From Kris Winer on Hackaday.io:
Small, connected device for smelling and hearing in any environment.
This is a 20 mm x 20 mm four-layer pcb tile full of interesting sensors (ICS43434 I2S Digital Microphone, MPU6500 acclerometer/gyro, BME280 pressure/temperature/humidity, and CCS811 air quality) with a Rigado BMD-350 UART BLE bridge for sending data to a smart phone all managed by a STM32L432 host MCU.
The STM32L432 is programmed using the Arduino IDE via the USB connector and serial data can be displayed on the serial monitor to verify performance and proper function, etc. But it is intended to be powered by a small 150 mAH LiPo battery for wireless sensing applications. The STM32L4 is a very low power MCU and with proper sensor and radio management it is possible to get the average power usage down to the ~100uA level, meaning a 150 mAH LiPo battery can run the device for two months on a charge.
A library for it is available on GitHub:
A collection of sketches to run the STM32L432-based (20 mm x 20 mm) sensor tile with an MPU6500 accel/gyro, ICS43434 I2S digital microphone, BME280 temperature/pressure/humidity sensor, and CCS811 air quality sensor. The sensor tile has an on-board MAX1555 LiPo battery charger, an on/off switch, and a Rigado BMD-350 nRF52 BLE module.
From Sven Gregori on Hackaday.io:
the USB MIDI keyboard dedicated to play all the four chord songs, from Adele via Green Day and Red Hot Chilli Peppers to U2 and Weezer. Thanks to MIDI, you can be any instrument – and all of them at once. Yay!
Built around an AVR ATmega328 and Objective Development’s V-USB library
, 4chord MIDI acts as a regular USB MIDI instrument. It supports playback in every key and five different playback modes:
- simple triad chord (root, third, fifth)
- triad chord + third + fifth + third as quarter notes
- triad chord + third + fifth + octave as quarter notes
- root note + third + fifth + third as quarter notes
- root note + third + fifth + octave as quarter notes
The playback tempo can be set between 60 and 240 bpm.
Here is the board in action:
The design files and source code are available on GitHub:
A few years ago, [Kumar] created the BeagleLogic, a 14-channel, 100 MSPS logic analyzer for the BeagleBone as an entry for the Hackaday Prize. This is a fantastic tool that takes advantage of the PRUs in the BeagleBone to give anyone with a BeagleBone a very capable logic analyzer for not much cash. This year,…
via Hackaday Prize Entry: BeagleLogic — Hackaday
1Bitsy 1UP is a retro inspired handheld game console, the design is based on the 1Bitsy STM32F415RGT6 ARM Cortex-M4F 168MHz 192kb RAM and 1MB Flash micro controller. 2.8″ TFT with capacitive touch, SDCard Reader and a few other components.
The display used is a TFT LCD with I2C CapTouch and ILI9341 driver. (should be compatible with the display sold by Adafruit on their breakouts as well as the buydisplay.com 2.8″ tft with CapTouch sensor)
The most basic design consists of:
- 1Bitsy STM32F415RGT6 (168MHz, 192kb RAM, 1MB Flash)
- 240×320 2.8″ TFT with capacitive touch and PWM backlight control
- D-Pad, ABXY, Start, Select buttons
- DAC audio out to headphones. (speakers optional)
- SDCard connected over SDIO interface
The hardware design files and firmware source code are available on GitHub: