USB Charger Doctor - In-line Voltage and Current Meter
USB pass-through dongle that measures voltage and current draw via a 0.05 Ω shunt resistor, displaying readings on a digital screen. Supports 3.5–7 V input and up to 3 A; alternates between voltage and current readouts every ~3 seconds. Data lines pass through unaffected.
Pinout
- USB-A plug VBUS
USB upstream power input measured by the Charger Doctor. Adafruit states the dongle plugs between a USB device, supports 3.5-7VDC input, and has a 0.05 ohm resistor in line with the power pin to measure current draw.
Type · powerVoltage · 3.5-7VDC input range from Adafruit product page; normal USB devices usually hover around 4.75-5.25V per source. - USB-A plug GND
USB upstream ground/reference for the inline USB power meter.
Type · ground - USB-A plug D+
USB upstream data line passed through by the inline meter. Adafruit states the device passes the data lines through and supports USB 1.x and 2.x data speeds.
Type · signal - USB-A plug D-
USB upstream data line passed through by the inline meter. Adafruit states the device passes the data lines through and supports USB 1.x and 2.x data speeds.
Type · signal - USB-A receptacle VBUS
USB downstream power output to the connected device, monitored for voltage and current by the inline meter.
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