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Battery capacity meter

ikatkov·battery-capacity-meter·kicad/battery-capacity-meter-2024.kicad_pcb

Battery capacity meter PCB layout, top view — open source AVR/Arduino board by ikatkov

About the Battery capacity meter PCB

Battery capacity meter is an open source AVR/Arduino PCB design by ikatkov, published on GitHub. It is a 2-layer board measuring 100 × 99.9 mm, with 68 components from 46 distinct parts.

Its main chip is the Arduino_pro_mini, from the AVR/Arduino family. Other key parts include the LM2596_STEPDOWN_MODULE, LM358, TM1637DISPLAY, AO3406 and TL431LP. By type, the board carries 27 resistors, 9 ICs, 8 diodes, 7 capacitors, 4 transistors and 3 connectors.

It belongs with the power & battery designs in this gallery.

From the project

Vref pin on Arduino Pro Mini breakout board is not on any pin, solder a wire to capacitor between pins 12 and 13. To the pin13 end.

Vref pin on Arduino Pro Mini breakout board is not on any pin, solder a wire to capacitor between pins 12 and 13. To the pin13 end.

Manufactured PCBs have a defect, bridge these tracks see manufactured-pcb-defect.png

Here is an example of which letters are possible

A,b,C,c,d,E,F,g,G,H,h,i,I,j,L,l,n,N,O,o,P,q,r,S,t,U,u,y

* The final PCB layout that I ordered from https://jlcpcb.com/ is not great. This is my almost first attempt to really use two sides with a lot of vias. Maybe next time use the lower side for horizontal signal traces and the top side for vertical?

Battery capacity meter, from the project README
From the project README

Main components on the Battery capacity meter

LM2596_STEPDOWN_MODULELM358TM1637DISPLAYAO3406TL431LPArduino_pro_miniTP4056

Battery capacity meter bill of materials (BOM)

68 components, 46 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LM2596_STEPDOWN_MODULE
LM2596_StepDown_Module
U1
1
LM358
U2
1
TM1637DISPLAY
TM1637Display
U3
3
AO3406
U5, U9, U10
1
TL431LP
U6
1
Arduino_pro_mini
U7
1
TP4056
U8
1
2N3904
Q1
1
2N3906
Q2
1
2SD2390
Q3
1
X0402MF
Q6
1
Conn_MainBoard
J3
1
Conn_DisplayBoard
J4
1
PWR
J5
1
PIN20
Pin20
AREF1
1
Buzzer
BZ1
1
Charger
Battery1
2
500
RV1, RV2
1
CHARGE/DISCHARGE
SW1
1
1A MODE
SW2
Show 26 more
QtyPartRefs
2
1A
TH1, TH2
1
ISet
TP1
1
1N4004
D1
2
1N4148
D2, D6
1
CHARGE
D3
1
1A
D4
1
1N4732A 4.7V
D5
2
BAT54S
D7, D9
1
10N
10n
C1
1
100N
100n
C2
2
10U
10u
C4, C6
1
1u
C5
1
100P
100p
C8
1
10U
10u
C9
1
0.2-0.5R
R1
11
10K
10k
R2, R6, R7, R8, R10, R11, R20, R21 +3
2
2.2K
2.2k
R3, R4
4
1k
R5, R9, R15, R18
1
1R
R12
2
470
R13, R16
1
2k
R14
1
680
R17
1
3k
R19
1
R100
R23
1
150R
R26
1
1M
R27

Battery capacity meter design files

The KiCad project lives in the ikatkov/battery-capacity-meter repository on GitHub; these links point at the commit this page was built from.

Battery capacity meter: common questions

What microcontroller does the Battery capacity meter use?

The Battery capacity meter is built around the Arduino_pro_mini, from the AVR/Arduino family.

How big is the Battery capacity meter PCB?

The Battery capacity meter measures 100 × 99.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Battery capacity meter?

68 components, from 46 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 Battery capacity meter design files?

From the ikatkov/battery-capacity-meter 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 Battery capacity meter design in my own project?

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

Can I test firmware for the Battery capacity meter without the hardware?

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

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