Bump: I figured out the solution. The HC 06 was DOA
I bought a new one and everything works perfectly
hey i used the example from the analog serial read and get the reversed question marks, i dont think it has to do with the code but maybe the arduino itself any suggestions?
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(sensorValue);
delay(1); // delay in between reads for stability
}
I got the same issue, when I tried to connect Arduino and HC-06 Module trough Logic Level Converter (5.5 V to 3.3 V). It's not the baud speed issue. I forgot to wire LV to 3.3 V. In result I got question marks on the serial monitor. I used the scheme from this page: