Eroare de compilare: main.c: In function 'setup': main.c:9:3: warning: implicit declaration of function 'pinMode' [-Wimplicit-function-declaration] pinMode(trig_pin, OUTPUT); ^~~~~~~ main.c:9:21: error: 'OUTPUT' undeclared (first use in this function) pinMode(trig_pin, OUTPUT); ^~~~~~ main.c:9:21: note: each undeclared identifier is reported only once for each function it appears in main.c:10:21: error: 'INPUT' undeclared (first use in this function) pinMode(echo_pin, INPUT); ^~~~~ main.c:11:3: error: 'Serial' undeclared (first use in this function) Serial.begin(9600); ^~~~~~ main.c: In function 'loop': main.c:16:3: warning: implicit declaration of function 'delay' [-Wimplicit-function-declaration] delay(1000); ^~~~~ main.c:17:3: error: 'Serial' undeclared (first use in this function) Serial.print("Ping: "); ^~~~~~ main.c:18:16: warning: implicit declaration of function 'distanta' [-Wimplicit-function-declaration] Serial.print(distanta()); ^~~~~~~~ main.c: At top level: main.c:22:7: error: conflicting types for 'distanta' float distanta() ^~~~~~~~ main.c:18:16: note: previous implicit declaration of 'distanta' was here Serial.print(distanta()); ^~~~~~~~ main.c: In function 'distanta': main.c:26:3: warning: implicit declaration of function 'digitalWrite' [-Wimplicit-function-declaration] digitalWrite(trig_pin, HIGH); ^~~~~~~~~~~~ main.c:26:26: error: 'HIGH' undeclared (first use in this function) digitalWrite(trig_pin, HIGH); ^~~~ main.c:27:3: warning: implicit declaration of function 'delayMicroseconds' [-Wimplicit-function-declaration] delayMicroseconds(10); ^~~~~~~~~~~~~~~~~ main.c:28:26: error: 'LOW' undeclared (first use in this function) digitalWrite(trig_pin, LOW); ^~~ main.c:29:8: warning: implicit declaration of function 'pulseIn' [-Wimplicit-function-declaration] ping=pulseIn(echo_pin, HIGH, time_out); ^~~~~~~ Non zero exit status: 1