4 layers157 × 100 mm
Spr23e bmu
derlucae98/spr23e-bmu
Battery Management Unit for the Scuderia Mensa SPR23e/SPR24e electric race car
433 parts1MIT
2 layers86 × 80 mm
Stromwaechter
generationmake/Stromwaechter_PCBPCB with current sensors for 12 V battery systems
- Size
- 86 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 132
- Nets
- 56
- Pads
- 410
- Tracks, vias
- 1,085, 118
- Pours
- 20
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 1 Sep 2025
- Updated
- 1 Sep 2025
Overview
Stromwaechter is an open-source printed circuit board by generationmake, from the generationmake/Stromwaechter_PCB repository on GitHub. It is a 2-layer board of 86 × 80 mm with 132 parts on 56 nets, routed with 1,085 tracks and 118 vias.
It is built around the ESP-WROOM-02U, BME680 and DS18B20, with the TCA9534PW, TPS54335ADDA and ITS4200S-ME-P among its other parts. Its parts include 70 resistors, 26 capacitors, 13 ICs, 11 connectors and 5 diodes. It belongs with the ESP8266 boards of this library.
Main components
6
ESP-WROOM-02U
SMD,18x14.3mm-40℃~+85℃ -98dBm 170mA 2.4GHz 2.7V~3.6V 20.5dBm 56mA ESP8266EX IPEX interface UART、SPI、I2C、I2S SMD,18x14.3mm WiFi Modules ROHSEspressif SystemsWiFi Modules
BME680
LGA-8-40℃~+85℃ 0.12hpa 0.6hpa 1.3pa/K 1.71V~3.6V 150nA 30Kpa~1.1bar I2C、SPI Temperature Sensor LGA-8 Pressure Sensors ROHSBosch SensortecPressure Sensors
DS18B20
TO-92-55℃~+125℃ 12bit 3V~5.5V 750ms Single-bus ±0.4℃ TO-92 Temperature Sensors ROHSUMWTemperature Sensors
TCA9534PW
TSSOP-16-40℃~+85℃ 1.5uA 1.65V~5.5V 10mA 25mA 4.1V 400kHz 500mV 8 8 I2C Interrupt Output Push-Pull Reset function、Cascade and address expansion、Built-in LED driver TSSOP-16 I/O Expanders ROHSTexas InstrumentsI/O Expanders
TPS54335ADDA
SO-8-40℃~+150℃@(TJ) 1 1.5MHz 310uA 3A 4.5V~28V 800mV~24V Adjustable Buck Buck Built-in Yes SO-8 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
ITS4200S-ME-P
SOT-223-4-40℃~+125℃ 1 1.4A 11V~45V 150mΩ Active High High Side Switch Short-Circuit Protection(SCP)、Over Voltage Protection、Overcurrent Protection(OCP)、Over Temperature Protection SOT-223-4 Power Distribution Switches ROHSInfineon TechnologiesPower Distribution Switches
README
README.mdStromwaechter
current and voltage monitor and power distribution for 12 V battery systems.
Stromwaechter on the left connected via WiFi to a Raspberry Pi 3 running OpenHAB on the right.
Introduction
Stromwaechter is a pcb intended for power distribution and monitoring in remote hamradio stations. It has four channels with a dedicated fuse and a switch for each channel. On each channel current and voltage is monitored. The data is collected by an ESP8266 and transmitted via WiFi using the MQTT protocol. The board is intended to be used with a pc running OpenHAB for visualisation and logging but it may also be connected to any MQTT server.
Hardware
The Stromwaechter has 4 output channels. Each channel can be switched by an Infineon ITS4200S. This IC has an internal over current and short circuit protection. Additionally each channel is protected by an ATO blade fuse. Also each channel has an TI INA226 to measure voltage and current on each channel. This allows to measure current in the range of -4.096 A to +4.096 A.
Limitations
The stromwaechter PCB is intended to monitor current flowing from the bus connector to loads connected on each channel. It is also possible that current flows in the reverse direction from the output to the bus. In this case the internal short circuit and over current protections of the ITS4200S don't work anymore and there is a 600 mV voltage drop across the ITS4200S because of its internal diode.
License
The hardware is released under CERN OHL v1.2
Software
You can find the software on github: https://github.com/generationmake/stromwaechter The software is released under GPL v3
Parts
132| Qty | Value | Footprint | References |
|---|---|---|---|
| 62 | R_0603 | resistors:R_0603 | R1, R2, R10, R11, R12, R13, R14, R15, R16, R19, R20, R23, R24, R25, R26, R27 +46 |
| 16 | C_0603 | capacitors:C_0603 | C3, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20 |
| 8 | C_0805 | capacitors:C_0805 | C1, C2, C4, C5, C21, C22, C23, C24 |
| 8 | R_1210 | resistors:R_1210 | R17, R18, R21, R22, R39, R40, R43, R44 |
| 7 | CONN_01X01 | MECH_wuerth_press-fit:WP-BUTR_7461084 | P4, P5, P6, P7, P8, P9, P10 |
| 5 | Led_Small | LEDs:LED_0603 | D1, D2, D3, D4, D5 |
| 4 | F_Small | fuse_holders_and_fuses:Fuseholder_ATO_Blade_littlefuse_Pudenz_2_Pin | F1, F2, F3, F4 |
| 4 | INA226 | SSOP:MSOP-10_3x3mm_Pitch0.5mm | U7, U8, U11, U12 |
| 4 | ITS4200S-ME | SOT_TO:SOT-223 | U5, U6, U9, U10 |
| 2 | CP_Small | capacitors:c_elec_5x5.8 | C25, C26 |
| 2 | SW_PUSH | mechanical-switches:smd_push | SW1, SW2 |
| 1 | 691382010002 | CON_wuerth:WR-TBL_691382010002 | CN1 |
| 1 | 74437346220 | L_power:WE-LHMI70xx | L1 |
| 1 | BME680 | IC_sensor:BME680 | U3 |
| 1 | CONN_01X03 | pin_headers:Pin_Header_Straight_1x03 | P1 |
| 1 | CONN_01X04 | pin_headers:Pin_Header_Straight_1x04 | P2 |
| 1 | CONN_01X06 | pin_headers:Pin_Header_Straight_1x06 | P3 |
| 1 | DS18B20 | SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U4 |
| 1 | ESP_WROOM_02 | MODULE_compute:ESP-WROOM-02 | U2 |
| 1 | TCA9534 | SOIC:SOIC-16_7.5x10.3mm_Pitch1.27mm | U13 |
| 1 | TPS54335A | SOIC:SOIC-8-1EP_3.9x4.9mm_Pitch1.27mm | U1 |
Questions
How big is the Stromwaechter PCB?
It measures 86 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Stromwaechter use?
132 parts, built around the ESP-WROOM-02U, BME680, DS18B20 and TCA9534PW. 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 Stromwaechter KiCad files?
From the generationmake/Stromwaechter_PCB repository on GitHub, at the commit this page was made from: the board is kicad_source/stromwaechter.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stromwaechter design in my own project?
Its repository states no licence, so its author keeps all rights: ask generationmake before reusing the design.
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