Traditional voltmeters can be bulky and inconvenient for quick diagnostics, especially during on-site work or rapid prototyping. There is a need for a compact, portable solution that can measure both low and higher DC voltages while also allowing remote, real-time monitoring without being physically close to the device.
This project introduces IndusVoltmeter, a compact wireless voltmeter designed to measure voltages in two selectable ranges: 0–3.3V and 0–24V. The device uses an onboard ADC for low-voltage measurements and a voltage divider circuit for higher voltages, with readings displayed in real time through a Wi-Fi–based web interface and an optional OLED display.
Key Features
- Dual voltage measurement ranges: 0–3.3V and 0–24V
- Compact, palm-sized design for easy portability
- Wi-Fi connectivity with real-time voltage display on a webpage
- Web-based toggle to switch voltage ranges
- Optional OLED display for local, instant readings
- Protection features such as a reverse polarity diode, fuse, and noise filtering capacitor
Applications
- Quick voltage diagnostics in labs and fieldwork
- Portable troubleshooting tool for electronics projects
- IoT-based remote voltage monitoring
- Educational use for learning ADCs and voltage scaling
- Integration into compact diagnostic or testing kits
IndusVoltmeter demonstrates how a small, thoughtfully designed device can combine portability, flexibility, and wireless connectivity. By offering dual voltage ranges and real-time monitoring through a web interface, it serves as a practical and modern alternative to traditional handheld voltmeters for everyday electronics work.