Shared projects

POV Twirlie v0.2

2 layer board of 6.00 x 0.50 inches (152.4 x 12.7 mm).
Shared on December 30th, 2015 18:01

Uses the same firmware as the Tiny Blinky. Mount it on a dowel and twirl it between your hands and watch the lights trace out POV patterns.

This version moves the battery inwards slightly to try and improve the balance, and moves the LEDs closer together to make better patterns.


POV Twirlie v0.2

2 layer board of 6.00 x 0.50 inches (152.4 x 12.7 mm).
Shared on December 30th, 2015 18:01

Uses the same firmware as the Tiny Blinky. Mount it on a dowel and twirl it between your hands and watch the lights trace out POV patterns.

This version moves the battery inwards slightly to try and improve the balance, and moves the LEDs closer together to make better patterns.



FE-5680A power / interface board v1.1

2 layer board of 1.35 x 1.58 inches (34.3 x 40.0 mm).
Shared on October 25th, 2015 04:21

Rubidium standard breakout/adapter. Connect a surplus laptop 18V-24V DC power supply and it outputs +15V and +5V for the FE-5680 (the +5 can be disabled by breaking a jumper if your unit doesn’t require +5). The PPS and serial I/O are presented on a SIP-4 and the RF output is on a separate 2 pin header.

This is a modification of the Pi Power circuit.


FE-5680A power / interface board v1.1

2 layer board of 1.35 x 1.58 inches (34.3 x 40.0 mm).
Shared on October 25th, 2015 04:21

Rubidium standard breakout/adapter. Connect a surplus laptop 18V-24V DC power supply and it outputs +15V and +5V for the FE-5680 (the +5 can be disabled by breaking a jumper if your unit doesn’t require +5). The PPS and serial I/O are presented on a SIP-4 and the RF output is on a separate 2 pin header.

This is a modification of the Pi Power circuit.



AVR ISP Pogo Adapter v0.5

2 layer board of 0.70 x 0.90 inches (17.8 x 22.9 mm).
Shared on June 28th, 2015 02:05


AVR ISP Pogo Adapter v0.5

2 layer board of 0.70 x 0.90 inches (17.8 x 22.9 mm).
Shared on June 28th, 2015 02:05



Raspberry Pi AVR ISP Cap v0.2.1

2 layer board of 1.35 x 0.83 inches (34.3 x 21.0 mm).
Shared on June 11th, 2015 03:00

AVR programming adapter for Raspberry Pi. Use “linuxgpio” driver in avrdude v6.1 or newer. Pin assignments:

  • RESET - GPIO 25
  • MISO - GPIO 9
  • MOSI - GPIO 10
  • SCK - GPIO 11

This includes switchable target power (3.3v/5v/off) protected by an AP2331 current limiter as well as a bus buffer / level shifter IC. There’s also an LED to indicate when programming is in progress.


Raspberry Pi AVR ISP Cap v0.2.1

2 layer board of 1.35 x 0.83 inches (34.3 x 21.0 mm).
Shared on June 11th, 2015 03:00

AVR programming adapter for Raspberry Pi. Use “linuxgpio” driver in avrdude v6.1 or newer. Pin assignments:

  • RESET - GPIO 25
  • MISO - GPIO 9
  • MOSI - GPIO 10
  • SCK - GPIO 11

This includes switchable target power (3.3v/5v/off) protected by an AP2331 current limiter as well as a bus buffer / level shifter IC. There’s also an LED to indicate when programming is in progress.



OpenEVSE II logic/display v1.3

2 layer board of 3.85 x 1.45 inches (97.8 x 36.8 mm).
Shared on May 18th, 2015 23:46

A new design for OpenEVSE. This is the logic/display board.

This version swaps out the previous power supply caps with new parts, since the old ones were marked as obsolete on DigiKey.

Also, MOSFET gate biasing has been added to the pilot generator secondary side. This allows us to use the same BOM part for both primary and secondary in the pilot generator, at the cost of adding two resistors back to the design. Alternatively, you can use pre-biased BJT arrays for the secondary pair and leave the extra resistors out. Both options are known to work properly, with slew rates of 1 µs or less.


OpenEVSE II logic/display v1.3

2 layer board of 3.85 x 1.45 inches (97.8 x 36.8 mm).
Shared on May 18th, 2015 23:46

A new design for OpenEVSE. This is the logic/display board.

This version swaps out the previous power supply caps with new parts, since the old ones were marked as obsolete on DigiKey.

Also, MOSFET gate biasing has been added to the pilot generator secondary side. This allows us to use the same BOM part for both primary and secondary in the pilot generator, at the cost of adding two resistors back to the design. Alternatively, you can use pre-biased BJT arrays for the secondary pair and leave the extra resistors out. Both options are known to work properly, with slew rates of 1 µs or less.