Example Code for Arduino-I2C Mode Output 5V in 0-5V Range

Hardware Preparation

• DFR1229 GP8600: I2C&PWM to 0-5V&0-10V&4-20mA ×1
• DFR0654 FireBeetle 2 ESP32-E ×1
• Multimeter ×1
• Several jumper wires

Software Preparation

• Download and install Arduino IDE: [Download Link]
• Download dependent libraries:
  • DFRobot_GP8XXX Library: [Download Link]
  • DFRobot_RTU Library: [Download Link]
• Library Installation Guide: [View Installation Tutorial]

Wiring Diagram

Connect the GP8600 module to the ESP32-E as shown in the diagram. The core corresponding relationships are as follows:

• Module I2C pin "+" → ESP32-E 3.3V
• Module I2C pin "-" → ESP32-E GND
• Module I2C pin "SCL" → ESP32-E SCL (default GPIO22)
• Module I2C pin "SDA" → ESP32-E SDA (default GPIO21)

Other Preparation Work

• DIP switch configuration: A0=0, A1=0, A2=0 (I2C address = 0x58)

Sample Code

Open Arduino IDE, copy the following code, and upload it to the ESP32-E:

#include <DFRobot_GP8XXX.h>

// Enable I2C communication mode
#define I2C_COMMUNICATION

// I2C address (modify according to the settings on the back of the module, default: 0x58)
#define MODULE_I2C_ADDRESS 0x58
DFRobot_GP8600_I2C GP8600(&Wire, MODULE_I2C_ADDRESS);

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Initialize the sensor; retry continuously if initialization fails
  while (GP8600.begin() != 0) {
    Serial.println("Communication with the device failed. Please check if the connection is normal or if the device address is set correctly.");
    delay(1000);
  }
  Serial.println("Successful connection!");
  
  // Set the DAC output range to 0-5V
  GP8600.setDACOutRange(GP8600.eOutputRange5V);
  
  // Set output data (0-65535 corresponds to 0-5V)
  uint16_t data = 65535;
  GP8600.setDACOutData(data);
}

void loop() {
  // No operations required in the loop
}

Result

1. Set the multimeter to the "DC V" range;
2. Connect the red probe to the module's "OUT" terminal and the black probe to the module's "GND" terminal;
3. Under normal conditions, the measured voltage should be close to 5V. In this example, the actual measured output voltage is 5.009V.