CJMCU-75 LM75A I2C Temperature Sensor Development Board

Description

Tutorial: How to Use CJMCU-75 LM75A I2C Temperature Sensor Module

The CJMCU-75 LM75A I2C Temperature Sensor Module measures ambient temperature with precision. Useful for environmental monitoring, climate control, and thermal control projects.

What you need

• Arduino or compatible
• I2C cable
• 4.7kΩ pull-up resistor
• Multimeter

Steps

1. 1. Connect the module to the Arduino I2C bus.
2. 2. Attach the pull-up resistor between VCC and SCL/SDA.
3. 3. Load the provided Arduino code.
4. 4. Check the temperature with Serial Monitor.
5. 5. Verify connections and the resistor.
6. 6. Add another temperature sensor to the circuit.
7. 7. Calibrate the sensor.
8. 8. Save data to EEPROM.

Example code

```cpp
#include <Wire.h>
#include <LM75.h>

LM75 tempSensor;

void setup() {
  Wire.begin();
  tempSensor.begin();
}

void loop() {
  Serial.print("Temperatura: ");
  Serial.println(tempSensor.readTemperature());
  delay(1000);
}
```

Mini project

Create an overvoltage warning system for an electronic device.

Common mistakes

• Forget the pull-up resistor.
• Connect VCC to GND.
• Do not verify the I2C connection.
• Omit I2C driver installation.

Recommended accessories

• Arduino Nano
• LCD 16×2 Display
• LiPo Battery
• 10kΩ Resistor

Frequently asked questions

How can I check the temperature?
Use Serial Monitor to display the temperature.

Why should I use a pull-up resistor?
Avoid I2C communication issues.

Can I use this module with a Raspberry Pi?
Yes, but you may need to install a specific driver.