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STD Watchdog Timer (555 based)
Watchdog Timer (555 based)
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Update time：
2023-10-03 18:35:45
Creation time：
2017-12-09 05:27:49
Description
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/
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 100nF | C1 | 0805 | 1 |
| 2 | 22uF | C2 | 0805 | 1 |
| 3 | SOD4007 | D1 | SOD-123F | 1 |
| 4 | Red | LED1,LED2 | LED-0805 | 2 |
| 5 | 2N3906S | Q1 | SOT-23(SOT-23-3) | 1 |
| 6 | 510R | R1,R4,R5 | 0805 | 3 |
| 7 | 1M | R2 | 0805 | 1 |
| 8 | 4.7k | R3 | 0805 | 1 |
| 9 | NE555DR | U1 | SOIC-8_150MIL | 1 |
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