Control Servo to Specific Angles

[bradocchs]

Hello,

I'm trying to control a servo to specific angles, but I'm having trouble figuring out how. Is there any example code on how to move a servo to a specific angle and then hold that position?

I've tried different things with both servoWrite and pwmWrite with no luck.

Thanks!!

Brad

[fivdi]

The angle will have to be converted to microseconds with code something like this:

let angle = 45;
let min = 1000; // microsecond value for fully counter-clockwise
let max = 2000; // microsecond value for fully clockwise
let microseconds = (min + (angle / 180) * (max - min));

pin.servoWrite(microseconds);

[fivdi]

I think the required information has been provided so I'll go ahead and close this issue.

[bradocchs]

When I do this it just spins CW or CCW (depending on microsecond value) until the next command or end of program. I've tried with and without setInterval. I'm using a Parallax continuous rotation servo for testing on GPIO 10 with a RPI 4. I was hoping to be able to rotate 90 degrees and stop. It also seems to coast instead of brake. I may end up using an Arduino which works fine.

[fivdi]

If it's a continuous servo set the angle to 90 degrees (approx. 1500 microseconds) to stop and hold the servo.

[bradocchs]

Quick update: I had to adjust the pot on the continuous to get it to stop and then I ended up switching to a standard servo and everything works great!