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.
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.
USB upstream ground/reference for the inline USB power meter.
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.
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.
USB downstream power output to the connected device, monitored for voltage and current by the inline meter.
USB downstream ground/reference for the connected device.
USB downstream data line passed through to the connected device.
USB downstream data line passed through to the connected device.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| USB-A plug VBUS | power | 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. | 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 | ground | USB upstream ground/reference for the inline USB power meter. | ||
| USB-A plug D+ | signal | 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. | ||
| USB-A plug D- | signal | 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. | ||
| USB-A receptacle VBUS | power | USB downstream power output to the connected device, monitored for voltage and current by the inline meter. | 3.5-7VDC working range, up to 3A current, from Adafruit product page. | |
| USB-A receptacle GND | ground | USB downstream ground/reference for the connected device. | ||
| USB-A receptacle D+ | signal | USB downstream data line passed through to the connected device. | ||
| USB-A receptacle D- | signal | USB downstream data line passed through to the connected device. |
Over 120 parts spanning pocket oscilloscopes, logic analyzers, RF and semiconductor analyzers, multimeters, soldering tips and consumables. DSO Quad and Miniware's 4-channel scope cover waveforms; Kingst LA5016 and ScanaQuad handle logic capture.
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