AngstromIO is one of the smallest devboards out there, barely longer than a USB-C connector, based on the ATtiny1616 MCU (16kB flash). It comes with 2 Addressable RGB LEDs, and 2 GPIOs as well as I2C lines are broken out. I made a dual CH340 programming board too, both for UPDI programming and debugging (one way Serial Communication). The third PCB is a cost effective, USB-C devboard based on the CH32v003 (QFN) with a small 5x4 charlieplexed LED matrix.
This PCB is a 7 segment display LED array, made of 32x 0603 LEDs, on which you can mount a 3d printed diffuser that shapes the LED segments. The idea is that from one PCB with 32 LEDS, some of which are arranged in 3 digits 7 segment displays, you can design your own custom diffuser, to build custom 7 segment displays, with custom LED indicators. The display is driven by 2 AW9523 ICs which are extremely cheap (30 cents each) and easy to control via I²C.
This RGB LED driver built around an ESP32 supermini devboard comes with 5 P channel Mosfets and a 5V LDO voltage regulator. With this simple module, I'll be able to command RGB strips and White LED Strips with a Blynk IoT app on my phone. With it's 5 Mosfets, this module can control everything that needs switching 5 high sink loads (up to 5 Amps), even though this board has been specifically designed for the 3 R, G and B channels, with the 2 other channels remaining for white LED Strips.
The IOX-77 is a powerful ESP32-C3 based devboard. It comes with 75 GPIOs, which is even more than the Arduino Mega while being smaller and embedding WiFi and Bluetooth capabilities. It's like a 6 core configuration with 5 cheap CH32v003 MCUs communicating with the main core, the ESP32. With this devboard, I'll never run out of IOs for all my future projects, even those requiring dozens of IOs. This board is an upgraded ESP 32 devboard, gathering the computational power of the ESP32 and the many GPIOs offered by all the CH32.
This RGB LED driver built around an ESP32 supermini devboard comes with 5 P channel Mosfets and a 5V LDO voltage regulator. With this simple module, I'll be able to command RGB strips and White LED Strips with a Blynk IoT app on my phone. With it's 5 Mosfets, this module can control everything that needs switching 5 high sink loads (up to 5 Amps), even though this board has been specifically designed for the 3 R, G and B channels, with the 2 other channels remaining for white LED Strips.