USB Phone Charger Monitor Kit with Arduino Uno: See Exactly How Fast Your Phone Charges

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Ever plugged in your phone and wondered if it’s really fast-charging? This kit turns an Arduino Uno into a dedicated USB charging monitor. Using the INA219 sensor, measure real-time current flowing into any device, then display charge rate and estimated time to full on a 16x2 LCD. A practical weekend project that answers a common question with real data.

What You'll Build

A portable monitor that sits between your charger and device. Read charging current in milliamps for any phone, tablet, or power bank. The LCD updates live, showing current and a countdown to full charge based on customizable battery capacity. You'll end up with a gadget that reveals how fast your devices really charge.

What You'll Learn

• How to interface the INA219 high-side current sensor over I2C
• Converting raw sensor readings into milliamps and calculating power (watts)
• Driving a 16x2 LCD with an I2C backpack for clean text output
• Programming conditional logic to estimate remaining charge time based on measured current

Kit Contents