我遇到了一个Arduino程序的小问题,我试图通过串行连接来读取处理中发送的命令。处理过程应通过串行连接向Arduino发送“H”或“L”。这个值在我的程序中存储为char,但是当我尝试执行Serial.write(“Value:%c”,val)时,出现“从'const char *'无效转换为'const uint8_t *'”错误。如果有人能够帮助我解决这个问题,那就太好了。我真的需要弄清楚这个值是什么,所以我可以重写我的程序。谢谢!无效的从'const char *'转换为'const uint8_t *'
代码如下规定:
char val; // variable to receive data from the serial port
int ledpin = 8; // LED connected to pin 48 (on-board LED)
void setup() {
pinMode(ledpin, OUTPUT); // pin 48 (on-board LED) as OUTPUT
Serial.begin(9600); // start serial communication at 9600bps
}
void loop() {
while (Serial.available()>0){
val=Serial.read();
}
//Serial.write("Value: %c",(char)val);
if(val == 'H') // if 'H' was received
{
Serial.write("Setting Value to High \n");
digitalWrite(ledpin, HIGH); // turn ON the LED
} else {
Serial.write("Setting Value to Low \n");
digitalWrite(ledpin, LOW); // otherwise turn it OFF
}
Serial.flush();
delay(100); // wait 100ms for next reading
}