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STD esp8266 alarm power interface
License: Public Domain
Mode: Editors' pick
- 0
Update time：
2021-01-02 10:30:20
Creation time：
2017-11-08 16:47:01
Description
Esp8266 as alarm detector using a reed NO/NC contact
Inserted in a power bank originaly handling a single or double 18650 lipo battery.
The 18650 battery is replaced by a shorter 16340 battery to get some place.
This pcb get the reed openning action, switch the 3.7v to the USB charger/buck converter, the ESP hold the voltage and send messages until the window or door is open.
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 470uF | C1 | TANT_D | 1 |
| 2 | 4k7 | R1,R4 | C0805 | 2 |
| 3 | 22k | R2,R3 | C0805 | 2 |
| 4 | BC549 | T1 | RSOT-23 | 1 |
| 5 | 10K | R5 | C0805 | 1 |
| 6 | 2K2 | R6 | C0805 | 1 |
| 7 | P5504 | M1 | TO-252 | 1 |
| 8 | WEMOS D1 MINI/ESP8266 | U1 | HDR1X5 | 1 |
| 9 | AMS1117-3.3 | U2 | SOT-223 | 1 |
| 10 | 3.7V | V1 | HDR1X2 | 1 |
| 11 | USB Boost | P1 | HDR-2X1/2.54 | 1 |
| 12 | Reed_SWITCH | SW1 | HDR1X3 | 1 |
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