Shared Projects

Ultra low voltage input switching DC converter with LiPo charger and 2.5V system voltage. The KiCad files and BOM are on my site: prjct.net

DIY LTX RapidFire!

ECE 4760 Project Board

NRF24 nitwork node with ATTiny841, LM92 or DS1621 temperature sensor, 3.3V regulator. It uses ISPogo landing pads for in-system programming.

This board is designed to fit in a Hammond 1551P case, 40x40x20mm. The board has space for a CR2032 battery on the bottom.

The NRF24 only fits in the box if it is soldered down directly, but using the header and a socket works fine outside this box.

ARM development made easy. OSH, fully featured IDE, Mac OSX Linux and Windows support, programmers and adapters not needed, ready to use out of your reflow toaster oven. Full documentation here https://github.com/zapta/arm/tree/master/pro-mini (scroll down that page).

7 RGB LED Pendant powered by an ATTINY85. Displays a plethora of animations in a package you can wear around your neck. Exposes 6 pin ICSP headers for reprogramming and supports recharging over USB.

More Info: https://github.com/Squeegy/ChakraPendant

SNES CiClone KEY PCB with ICSP

More info can be found here https://facelesstech.wordpress.com/2015/02/07/lets-get-atmega_drunk/

Bridgeable Stereo Amp using L165/LM383/LM1875/TDA2002/TDA2003/TDA2040 +80Hz lowpass filter. Split or single supplies Use datasheet for config guide. [email protected]

LDR and Gain

15x18 mm audio recorder based on the ATJ3315 codec SoC.

Lets the ESP8266 plug into a breadboard

MPU9250 9-axis motion sensor and MS5637 pressure sensor add-on for Teensy 3.1 hardwired for I2C. Added solder jumpers to take power and ground from board edge for easier breadboarding. Readjusted position of bypass capacitor.

This is a small adapter board to use an HC-05 or HC-06 bluetooth serial adapter for a Yaesu FT-100, FT-857, or FT-897. The circuit is exactly the same as the one for the FT-817, just a slightly different mounting method for the LED and Mini-DIN 8 connector. SJ1 is used to provide V+ to the adapter to enable AT command mode on an HC-05. R1-R3 are identical values, and are used to convert the 5v TTL signal from the rig to the 3.3v signal expected by the bluetooth adapter. R4 is the current limiting resistor for using an HC-06, R5 is the current limiting resistor for the status LED for an HC-05. R4/R5 may be omited if you do not desire having a status LED. The voltage regulator is a AMS1117-3.3v or LM1117 3.3v regulator. This board is designed to go straight off the back of the radio and not interfere with any other ports. This board WILL NOT fit on the FT-817 when it is standing on it’s back feet, although otherwise it will work.

This is a small adapter board to use an HC-05 or HC-06 bluetooth serial adapter for rig control of a Yaesu FT-817. SJ1 is used to provide V+ to the adapter to enable AT command mode on an HC-05. R1-R3 are identical values, and are used to convert the 5v TTL signal from the 817 to the 3.3v signal expected by the bluetooth adapter. R4 is the current limiting resistor for using an HC-06, R5 is the current limiting resistor for the status LED for an HC-05. R4/R5 may be omited if you do not desire having a status LED. The voltage regulator is a AMS1117-3.3v or LM1117 3.3v regulator. This board is designed to be able to be left on the radio, even when it is standing on the back end, and not interfere with any other ports.

Please note that the FT-817 leaves the port powered at all times, so it may be advisable to leave the LED off if concerned about power consumption. The bluetooth adapter itself is rated to consume 10mA while actively paired, and 30mA while disconnected, according to the datasheets I have seen.

EDIT 7/24/26: V2 of this board has been created due to some issues of an unconnected ground. Pads for a capacitor have also been added. V2 can be found here: https://oshpark.com/projects/eAvOHn82

Breakout for both WS2812 and WS2812B

Wind Sensor Board