arduino把数字显示在lcd上（ArduinoLCD1602屏幕实现遥控计算器）
arduino把数字显示在lcd上（ArduinoLCD1602屏幕实现遥控计算器）/* This is an IR Remote Controlled Calculator. I have tried to get rid of all the bugs that I have seen in other calculators made using an arduino. This calculator can be used like a normal calculator you can make simultaneous calculations with this add points etc. The LCD Display used here is a RG1602A you may refer to this article to understand how to use the display https://create.arduino.
这个计算器由一个 LCD1602 屏幕和一个 Arduino UNO 组成，可以实现遥控输入数字进行加减乘除的运算。我知道，这没有意义，好吧，我没有键盘，但是我有红外遥控器和接收器，所以我想，为什么不应该将遥控器用作键盘。
这个例子是学习 LCD1602 和遥控驱动的很好的范例。
所需材料如下：
Arduino UNO R3
LCD1602 液晶屏
红外线接收器
220 欧姆电阻
1k 欧姆电阻2个
红外遥控器
Arduino 库：
IRremote by shirriff z3t0 ArminJo – v2.5.0
LiquidCrystal by Arduino Adafruit – v1.0.7
连接方式如下表
https://github.com/Jaagrav/IRcalculator/
编程
这是使遥控计算器正常工作所需的代码。只需将代码复制并粘贴到您的 Arduino IDE 中，现在我在代码中留下了一些注释。
/*
This is an IR Remote Controlled Calculator.
I have tried to get rid of all the bugs that I have seen
in other calculators made using an arduino. This calculator
can be used like a normal calculator you can make
simultaneous calculations with this add points etc.
The LCD Display used here is a RG1602A
you may refer to this article to understand how to use the display
https://create.arduino.cc/projecthub/najad/interfacing-lcd1602-with-arduino-764ec4
All you need to do is connect the wires in the corresponding
pins written down below and edit the IR Codes:
|------#------Arduino Pins------LCD RG1602A--------------------|
|----- 1 ---- GND ----- VSS V0 (With 2K ohm) RW K -----|
|----- 2 ---- 5V ----- VDD A (With 220 ohm) -----|
|----- 3 ---- 12 ----- RS -----|
|----- 4 ---- 11 ----- E -----|
|----- 5 ---- 5 ----- D4 -----|
|----- 6 ---- 4 ----- D5 -----|
|----- 7 ---- 3 ----- D6 -----|
|----- 8 ---- 2 ----- D7 -----|
|--------------------------------------------------------------|
|------#------Arduino Pins------IR Transmitter-----------------|
|----- 1 ---- 10 ----- Out -----|
|----- 2 ---- GND ----- GND -----|
|----- 3 ---- 5V ----- Power -----|
|--------------------------------------------------------------|
Check it out on Github: https://github.com/Jaagrav/IRcalculator/
*/
#include <IRremote.h>
#include <LiquidCrystal.h>
#include <math.h>
// Digital Pin Connections to your LCD
const int
rs = 12
en = 11
d4 = 5
d5 = 4
d6 = 3
d7 = 2;
LiquidCrystal lcd(rs en d4 d5 d6 d7);
// Digital Pin Connection to your IR Receiver
IRrecv irrecv(10);
decode_results results;
String
number1 = "0"
number2 = "0"
optr = "="
sixteenString = " ";
/*
In the below switch-case replace the numbers with the IR codes
from your remote. Make sure you write the code that gets printed
in your serial monitor from line 142.
*/
void acceptInput(int character) {
Serial.println(character);
switch(character) {
case 2222:
concatNumbers("1");
break;
case -31092:
concatNumbers("2");
break;
case 18888:
concatNumbers("3");
break;
case 10000:
concatNumbers("4");
break;
case -22203:
concatNumbers("5");
break;
case 26666:
concatNumbers("6");
break;
case 6333:
concatNumbers("7");
break;
case -25537:
concatNumbers("8");
break;
case 22222:
concatNumbers("9");
break;
case 12222:
concatNumbers("0");
break;
case 28888:
concatNumbers(".");
break;
case 255:
number1 = "0";
number2 = "0";
optr = "=";
break;
case 32222:
function(" ");
break;
case -28870:
function("-");
break;
case 24444:
function("/");
break;
case 8444:
function("x");
break;
case 45555:
if(optr != "=")
calculate("=");
break;
case 4333:
backSpace();
break;
default:
Serial.println("Invalid Input");
}
}
void setup() {
Serial.begin(9600);
lcd.begin(16 2);
irrecv.enableIRIn();
}
void loop() {
if (irrecv.decode(&results)) {
unsigned int result = results.value;
String val = String(result);
acceptInput(val.toInt());
irrecv.resume();
}
lcd.setCursor(0 0);
lcd.print(optr " " sixteenString.substring(number1.length() 3) number1);
lcd.setCursor(0 1);
lcd.print(sixteenString.substring(number2.length()) number2);
}
void calculate(String op) {
double no1 = number1.toDouble();
double no2 = number2.toDouble();
double calcVal = 0.0;
if(optr == " ")
calcVal = (no1 no2);
else if(optr == "-")
calcVal = (no1 - no2);
else if(optr == "x")
calcVal = (no1 * no2);
else if(optr == "/")
calcVal = (no1 / no2);
number1 = toString(calcVal);
number2 = "0";
optr = op;
}
String toString(double num) {
return String(num);
}
void function(String e) {
if(number1 != "0" && number2 != "0") {
calculate(e);
}
else if(number1 == "0") {
number1 = number2;
number2 = "0";
}
optr = e;
}
void concatNumbers(String num) {
if(optr == "=")
number1 = "0";
if(num != "."){
if(number2.length() == 1 && number2 == "0")
number2 = num;
else
number2 = num;
}
else {
if(number2.charAt(number2.length()-1) != '.' && number2.indexOf('.') == -1)
number2 = num;
}
}
void backSpace() {
number2 = number2.substring(0 number2.length() - 1);
if(number2 == "")
number2 = "0";
}
打开 Arduino IDE 的串口监视器（CTRL SHIFT M）。上传代码到 Arduino 之后，用遥控器对准红外接收头按下某些按键。可以观察到串口监视器会出现数字。
