Braccio: servo 2 and 3 not working

Other Hardware Robotics
1

Hello everyone, I just bought a Braccio kit, assambled and tried it with the example testBraccio90 but the shoulder and elbow do not move. It's like they do not have power either because if I remove the movement in the loop the other servos remain in position, while 2 an 3 (shoulder and elbow) can be moved easily. I tried every servo attaching them to connector one in a loop movement and they all move just fine, it's like the board arrived with the Braccio is faulty. Any suggestion?
Thank you very much for your time.
Fabio.

2

Have you tried running the Servo library sweep sketch on those servos by themselves? Did they work?

Something like this (untested):

#include <Servo.h>

Servo shoulder;
Servo elbow;

void setup()
{
   Serial.begin(115200);
   shoulder.attach(10);
   elbow.attach(9);
}

void loop()
{
   for (pos = 30; pos <= 120; pos += 1)   // goes from 0 degrees to 180 degrees
   {
      // in steps of 1 degree
      shoulder.write(pos); // tell servo to go to position in variable 'pos'
      elbow.write(pos);
      delay(15);  // waits 15 ms for the servo to reach the position
   }
   
   for (pos = 120; pos >= 30; pos -= 1)   // goes from 180 degrees to 0 degrees
   {
      shoulder.write(pos);  // tell servo to go to position in variable 'pos'
      elbow.write(pos);
      delay(15);   // waits 15 ms for the servo to reach the position
   }
}
3

Thank you. Nothing changed, nothing moved. Either my arduino Uno is faulty or the servo board is apparently. I ordered a new Arduino Uno board just to be sure.

4

I am unfamiliar with that arm. Can you move the connectors from the shoulder and elbow servos connectors to 2 different pins that you know work and try the sweep using those pin numbers? That would tell you if it the servo or the pin.

5

Ok, It was my arduino board's fault. Apparently pin 9 and 10 are not working. I bought a new arduino uno board and the program is working just fine. Thank you for your help.