compute Module yet. It is also designed to be integrated with end products.
The Raspberry Pi Compute Module 4 antenna kit has been certified for use with the Raspberry Pi Compute Module 4.
Feature
Raspberry Pi Compute Module 4
Form factor
55 mm × 40 mm
Processor
Broadcom BCM2711 quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
Memory
4GB LPDDR4
Connectivity
Optional wireless LAN, 2.4GHz and 5.0GHz IEEE 802.11b/g/n/ac wireless, Bluetooth 5.0, BLE with onboard and external antenna options;
Onboard Gigabit Ethernet PHY supporting IEEE1588;
1 × USB 2.0 interface;
PCIe Gen 2 x1 interface;
28 GPIO signals;
SD card interface for SD card or external eMMC (for use only with Compute Module 4 variants without eMMC)
Video
Dual HDMI interface (up to 4Kp60 supported);
2-lane MIPI DSI display interface;
2-lane MIPI CSI camera interface;
4-lane MIPI DSI display interface
Multimedia
H.265 (4Kp60 decode); H.264 (1080p60 decode, 1080p30 encode); OpenGL ES 3.0 graphics
Input power
5V DC
Operating temperature
-20°C to +85°C
Production lifetime
Raspberry Pi Compute Module 4 will remain in production until at least January 2028
Compliance
For a full list of local and regional product approvals, please visit pip.raspberrypi.com
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Mini Base Board For Compute Module 4
Specifications
CM4 SOCKET
suitable for all variants of Compute Module 4
NETWORKING
Gigabit Ethernet RJ45 connector
M.2 M KEY, supports communication modules or NVME SSD
CONNECTOR
Raspberry Pi 40PIN GPIO header
USB
USB 2.0 Type A × 2, USB 2.0 via FFC connector × 2
DISPLAY
MIPI DSI display port (15pin 1.0mm FPC connector)
CAMERA
MIPI CSI-2 camera port × 2 (15pin 1.0mm FPC connector)
VIDEO
HDMI port × 2 (including one port via FFC connector), supports 4K 30fps output
RTC
N/A
STORAGE
MicroSD card socket for Compute Module 4 Lite (without eMMC) variants
FAN HEADER
no fan control, 5V
POWER INPUT
5V
DIMENSIONS
85 × 56mm
------------------------------------------------------------------------------------------------------------------------------------------------
The power supply is suitable for use with Raspberry Pi 4 Model B 1/2/4/8 GB RAM.
RPI POWER SUPPLY USB-C-5.1V/3A, US BLACK; Accessory Type:RPI Power Supply USB-C-5.1V, 3A, US Black;
For Use With:Raspberry Pi 4; Product Range:RPi 4 Model B Power Supplies; SVHC:No SVHC
----------------------------------------------------------------------------------------------------------------------------------------------
Micro SD 32GB
*SD Card has not been installed with Raspberry Pi operating system.
The new Raspberry Pi 400 kit features everything in one fully-enclosed compact unit, removing the need for multiple components, whilst delivering a clock speed of 1.8GHz, higher than other Raspberry Pi boards on the market. All that is required to start using the Raspberry Pi 400 as an out-of-the-box computer is a monitor. The start-up kit includes a Raspberry Pi 400, pre-programmed SD card, power supply, mouse, a beginner's guide and micro HDMI cable.
1.8GHz quad core ARM Cortex-A72 CPU, 4GB LPDDR4-3200 DRAM
VideoCore VI graphics (OpenGL ES 3.1, Vulkan)
4K UHD at 60Hz HEVC decoding
True gigabit Ethernet
2x USB 3.0 and 1x USB 2.0 ports
2x micro HDMI ports (1x 4K at 60Hz or 2x 4K at 30Hz)
USB-C for input power, supporting 5V 3A operation
Raspberry Pi-compatible 40-pin horizontal GPIO connector
Kensington lock
The set includes:
1. Raspberry Pi400 integrated keyboard/Pi4-4GB, IT keyboard layout
2. 16GB microSD card, pre-programmed with Raspberry Pi OS
3. Raspberry Pi power supply(EU)
4. Raspberry Pi mouse
5. Micro-HDMI to HDMI-A cable( 1m white)
6. Official Raspberry Pi beginner's guide. Italian.
Products in the SET include:
code
product
NF68465
SD Card 32GB
F85821
Raspberry Pi 400 IT Keyboard
NF57326
Micro HDMI TO HDMI Cable 1M
NF57325
Raspberry pi adapter
The DHT11 sensor is one of the most popular sensors for measuring temperature and humidity, especially in Arduino projects because it is easy to use, cheap, and readily available.
What is DHT11?
DHT11 is a sensor that measures temperature and relative humidity in the air. This sensor has a capacitive humidity sensor and a thermistor temperature sensor inside, which outputs digital data, making it very easy to connect to Arduino.
DHT11 specifications
list
details
Humidity measurement range
20–90% RH (±5% RH)
Temperature measurement range
0–50°C (±2°C)
Supply voltage
3.3V – 5.5V
Output signal
Single-wire digital
Read Rate
1 time/second (1Hz)
Number of legs
3 legs (VCC, GND, Data) or 4 legs (if it is a module but actually uses 3 legs)
Using DHT11 with Arduino
Wiring:
DHT11
Arduino
VCC
5V
GND
GND
DATA
Digital Pin (eg. D2)
Some models have a pull-up resistor (about 10KΩ) already attached to the module. If it is a bare sensor, you may need to connect your own resistance.
Arduino code example:
Requires DHT library, which can be installed via Library Manager.
define DHTPIN 2 // The pin connected to the DHT11's Data #define DHTTYPE DHT11 // The type of sensor
DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(9600); dht.begin(); }
void loop() { float h = dht.readHumidity(); float t = dht.readTemperature();
if (isnan(h) || isnan(t)) { Serial.println("Read failed!"); return; }
Serial.print("Humidity: "); Serial.print(h); Serial.print(" %\t"); Serial.print("Temperature: "); Serial.print(t); Serial.println(" *C"); delay(2000); // wait 2 seconds }
The MQ-2 sensor is a very popular gas sensor for use with Arduino and other microcontroller boards, and is ideal for home gas or smoke detection projects, such as gas leak alarms.
MQ-2 is
The MQ-2 is a gas sensor that can detect many types of gases such as:
LPG (cooking gas)
Butane gas
Propane gas
Methane gas (CH₄)
Hydrogen gas (H₂)
Smoke
alcohol
Inside the sensor is a heating coil and a SnO₂ (tin dioxide) gas detector, whose resistance changes in the presence of gas in the air, allowing it to be converted to an electrical signal.
MQ-2 specifications
list
details
Supply voltage
5V DC
Electrical power
About 800mW
Signal type
Analog and digital (depending on module)
Warm-up time
About 20 seconds to 2 minutes
Detectable gases
LPG, Methane, Alcohol, Propane, Hydrogen, Smoke
Detection range
Approximately 300 - 10,000 ppm
Number of legs
4 legs (VCC, GND, AOUT, DOUT)
AOUT (Analog Out) – Analog signal indicating gas level. DOUT (Digital Out) – Digital signal (1 or 0) when gas level exceeds set point.
Using MQ-2 with Arduino
Wiring:
MQ-2 Pin
Arduino Pin
VCC
5V
GND
GND
AOUT
A0 (Analog)
DOUT
D2 (Digital) (if used)
Some MQ-2 modules have a potentiometer (adjuster) to set the threshold level on DOUT.
Example code for use in Analog:
int mq2Pin = A0;
void setup() { Serial.begin(9600); }
void loop() { int gasLevel = analogRead(mq2Pin); Serial.print("gasLevel: "); Serial.println(gasLevel); delay(1000); }
Example of code for Digital usage:
int mq2Digital = 2;
void setup() { pinMode(mq2Digital, INPUT); Serial.begin(9600); }
void loop() { int gasDetected = digitalRead(mq2Digital);
if (gasDetected == LOW) { Serial.println("gas detect!"); } else { Serial.println("Safe"); }
delay(1000); }
Soil Moisture Sensor is a popular device in Smart Farm projects or automatic watering systems. It works with Arduino easily, is cheap, and is suitable for learning and experimenting.
Soil Moisture Sensor
Soil moisture sensor is a sensor that detects the moisture level in the soil by measuring the conductivity between the probe legs (similar to measuring the resistance of soil).
Dry soil → low conductivity → low value obtained
Moist soil → High conductivity → High obtained value
Sensors often come with a conversion module that provides both analog and digital pins.
Soil Moisture Sensor Specifications
list
details
Supply voltage
3.3V – 5V
Current used
About 10mA
Output signal
Analog (A0) and Digital (D0)
Detection range
General soil moisture levels
structure
2 probe legs (ground plug), signal converter board has a threshold adjustment potentiometer
The Digital Output will give a HIGH or LOW value according to the threshold we set.
Using with Arduino
Wiring:
Soil Sensor Pin
Arduino Pin
VCC
5V
GND
GND
A0 (Analog)
A0
D0 (Digital)
D2 (if used)
Analog code example:
------------------------------------------------------------------------------
int sensorPin = A0;
void setup() { Serial.begin(9600); }
void loop() { int value = analogRead(sensorPin); Serial.print("Soil moisture : "); Serial.println(value);
delay(1000); }
----------------------------------------------------------------------------------------------
The value returned by analogRead() will be between 0–1023.
High value = dry soil
Low value = moist soil
Digital code example:
----------------------------------------------------------------------
int sensorDigital = 2;
void setup() { pinMode(sensorDigital, INPUT); Serial.begin(9600); }
void loop() { int value = digitalRead(sensorDigital);
if (value == LOW) { Serial.println("Moist soil"); } else { Serial.println("Dry soil"); }
delay(1000); }
Additional tips:
Do not leave the sensor plugged into the ground for a long time (rust may occur).
Use the relay together with a water pump or electric valve to automatically water plants.
If you want more accuracy, try using a capacitive soil moisture sensor instead of the regular one (it is more durable and does not rust).
Relay is
Relay is an electrical switch that is controlled by an electrical signal. It is used for:
Control high voltage electrical devices (e.g. fans, 220V bulbs) with electrical signals from Arduino (5V).
This allows the Arduino to safely control high-current devices (since the Arduino cannot directly supply high current).
Relay Module is available in various types such as 1 Channel, 2 Channel, 4 Channel depending on the number of devices to be controlled.
Specifications of Relay 5V Module
list
details
Control pressure (Input)
5V DC (from Arduino)
Load voltage (Output)
Up to ~250V AC or 30V DC
Maximum load current
10A
Number of channels (Channel)
1, 2, 4 (select according to the number of devices to be controlled)
Logic Control
Active LOW (some models)
There is an optocoupler.
Some models have a circuit breaker to isolate the electrical circuit (safer).
Output legs (3 legs)
NO (Normally Open), NC (Normally Closed), COM (Common)
Using Relay with Arduino
Wiring (Example 1 Channel):
Relay Pin
Arduino Pin
VCC
5V
GND
GND
IN1
D7 (or as required)
The IN1 leg is used to turn the relay on/off.
If it is 2/4 Channel, there will be IN2, IN3, IN4 added.
Example of connecting electrical equipment to a house:
Warning: You should have knowledge of 220V electricity and be very careful.
Use an extension cord or an electrician if you are not sure.
Connection:
COM → Connect to AC power (input line)
NO → Connect to the device you want to turn on/off (light, fan).
When Arduino sends a signal → Relay closes the circuit → Power goes to the device.
Code example:
int relayPin = 7;
void setup() { pinMode(relayPin, OUTPUT); }
void loop() {
digitalWrite(relayPin, LOW); // Open relay (some models LOW means open)
delay(3000); // leave open for 3 seconds
digitalWrite(relayPin, HIGH); // close relay
delay(3000); // wait another 3 seconds }
If your relay is Active HIGH, switch LOW and HIGH.
What can it be used with?
Turn on/off 220V light bulbs
Water pump control
Order to turn on the fan/electrical appliance
Make a Smart Home System
Working voltage : DC 5 V Static current : 3 mA Working temperature : 0 ~ + 70 Output way : GPIO Induction Angle : Less than 15 Detection range : 2 cm to 4 m Detecting precision : 0.3 cm + 1% Sensor size : Approx. 45.1 x 20 x 14.5mm
It is used for directional control, similar to that used in video games, by providing an analog output using two potentiometers to read the position of the joystick.
MC-38 Normally Closed <Normally Closed principle is together, the signal is on, with the wired host use can not be used alone>
MC-38 is normally closed: the magnet is close to the conduction, the magnet is away from the circuit breaker.
MC-38A is normally open: the magnet is close to the closed (disconnected), the magnet is away from the open circuit
Action distance: 18mm ± 6mm
Lifetime: 1,000,000 times Switching output: often closed (together with the conductive) Open type, suitable for non-ferrous doors or windows Surface mountin
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