Shared projects

UVLO RevC

2 layer board of 2.00x1.50 inches (50.80x38.13 mm).
Shared on August 23rd, 2014 19:46.

LiPo low-voltage cut-off 2014-03-24

After destroying a LiPo battery when forgetting to turn off a LiPo powered Raspberry Pi device, I built this circuit. It features a soft-power-on switch based on a P-channel MOSFET, and a space for an ATTiny85 to monitor voltage and turn off when it’s too low.

I have built this and use it, and I additionally talk to the ATTiny85 using the SPI in the Raspberry Pi (without chip select) to report voltage to the host, and do soft-power-off on demand.

Firmware for the ATTiny85 obviously is important for this project to work right!

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Onyx Switch A

OnyxRobots.

2 layer board of 1.90x1.10 inches (48.29x27.94 mm).
Shared on August 23rd, 2014 19:46.

20140420 P-channel Power Switch

This switch features pushbutton on and off action, as well as ability to actuate on and off through the 100-mil header. Power handling up to 20A, depending on specific P-channel MOSFET used and tolerance for board heat.

I have ordered, built, and tested this design, and it works well. Leakage current when off is below what I can measure – approximately equal to zero.

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