FEZ Mini - Servo Driver Struggle

Archive
1

I am really struggling in getting my FEZ Mini to control a Servo. I am sure my code is correct and that I have things wired correctly.

Servo is connected to a 5V 1Amp supply
Di9 is connected to the Servo Signal

Servo supply and FEZ share a common ground

This is my Test Code:

PWM servo = new PWM((PWM.Pin)FEZ_Pin.PWM.Di9);
while (true)
{
servo.SetPulse(20000000, 1250 * 1000); // 0 degrees. 20ms period and 1.25ms high pulse
Thread.Sleep(1000);//wait for a second
servo.SetPulse(20000000, 1500 * 1000); // 90 degrees. 20ms period and 1.50ms high pulse
Thread.Sleep(1000);//wait for a second
servo.SetPulse(20000000, 1750 * 1000); // 180 degrees. 20ms period and 1.75ms high pulse
}

When I depoy and run this the Servo does not move. If I connect an LED to the signal the LED pulses dimmly as the PWM wave changes. I have verified that the 5V supply is getting to the Servo. I have also tried another Servo and another FEZ Mini.

Also for good measure I tried a level shifter to increase the PWM signal from 3.3V to 5V. Still no joy.

I am out of ideas, can anyone who has had sucess in this area give me a few pointers, thanks.

2

What kind of Servos are you using. The most common ones like parallax servos requires 6V

3

I got it working!

I had two issues:

  1. I had a bad supply connection to the servo. I had a bad solder joint that looked I OK…
  2. My 1A 5V power supply was insuffiecent to drive my large Servo, once I fixed the solder joint I could hear the Servo making noises but no movement. I connect the Servo to a 4.5 battery pack and it sprung into life.

Cool I am happy.

4

You need at least another thread.sleep in there too, otherwise you may as well drop off the “180” degree setting because your code will bounce straight back to 0 degrees.

So you have two power supplies? Can you confirm you have GNDs hooked together so that you don’t have two different “ground reference” voltages?

Edit: I see you sorted it. Nice one.

5

Excuse me, I’m using FEZ Panda II and now I was problem, please everyone tell me.
I’m following this solution

*** my problem is cannot start debugging code C# in FEZ Panda II, Moreover LED status is not flashing when debug.

Help me pls, thank you

6

Hi Pattharapong S, welcome to the forum.
You should start your own thread as this is now “archive” and 2 years old.

7

I follow 1st topic and start debugging completed, However 2 weeks later I cannot start debug. I don’t know about this problem. Can you told me for fix that?

8

start your own thread on the forum.