#opensourcehardware

Giving Tuesday – 2025 Open Hardware Summit #GivingTuesday 📅🛠️🌍

In 2025, the Open Hardware summit will be in Edinburgh, Scotland, May 30-31. The Open Source Hardware Association (OSHWA) hosts the summit. OSHWA is a 501(c)(3) tax-exempt public charity that certifies open-source hardware designs and shares data about the growing community.

Here is their pitch for the 2025 Open Hardware Summit, where Adafruit is a sponsor again!

"The Open Hardware Summit is the only conference dedicated to discussing Open Source Hardware. Open Source Hardware is a community-focused method of creating where we share knowledge openly, welcome collaboration, and frequently create together. The Open Hardware summit is a place to compare notes, see the state of the art, and spend some time talking about where the open source movement is headed. The summit often contains workshops, talks, connections, mentorship.

If you haven't yet, please consider sponsoring the 2025 Open Hardware Summit again this year: https://2025.oshwa.org/sponsor/. We are headed to Scotland this year and hope you'll join us. Your funding always allows us to put on a stellar event that people rave about. There are new levels and added headline sponsor levels this year.

TLV320DAC3100 first bops 🔊🎶💃🕺

Text mode HSTX DVI output on the Fruit Jam 🔡🖥️🍓

Jepler has been working round the clock to get HSTX DVI

) output support for the Fruit Jam

) working - this mode is neat because its 'text only' - you get 3-bit color text, it does that by creating a 'resolution' of 91 x 30 characters, you can only set the color and glyph. However, the monitor output is a non-buffered 1280x720, with each scanline generated 'on the fly', so you don't need any SRAM. This could be great for something like a Z-machine emulator (

Fruit Jam RP2350B credit-card mini computer with all the fixin's 🍓🍇💾

We were catching up on a recent Hackaday hackchat with Eben Upton (https://hackaday.io/event/202122-raspberry-pi-hack-chat-with-eben-upton) and learned some fun facts: such as the DVI hack for the RP2040 was inspired by a device called the IchigoJam (https://www.hackster.io/news/ichigojam-combines-strawberry-and-raspberry-to-deliver-a-raspberry-pi-pico-powered-educational-micro-66aa5d2f6eec). We remember reading about this back when it was an LPC1114, now it uses an RP2040. Well, we're wrapping up the Metro RP2350 (https://www.adafruit.com/product/6003), and lately, we've been joking around that with DVI output and USB Host support via bit-banged PIO, you could sorta build a little stand-alone computer. Well, one pear-green-tea-fueled-afternoon later we tried our hand at designing a 'credit card sized' computer - that's 3.375" x 2.125", about the same size as a business card (https://hackaday.com/2024/05/07/the-2024-business-card-challenge-starts-now/) and turns out there's even a standard named for it: ISO/IEC 7810 ID-1 (https://www.iso.org/standard/70483.html).

Anyhow, with the extra pins of the QFN-80 RP2350B, we're able to jam a ridonkulous amount of hardware into this shape: RP2350B dual 150MHz Cortex M33 w/ PicoProbe debug port, 16 MB Flash + 8 MB PSRAM, USB type C for bootloading/USB client, Micro SD card with SPI or SDIO, DVI output on the HSTX port, I2S stereo headphone + mono speaker via the TLV320DAC3100 (https://www.digikey.com/en/products/detail/texas-instruments/tlv320dac3100irhbt/2353656), 2-port USB type A hub for both keyboard and mouse or game controllers, chunky on-off switch, Stemma QT I2C + Stemma classic JST 3-pin, EYESPI for TFT displays, 5x NeoPixels, 3x tactile switches, and a 16-pin socket header with 10 A/D GPIO + 5V/3V/GND power pins. The PSRAM will help when we want to do things like run emulations that we need to store in fast RAM access, and it will also let us use the main SRAM as the DVI video buffer.

Espressif programmer test success! 💻✨🔧

While developing boards, there are oftentimes we want to program ESP chips without going through the onboard USB port; this adapter will help us (and others) do that! It has a CP2102N USB-serial chip

https://www.digikey.com/short/bm7n3p5z

...with RX/TX signal LEDs and two transistors wired up to the DTR/RTS line for the 'esptool standard' reset procedure technique. The output IO, plus a 3.3V 500mA regulated output, is available on a socket header, so you can plug wires in for quick programming and debugging. You can use this for everything from an ESP8266 up to the ESP32-P4! Here, we are testing it with a HUZZAH ESP8266 breakout board