[Bas BotBerg] wanted to use a portable Bluetooth thermal printer to run off reports on sensor data collected by an ESP32-C3 microcontroller. But as is so often the case these …read more (https://hackaday.com/2026/09/14/writing-an-esp32-bluetooth-printer-driver-in-two-acts/)

An Open Heart Rate Monitor
https://hackaday.com/2026/09/14/an-open-heart-rate-monitor/

If you spend any time near a gym, you may be familiar with Bluetooth heart rate monitors — a small pack of electronics mounted on a strap round the chest …read more (https://hackaday.com/2026/09/14/an-open-heart-rate-monitor/)

Fixing a Ubiquiti 16-Port PoE Switch With an Extra Hole
https://hackaday.com/2026/09/15/fixing-a-ubiquiti-16-port-poe-switch-with-an-extra-hole/

After saving a £300, 16-port Ubiquiti network switch from getting tossed into the trash, [Buy It Fix It] got the honor of trying to repair it. With four ports and …read more (https://hackaday.com/2026/09/15/fixing-a-ubiquiti-16-port-poe-switch-with-an-extra-hole/)

Every ZX81 Expansion Card You Ever Wanted, All At Once
https://hackaday.com/2026/09/15/every-zx81-expansion-card-you-ever-wanted-all-at-once/

The Sinclair ZX81 was a masterpiece of Sir Clive’s desire to get the most out of the least hardware, being about as minimalist as it was possible to get and …read more (https://hackaday.com/2026/09/15/every-zx81-expansion-card-you-ever-wanted-all-at-once/)

Linux Fu: Speak Up!
https://hackaday.com/2026/09/15/linux-fu-speak-up/

Apparently, people hate typing. As every movie and TV show suggests, the future is talking to computers. There was a time when speech recognition was complex and not very good. …read more (https://hackaday.com/2026/09/15/linux-fu-speak-up/)

Running Linux 6.11 on the ESP32-S3 with a Few Tweaks
https://hackaday.com/2026/09/15/running-linux-6-11-on-the-esp32-s3-with-a-few-tweaks/

With the Xtensa Lx7 twin CPU cores in the ESP32-S3 running at a relatively zippy 240 MHz and accompanying PSRAM of up to 16 MB, you might find yourself wondering …read more (https://hackaday.com/2026/09/15/running-linux-6-11-on-the-esp32-s3-with-a-few-tweaks/)

Hackaday Europe 2026: Bare Metal Made Easy
https://hackaday.com/2026/09/15/hackaday-europe-2026-bare-metal-made-easy/

When we talk about programming in “bare metal,” it basically means writing software that runs right on the hardware with no operating system or abstraction layers in between. This gives …read more (https://hackaday.com/2026/09/15/hackaday-europe-2026-bare-metal-made-easy/)