Tutorial VII: INA219 Voltage And Current Monitoring Demo

Modules Usage Tutorial

• How To Install Arduino IDE
• Tutorial I: Motor With Encoder Control Demo
• Tutorial II: Motor Without Encoder Control Demo
• Tutorial III: ST3215 Serial Bus Servo Control Demo
• Tutorial IV: PWM Servo Control Demo
• Tutorial V: IMU Data Reading Demo
• Tutorial VI: SD Card Reading Demo
• Tutorial VII: INA219 Voltage And Current Monitoring Demo
• Tutorial VIII: OLED Screen Control Demo
• Tutorial IX Lidar and Publishing Lidar Topics in ROS2
• UGV01 WIKI Main Page
• General Driver for Robots WIKI Main Page

INA219 Voltage And Current Detection

The General Driver for Robots has an onboard INA219 module, which can detect the power supply voltage and current of the driver board. The monitoring demo of the INA219 is provided below.

Demo

Upload Demo

Download the dependency library INA219_WE.

After downloading the zip package, open INA219.ino, connect the multifunctional driver board to the computer with a USB cable (here the Type-C port of the USB of the multifunctional driver board is inserted), click "Tools" → "Ports", and then click the new COM (COM26 in my case) that appears. Click "Tools" → "Ports", and then click the new COM port.

In Arduino IDE, click "Tools" → "Development Board" → "ESP32" → "ESP32 Dev Module". Upload the demo after selecting the board and the port. After uploading the demo, open the serial port monitor of Arduino IDE to monitor the power voltage and current.

Demo Analysis

// <<<<<<<<<<=========INA219: 0x42===========>>>>>>>>>>
#define S_SDA 32
#define S_SCL 33
#include <INA219_WE.h>
#include <Wire.h>
#define INA219_ADDRESS 0x42
INA219_WE ina219 = INA219_WE(INA219_ADDRESS);

float shuntVoltage_mV = 0.0;
float loadVoltage_V = 0.0;
float busVoltage_V = 0.0;
float current_mA = 0.0;
float power_mW = 0.0; 
bool ina219_overflow = false;

void InitINA219(){
  if(!ina219.init()){
    Serial.println("INA219 not connected!");
  }
  ina219.setADCMode(BIT_MODE_9);
  ina219.setPGain(PG_320);
  ina219.setBusRange(BRNG_16);
  ina219.setShuntSizeInOhms(0.01); // used in INA219.
}

void InaDataUpdate(){
  shuntVoltage_mV = ina219.getShuntVoltage_mV();
  busVoltage_V = ina219.getBusVoltage_V();
  current_mA = ina219.getCurrent_mA();
  power_mW = ina219.getBusPower();
  loadVoltage_V  = busVoltage_V + (shuntVoltage_mV/1000);
  ina219_overflow = ina219.getOverflow();
}

void allDataUpdate(){
    Serial.print("battery:");
    Serial.println(loadVoltage_V);
    Serial.print("current_mA:");
    Serial.println(current_mA);
}

void setup() {
  Wire.begin(S_SDA,S_SCL);
  Serial.begin(115200);
  while(!Serial){}
  InitINA219();
}

void loop() {
  InaDataUpdate();
  allDataUpdate();
  delay(1000);
}

Resource

• Demo