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control arduino on board led using serial api
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| void setup() { | |
| Serial.begin(9600); | |
| pinMode(LED_BUILTIN, OUTPUT); | |
| } | |
| void loop() { | |
| int cmd = Serial.parseInt(); | |
| if(cmd == 1){ | |
| digitalWrite(LED_BUILTIN, HIGH); | |
| }else if (cmd == -1){ | |
| digitalWrite(LED_BUILTIN, LOW); | |
| } | |
| } |
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