2 layers28.3 × 39.8 mm
LevelShifter
gusmanb/logicanalyzer
24 channel, 100Msps logic analyzer hardware and software
21 parts5.1kGPL-3.0
2 layers95.3 × 78.7 mm
VoltageMeter
lwa-project/voltage_monitorSoftware for monitoring the voltage on 120VAC and 240VAC lines
- Size
- 95.3 × 78.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 47
- Pads
- 80
- Tracks, vias
- 72, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 24 Mar 2020
- Updated
- 26 Mar 2026
Overview
VoltageMeter is an open-source printed circuit board by lwa-project, from the lwa-project/voltage_monitor repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 95.3 × 78.7 mm with 21 parts on 47 nets, routed with 72 tracks and 0 vias.
Its parts include 4 resistors, 2 diodes, 2 connectors and 2 fuses. It belongs with the AVR (ATmega, ATtiny) boards of this library.
README
README.mdLine (Voltage) Monitoring Software
This directory contains a collection of software for interfacing with a Arduino connected to a custom PCB for monitoring AC line voltage.
This software depends on the following python modules:
- pySerial
- backports.zoneinfo (Python < 3.9 only)
- wxPython
Contents
lvmb.py - Python module for interfacing with the Arduino and reading the voltage.
lineMonitor.py - Python script for logging line voltages.
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole_3.7mm_Pad | MountingHole:MountingHole_3.7mm_Pad | REF1, REF2, REF3, REF4 |
| 2 | 10k | Potentiometer_THT:Potentiometer_Piher_PT-15-H05_Horizontal | RV1, RV2 |
| 2 | 120k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4 |
| 2 | 665k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 2 | B40C5000-3x00A | Diode_THT:Diode_Bridge_Vishay_GBL | D1, D2 |
| 2 | Conn_01x02_Male | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J1, J2 |
| 2 | Fuse | Fuse:Fuse_Littelfuse-LVR100 | F1, F2 |
| 2 | TRANSF6 | VoltageMeter:4900-XXXXRA60 | TR1, TR2 |
| 1 | Arduino_Nano_v3.x | VoltageMeter:Arduino_Nano | A1 |
| 1 | LOGO | VoltageMeter:LWA_Logo_Small_Silkscreen | G*** |
| 1 | Symbol_HighVoltage_Type2_CopperTop_VerySmall | Symbol:Symbol_HighVoltage_Type2_CopperTop_VerySmall | REF5 |
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Questions
How big is the VoltageMeter PCB?
It measures 95.3 × 78.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the VoltageMeter use?
21 parts. 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 VoltageMeter KiCad files?
From the lwa-project/voltage_monitor repository on GitHub, at the commit this page was made from: the board is VoltageMeter/VoltageMeter.kicad_pcb and its schematic VoltageMeter/VoltageMeter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the VoltageMeter design in my own project?
Its repository publishes it under the GPL-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).