Conventional ammeters and energy meters are often bulky, require multiple probes, and lack portability for quick field measurements. Multimeters, while versatile, are not optimized for continuous energy monitoring, real-time frequency measurement, or compact embedded applications. There is a clear need for a smaller, smarter, and more intuitive measurement device without compromising functionality.
A coin-sized portable Ammeter and Energy Monitor, just 3.3 cm in diameter, powered by the IndusBoard Coin with an ESP microcontroller. This DIY device delivers advanced electrical measurement capabilities—matching and even exceeding traditional multimeters—within an ultra-compact and portable form factor.
Key Features
- Ultra-compact coin-sized design for true portability
- Real-time AC and DC current measurement using the ACS712 sensor
- Energy consumption calculation for both AC and DC loads by entering voltage
- AC frequency measurement capability
- Touch-based mode switching using the IndusBoard Coin’s capacitive touch pin
- OLED display for clear, real-time readings
- Battery-powered operation for standalone use
- Multiple measurement modes accessible through a single touch interface
Applications
- Portable electrical testing and diagnostics
- DIY electronics and embedded system projects
- Energy monitoring for small loads and appliances
- Educational tools for learning current, energy, and frequency measurement
- Field testing where traditional multimeters are impractical
This coin-sized Ammeter and Energy Monitor proves that powerful electrical measurement doesn’t need bulky hardware. By combining smart sensing, touch-based interaction, and real-time display within the IndusBoard Coin ecosystem, the project offers a practical, modern alternative to traditional meters—perfect for makers, students, and engineers who value portability without sacrificing capability.