Shared Projects

Energy harvester switches load to nRF52 radio. On at 2.2V, off at 1.7V, max 3.3V.

Power distribution, monitoring and charging. http://exuvo.se/project/page/kbot4

HALL sensor preamp/analog axis calibrator

Ble controller Rev C SWD helper

WiFi-enabled Motion Control https://github.com/michaelkoetter/MotorThing

Designed for a CP2104 USB to UART bridge, broken out suitable for breadboard prototyping.

Note that centre pad isn’t grounded, and there is no ground plane.

4 Port USB Hub with FE1.1 IC. (Untested)

TLC59283 16bit Shift Register Breakout

BLF flashlight driver, 17 mm, DD+m

Features

• 17 mm direct drive + 350 mA regulator LED driver
• No OTC - Intended for e-switch, memory-decay or no-memory firmware.
• R5 to eliminate unintentional Vcc boosting during PWM.
• R3 to eliminate unintentional flashing during mode changes.
• Oversized heat plane for the 7135 with good thermal link to the ground ring.
• Generous 0603 pad sizes through-out that will accept 0805 parts as well.
• ‘SS’ SOIC package size for MCU. Tiny85 requires pin-bending to fit.

Revision changes

• Move MCU and 7135 slightly for better programming clip clearance

Suggested parts list

• U1: Atmel Attiny25, SSU or SSN package
• U2: 7135 350 mA LED driver
• Q1: Vishay SiR800DP
• C1: 10 uF, X5R or better, 0603 or 0805
• D1: Schottky diode, 200 mA 20 V or better, 0805 or SOD323
• R1: 22 / 330 kohm, 1%, 0603 (R1, R2 larger values for e-switch lights)
• R2: 4.7 / 100 kohm, 1%, 0603
• R3: 100 kohm, 5%, 0603
• R5: 4.7 ohm, 5%, 0603

5B Instrumentation Box Fuse Card

Breakout board for the Nintendo Gameboy Game Link cables.

Note that I would NOT recommend to use these. Replacement ports for the GBA are rather cheap and work way beter than this. However, if you want, you can use these and they might be “good enough” in some cases, but you will most likely have to sand off the mouse bites that OSH Park adds.

Beaglebone Shield for FresonCam

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. When ordering this board, order it in the 2oz, or it may not fit between the connector’s pins.