Project 19 8*16 dot matrix-light control

1.Project instruction

The light sensor feature that resistance is inverse proportion to to light intensity. Based on this characteristics, we made a night light. In this chapter, we will show you light column on dot matrix.

2.Project Principle

The signal pin of light sensor is linked with A6 of MAX development board. 8*16 dot matrix will show the height of light column, the darker the light intensity is, the shorter the height of light column.

3.Project circuit

4.Project code

#include <Wire.h>
#include "Keyestudio_LEDBackpack.h"
#include "Keyestudio_GFX.h"
int mic = A7;
Keyestudio_8x16matrix matrix = Keyestudio_8x16matrix();
int Mic_val;

void setup() 
{
  Serial.begin(9600);
  Serial.println("16x8 LED Matrix Test");
  pinMode(mic,INPUT);
  matrix.begin(0x70);  // pass in the address
}

void loop() 
{
  Mic_val=analogRead(mic);
  Mic_val=map(Mic_val,0,1023,0,10);
  matrix.clear();
  matrix.drawCircle(3,8,Mic_val, LED_ON);
  matrix.writeDisplay();  // write the changes we just made to the display
  delay(10);
}

5.Project results

Wire up, open Arduino IDE and download code. Place the control board as follows.

The photoresistor of control board detects the light intensity.

The stronger the light intensity is, the more LED on.