BSD
A remote-controlled PWM power management board for small (10 W - 20W) solar panels, connected to either lead-acid batteries, or trickle-charged Lithium ones (12 V target in both cases). Designed to be as much through-hole as possible, and to only use LCSC components.
Has MOSFET-controlled outputs, most of which are PWM-capable.
The circuit is designed for about 3A max current on any single line, including the solar & battery ones.
PCB designed for this enclosure: https://www.aliexpress.com/item/5PCS-Plastic-Electronic-Project-Box-Shell-Case-Enclosure-Instrument-Case-100x60x25mm-10x6x2-5CM/32850410579.html
This version uses PWM to keep the battery charged. The exact algorithm and voltages are set in firmware.
There are ports for a 433 MHz ASK/OOK receiver module, HC-06 Bluetooth module, and a HC-12 module (sharing ports with the Bluetooth module), as well as for an I2C OLED display and an AM2320 temperature & humidity sensor.
| ID | Name | Designator | Footprint | Quantity | BOM_Manufacturer Part |
|---|---|---|---|---|---|
| 1 | ESP-12F(ESP8266MOD) | ESP-12F | ESP-12F | 1 | ESP-12F(ESP8266MOD) |
| 2 | CON_HEADER_1X03-PTH | PROG1 | M1X3 | 1 | ? |
| 3 | CON_HEADER_1X04 | UART1 | M1X4 | 1 | ? |
| 4 | 330uF | C1,C3 | CAP-TH_BD8.0-P3.50-D1.0-FD | 2 | 330uF 16V 8*12 |
| 5 | 47K | R4 | RES-TH_BD2.4-L6.3-P10.30-D0.6 | 1 | RNU18F4702A520NH |
| 6 | LM2596S-5.0/TR | LM2596 | TO-263-5_L10.6-W9.6-P1.70-LS15.9-TL | 1 | LM2596S-5.0/TR |
| 7 | 1uF | C2,C4,C5 | CAP-TH_L5.0-W2.5-P5.08-D0.7 | 3 | CD1H105MC9BEF4E000 |
| 8 | BS170 | Q1,Q2,Q3,Q4,Q5 | TO-92-3_L4.9-W3.7-P1.27-L | 5 | BS170 |
| 9 | 33uH | L1 | IND-SMD_L12.6-W12.6_MCF-13XX | 1 | GSDRH127PT-330M |
| 10 | 10K | R1,R2,R3 | RES-TH_BD1.9-L3.3-P7.30-D0.5 | 3 | MFR0W8F1002A50 |
| 11 | GL5528(10-20) | R5 | RES-TH_L5.1-W4.3-P3.40-D0.5 | 1 | GL5528(10-20) |
| 12 | SR5100 | D1 | DO-201AD_BD5.3-L8.4-P12.50-D1.4-FD | 1 | SR5100 |
| 13 | HT7333-A_C73726 | HT7333 | TO-92-3_L5.1-W4.1-P1.27-L | 1 | HT7333-A |
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