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Std EditionWatchdog Timer (555 based)

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Published Time:2017-12-09 13:27:49
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Description

A 555 based watchdog timer. The timer must be reset periodically (patting the dog). If this reset is not set, then the micro-controller patting it will be reset.

Info - http://upperbound.com/projects/555-watchdog-timer/

Documents

Watchdog Schematic

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Watchdog PCB

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ID Name Designator Footprint Quantity
1 NE555DR U1 SOIC-8_150MIL 1
2 100nF C1 0805 1
3 Red LED1,LED2 LED-0805 2
4 510R R1,R4,R5 0805 3
5 1M R2 0805 1
6 4.7k R3 0805 1
7 22uF C2 0805 1
8 2N3906S Q1 SOT-23(SOT-23-3) 1
9 SOD4007 D1 SOD-123F 1

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