Hackaday Podcast Episode 287: Raspberry Pi Woes, Blacker Than Black, And Printing With Klipper

September 6, 2024 by Al Williams No comments

Elliot Williams is back from vacation, and he and Al Williams got together to talk about the best Hackaday posts from the last week. Of course, the Raspberry Pi RP2350 problem generated a bit of discussion.

On a lighter note, they saw laser lawn care, rooting WiFi devices, and some very black material made from wood. Need more current-sinking capability from a 555? They talked about that, too, along with a keyboard you use with your feet.

The guys had a lot to say about Klipper, why you might want to move your 3D printer to it, and the FCC’s stance on ham radio antennas in restricted neighborhoods. Oh, and don’t forget to play “What’s that Sound?”

DRM? Who’s got time for that? Download our legally unencumbered MP3.

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I2C For Hackers: Digging Deeper

September 5, 2024 by Arya Voronova 16 Comments

Last time, I gave you an overview of what you get from I2C, basics like addressing, interface speeds, and a breakdown of pullups. Today, let’s continue looking into I2C capabilities and requirements – level shifting, transfer types, and quirks like combined transfers or clock stretching.

Level Shifting

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The Worsening Raspberry Pi RP2350 E9 Erratum Situation

September 4, 2024 by Maya Posch 43 Comments

There’s currently a significant amount of confusion around the full extent of the GPIO hardware issue in the Raspberry Pi RP2350 microcontroller, with [Ian] over at [Dangerous Prototypes] of Bus Pirate fame mentioning that deliveries of the RP2350-based Bus Pirate 5XL and 6 have been put on hold while the issue is further being investigated. Recorded in the MCU’s datasheet as erratum RP2350-E9, it was originally reported as only being related to the use of internal pull-downs, but [Ian] has since demonstrated in the primary issue ticket on GitHub that the same soft latching behavior on GPIO pins occurs also without pull-downs enabled.

Ian from Dangerous Prototypes demonstrating the RP2350-E9 issue in a Bus Pirate prototype without pull-ups.

When we first reported on this hardware bug in the RP2350’s A2 (and likely preceding) stepping there was still a lot of confusion about what this issue meant, but so far we have seen the Bus Pirate delay and projects like [Agustín Gimenez Bernad]’s LogicAnalyzer have opted for taking the RP2350 port out back. There are also indications that the ADC and PIO peripherals are affected by this issue, with workarounds only partially able to circumvent the hardware issue.

In the case of the Bus Pirate a potential workaround is the addition of 4.7 kOhm external pull-downs, but at the cost of 0.7 mA continuous load on the GPIO when pulled high and part of that when pulled low. It’s an ugly hack, but at the very least it might save existing boards. It also shows how serious a bug this is.

Meanwhile there are lively discussions about the issue on the Raspberry Pi forums, both on the E9 erratum as well as the question of when there will be a new stepping. The official statement by Raspberry Pi is still that ‘they are investigating’. Presumably there will be a Bx stepping at some point, but for now it is clear that the RP2350’s A2 stepping is probably best avoided.

A small handheld word game called Batch Craze, where one player tries to get another to guess the word on the screen.

2024 Tiny Games Contest: Batch Craze Is Portable Charades, Kind Of

September 3, 2024 by Kristina Panos No comments

So there’s this commercial electronic game out there called Catch Phrase, which, as the game’s own catch phrase explains, is the game that’s played one word at a time. See, a word comes up on the screen, and you have to get the other person or team to guess what it is using gestures and such before the timer goes off. There are a bunch of rules, like you can’t say a word that rhymes, give the first letter, or the number of syllables.

Well, [ahixson1230] and company got their hands on the After Dark NSFW version but found it lacking in the edginess department. So naturally, [ahixson1230] was inspired to build a better one, with a touch screen in lieu of buttons, and a way for players to suggest words to be added to the list. In this version, a player presses anywhere on the screen to start the game, and a random word or phrase comes up. They act it out, get the other person to guess, and then pass the unit over to continue the fun.

Batch Craze is based on the Cheap Yellow Display, aka the ESP32-2432S028R, and [ahixson1230] highly recommends [witnessmenow]’s excellent resource on the subject. As of this writing, [ahixson1230] is still trying to get the speaker to work, and welcomes any help. Can you assist?

There’s still time to enter the 2024 Tiny Games Contest! You have until Tuesday, September 10th, so head on over to Hackaday.IO and get started!

Supercon 2023: Teaching Robots How To Learn

September 3, 2024 by Lewin Day 2 Comments

Once upon a time, machine learning was an arcane field, the preserve of a precious few researchers holed up in grand academic institutions. Progress was slow, and hard won. Today, however, just about anyone with a computer can dive into these topics and develop their own machine learning systems.

Shawn Hymel has been doing just that, in his work in developer relations and as a broader electronics educator. His current interest is reinforcement learning on a tiny scale. He came down to the 2023 Hackaday Supercon to tell us all about his work.

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The Morse Quest game in semi-darkness to show off the dit-dahing light.

2024 Tiny Games Contest: Morse Quest Goes Where You Do

September 2, 2024 by Kristina Panos 10 Comments

Do you know Morse code already? Or are you maybe trying to learn so you can be an old school ham? Either way, you could have a lot of fun with [felix]’s great little entry into the 2024 Tiny Games Contest — Morse Quest.

This minimalist text-based adventure game is played entirely in Morse code. That is, the story line, all the clues, and the challenges along the way are presented by a blinking LED. In turn, commands like LOOK, TAKE, and INVENTORY are entered with the slim key on the lower right side. A wee potentiometer allows the player to adjust the blink rate of the LED, so it’s fun for all experience levels. Of course, one could always keep a Morse chart handy.

The brains of this operation is an Arduino Nano, and there’s really not much more to the BOM than that. It runs on a 9 V, so theoretically it could be taken anywhere you want to escape reality for a while. Be sure to check out the demo video after the break.

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Hackaday Links: September 1, 2024

September 1, 2024 by Dan Maloney 21 Comments

Why is it always a helium leak? It seems whenever there’s a scrubbed launch or a narrowly averted disaster, space exploration just can’t get past the problems of helium plumbing. We’ve had a bunch of helium problems lately, most famously with the leaks in Starliner’s thruster system that have prevented astronauts Butch Wilmore and Suni Williams from returning to Earth in the spacecraft, leaving them on an extended mission to the ISS. Ironically, the launch itself was troubled by a helium leak before the rocket ever left the ground. More recently, the Polaris Dawn mission, which is supposed to feature the first spacewalk by a private crew, was scrubbed by SpaceX due to a helium leak on the launch tower. And to round out the helium woes, we now have news that the Peregrine mission, which was supposed to carry the first commercial lander to the lunar surface but instead ended up burning up in the atmosphere and crashing into the Pacific, failed due to — you guessed it — a helium leak.
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