2 layers60 × 60 mm
Discharge tester
c3am/capacitest
A low cost single cell battery capacity tester based on using the ch32v003.
31 parts
2 layers68 × 60 mm
Bidirectional tester
c3am/capacitestA low cost single cell battery capacity tester based on using the ch32v003.
- Size
- 68 × 60 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 75
- Nets
- 48
- Pads
- 298
- Tracks, vias
- 414, 135
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Dec 2023
- Updated
- 2 Jun 2025
Overview
Bidirectional tester is an open-source printed circuit board by c3am, from the c3am/capacitest repository on GitHub. It is a 2-layer board of 68 × 60 mm with 75 parts on 48 nets, routed with 414 tracks and 135 vias.
It is built around the IR2101PBF, ADS1115IDGS and AMS1117-5.0, with the DS1307Z+ and 1N4148WS among its other parts. Its parts include 21 capacitors, 18 resistors, 10 ICs, 6 connectors and 4 diodes. It belongs with the RISC-V boards of this library.
Main components
5
IR2101PBF
PDIP-8-40℃~+125℃ 100ns 10V~20V 130mA 150ns 150uA 160ns 2 270mA 50ns Half-Bridge IGBT、MOSFET Under Voltage Protection PDIP-8 Gate Drivers ROHSInfineon TechnologiesGate Drivers
ADS1115IDGS
MSOP10Ultra-Small, Low-Power, 4 Channels 16-Bit Analog-to-Digital Converter with Internal ReferenceTexas InstrumentsUncategorised
AMS1117-5.0
SOT-223-40℃~+125℃ 1 1.3V 15V 1A 5V 60dB Fixed Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
DS1307Z+
SO-80℃~+70℃ 10nA 300nA 4.5V~5.5V Backup power management and battery charging、InsideSRAM/NVRAM、Programmable clock output External I2C SO-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
1N4148WS
SOD-3231.25V@150mA 100V 150mA 1uA@75V 200mW 2A 4ns Independent SOD-323 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching Diodes
README
README.mdcapacitest
A low cost dual cell battery capacity tester with an oled screen using the ch32v003 microcontroller.
discharge-tester (old version, unfinished)
In the discharge-tester directory is a pcb with mosfets used as variable resistors for discharging the cells. It uses LMV358's as current sense amplifiers across 1 Ohm current sense resistors. I did not get this setup to work, because the built-in adc gave me very jittery values. Maybe there is something wrong with my circuit, or you just have to software filter the adc values.
bidirectional-tester (current version, under development)
This is the newer version, which uses bidirectional buck-boost converters for charging the cells from an external ~12V battery/discharging them into that battery.
- ADS 1115 for current and voltage sensing
- ina181a2 + ref2020(2V Vref) for current sense amplification
- ir2101 low+high side mosfet drivers
- ceramic capacitors only
- the two bidirectional buck-/boost-converters each have 1uH SMD inductors, 200uF on the cell and 66uF capacitance on the ~12V battery side
- 0.9" i2c oled screen
development status/roadmap:
| step | status |
|---|---|
| schematic design | [done] |
| PCB design | [done] |
| get PCB and other components | [done] |
| assemble board | [...] |
| test board/write code | [not started] |
| if not working, repeat | |
| finalize code and put online | [not started] |
(last updated: 2025-05-08)
Parts
75| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10u | Capacitor_SMD:C_0603_1608Metric | C1, C3, C5, C7, C9, C16, C18, C19, C20, C21 |
| 9 | 100k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R6, R8, R9, R13, R14 |
| 6 | 22u | Capacitor_SMD:C_0805_2012Metric | C4, C8, C10, C11, C12, C13 |
| 4 | 100 | Resistor_SMD:R_0603_1608Metric | R10, R11, R15, R16 |
| 4 | 100u | Capacitor_SMD:C_1206_3216Metric | C2, C6, C14, C15 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | Q_NMOS_SGD | my-footprints:PQFN-8-EP_6x5mm_P1.27mm_Generic | Q1, Q2, Q3, Q4 |
| 4 | SW_SPST | my-footprints:switch | SW1, SW2, SW3, SW4 |
| 3 | Conn_01x02 | my-connectors:screw-terminal_5mm_x2 | J1, J5, J6 |
| 2 | 10m | Resistor_SMD:R_2512_6332Metric | R7, R12 |
| 2 | 1N4148WS | Diode_SMD:D_SOD-323 | D1, D2 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R17, R18 |
| 2 | 1u | Inductor_SMD:L_Changjiang_FXL0630 | L1, L2 |
| 2 | INA181 | Package_TO_SOT_SMD:SOT-23-6 | U3, U6 |
| 2 | IR2101 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5, U8 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D3, D4 |
| 2 | REF3020 | Package_TO_SOT_SMD:SOT-23 | U4, U7 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C17 |
| 1 | 300k | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | ADS1115IDGS | Package_SO:TSSOP-10_3x3mm_P0.5mm | U1 |
| 1 | AMS1117-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U9 |
| 1 | CH32V003FxUx | Package_DFN_QFN:QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm | U2 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | Conn_01x04 | modules:module-oled-0.9inch | J4 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | Crystal | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | DS1307Z+ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U10 |
The 74 most common of 75 parts.
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Questions
How big is the Bidirectional tester PCB?
It measures 68 × 60 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bidirectional tester use?
75 parts, built around the IR2101PBF, ADS1115IDGS, AMS1117-5.0 and DS1307Z+. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Bidirectional tester KiCad files?
From the c3am/capacitest repository on GitHub, at the commit this page was made from: the board is bidirectional-tester/bidirectional-tester.kicad_pcb and its schematic bidirectional-tester/bidirectional-buck-boost.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bidirectional tester design in my own project?
Its repository states no licence, so its author keeps all rights: ask c3am before reusing the design.