Example Code for Arduino-Measure Light Source Flicker Frequency

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• Gravity: AS7341 Visible Light Sensor x1
• Wires
• Another main-controller x1
• LED x1

Software Preparation

• Arduino IDE
• Download and install the AS7341 library and Sample Code. (About how to install the library?)

Wiring Diagram

Connect an LED to the Digital pin 10 of another main-controller.

Other Preparation Work

Burn the codes to another main-controller for simulating 50Hz or 60Hz light flicker.

Sample Code

Sample Code 2- Measure light source flicker frequency

/*!
 * @file getFlicker.ino
 * @brief Read the flicker frequency of light source 
 * 
 * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author [fengli]([email protected])
 * @version  V1.0
 * @date  2020-07-16
 * @get from https://www.dfrobot.com
 * @url https://github.com/DFRobot/DFRobot_AS7341
 */
#include "DFRobot_AS7341.h"
/*!
 * @brief Construct the function
 * @param pWire IC bus pointer object and construction device, can both pass or not pass parameters, Wire in default.
 */
DFRobot_AS7341 as7341;


void setup(void)
{
  Serial.begin(115200);
  //Detect if IIC can communicate properly
  while (as7341.begin() != 0) {
    Serial.println("IIC init failed, please check if the wire connection is correct");
    delay(1000);
  }
}

void loop(void){
  uint8_t freq = 0;
  //Read the value of register flicker, through which the flicker frequency of the light source can be predicted
  freq = as7341.readFlickerData();
  if (freq == 1) {
    Serial.println("Unknown frequency");
  } else if (freq == 0) {
    Serial.println("No flicker");
  } else {
    Serial.print(freq);
    Serial.println("Hz");
  }
}

Sample Code 2.1 - Simulate 50Hz light flicker

//50HZ
//Burn the codes to another main-controller, and connect an LED onto the Digital pin 10 to provide 50Hz ambient light for getFlicker.ino. 

void setup() {
  pinMode(10, OUTPUT);
}

void loop() {
  digitalWrite(10, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(5);
  digitalWrite(10, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(5);
}

Sample Code 2.2 - Simulate 60Hz light flicker

//60HZ
//Burn the codes to another main-controller, and connect an LED onto the Digital pin 10 to provide 60Hz ambient light for getFlicker.ino.

void setup() {
  pinMode(10, OUTPUT);
}

void loop() {
  digitalWrite(10, HIGH);   // turn the LED on (HIGH is the voltage level)
  delayMicroseconds(4167);
  digitalWrite(10, LOW);   // turn the LED on (HIGH is the voltage level)
  delayMicroseconds(4167);
}

Result

Additional Information

Burn the codes to another main-controller, and connect an LED to the Digital pin 10 to simulate the light source of 50Hz or 60Hz.