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STD Solar panel li-po low power charger for esp8266
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License: Public Domain
Description
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.
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| 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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