Comments on: Raspberry Pi Servo Jitter

By: Alex

Alex — Wed, 30 Oct 2024 14:59:28 +0000

This saved the day on my halloween project at the last possible second!

By: ben

ben — Sat, 22 Jun 2024 01:30:36 +0000

In reply to theborg1of4. Thank you :) I'm glad it still helps.

By: theborg1of4

theborg1of4 — Fri, 21 Jun 2024 22:09:43 +0000

In reply to Abhi.

Most servos have mechanical stops to limit their rotation (for example, the HS-322HD I am currently using has around 190 degrees of rotation. You can either buy continuous rotation servos or in some cases hack an existing one; I have cut off the mechanical stop on various Hitec servos, then you can basically have them spin in either direction. Try googling for it (for example https://www.google.com/search?q=continuous+rotation+servo+hack&oq=continuous+rotation+servo+hack&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIKCAEQABiABBiiBDIKCAIQABiABBiiBDIKCAMQABiABBiiBNIBCDU4NjNqMGoxqAIAsAIB&sourceid=chrome&ie=UTF-8), there are tons of examples

By: theborg1of4

theborg1of4 — Fri, 21 Jun 2024 21:56:58 +0000

I know it’s been over four years since you posted this, but I wanted to reach out anyway: this is a nice, simple example that answers a lot of questions I had regarding servos and jitter on a Raspi Zero W. And it’s one of the first bits of pigpio code that actually works. Thank you!

By: ben

ben — Thu, 04 Jan 2024 18:34:38 +0000

In reply to Abhi. I believe not all servos are rated for 360 motion, so you want to make sure you get one of those first. Then it'll likely be that you need to make sure you hit intermediary steps in your code to describe a full rotation to ensure that the servo rotates and doesn't just take the shortest path to a destination. I'm not sure what doubling servos would achieve, there are many ways to skin that cat :).

By: Abhi

Abhi — Thu, 04 Jan 2024 18:14:01 +0000

Thank you for this post! I was just wondering if there are any ways to make these servos rotate in a 360 degree motion? I am trying to unwind a string in a door opening mechanism for a mousetrap, and I was trying to attach the string to the blade of the servo. If this is not possible to make it do a 360 degree motion, would you recommend that I use two servos to increase the amount of string I can unwind?

By: Sam Malone

Sam Malone — Wed, 27 Dec 2023 19:17:03 +0000

The only thing that worked after 3 days of searching and experimenting, appreciate it!

By: whc2818

whc2818 — Sat, 18 Nov 2023 10:28:23 +0000

Thanks a lot. I never though gpio library is software based even raspberry pi supports hardware pwm. I have wrongly blamed the hardware for the shaking problem

By: Totos

Totos — Thu, 20 Jul 2023 06:39:19 +0000

Thank you a lot. Little note: you can remove ‘import RPi.GPIO as GPIO’ in the pigpio version.

By: Jorge O Hernandez

Jorge O Hernandez — Wed, 16 Nov 2022 18:36:07 +0000

This is awesome, that servo jitter was driving me crazy. Thank you so much for sharing!

By: lab rpi

lab rpi — Thu, 22 Sep 2022 12:18:15 +0000

ah briliant! thank you!

By: gildo

gildo — Sun, 31 Jul 2022 17:12:23 +0000

freaking awesome!!

By: Matt

Matt — Wed, 08 Dec 2021 21:37:10 +0000

brillant!

By: Sajeewa Pemasinghe

Sajeewa Pemasinghe — Mon, 01 Nov 2021 20:12:32 +0000

This is just brilliant!! Thank you so much for sharing!! I spent so many hours thinking of all sorts of reasons, that could have resulted in this super jitter. Now everything is so smooth thanks to you!!

By: pseudokool

pseudokool — Sat, 24 Jul 2021 18:55:23 +0000

protip!

By: ben

ben — Mon, 21 Jun 2021 01:03:44 +0000

In reply to Arif Kamal.

It’s not the time you want to change, it’s the frequency set on this line: “pwm = GPIO.PWM( servo, 50 )” and the duty cycle set on this line: “pwm = GPIO.PWM( servo, 50 )”

They’ll be specific to your model, and I’m sure it’s documented in the manual or specs.

By: Arif Kamal

Arif Kamal — Sun, 20 Jun 2021 18:42:19 +0000

hi, i tried using PIGPIO on MG995 servo but it doesn’t go the angle like in the coding. it moves more than 360 degree angle even if i decrease the time in sleep. Can you help me?

By: cipri

cipri — Sun, 21 Feb 2021 20:48:55 +0000

much apreciated.thats the solution

By: Jim A

Jim A — Tue, 15 Dec 2020 15:15:32 +0000

Thanks. I tested on my RPi3B+ and SG90 servos. PIGPIO is a much better solution than just turning the servo off after each positioning.

By: Jhonny B

Jhonny B — Sat, 24 Oct 2020 22:17:55 +0000

Thanks a lot ^^

By: y

Thu, 24 Sep 2020 23:25:08 +0000

mad my life so much easier.
thanks!

By: ben

ben — Tue, 07 Jul 2020 01:41:56 +0000

In reply to Cassio. Thank you for dropping a note :) it's always nice to know these posts help others. Take care.

By: Cassio

Cassio — Mon, 06 Jul 2020 07:17:15 +0000

it works!!
thank you very much!