HardLabs

18650-Tester

Studented0·18650-Tester·hardware/CellScan_Schematic.kicad_pcb

18650-Tester PCB layout, top view — open source ESP32 board by Studented0
Simulate this board

About the 18650-Tester PCB

18650-Tester is an open source ESP32 PCB design by Studented0, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 150 mm, with 65 components from 19 distinct parts.

Its main chip is the ESP32-DevKitC-30PIN, from the ESP32 family. Other key parts include the TCA9548AMRGER, INA219AIDR and TP4056-42-ESOP8. By type, the board carries 16 LEDs, 10 ICs, 6 resistors, 4 transistors, 4 battery holders and 2 connectors.

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

From the project

Tests 18650 cells for voltage, internal resistance, capacity, and more.

A 4-channel 18650 battery analyzer. Tests up to 4 cells at once and measures voltage, capacity in mAh, and internal resistance per channel. Results show on a small OLED with a rotary encoder to navigate, and a WiFi dashboard to start and stop tests remotely/edit settings.

My science fair project was a 3S34P battery pack from 34 salvaged 18650 cells. I bought a cheap tester off Amazon to sort them but I wanted to know how it actually worked. I also wanted an excuse to learn PCB design. CellScan is the result, a two-layer PCB with SMD assembly through JLCPCB.

18650-Tester, from the project README
From the project README

Main components on the 18650-Tester

ESP32-DevKitC-30PINTCA9548AMRGERINA219AIDRTP4056-42-ESOP8

18650-Tester bill of materials (BOM)

65 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-DevKitC-30PIN
U1
1
TCA9548AMRGER
U2
4
INA219AIDR
INA219AxD
U3, U4, U5, U6
4
TP4056-42-ESOP8
U7, U8, U9, U10
4
IRLZ44N
Q1, Q2, Q3, Q4
1
OLED DISPLAY
J1
1
USB_C_Receptacle_PowerOnly_6P
J3
4
10k
BAT1.1, BAT2.1, BAT3.1, BAT4.1
4
1.2k
BAT1.2, BAT2.2, BAT3.2, BAT4.2
8
100nF
BAT1.3, BAT1.4, BAT2.3, BAT2.4, BAT3.3, BAT3.4, BAT4.3, BAT4.4
4
Battery_Cell
BT1, BT2, BT3, BT4
3
100NF
C
ENCC1, ENCC2, ENCC3
3
10K
10k
ENCR1, ENCR2, ENCR3
1
RotaryEncoder_Switch_MP
SW1
8
1k
BAT1GREEN1, BAT1RED1, BAT2GREEN1, BAT2RED1, BAT3GREEN1, BAT3RED1, BAT4GREEN1, BAT4RED1
4
GREEN
GREEN1, GREEN2, GREEN3, GREEN4
4
RED
RED1, RED2, RED3, RED4
4
2ohm 10watt
R1, R2, R3, R4
2
5.1K
5.5k
R5, R6

18650-Tester design files

The KiCad project lives in the Studented0/18650-Tester repository on GitHub; these links point at the commit this page was built from.

18650-Tester: common questions

What microcontroller does the 18650-Tester use?

The 18650-Tester is built around the ESP32-DevKitC-30PIN, from the ESP32 family.

How big is the 18650-Tester PCB?

The 18650-Tester measures 100 × 150 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 18650-Tester?

65 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the 18650-Tester design files?

From the Studented0/18650-Tester repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the 18650-Tester design in my own project?

Yes, under the terms of its MIT license, which Studented0 chose for the repository.

Can I test firmware for the 18650-Tester 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.

Similar boards