#raspberry pico

[scum-cat]

first tune for the music box

starting to write tunes for the music box, the notes are kind of dependant on the rotation speed right now,. if you rotate at full speed you get a consistent melody

[sickacademia]

STEM Diaries | 21.03.2024

- I had to go to college to finish my report and I still didn't finish it because I spend too much time hanging out with my friends and colleagues (lmao)

- My raspberry pi pico arrived!! I tried basic things such as blinking an LED, which took me over an hour to happen (lmao)

- I had to keep working on the report after dinner but I was hit with intense period cramps that paralyzed me so I couldn't finish it. again. (lmao)

[tingvall]

Working on a Raspberry Pico W display to showcase what is currently playing on Plex. Fun project with both Python and Micropython in the stack.

Now all that remains is getting buttons to work and hardening against network failures.

[rx75-2]

LED control system in progress!!!

[trainsinanime]

PSA

If you want to use a Raspberry Pi Pico as a debug probe to program another Raspberry Pi Pico without the annoying BOOTSEL dance, make sure that when you run CMake on the debugprobe firmware (in the picoprobe repository), you pass DEBUG_ON_PICO=ON as option. As in,

cmake -DDEBUG_ON_PICO=ON ..

This flag is described in the Readme of that repository (also note that the repository and tool have been renamed debugprobe from picoprobe), but it's notably missing from Appendix A of the Getting started with Raspberry Pi Pico guide. That guide is probably older, before the firmware was split and renamed like that, and nobody has bothered to update it yet.

If you don't do that, the firmware will expect the SWDIO and SWCLK data on different pins than what the instructions say, and you will find yourself spending hours checking the cable connections because you keep getting "Error: Failed to connect multidrop rp2040.dap0" errors in openocd. Ask me how I know.

(Also, fuck Raspberry Pi for making so much of their otherwise really good documentation PDFs. There are several places where you need to cross-reference things, and if it were HTML, the navigation between the sections would be so much easier.)

Other tip, while we're here: Install ninja (with brew install or apt install), then when doing the cmake generating step, pass "-G Ninja" in addition. Then build by just typing "ninja" instead of "make -j4" or whatever. It's a little extra typing but it is faster and better at utilising many cores on your host computer.

[a-shard-of-ace]

pi pico website?

Say, I was just thinking—we’re all mad about the 4–7 big websites having taken away our internet. If we wanted to make it more accessible to host a website from actual scratch, then how accessible (& how cheap) could we make it?

So uhh. This might be insane but to my fellow technically-minded individuals: you all think you could host a micro-website on a Raspberry Pi Pico W?

I know it doesn’t have any power at all but what if you don’t get a lot of traffic either? I honestly have no idea how that works out.

Anyway I’m ordering one now! Very curious if I can host a microblog with €8 of hardware.

[spamhamandeggs]

Project isn't working

Connect oscilloscope to check if it's generating the signal you expect

See a signal that makes absolutely no sense

Now you're even more confused than before

[sb-components]

The Ultimate Pocket Computer For Innovators, Coders, Hackers

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[drdnar]

A Color LCD (part 1)

Many years ago, I pulled an LCD out of a GPS unit from the days before cars and smartphones having navigation features. This LCD is a color LCD with a backlight. It’s a very different technology, and much more challenging to interface to. I can’t even find a proper datasheet for the module.

There are datasheets available for modules with similar part numbers. Based on the circuitry in the above picture, this looks like the closest pinout:

B&W LCD modules usually have a built-in charge pump to generate their needed voltages. Unfortunately, the datasheet also says this module needs those voltages supplied externally, and they’re a bit weird.

VDH: +8.3–+8.7 V @ 3.3 mA

VGH: +16.2–+17.0 V @ 0.23 mA

VGL: −8.35–−8.0 V @ 0.17 mA

VCC: +2.5–+3.3 V @ 0.22 mA (this is actually a normal voltage)

Fortunately, I don’t have to design and build a boost circuit myself; you can Just Buy voltage boost modules easily from many places. Getting a module to generate that negative voltage, however, is a lot harder. But it turns out that charge pump chips are A Thing you can Just Buy on Digikey. Sadly, charge pump chips tend to have fairly low output current capability, so while charge pumps could produce the high voltage for the backlight, it would require several and be kind of awkward.

So last week and this week, I finally sat down and learned enough about PIO on the Pi Pico to produce suitable timing signals for the module.

Great! I have a power circuit, I have logic signals, I have a suitable connector, now to see if I can display a picture. Well, one problem: I haven’t built something to hold the LCD. I don’t have a 3D printer, nor any CAD skills, so tonight’s project is to design in Adobe Illustrator a case for the module made of cardstock.

[femgineerasolution]

Finally had chance to do some soldering today, tried to make a video of it but the camera cut off without me realising 😅

Looking good for me to start using them now though!

[mynewchapterinlife]

Home Automation 家居自動化

[drgeppo]

👀👀👀👀

[ctommy-chileno]

I have the power to make a music box with Butch 4 Butch as the song but I lack some resources and a gf

[rx75-2]

The programming and wiring is finished!!

Now I just have to make a box

[adafruit]

Circuit Playground 32u4 Tester is pico-ified!

With many chips finally coming back into stock, we're doing a run of some boards we  haven't manufactured in quite a bit! for example this Circuit Playground Classic, our original Circuit Playground board, is based on the ATmega32u4. since its been a few years we pulled out the tester kit and noticed that only one of the three testers was working. the tester was originally designed to use an Arduino M0 Pro which was a SAMD21 board with a second USB serial port for programming & debug. but...that board is discontinued! so we might as well 'pico-ify' it by converting the tester to use our RP2040 Tester Brains which is combined with our standalone AVR Programming library to perform all the firmware burning, USB enumeration, and testing.