需要用到Arduino UNO的串口双向通信功能，以下源码：
int val;
void setup() {
Serial.begin(9600); // opensserial port, sets data rate to 9600 bps
while(Serial.read()>= 0){}//clear serialbuffer
}
void loop() {
if (Serial.available() > 0) {
delay(100); // 等待数据传完
int numdata = Serial.available();
val=Serial.read();
Serial.println(val);
if(val==49)
{
Serial.println("Test OK");
Serial.println(val);
}
while(Serial.read()>=0){} //清空串口缓存
}
// put your main code here, to run repeatedly:
}
串口调试
int val;
void setup() {
Serial.begin(9600); // opensserial port, sets data rate to 9600 bps
while(Serial.read()>= 0){}//clear serialbuffer
}
void loop() {
if (Serial.available() > 0) {
delay(100); // 等待数据传完
int numdata = Serial.available();
val=Serial.read();
Serial.println(val);
if(val==49)
{
Serial.println("Test OK");
Serial.println(val);
}
while(Serial.read()>=0){} //清空串口缓存
}
// put your main code here, to run repeatedly:
}
Arduino - -- 串口双向通信
原文：https://www.cnblogs.com/anandexuechengzhangzhilu/p/10719111.html
