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Solar panel li-po low power charger for esp8266

1 year ago 1311
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Solar system power for esp8266 device like weather sensor. You need 5V 0.15W solar panel and small li-po battery for example 200mAh. Zener diode stabilizes voltage on 4.3, schottky diode give 0.15-0.2V voltage drop because 4.3V is too much for li-ion battery and prevents lekage current from battery. You can use panel also like binary(0/1) light sensor.

Keep It Simple Stupid Not tested yet.




ID Name Designator Footprint Quantity
1 Solar_Panel 5V 0.15W U2 NONE 1
2 1N5817 D1 DO-41 1
3 BZX55C4V3 D2 DO-35 1
4 Li-Po BT1 LIPO 1
5 HT7333 U1 TO-92(TO-92-3) 1
6 1u C1,C2 RAD-0.1 2
7 100u C3 CAP-D3.0XF1.5 1
8 22k R1 AXIAL-0.3 1
9 10k R2,R3,R4 AXIAL-0.3 3
10 ESP-12F(ESP8266MOD) U3 ESP-12F(ESP8266MOD) 1
11 BOOT SW1 KEY-6.0*6.0-4 1
12 RESET SW2 KEY-6.0*6.0-4 1




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