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 | Mounted |
|---|---|---|---|---|---|
| 1 | LP2950G-50-T92-K | LDOIC | TO-92(TO-92-3) | 1 | Yes |
| 2 | DC005-2.0MM | VSOL,VBAT1,VBAT2,V12V1,V12V2,V12V3,V5V1,V5V2,V5V3 | DC-5020 | 9 | Yes |
| 3 | 210S-1*2P L=11.6MMGold-plated black | BATBRIDGE | 210S-1X2P | 1 | Yes |
| 4 | 33uH | L1 | 11.2*12.2 | 1 | Yes |
| 5 | LM2596T-5.0 | BUCK | TO-220-5_VERTICAL | 1 | Yes |
| 6 | 680uF | C4 | CAP-10*16 | 1 | Yes |
| 7 | 220uF | C5,C3 | CAP-D5.0XF2.0 | 2 | Yes |
| 8 | ATMEGA328P-PU | ATMEGA328 | DIP-28_300MIL | 1 | Yes |
| 9 | FIR4N65BPG | Q1,Q2,Q3,Q4,Q5,Q6 | TO-251(I-PAK) | 6 | Yes |
| 10 | HMB1275-05B | BUZZER1 | B-12*7.5 | 1 | Yes |
| 11 | 10KΩ | R1,R2,R3,R4,R5,R6,R8,R7,R13,R14,R15 | AXIAL-0.4 | 11 | Yes |
| 12 | 39KΩ | R10,R9 | AXIAL-0.4 | 2 | Yes |
| 13 | 433MHz RX | RX1 | 4P | 1 | Yes |
| 14 | hc-06 | HC-05 | HC-06 | 1 | Yes |
| 15 | 100nF | C6 | CAP-0.2 | 1 | Yes |
| 16 | 1uF | C7,C8,C11 | RAD-0.2 | 3 | Yes |
| 17 | 8MHz | X1 | OSC-49S-1 | 1 | Yes |
| 18 | 22pF | C9,C10 | RAD-0.2 | 2 | Yes |
| 19 | 1KΩ | R11 | AXIAL-0.4 | 1 | Yes |
| 20 | 2KΩ | R12 | AXIAL-0.4 | 1 | Yes |
| 21 | CON_HEADER_PRG_AVR_ICSP-PTH | ICSP | HEADER_PRG_2X03 | 1 | Yes |
| 22 | CON_HEADER_1X04 | I2C | M1X4 | 1 | Yes |
| 23 | SR2100 | D1,D2 | DO-15 | 2 | Yes |
| 24 | HC-12 | HC-12 | HC-12 | 1 | Yes |
| 25 | AM2320 | AM2320 | AM2320 | 1 | Yes |
| 26 | WJ124-3.81-2P | V12V1A,V12V2A,V12V3A,V5V1A,V5V2A,V5V3A,VSOLA,VBAT1A,VBAT2A | KF124-3.81-2P | 9 | Yes |
| 27 | IRF9640PBF | QPWM | TO-220(TO-220-3) | 1 | Yes |
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