4 layers65 × 30 mm
Elec gripette hub and dyn
pollen-robotics/elec_grabette
Set of electronic boards for Grabette/Gripette
122 parts11Apache-2.0
2 layers40 × 65 mm
Wifi voltmeter
makerspacelt/wifi-voltmeter2Dev NOTE: before commit, run ./kibot.sh to regenerate documentation, bom, gerbers and other assets.
- Size
- 40 × 65 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 60
- Nets
- 46
- Pads
- 150
- Tracks, vias
- 305, 126
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 24 Jun 2019
- Updated
- 7 Apr 2026
Overview
Wifi voltmeter is an open-source printed circuit board by makerspacelt, from the makerspacelt/wifi-voltmeter repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 40 × 65 mm with 60 parts on 46 nets, routed with 305 tracks and 126 vias.
It is built around the HX711, 24C02S and BAV99, with the AO3400A and AO3401A among its other parts. Its parts include 23 resistors, 8 capacitors, 4 diodes, 4 transistors and 3 ICs. It belongs with the radio and wireless boards and the ESP32 and RISC-V boards of this library.
Main components
5
HX711
SOP-16-40℃~+85℃ 1.4mA 10Hz、80Hz 1MHz~20MHz、11.0592MHz 2 2.6V~5.5V 20mV、40mV、80mV 24 Built-in External、Built-in SPI Support Yes SOP-16 Analog to Digital Converters (ADC) ROHSAvia SemiconAnalog To Digital Converters (ADC)
24C02S
SOT-23-5SOT-23-5 EEPROM ROHSGAOGE MICROCHIPEEPROM
BAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching DiodesAO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsAO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
README
README.md
About
This device should be cheap voltmeter/logger via MQTT/LXI.
Basic target features:
- standard pitch bannana connectors for measurement
- reasonable reading speed, at least 3 per second
- should not blow up @ 1000V (usualy)
- accuracy at least 2%
- 99999 count noise free resolution
- 2x user programmable buttons
- 128x64 OLED display
- Powered via USB-C
- Compatibility with esphome and Home Assistant
Dev NOTE: before commit, run ./kibot.sh to regenerate documentation, bom, gerbers and other assets.
Parts
60| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C5, C7, C8 |
| 4 | 220k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4 |
| 4 | 2k2 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12, R16, R17, R19 |
| 4 | BAV99 | Package_TO_SOT_SMD:SOT-23 | D1, D2, D3, D4 |
| 3 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R20, R21, R24 |
| 3 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 3 | MP | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C6 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R18 |
| 2 | 180k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R23, R25 |
| 2 | USR_BTN | Button_Switch_SMD:SW_SPST_TL3342 | SW1, SW2 |
| 1 | 10 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 1 | 200k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R22 |
| 1 | 22 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
| 1 | 220 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10 |
| 1 | 24C02S | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | 68 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 1 | 680 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11 |
| 1 | 6k8 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q4 |
| 1 | CAL-WP | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | COM | -local:SolderWirePad_1x01_SMD_5x10mm | J2 |
| 1 | G*** | kibuzzard-69D37E5E | kibuzzard-69D37E5E |
| 1 | G*** | kibuzzard-69D37B8E | kibuzzard-69D37B8E |
| 1 | G*** | kibuzzard-69C5DC72 | kibuzzard-69C5DC72 |
| 1 | HX711 | Package_SO:SOP-16_4.4x10.4mm_P1.27mm | U3 |
| 1 | LOGO | -local:qr | G*** |
| 1 | LOGO_KMS | -local:logo_kms_small_silkscreen | G2 |
| 1 | Logo_Open_Hardware_Large | Symbol:OSHW-Symbol_6.7x6mm_SilkScreen | G1 |
| 1 | PIN1 | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | PIN2 | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | V | -local:SolderWirePad_1x01_SMD_5x10mm | J1 |
| 1 | bead | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1 |
| 1 | esp32-c3-supermini | -local:esp32-c3-supermini | U2 |
| 1 | ssd1306 oled | -local:oled_i2c_1.3_128x64_ssd1306 | J3 |
Questions
How big is the Wifi voltmeter PCB?
It measures 40 × 65 mm and has 2 copper layers, 0.8 mm thick.
What parts does the Wifi voltmeter use?
60 parts, built around the HX711, 24C02S, BAV99 and AO3400A. 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 Wifi voltmeter KiCad files?
From the makerspacelt/wifi-voltmeter repository on GitHub, at the commit this page was made from: the board is project/project.kicad_pcb and its schematic project/_adc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wifi voltmeter design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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