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Backup power switch-12v-Module

abel-msk·Backup-power-switch-12v-Module

Backup power switch-12v-Module layout, top view — open source ESP32 board by abel-msk

About the Backup power switch-12v-Module

Backup power switch-12v-Module is an open source ESP32 PCB design by abel-msk, published on GitHub. It is a 2-layer board measuring 94.3 × 76.2 mm, with 57 components from 37 distinct parts.

Its main chip is the ESP32-C3 Pro Mini, from the ESP32 family. Other key parts include the INA219AxD, LTV-817, CN3763 and AMS1117-3.3. By type, the board carries 12 resistors, 9 connectors, 9 capacitors, 8 test points, 7 ICs and 7 diodes.

It belongs with the power & battery, sensors and iot & wireless designs in this gallery.

From the project

PCB Design. Small 12v 10A ups board for 18650x3 bat charger, power and battery current sensors and esp32-c3 board

Board for 12v power switch. Plain power and battery backup. Switchng provided by LM393 comparator. Both compared line are adjustable by potentiometer. Equipped with: Battery 3S charger, Two INA219 i2c sensors ESP32-C3 wifi board Charge and done charger led signals passed to ESP 1x External connector for i2c line and charger status 1x Connector with SPI for ext display 4x 12v power connector

Backup power switch-12v-Module, from the project README
From the project README

Main components on the Backup power switch-12v-Module

INA219AxDLTV-817CN3763ESP32-C3 Pro MiniAMS1117-3.3

Backup power switch-12v-Module bill of materials (BOM)

57 components, 37 distinct parts.

QtyPartRefs
2
INA219AxD
U2, U3
2
LTV-817
U4, U5
1
CN3763
U6
1
ESP32-C3 Pro Mini
U7
1
AMS1117-3.3
U8
1
AO3401A
Q2
1
BSS138
Q3
1
BAT/PWR IN
J1
1
External
J2
1
PWR OUT
J3
4
Barrel_Jack_MountingPin
J4, J6, J7, J8
1
Esternal
J5
1
PWR SELECTOR
J9
1
SRD-12VDC-SL-C
K1
1
120 (for 1A)
Rcs2
1
BAT_IN
TP1
1
PWR_IN
TP2
1
GND
TP3
5
OUT
TP4, TP5, TP6, TP7, TP8
1
DONE
D1
Show 17 more
QtyPartRefs
1
1N4007W (A7)
D2
2
SS26
D3, D4
1
CHRG
D5
1
ON
D6
1
MURF2060CT
D7
1
4.7uH
L2
1
4.7uF
C1
2
10uF
C2, C3
2
100nF
C4, C6
2
10uF
C7, C9
1
1uF
C8
1
220nF
C10
6
10k
R2, R6, R7, R13, R14, R15
2
0,002R
R4, R8
1
0R
R5
1
120
R9
2
1k
R10, R12

Backup power switch-12v-Module design files

The KiCad project lives in the abel-msk/Backup-power-switch-12v-Module repository on GitHub; these links point at the commit this page was built from.

Backup power switch-12v-Module: common questions

What microcontroller does the Backup power switch-12v-Module use?

The Backup power switch-12v-Module is built around the ESP32-C3 Pro Mini, from the ESP32 family.

How big is the Backup power switch-12v-Module?

The Backup power switch-12v-Module measures 94.3 × 76.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Backup power switch-12v-Module?

57 components, from 37 distinct parts. The full bill of materials is listed on this page.

Where can I download the Backup power switch-12v-Module design files?

From the abel-msk/Backup-power-switch-12v-Module repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Backup power switch-12v-Module design in my own project?

The repository has no license, so all rights stay with abel-msk. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Backup power switch-12v-Module without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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