问题描述
我正在使用 Tinkercad,因为这是我第一次对 LCD 进行编程,所以我只是复制了连接引脚并使其工作的程序。
问题是它只是亮起而没有显示任何内容,我尝试了对 R/W 引脚进行接线和拆线,但这也不起作用,什么也不会显示。
电路图:
这是代码:
#include <LiquidCrystal.h>
const int pin = 0; // analog pin
float celsius = 0,farhenheit =0; // temperature variables
float millivolts; //Millivolts from the sensor
int sensor;
const int G_LED = 13;
const int Y_LED = 12;
LiquidCrystal lcd(10,9,5,4,3,2); // Building the LCD
void setup() {
lcd.begin(16,2);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("C="); // "C=","F=" and "mV" should be printed
lcd.setCursor(0,1); // on the LCD in a column
lcd.print("F=");
lcd.setCursor(0,2);
lcd.print("mV=");
pinMode(G_LED,OUTPUT);
pinMode(Y_LED,OUTPUT);
Serial.begin(9600);
}
void loop() {
sensor = analogRead(pin); // Reading the value from the LM35 sensor using the A0 ingress
millivolts = (sensor / 1023.0) * 5000; // Converting the value in a number that indicates the millivolts
celsius = ((sensor * 0.00488) - 0.5) / 0.01; // Celsius value (10 mV for each degree,0°=500mV)
farhenheit = celsius * 1.8 + 32; // Fahrenheit value
lcd.setCursor(4,2); // Set the cursor at the right of "mV="
lcd.print(millivolts); // Print the mV value
lcd.setCursor(4,0); // Same here for °C and °F
lcd.print(celsius);
lcd.setCursor(4,1);
Serial.print(farhenheit);
if (millivolts < 700) { // Green LED is on when the temperature is under or equal to 20°
// if (celsius < 20) { // Alternative
analogWrite(G_LED,255);
analogWrite(Y_LED,0); }
else {
analogWrite(G_LED,0);
analogWrite(Y_LED,255); // Yellow LED is on when the temperature is above of 20°C
}
delay(1000);
}
解决方法
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