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I use a lot Arduino Uno, but in this case, I have some BQ ZUM BT-328 boards, which are based on Arduino BT. The problem with some of BQ ZUM BT-328 boards is that the ultrasonic sensor (HC-SR04) is not working in any pin. However, apparantely, the boards work and the 2 servos (SM-S4306R) work fine too. When I change the ultrasonic sensor to other pins and with other wires, it is not working yet. However, I use that sensor in another different BQ ZUM BT-328 board and it is working fine, and if I add the same setup (2 SM-S4306R) and same code, it continues working fine. Then, the problem is just in some boards, not in everyone.

The ultrasonic example is:

long distance;
long responseTime;

int pinTrig = 9;
int pinEcho = 8;

void setup(){
  Serial.begin(9600);
  pinMode(pinTrig, OUTPUT);
  pinMode(pinEcho, INPUT);
}

void loop(){
  digitalWrite(pinTrig, LOW);
  delayMicroseconds(5);
  
  digitalWrite(pinTrig, HIGH);
  delayMicroseconds(10);
  responseTime = pulseIn(pinEcho, HIGH);
  Serial.println("Tiempo "+ String(responseTime)+" microsegundos");
  
  distance = int(0.01716*responseTime);

  Serial.println("Distancia "+ String(distance)+"cm");
  delay(500);
}

Then, I suppose that those BQ ZUM BT-328 boards have some problem and maybe they are starting to fail. I say this, because the same problem works in some boards and in others fails. In those board in which it fails I checked the correct connection of pins (GND, VCC, digitals), change the pin and the wires without result. However, the servos continue to work fine and I can upload the code to the board. My questions are:

Am I correct and they are failing?

Why they are just failing with that sensor and not the SM-S4306R? I mean, maybe some specific component of the board is failing?

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4
  • the questions are not answerable because your description lacks detail Commented May 2, 2023 at 14:47
  • Which more details do you need? I can add more or test more the board. Just tell me. Commented May 2, 2023 at 16:11
  • 1
    include information about the board, the sensors, the connection diagram and minimal program that shows the failure Commented May 2, 2023 at 16:18
  • I have added a reference to the datasheet of the board, the sensor, and the motor. I have explain better the mistakes, and added the code example. Commented May 3, 2023 at 6:17

1 Answer 1

Reset to default
0

Looks like in your sample code you did not complete the 10us pulse.

  digitalWrite(pinTrig, LOW);
  delayMicroseconds(5);
  
  digitalWrite(pinTrig, HIGH);
  delayMicroseconds(10);
  digitalWrite(pinTrig, LOW); // you missed this

See example.

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1
  • Thank you so much for your answer. I tried in all boards adding that line, but the result is the same. The boards which was failing continue failing. Commented May 9, 2023 at 12:50

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