Arduino Development Boards & Accessories

NEO6M GPS Receiver Module for Arduino or Other Microcontrollers 

13.56 Mhz RFID Reader and Writer with Tag and Card for use with Arduino or other microcontrollers

A popular and easy to use RC522 RFID module, complete with an RFID card and RFID tag.

Designed to work with Arduino and other microcontrolers.

Can be used to read or write to many different RFID cards, fobs, stickers etc.

12V 150mA 1.8W Solar Panel 

Specs

5V 500mA 2.5W Solar Panel 

Specs

28BYJ-48 Stepper Motor wih ULN2003 IC & Driver Board

CP2102 bassed USB to UART bridge controler for use with many IOT or microcontroller projects

Waterproof digital temperature probe for Arduino and other microcontroler projects

Length : 1M

Example project: 

 

DS18B20 High Accuracy Digital Thermometer.

 

This DS18B20 digital thermometer is extremely useful as a tool for measuring temperature for all kinds of different applications. It has a very wide temperature range (-55°C to 110°C) and high accuracy, especially at temperatures between -10°C to 85°C.  In this project, we will be using an Arduino to read the temperature from the probe and display it on an LCD screen equipped with a KY1602 module.

 

Here’s what you will need: 

 

Tools

Breadboard

Jumper Leads - Male to Male x 3

Jumper Leads – Male to Female x 4 

 

Components

DS18B20 Temperature Probe x 1

Arduino Uno x 1 or Arduino Nano x 1

LCD1602B LCD Screen x 1

KY1602 Parallel to Serial Converter x 1

Libraries

DS18B20 V1.0.0 Arduino Library

OneWire

LiquidCrystal I2C

Step 1

First, you will need to connect the probe to the breadboard. This should be easy to do since the probe comes with pre-tinned leads. Simply push the ends of the leads into the breadboard sockets and use a 4.6kΩ pull-up resistor on the data pin as shown in fig.1. Now, you will need to connect the Arduino to the breadboard. Use the jumper leads to connect the male to male jumper leads to connect the power, ground and digital pin to the breadboard. 

 

Step 2

Solder the KY1602 module onto the 1602 LCD screen. Pin 1 on the KY1602 module is the one closest to the 4 data and power pins. Once soldered, you can now connect the LCD display to the Arduino as shown in fig.1:

 

Fig. 1

Step 3

Connect the Arduino to your computer and install the libraries mentioned above. If you need help installing the libraries, CLICK HERE for a quick tutorial.
 

Step 4

You can now start writing the code to get this all working: 


First, clear the IDE window. Then, include the aforementioned libraries:

#include <DS18B20.h>
#include <LCD_I2C.h>

Initialize the KY1602 I2C LCD driver (address 0x27 in this example) and specify the LCD display (in this case 16 characters, 2 rows):

 
DS18B20 ds(12);
LCD_I2C lcd(0x27, 16, 2);
 

Initialize the LCD display and turn on the LCD backlight. This is done inside the void setup function:

 
void setup() {
lcd.begin();
lcd.backlight();
}
 

Start a while loop. This is done inside the void loop function:

 
void loop() {
while (ds.selectNext()) {
 

Set the cursor to the first character and display the temperature in ºF and ºC:

 
lcd.setCursor(0,0);
  lcd.print(ds.getTempC());
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print(ds.getTempF());
  lcd.print((char)223);
  lcd.print("F");
  }
 

Choose how often to update the screen (in this case, 800ms):

 
  delay(800);
}
 

The completed code should look like this:

 
#include <DS18B20.h>
#include <LCD_I2C.h>

DS18B20 ds(12);
LCD_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.begin();
  lcd.backlight();
}

void loop() {
  while (ds.selectNext()) {
  lcd.setCursor(0,0);
  lcd.print(ds.getTempC());
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print(ds.getTempF());
  lcd.print((char)223);
  lcd.print("F");
  }
  delay(800);
}

 

Soil hygrometer module with digital and analogue outputs for Arduino and other microcontroler projects

Alcahol Ethanol sensor module for Arduino and other microcontroller projects

Methane gas sensor module for Arduino and other microcontroler projects

Carbon Monoxide sensor module for Arduino and other microcontroler projects

What is the CJUMCU-811 Module?

CO2 and VOC indoor air quality sensor module for Arduino and other microcontroller projects

This module has a CCS811 module that is an ultra low powered digital gas sensor using a metal oxide multi compound sensor. The module uses the onboard MCU to manage the sensor and provide the needed Analogue to Digital conversion and I2C interface making it simple to add to your project. It will detect a wide range of VOCs including Carbon Monoxide and can convert this to an eCO2 (equivalent CO2) value.
 

Voltage: 3.3VDC 

Size: 21x15mm
 

How Can I use the CJUMCU-811 to test air quality and CO₂ levels?

Here is an example project for an air quality meter using the CJUMCU-811, an Arduino Uno and a 1602 LCD screen with a KY1602 to display CO2 levels and air quality:

Air Quality Sensor with LCD

In this project, we will be building an air quality station that can measure eCO₂ (estimated carbon dioxide) levels and a wide range of VOCs (Volatile Organic Compounds). High VOC levels can contribute to a wide range of health complications and high CO₂ levels (>1000ppm) can impair normal cognitive function, so it is useful to be able to monitor them.

Here’s what you will need:
 

Tools
Soldering Iron
Solder
Jumper Leads (male to female)

Components
CJMCU811 x 1
LCD1602B LCD screen x1
Arduino Uno x 1 or Arduino Nano x 1
KY1602 Parallel to Serial converter
 

Libraries

CCS811 Arduino Library

PCF8574 Arduino Library

Step 1
First you will need to assemble the project. The CJMCU should come with a set of pin headers that need to be soldered directly on it and the KY1602 should be soldered directly to the back of the LCD screen. Now, connect everything together using the wiring diagram below for reference.

Connecting the CJMCU811 to an Arduino       Connecting the KY1602 to an Arduino and a 1602 LCD 
CJMCU                           Arduino                     KY1602                          Arduino            LCD
VCC----------------------------3.3V                       VCC-----------------------------5V
GND----------------------------GND                      GND----------------------------GND
SCL------------------------------A5                        SCL-----------------------------A5
SDA-----------------------------A4                         SDA-----------------------------A4
                                                                        Pins 1-16---------------------------------------Pins 1-16*

 *pin 1 on the KY1602 is the one nearest to the 4 data and power pins

Step 2
Connect your Arduino to the PC and install the above Libraries. If you don’t know how to do this, CLICK HERE and follow the “Installing Arduino Libraries” section.

Step 3
We can now create the code to get this all working:

First, delete the code in the IDE window, then include the aforementioned libraries:  

 
#include <LCD_I2C.h>
#include <Wire.h>
#include "SparkFunCCS811.h"
 

Now, We need to declare the I2C devices and their addresses:  

 
#define CCS811_ADDR 0x5B
LCD_I2C lcd(0x27, 16, 2);
CCS811 sensor(CCS811_ADDR);
 

Initialize the I2C devices and turn on lCD backlight in the setup function:

 
void setup()
{
  Wire.begin();
  lcd.begin();
  lcd.backlight();

 

Start serial communication  

Serial.begin(115200);
delay(1000);

Check to see if the CJMCU is configured correctly, otherwise display error message:

 
if (sensor.begin() == false)
  {
  Serial.print("Sensor error. Check connection");
  while (1);
  }
 

Starting the void loop function. Check to see if the data from the sensor is available, and if so, read and calculate the results:

 
if (sensor.dataAvailable())
  {
  sensor.readAlgorithmResults();
 

Send the data via serial port:

 
Serial.print("CO2[");
  Serial.print(sensor.getCO2());
  Serial.print("] tVOC[");
  Serial.print(sensor.getTVOC());
 

Display the same data on the LCD display:

 
lcd.setCursor(0,0);
lcd.print("Est. CO2 - ");
  lcd.print(sensor.getCO2());
  lcd.setCursot(0,1);
lcd.print("Tot. VOC - ");
  lcd.print(sensor.getTVOC());
  }
 

Add 10ms delay to prevent overloading the I2C bus:

 
delay(10);
 

The completed code should look like this:

 
/* 
Connecting the CJMCU811 to an Arduino Uno or an Arduino Nano: 

CJMCU811 Arduino
VCC-------------->3V3
GND-------------->GND
SCL-------------->A5
SDA-------------->A4
*/
 
#include <lcd_i2c.h>
#include <wire.h>
#include "SparkFunCCS811.h"
LCD_I2C lcd(0x27, 16, 2); //Address of the KY1602 module
#define CCS811_ADDR 0x5A //if it doesn't work, change to 0x5B

CCS811 sensor(CCS811_ADDR);

void setup()
{
  Wire.begin(); //Initialize I2C Hardware

  lcd.begin(); // If you are using more I2C devices using the Wire.h library, use lcd.begin(false)

  lcd.backlight();

  Serial.begin(115200);  //Starting serial communication
  delay(1000);

 
  if (sensor.begin() == false)
  {
  Serial.print("Sensor error. Check connection");
  while (1);
  }
}

void loop()
{
  if (sensor.dataAvailable())//Check to see if data is ready with .dataAvailable(). if statement checking to see 
  {
  //If so, have the sensor read and calculate the results.
  sensor.readAlgorithmResults();
 
  Serial.print("CO2["); //Returns estimated CO2 reading
  Serial.print(sensor.getCO2());
  Serial.print("] tVOC[");//Returns calculated total VOC reading
  Serial.print(sensor.getTVOC());

  lcd.setCursor(0,0);
  lcd.print("Est. CO2 - ");
  lcd.print(sensor.getCO2());
  lcd.setCursor(0,1);
  lcd.print("Tot. VOC - ");
  lcd.print(sensor.getTVOC());
  }
  delay(10); //Prevents overloading of the I2C bus
}
 

Step 4 Press the “Upload” button at the top (button with tick, located below “File”). The IDE will now compile the code and upload it to your Arduino (this may take a few moments).

Step 5 To check if everything is working, open the serial monitor from the Arduino IDE (magnifying glass button in the top right corner) and see if you can get a reading. The CJMCU has to be left on for 24 hours before it will give a correct reading. If everything is connected correctly, the LCD should also show readings from the sensor.

Step 6 That’s it! You should now have a fully working air quality sensor. Now all you need to decide is what sort of enclosure you want to put it in. You can look at our high quality boxes HERE for ideas.

Infrared IR remote control and receiver kit for Arduino and other microcontroler projects

Vibration switch module for Arduino and other microcontroler projects