Shared Projects

Clock generator

Breakout board for nRF51822 SoC with Cortex M0 processor and Bluetooth LE 2.4 GHz radio. Also on board are Bosch’s BMP280 pressure sensor and Invensense’s MPU9250 9 DoF motion sensor, and MAX1555 LiPo battery charger with USB (charging only). Replaced TLV70733 200 mA 3V3 regulator with MIC5528 500 mA 3V3 regulator. LED indication for 3V3 on, battery charging, and GPIO-controlled rgb LED. Side through-holes for I2C, UART, SWD program port and 12 GPIOs.

Wii Nunchuck to Atari 2600 adapter

TSL230R and TMP36 based datalogger for Particle.io Photon

!!NOT TESTED!! Made as a first project using KiCAD. Mistakes have probably been made.

Documentation

https://github.com/8n1/ESP8266-Breakout-Adapter/blob/master/Breakout%20Adapter%20v2/README.md

Documentation

https://github.com/8n1/ESP8266-Breakout-Adapter/blob/master/Breakout%20Adapter%20v2/README.md

Yet another USB Gecko SE clone

IoT - Home Automation Hub

Particle Core and Photon to NodeMCU adapter for Remora Project See detailled description for more information
See my blog for some other projects

Tiny USB dongle board & breakout for STM32L0. Contact me for specs.

Teensy-like board for STM32L0. Contact me for specs.

low-power stm32 data-logger, dev-board, etc. http://www.amiketo.com/

This is a shield to mount the Particle.io (formerly spark.io) boards i.e. Core/Photon and Electron, on the nRF5x DK BTLE (Bluetooth) boards. This shield supports the nRF51-DK and the nRF52-DK boards.

Actions

When using the nRF51-DK, the shield requires that the solder bridge SB17 be bridged.

The P1 header on the shield needs to be in either reset position so a jumper is required. The “common reset” position ties the reset lines of the particle.io board and the nRF. This position does not allow the nRF to be flashed. The “reset/Program” position ties the D2 of the particle.io board to the Reset of the nRF. This position allows the nRF to be flashed.

See the particle.io website and the Nordic Semiconductor website for details of the boards used.

Parts required by the shield

1. Shield stacking headers
2. Headers for the Particle module
3. Header for Reset Selection. (Can use a solder line to do the selection)
4. Jumper for the Reset Selection. (Not needed if you used a solder line)
5. 18K Resistor for nRF_RESET pullup (optional)

Issues

1. The Central ICSP header is not required and was not used during testing.
2. Not tested with the nRF52-DK board

Wireless Board Designed by Flutter

ST Microelectronic’s M41T62 ultra-low-power real time clock coupled with Bosch’s BME280 pressure, humidity, and temperature sensor and ST’s M2402DRC 2Mbit EEPROM in an appallingly small add-on board for Teensy 3.1. Power is supplied via digital write to general GPIO pins since the total power requirement never exceeds 2 mA. Communication is via I2C and there are 4K7 pullup resistors on board. The 512 Hz square-wave output allows the Teensy 3.1 microcontroller to make periodic calibration updates to the RTC calibration register so the clock is continuously compensated for maximum (~2 ppm or 1 minute a year) accuracy. The Taiyo Yuden PAS3225 2.6V 14 mF super capacitor and 1N4148 diode provide power to the RTC time keeper even when disconnected from the microcontroller. The PAS3225 5 microAhour super cap can run the RTC (which needs ~330 nA at 2.6 V) for about 18 hours. The board is now a tiny weather logging station: pressure, temperature, and humidity can be logged once per minute for 15 days! Went back to standard 1N4148 diode.

Breakout board to test magnetometer performance. Magnetometers include Honeywell’s HMC5883, Asahi Kasei’s AK8963C, and ST Microelectronics' LIS3MDL. Board allows comparative test of basic performance and test of effects of different mag data on EM7180 sensor fusion using the MPU6500 accel/gyro. Fixed LIS3MDL package error.

TSL230R BoB