Shared projects

FFC 10 breakout

by nsayer.

2 layer board of 0.50x1.10 inches (12.70x27.94 mm).
Shared on January 24th, 2015 17:30.

For OpenEVSE / Hydra debug and dev.

Ironically, this design was created, uploaded and ordered during a power failure.

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Toast-R-Reflow, Controller & LCD backpack (84)

by nsayer.

2 layer board of 3.15x1.40 inches (80.04x35.59 mm).
Shared on January 22nd, 2015 23:06.

This is the Toast-R-Reflow controller “backpack.” It mounts on the back of a 80x36mm 2x16 LCD display.

This variant has an ATTiny84 and an AD8495 analog thermocouple amplifier. It’s cheaper than the model II controller, but the flash is full, so there’s no room for more features.

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Toast-R-Reflow, Controller & LCD backpack II

by nsayer.

2 layer board of 3.15x1.40 inches (80.04x35.59 mm).
Shared on January 22nd, 2015 23:05.

This is the Toast-R-Reflow controller “backpack.” It mounts on the back of a 80x36mm 2x16 LCD display.

This variant uses an ATMega328P controller and a MAX31855 thermocouple amplifier. It’s more expensive than the model I controller, but there’s lots of room for more features in the flash, it has connections for 3 buttons instead of just 1 and an FTDI serial port. Also, the MAX31855 has a much wider temperature range while having higher resolution.

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Round holiday ornament

by nsayer.

2 layer board of 2.02x2.12 inches (51.31x53.72 mm).
Shared on December 10th, 2014 18:26.

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Crazy Clock v0.8.1

by nsayer.

2 layer board of 0.85x0.48 inches (21.62x12.09 mm).
Shared on November 23rd, 2014 02:48.

Ticks randomly, but keeps “perfect” time.

A single AA battery will run it for 18 months-ish. Connect ‘clock’ terminals to a lavet stepper motor style clock movement.

NOTE: This version has incorrect crystal loading capacitance. It runs ~120 ppm fast. There is a more recent design that fixes this.

Firmware.

BOM:

  • R1 - 10k
  • R2 & R3 - 100R
  • C1 - 10 µF
  • C2 & C3 - 22 µF
  • C4 - 0.1 µF
  • D1 & D2 - BAT54A
  • L1 - 47 µH
  • IC1 - ATTiny45
  • IC2 - NCP1402 3.3V
  • Y1 - 32.768 kHz, 10 ppm

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