Sample Code for Arduino using Any Analog / Digital Sensor
Because all analog input sensor use 0-1023 to represent data between 0V – 5V (or 3.3V), digital sensor use threshold level,
these code simply display the value it reads into serial monitor and LCD 1602 I2C display.
Connect
- Vcc – 5V
- GND – GND
- A0 – A0
- D0 – D1 (Don’t use D0 Pin in Arduino, otherwise 「avrdude stk500_getsync() not in sync resp=0x30」 error occured)
Code To Display Using Serial Monitor:
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // 設定 LCD I2C 位址
const int analogPin = A0; //sensor output pin to Arduino analog A0 pin
const bool digitalPin = 1; //sensor output pin to Arduino analog D0 pin
float maxValue = 100.0; // To display percentage maxValue = 100, use other value such as 5.0 to represent 5V
void setup()
{
Serial.begin(9600); //Initialize serial port - 9600 bps
pinMode (analogPin, INPUT);
pinMode (digitalPin, INPUT);
//initial display
lcd.begin(16, 2); // 初始化 LCD，一行 16 的字元，共 2 行，預設開啟背光
for(int i = 0; i < 1; i++) {
lcd.backlight(); // 開啟背光
delay(250);
lcd.noBacklight(); // 關閉背光
delay(250);
}
lcd.backlight();
// 輸出初始化文字
lcd.setCursor(0, 0); // 設定游標位置在第一行行首
lcd.print("HK STEM CLUB");
lcd.setCursor(0, 1); // 設定游標位置在第二行行首
lcd.print("hkstem.club");
delay(1000);
}
int value_A0;
bool value_D0;
void loop()
{
value_A0=analogRead(analogPin);
value_D0=digitalRead(digitalPin);
float percent = value_A0 * (maxValue/1023.0); // use 100.0, 1023.0 instead of 100 / 1023 to prevent Arduino IDE treat as integer
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("A0:");
lcd.print(value_A0);
lcd.print(", ");
lcd.print(percent);
Serial.print(percent);
Serial.println(value_A0);
lcd.setCursor(0, 1);
lcd.print("D0:");
lcd.print(value_D0);
Serial.println(value_D0);
delay(500); // Print value interval.
}
