How to Use DFRobot DFR0971 GP8403 0-5V/10V 12-bit: Examples, Pinouts, and Specs

The DFRobot DFR0971 GP8403 is a high-precision analog-to-digital converter (ADC) designed to convert analog signals into digital data with 12-bit resolution. It supports input voltage ranges of 0-5V or 0-10V, making it ideal for interfacing with a wide variety of sensors and analog devices. This component is particularly useful in applications requiring accurate signal measurement and processing, such as industrial automation, environmental monitoring, and IoT systems.

• Sensor data acquisition (e.g., temperature, pressure, or light sensors)
• Industrial control systems
• Data logging and monitoring
• IoT devices requiring high-precision analog signal conversion
• Robotics and automation systems

The following table outlines the key technical details of the DFRobot DFR0971 GP8403 ADC:

The DFR0971 module has a simple pinout for easy integration into circuits. The table below describes each pin:

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to ground.
2. I2C Communication: Connect the SDA and SCL pins to the corresponding I2C pins on your microcontroller (e.g., Arduino UNO).
3. Analog Inputs: Connect the analog signals to the A0 and/or A1 pins. Ensure the input voltage does not exceed the selected range (0-5V or 0-10V).
4. I2C Address Configuration: Use the ADDR pin to set the I2C address if multiple DFR0971 modules are used in the same circuit.
5. Voltage Range Selection: Configure the input voltage range (0-5V or 0-10V) using the onboard jumper or configuration settings.

• Input Voltage Range: Ensure the input voltage does not exceed the selected range to avoid damaging the module.
• I2C Pull-Up Resistors: If your microcontroller does not have built-in pull-up resistors on the I2C lines, add external pull-up resistors (typically 4.7kΩ) to the SDA and SCL lines.
• Noise Reduction: To minimize noise, use short and shielded wires for the analog input signals.
• Power Supply Stability: Use a stable and noise-free power supply to ensure accurate ADC readings.

The following example demonstrates how to read analog data from the DFR0971 using an Arduino UNO:

#include <Wire.h>

// I2C address of the DFR0971 module (default: 0x48)
#define DFR0971_I2C_ADDRESS 0x48

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Initialize serial communication for debugging
  Serial.println("DFR0971 ADC Example");
}

void loop() {
  uint16_t adcValue = readADC(0); // Read from channel 0
  float voltage = (adcValue / 4095.0) * 5.0; // Convert to voltage (0-5V range)
  
  Serial.print("ADC Value: ");
  Serial.print(adcValue);
  Serial.print(" | Voltage: ");
  Serial.print(voltage, 3); // Print voltage with 3 decimal places
  Serial.println(" V");
  
  delay(500); // Wait 500ms before the next reading
}

// Function to read ADC value from a specific channel
uint16_t readADC(uint8_t channel) {
  Wire.beginTransmission(DFR0971_I2C_ADDRESS);
  Wire.write(channel); // Send the channel number (0 or 1)
  Wire.endTransmission();
  
  Wire.requestFrom(DFR0971_I2C_ADDRESS, 2); // Request 2 bytes of data
  if (Wire.available() == 2) {
    uint8_t highByte = Wire.read(); // Read the high byte
    uint8_t lowByte = Wire.read();  // Read the low byte
    return (highByte << 8) | lowByte; // Combine the two bytes into a 12-bit value
  }
  return 0; // Return 0 if no data is available
}

1. No Data from the ADC

   • Cause: Incorrect I2C wiring or address mismatch.
   • Solution: Verify the SDA and SCL connections and ensure the I2C address matches the module's configuration.

2. Inaccurate Readings

   • Cause: Noise in the analog input signal or unstable power supply.
   • Solution: Use shielded cables for analog inputs and ensure a stable power source.

3. Module Not Detected

   • Cause: Missing pull-up resistors on the I2C lines.
   • Solution: Add 4.7kΩ pull-up resistors to the SDA and SCL lines.

4. Voltage Range Misconfiguration

   • Cause: Incorrect jumper setting for the input voltage range.
   • Solution: Check and adjust the jumper to match the desired range (0-5V or 0-10V).

1. Can I use this module with a 3.3V microcontroller?

   • Yes, the DFR0971 supports both 3.3V and 5V logic levels.

2. How do I change the I2C address?

   • Use the ADDR pin to set a different I2C address. Refer to the module's datasheet for address configuration details.

3. What is the maximum sampling rate?

   • The module supports a maximum sampling rate of 240 samples per second.

4. Can I use both analog channels simultaneously?

   • Yes, you can read from both A0 and A1 channels sequentially using the I2C interface.