Raspberry Pi Pico: Inputs & Servo Control

День тому

Raspberry Pi Pico MicroPython tutorial using a switch, a potentiometer, some LEDs, and an SG90 servo. This video is a direct continuation of my earlier Pi Pico episode: • Raspberry Pi Pico
All of the code and wiring diagrams included in this video can be accessed from: www.explainingcomputers.com/p...
You may also be interested in my other project videos, such as the Raspberry Pi Anemometer: • Raspberry Pi Anemomete...
More videos on SBCs and wider computing and related topics can be found at:
/ explainingcomputers
You may also like my ExplainingTheFuture channel at: / explainingthefuture
Chapters:
00:00 Introduction
00:42 Back in Action (recap)
04:15 Switched On (using switches)
07:20 Great Potential (potentiometer)
10:19 Servo Control
13:54 Servo & Pot
16:33 The Future
#PiPico #RaspberryPi #Servo #ExplainingComputers

КОМЕНТАРІ: 434

@Ratchet_effect 3 роки тому

Ah Chris the Pico has a lot of potential for young ones & us older humans. I like how you mix the practical/coding into an episode & make it enjoyable for all ages.

@dang48 Рік тому

Exactly. These videos have been a big help in my classes and I'm still tinkering with my Pi and the Tiny2040 (little cousin to the Pico).

@laurieinjapan 2 роки тому

I spotted a Raspberry Pi pico at my local electronics shop. I'm going to use one to make a puzzle box. Thank you for your excellent explanation.

@PS_Tube 3 роки тому

Pi Pico in action with our old friend servo from the hamster feeder... Another amazing EC Sunday !

@chrismorgan441 3 роки тому

Another great video for those of us who are not truly computer savvy. You make the coding seem so simple and enjoyable. This inspires me to tear down old electronics, raid the parts store of its switch inventory, pull out a soldering iron, and buy a herd of Picos for the different joints of a few intended puppeteering projects. Nice work. Thanks!

@perrymcclusky4695 3 роки тому

The Raspberry Pi Pico is more interesting then I first thought. Looking forward to your next video!

@ExplainingComputers 3 роки тому

Hi Perry, there is a lot of potential in this tiny and low-cost little Pi.

@hidden_vault 3 роки тому

There so cheap and affordable which makes them very worthy too

@fred.chapman 2 роки тому

Very nicely done, Chris! I like how you explain both hardware and software so we get a complete understanding of the whole system. Enabling the internal pull-down resister for the open switch is a particularly nice touch! Managing the LED pin assignments with a list simplifies the `while` loop in your Python code dramatically.

@paullandry6573 3 роки тому

17 minutes has gone by in a flash an I still want more! Thank you for another fun and educational video (as always)

@syaduinotech3681 7 місяців тому

😮😮

@thoughtful_criticiser 3 роки тому

Simple and clear, makes programming accessible to everyone. Brilliant channel.

@edwardjoyner9344 3 роки тому

Chris I'm so happy you did this video. I think you're the only person I know who has done a demo without just flashing the LED. My mind immediately went to, how supplement the code to stop the jittering...😊...I was totally enthralled. Maybe round the value before passing it to the servo. 😉 Love the videos as always.

@pixadordelterrat2725 3 роки тому

Zebras and giraffes, virtual puppeteering... This video is both hilarious and educational at the same time. I can't believe it's 17 minutes long, it felt so short!

@snoopstp4189 3 роки тому

Chris only has 3/4 of a million subs, his channel is basically the best kept secret on the interwebs.

@iHawke 3 роки тому

Coincidentally enough, this is something I have been looking for a while now

@paulmilligan3007 3 роки тому

Excellent work. Pixador’s comment had me fast forwarding to spot the Zebra! Anyway you showed all the basics of input and output - both digital and analog(ue). My Pico starter kit arrived on Friday so tomorrow I’m off to the shed. It was also useful showing how you connect up to the Pi 400 as it helps to get started.

@lesliedeana5142 3 роки тому

I've been waiting for this. I've bought 2 already!

@ExplainingComputers 3 роки тому

I think Pi Picos are kind of an addiction!

@EcoHamletsUK 3 роки тому

I've got 7 so far! Plus a couple of Pimoroni Tiny 2040. Along with loads of Arduino Unos, Nanos, Megas and Pro Minis, and a few ESP32s, ESP8266s and Seeeduino Xaios. Buying one microcontroller is the start of a very slippery slope!!!!

@NewAgeDIY 3 роки тому

Hi Chris, how’s thing in the UK? Today’s video is going to be a hit for the new programmers of all ages. Easy to follow instructions , and good project ideas. Time for me to head over to my work bench and get started. See you next weekend.

@dang48 Рік тому

Great video as always Chris. Thank you. I'm currently working with the Pico's little cousin, the Tiny 2040 and am trying out the coding that you explained in this video. I played around with it as well and had some fun with it. Didn't have a servo motor handy but that's okay. Will be getting one at a later time. Thanks for these videos. They're a great help and hoping you get a Tiny2040 for future videos.

@nathanisip 3 роки тому

Brilliant introduction to micropython and programming with the Pico! Really excited for my Picos to arrive in a few weeks, it’s a far cry from my assembly code days with the 8051.

@TradieTrev 3 роки тому

MicroPython is awesome! It brings back the ease of coding similar to the likes of Basic with an interaction of the real world!

@simonbeasley989 3 роки тому

Informative and very well timed, I'm learning and experimenting at the moment with controlling a matrix of LEDs with the ultimate aim of making a unique animated clock. You gave some handy programming tips, especially controlling i/o from an array.

@chriholt 3 роки тому

The Pico looks like it's so much fun. I look forward to it making another appearance in the future!

@antoniuskelvinkurniawan 3 роки тому

I like how you programmed the raspberry pi pico on a raspberry pi 400. Free from x86 system!

@hidden_vault 3 роки тому

This series is awesome I'm glad other ppl are loving it too. thankyou much blessings.

@SirSurreal 7 місяців тому

Great video, a lot happing for such few lines of code. I'm new to the Pico so I've binged a lot of videos on the Pico! One problem I had with the SG90 was it going beyond the 180 degree mark which resulted in it shaking and heating up. After adding and displaying the 'value' variable to make it visible in the shell, I could find the value that took the servo beyond the 180 and created an if statement to limit the range of the value. It did work, although there was a region of the pot that didn't work. Will study PWM and Duty cycle for a deeper understanding of the code.

@BryanBenoit 3 роки тому

Nice video explaining what we can do with those Raspberry Pi Picos and some Python code. Thanks Mr Barnatt !

@erikdekoster4137 3 роки тому

Thanks again Chris, always looking forward to your videos, very informative and useful information brought to us in the usual colourful manner we like.

@Techmagus76 3 роки тому

What i liked the most are the sounds that supports the visual effects of the LEDs after pressing the switch, even if my limited python abilities prevented me from identifying it in the code base.

@HKey_Root 3 роки тому

Smashing. I particularly like the pot controlling the servo, to turn a tuning capacitor in a magnetic loop antenna.

@WPGinfo 3 роки тому

Very educational! Nice change to the usual SBC-stuff! This stuff encourages me to learn & experiment a bit with the pico and RPi sbc's. Keep up the good work! Regards, Willem

@PeteVanDemark 3 роки тому

Very well done. This is my favorite EC video of 2021-so far! My RP Pico order just arrived and I can’t wait to try these myself! Bravo!

@ExplainingComputers 3 роки тому

Sounds like you have some experimenting to do! :) Good luck with it.

@PeteVanDemark 3 роки тому

@@ExplainingComputers Definitely! Thanks!

@Hulker69 3 роки тому

Great video Chris, as always. I now use CircuitPython on any microcontroller that supports it. I moved away from raw MicroPython except on something like an ESP32 that doesn't support CircuitPython. On the Raspberry Pi RP2040 chip boards there is a great PIOASM assembler that can run out of the box via CircuitPython. The latest version of Thonny does a very good job using MicroPython and CircuitPython boards.

@georgenadar9977 2 роки тому

pls make more of such videos on raspberry pi pico.. All the videos from your channel are awesome

@rogerkoh1979 3 роки тому

Another nice video. Great to show basic control to people. Thank you again for sharing.

@timmurphy5541 3 роки тому

Love this. İt's a perfect introduction to the kinds of things one imagines doing with a Pico. I did a show and tell video last week at work about the Pico but I should just have played this :)

@MicroProjects 3 роки тому

This is the thing that i have been looking for a while

@richardneifeld7797 Рік тому

Another option that ***might*** reduce the jitter is to heat, or cool, or change the relative humidity, near the Pot. The jitter is presumably caused by intermittent connection to various windings in the Pot. Temperature change will affect the relative dimensions, through thermal expansion, and humidity affects accumulation of static charge on insulating surfaces near the contact regions. Great video!

@retireeelectronics2649 2 роки тому

Nice Video, picked up a couple picos and now waiting for a few rainy days to play with these

@computerchaot9891 3 роки тому

I would love to see some experiments with FreeRTOS and the Pi Pico

@pezictusfish 3 роки тому

Thank you for making Sundays fun again!

@johndeluca230 2 роки тому

Thanks for your videos. I have enjoyed them for a while. Vintage pot and vintage breadboard (like many I own) with a dignified aged cream color from the original white.

@spikekent 3 роки тому

Thanks Chris. Looking forward to PiPico projects.

@marcsmithsonian9773 3 роки тому

Good job! You just demonstrated common problem with potentiometers... they decay with age and add noise but even new ones do that. Thats why audiophile way is to replace it with ladder resistor switch.. but for your project all you need is a small capacitor in paralell across potentiometer mid and side pin and current limiting resistor in series to the gpio pin.. that would remove high frequency noise.

@AFCAWorldBodybuildingArchive 3 роки тому

The magic of film making is so powerful, I am in awe 😍

@almosh3271 3 роки тому

your explnations are so clear and right to the point, even with your accent. Two thumbs up I just subscribed .

@ExplainingComputers 3 роки тому

Thanks, and welcome aboard!

@GizmoFromPizmo 3 роки тому

Back in the 1990s, when I worked for an industrial controls company, I learned about servos and something called a "dead zone". Programming in a Dead Zone eliminates jitter. So it really has nothing to do with your potentiometer, instead, it is the nature of servos. It's amazing to me to see you using $200 worth of hardware that can replace a Programmable Logic Controller (PLC), that back in the '90s, cost tens of thousands of dollars.

@wayland7150 Рік тому

Those PLCs were a bit of a rip off. They were just 8 bit micro controllers with some inputs and outputs and a simplified programming language. Late '80's through the '90's we would do the same thing with a Z80 and some code written in C. The advantage of a PLC was the electrician could program it.

@GizmoFromPizmo Рік тому

@@wayland7150 - Ladder Logic was cryptic as heck. PLCs were a rip off but well worth it to the companies who needed such a thing.

@loginregional 3 роки тому

I hope Mr Scissors and Stanley are fine and aren't jealous of Pico & Servo (the dynamic duo)

@ExplainingComputers 3 роки тому

They are doing OK -- and will return! :)

@MicrobyteAlan 3 роки тому

More information for my garden railroad. Interesting and well presented, Thanks

@Reziac 3 роки тому

Ooooh. I like that idea!!

@MarcelHuguenin Рік тому

Great video, very concise explanation, great reference. I love the Pico!

@Kw1161 3 роки тому

As always another great video, and thanks for the information. It sure beats working on the servos on my old US Navy ship.😀

@compuzeme 3 роки тому

Another amazing video Chris. Thank you and keep up the great work!!

@valomestari 2 роки тому

This was exactly what I was looking for! Thank you, sir!

@nutsnproud6932 3 роки тому

Thanks Chris. Good old school carbon potentiometers. They give free snap crackle on pop on my old valve (tube) wireless.

@Vincent_Serpico Рік тому

Chris great tutorial! Just what I needed to help me get the basics down so I can complete a project that I have been working on. Once again, Thank you!!!!

@ExplainingComputers Рік тому

Good luck with your project. :)

@perseus25xd 3 роки тому

Thank you sir! I was eagerly waiting for more pico related content!

@ExplainingComputers 3 роки тому

More to come!

@fram1111 3 роки тому

Like your programing details, you would be a good teacher!

@shamroc34 3 роки тому

I love your videos. So clearly explained.

@HoboVibingToMusic 3 роки тому

I'm getting a Pi3B+ Soon, so I can tinker around with the GPIO ports, gonna watch those GPIO /Pi vids from your channel a lot now!

@PU7MZD 3 роки тому

The dithering can be fixed using a simple closed loop controlling approach. That would be a very good introductory example to Control Theory using the Pico.

@marksterling8286 3 роки тому

I wondered if you did some rounding on the pot results say nearest 10 would take out the dithering but without loosing any accuracy

@adymode 3 роки тому

simple_smoothed_value = simple_smoothed_value * 0.9 + lastest_value * 0.1

@llpBR 3 роки тому

I would try to divide it by 100 and truncate the result.

@neilhughes3823 3 роки тому

@@marksterling8286 losing.......loosing...........we know by now how autocorrect sometimes makes our text somewhat inaccurate, so it is worth checking before posting. You may be very experienced in giving commands to computers , so will appreciate accuracy in coding.

@robertbox5399 2 роки тому

You should always place a small (10nF) capacitor on ADC inputs to micros to give something to charge up and dominate the internal sample and hold circuit capacitance. What you get is the result seen here if you don't.

@srtcsb 3 роки тому

Explaining Computers... Now complete with lights, sound effects, lions, tigers and giraffes, oh my! :-) Really good fun Chris, and great code and hardware hook up examples too. Thanks for another great video.

@ExplainingComputers 3 роки тому

Hi Steve. :)

@carlosquijano1461 2 роки тому

Very good professor. I enjoyed this so much. I like the comments and explanations of the code along with the diagrams. Superb

@ExplainingComputers 2 роки тому

Many thanks!

@mcconkeyb 3 роки тому

Good stuff. Reminds me of learning electronics back in the 1980's. The devices were bigger and a lot less integrated, but with a couple of dozen chips we could do the same thing. :-)

@prvashisht 3 роки тому

I had a pico and servo lying around. Was thinking to use an ESP32 for the motors but this is great. Thanks for the video :D

@proterotype 3 роки тому

Another gem of a video, sir. Keep em comin

@alexhudspeth1213 3 роки тому

This could headline a "demystifying servos" playlist! Also, mad props for the efficient code: I'm about to jump ship from the HMS C++ to the HMS Python. Thanks for another great video!

@BeefIngot 3 роки тому

It would be a very short playlist unless you started getting into more complex servos like ones with higher accuracy, force feedback etc.

@NoahNobody 3 роки тому

Great tutorial. I just ordered a few of these. I'm looking to do things with BLE or LoRa.

@ShadowzGSD 3 роки тому

No biscuits today but at least i have coffee to watch the video of the week. ☕

@neutron-au 2 роки тому

For the Servo jittering issue, easiest fix would just be to round to nearest 100, you can clearly see in the video that the jittery-ness of the values only fluctuates 100 values or so. Edit, The jittering output would make a pretty cool random string generator: sha256 the string of input^input.

@PeterJasper 3 роки тому

Great video on the Pi Pico... love the code and applications. Your old wire wound potentiometer is potentially causing the jitter in values... maybe time for a potential upgrade.

@Colin_Ames 3 роки тому

Very interesting and educational, as always.

@EcoHamletsUK 3 роки тому

Picos are an ideal companion to a Pi computer, as they are much better at connecting to physical devices than the GPIO on a Pi is. My current project uses a Pi 3B with a touch screen for controlling a Pico that will have a motor driver, servos and a stepper motor attached. I'll probably use I2C for communication, but haven't got that far yet. The Pi will give me remote control through Wi-Fi, Ethernet or Bluetooth, including the potential to stream video so I can see what I'm controlling remotely!

@bobpaugh6725 3 роки тому

Another fantastic video Sir thank you very much.

@JediBuddhist 3 роки тому

Hahahaaa.. Zebras & Giraffes.. you're mad as a box of frogs 😄👌 That's why your content is complete Gold-Dust. For me and the kids I work with. Got our Picos 2day. Thanks a million Christopher 🙏✨

@tonyross2947 2 роки тому

Awesome, Chris...awesome. Thank you so much for this video.

@bsvenss2 3 роки тому

It was nice to finally meet Mr. Pot.

@johnweller5491 3 роки тому

As always absolutely excellent!! Many thanks.

@zetaconvex1987 2 роки тому

A welcome return of both the Pico and Blu Tack. BTW, I don't think the age of the pot is the problem. ADCs in general are a bit jittery. Put a 10uF capacitor between the wiper and ground. That should smooth things out a lot better.

@dang48 Рік тому

Like de-bouncing a push button. That can be done either with the capacitor as you mentioned, or in the coding.

@onjofilms Рік тому

A capacitor correcting the problem points to jittering voltage from the potentiometer, not the ADC.

@wayland7150 Рік тому

@@dang48 If the capacitor solves the problem then it's less work for the software.

@wayland7150 Рік тому

@@onjofilms It's the nature of the real world, there is noise. The only reason there is not noise inside computers is the efforts taken to design it out or at least design out the effects.

@dang48 Рік тому

@@wayland7150 That is true. The reason for debouncing in the coding would be to save physical space on your circuit board. Both methods have their advantages and disadvantages.

@lorenzo.c 3 роки тому

High quality video, as you always do. The feature I find most interesting (and innovative) is the PIO, the set of state machine which can emulate peripherals (or make new ones). I hope you are looking at exploring the PIO. Do you know whether there is a compiler from C/C++ to the assembly language of the PIO?

@horseradishpower9947 3 роки тому

This was interesting. Thanks for the video.

@jbm11235 3 роки тому

It might be too much for UKposts but, I'd love to see an explanation of a Pico (ideally a pair or n of them) hosting finite state machines interacting with a state machine on a host computer. In addition to or alternatively, having the Pico report state (ie. location, temp or the output of an "instrument") would be awesome. Really enjoy your series as do my son and grandson.

@TheSemtexCow 3 роки тому

Thanks Chris, love the videos on the pico. It’s fired up my interest in microcontroller projects again 👍. You did inputs and now outputs, what’s next?

@brooknet 3 роки тому

Very clearly explained - useful. To fix the jittering pot, could you average-out the readings? For example, read 5 readings into an array, add them together, divide by 5. It'd make things a little more complicated, though - perhaps better to just replace the pot - although as other comments have mentioned, the varying readings could be in the ADC, and not the pot.

@yuhani123 3 роки тому

Thanks you sir for your excellent tutorial

@gregholloway2656 3 роки тому

Brilliant video, Chris. I’ve been programming on the Pico since February. I like the simplicity of Micro Python, but I’ve been using the C SDK for maximum speed.

@sharonwolff1 3 роки тому

So for some that has used both, what's the speed difference?

@sharonwolff1 3 роки тому

Bad typing - "some" was supposed to be "someone".

@rohandesigns 3 роки тому

Beautifully explained sir... i have seen some of your tutorials and they are well explained. I have subscribed your channel. Teach us more..😊👍🏻👍🏻

@FamilyGrob Рік тому

Thanks! Fantastic explanation and demonstration!

@ExplainingComputers Рік тому

Thanks for your support, most appreciated.

@EZ_shop 3 роки тому

Nice video. Love micro controllers.

@marksterling8286 3 роки тому

Really great video Chris, i have been trying to teach my son about pulse modulation but I failed to get his attention, today he sat down and watched you video and now we are breaking out the pi zero wh connected to a breadboard and a couple of servos, he is trying different code as I type this. I have not got a pico yet preferring to ssh onto the zero. We both wondered with the earlier powering a pi from a 12v lead acid battery and today having analogue inputs and servos. Perhaps an explaining computers, robot or weather monitoring station would be a nice combination of the two episodes.

@ExplainingComputers 3 роки тому

Thanks for this. I have a video on using servos with a standard Pi here: ukposts.info/have/v-deo/sHh1iGp6rqCGsnk.html I also did two videos on a weather station using a Pi earlier this year, first one here: ukposts.info/have/v-deo/e5iCpHppnql0k2Q.html -- and second (where I build an anemometer) here: ukposts.info/have/v-deo/aXyBeYaRZ2he1Ww.html But there will be more projects . . .

@NickCornaglia 2 роки тому

Your sense of humor kills me!!!

@TheZolon 3 роки тому

This is awesome. Now I just need to figure out how to use an SBUS RX with the Pico , and use an PCA9685 for the servos which will allow me to finish a couple projects I have wanted to do.

@kaistutz7067 3 роки тому

Nice! You can clearly see that the potentiometer is of the logarithmic type ;)

@rv6amark 3 роки тому

Nice tutorial! I've done this type of thing in "C" using an Arduino, but I've never used Python, and have always wondered if it would be easier. This gave me a nice comparison of the two languages. Very nice, thank you.

@skf957 3 роки тому

I have a project on the go to connect multiple Picos using the RFM69HCW radios (not the LoRa variants). The libraries for these radios are only available in C (they be available in CircuitPython but I believe CP doesn't support interupts, which my project needs), so I went down the C++ route a couple of months ago using the Pico SDK and Visual Studio Code. It was an absolute nightmare to setup and get working on W10 (UKposts was my friend here), and is pretty cumbersome to use. In the last month or so RP2040 support became available on the Arduino IDE which I have briefly used just to test that it works. If the radio libraries were available to Micro Python I'd use that in a heartbeat. So much easier to use, and TBH I wouldn't miss the greater (much greater) efficiency of C++ on this project.

@lesliedeana5142 3 роки тому

@@skf957 The advantage of C is speed of execution. C is *compiled* whereas Python is *interpreted.

@skf957 3 роки тому

@@lesliedeana5142 Yes, thanks. And I like what I’ve seen of C++. Its relative inaccessibility (on the Pico at least) appeals to my inner geek/snob, it seems to be extremely feature-rich, and as you say, is fast in execution. But, and I am no expert here, Python and Micro Python, far from being the modern day equivalent of BASIC (and that wasn’t THAT bad), are also feature-rich and really nice languages to use.

@fredtaylor4548 2 роки тому

Another great lesson, thanks!

@spillanemike 3 роки тому

Great video as always, thanks Chris

@ExplainingComputers 3 роки тому

Thanks 👍

@glennsgrainger 3 роки тому

Your a great teacher. Very cool

@wansh013 3 роки тому

Awesome, loved it 👍🏻👍🏻👍🏻👍🏻👍🏻 A few more please 🙏🏻

@wanyman 2 роки тому

Brilliant video. Thanks!

@typxxilps Рік тому

can not wait to see you with an update about the Pico W and its possibility accessing data from the lan or cloud like homeassistant. Usefull for showing the energy production of a solar power modul / generator live in Watts, kWh today, this week, month and year. e-Ink would be a nice solution too, also a forecast of the clouds / sun for the next 90 minuts a usual dish washer or washing machine or dryer does need to run on solar power. It is just an indicator using less power on an e-ink and is always useable for everyone in the household instead of using the phone and app you need to start or even log in. Just looking at an e-ink while you go buy is a lot better than the app overhead we usually see nowadays.

@SomeOne-rh5so 3 роки тому

Very very nice - I feel jealous, that already not young, It's so helpful for all who likes electronic. PS Chris - you are ready to make your own HVAC DDC for your home.