Arduino编译报错‘fatal error: WConstants.h: No such file or directory’
本帖最后由 弘毅 于 2018-11-20 09:13 编辑Arduino编译报错‘fatal error: WConstants.h: No such file or directory’ 该如何解决。按照网上的放发试过更新两个库函数还是没有用，而且只是个1602显示屏自带的测试程序，而且也没见调用过OneWire和DallasTemper两个函数呀，换了另外一个程序也是一样报这个错误 我该怎样处理？谢谢！！
//example use of LCD4Bit_mod library
#include <LCD4Bit_mod.h>
//create object to control an LCD.
//number of lines in display=1
LCD4Bit_mod lcd = LCD4Bit_mod(2);
//Key message
char msgs = {"Right Key OK ",
"Up Key OK ",
"Down Key OK",
"Left Key OK",
"Select Key OK" };
intadc_key_val ={30, 150, 360, 535, 760 };
int NUM_KEYS = 5;
int adc_key_in;
int key=-1;
int oldkey=-1;
void setup() {
pinMode(13, OUTPUT);//we'll use the debug LED to output a heartbeat
lcd.init();
//optionally, now set up our application-specific display settings, overriding whatever the lcd did in lcd.init()
//lcd.commandWrite(0x0F);//cursor on, display on, blink on.(nasty!)
lcd.clear();
lcd.printIn("KEYPAD testing... pressing");
}
void loop() {
adc_key_in = analogRead(0); // read the value from the sensor
digitalWrite(13, HIGH);
key = get_key(adc_key_in); // convert into key press
if (key != oldkey) // if keypress is detected
{
delay(50); // wait for debounce time
adc_key_in = analogRead(0); // read the value from the sensor
key = get_key(adc_key_in); // convert into key press
if (key != oldkey)
{
oldkey = key;
if (key >=0){
lcd.cursorTo(2, 0);//line=2, x=0
lcd.printIn(msgs);
}
}
}
//delay(1000);
digitalWrite(13, LOW);
}
// Convert ADC value to key number
int get_key(unsigned int input)
{
int k;
for (k = 0; k < NUM_KEYS; k++)
{
if (input < adc_key_val)
{
return k;
}
}
if (k >= NUM_KEYS)
k = -1; // No valid key pressed
return k;
}
需要把原来放进去的库，删除之后重新放一遍，需要更新的是这个文件的库#include <LCD4Bit_mod.h>
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