LCD 在模拟环境中不工作
LCD doesn't work in a simulated enviroment
我正在使用 Tinkercad,由于这是我第一次对 LCD 编程,所以我只是复制了连接引脚并使其工作的程序。
问题是它只是亮了,没有显示任何东西,我尝试了连接和断开 R/W 引脚,但这也不起作用,什么都不会显示。
我错过了什么?代码其他功能正常。
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);
}
Fix - 我找不到错误,但我怀疑这是由于连接的奇怪布局造成的。您还尝试将光标设置为第 3 行,但您使用的 LCD 没有 3 行,它是 16x2 LCD
.
我做了什么 - 所以我所做的是我重新做了整个项目,我连接了一个新的 LCD,这次用了数字对比度,这样它就可以动态改变的。我还确保包括您在上一个项目中使用的传感器。整个项目是一个 Arduino 控制 LCD 并输出华氏度和毫伏的温度。
代码:
#include <LiquidCrystal.h>
// Adds the liquid crystal lib
int contrast = 40; // Set the contrast of the LCD
LiquidCrystal lcd (12, 11, 5, 4, 3, 2); // Instantiate the LCD
float fahrenheit;
float millivolts;
void setup ()
{
analogWrite(6, contrast); // Wrjte the contrast to the LCD
lcd.begin(16, 2); // Init the LCD
}
void loop ()
{
int sensor = analogRead(0);
millivolts = (sensor/1023.0)*5000;
fahrenheit = (((sensor*0.00488)-0.5)/0.01)*1.8+32;
lcd.setCursor(0, 0);
lcd.print("Temp(F):");
lcd.setCursor(11, 0);
lcd.print(fahrenheit);
lcd.setCursor(0, 1);
lcd.print("Volts(mV):");
lcd.setCursor(12, 1);
lcd.print(millivolts);
}
图表
我正在使用 Tinkercad,由于这是我第一次对 LCD 编程,所以我只是复制了连接引脚并使其工作的程序。
问题是它只是亮了,没有显示任何东西,我尝试了连接和断开 R/W 引脚,但这也不起作用,什么都不会显示。
我错过了什么?代码其他功能正常。
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);
}
Fix - 我找不到错误,但我怀疑这是由于连接的奇怪布局造成的。您还尝试将光标设置为第 3 行,但您使用的 LCD 没有 3 行,它是 16x2 LCD
.
我做了什么 - 所以我所做的是我重新做了整个项目,我连接了一个新的 LCD,这次用了数字对比度,这样它就可以动态改变的。我还确保包括您在上一个项目中使用的传感器。整个项目是一个 Arduino 控制 LCD 并输出华氏度和毫伏的温度。
代码:
#include <LiquidCrystal.h>
// Adds the liquid crystal lib
int contrast = 40; // Set the contrast of the LCD
LiquidCrystal lcd (12, 11, 5, 4, 3, 2); // Instantiate the LCD
float fahrenheit;
float millivolts;
void setup ()
{
analogWrite(6, contrast); // Wrjte the contrast to the LCD
lcd.begin(16, 2); // Init the LCD
}
void loop ()
{
int sensor = analogRead(0);
millivolts = (sensor/1023.0)*5000;
fahrenheit = (((sensor*0.00488)-0.5)/0.01)*1.8+32;
lcd.setCursor(0, 0);
lcd.print("Temp(F):");
lcd.setCursor(11, 0);
lcd.print(fahrenheit);
lcd.setCursor(0, 1);
lcd.print("Volts(mV):");
lcd.setCursor(12, 1);
lcd.print(millivolts);
}
图表