This project lets you detect the presence of AC voltage using a small circuit connected to a mobile device via a USB OTG cable. It lights up an LED when AC voltage is detected.
Components Required
- IC CD4017: A decade counter IC that helps control the LED indicator.
- Resistor (220Ω): Limits the current flowing to the LED to protect it.
- Zero PCB: A board to neatly connect all parts.
- Mobile OTG Cable: Connects the circuit to your mobile phone’s USB port.
- 22 Gauge Copper Wire (40 cm): Used as a sensor/probe to detect AC voltage.
- LED: Lights up to indicate AC voltage presence.
How It Works
- The copper wire acts as a sensor that picks up AC voltage signals nearby, without needing direct contact.
- The CD4017 IC counts the input pulses generated when AC voltage is sensed.
- The IC then switches on the LED as a visual indication that AC voltage is present.
- The circuit draws power from the mobile device’s USB port through the OTG cable, so no separate battery is needed.
- The resistor ensures the LED is safe and gets the right amount of current.
Watch the full video tutorial here: AC voltage detector with Mobile USB | CD 4017 | Make touchless AC voltage detector at Home