psense

USB interfaced, 2-channel current + voltage meter.

Schematic

Schematic PDF here

Parts

USB

• USB to I2C interface
• bus powered, no external crystal needed

http://www.mouser.com/ProductDetail/Microchip-Technology/MCP2221A-I-SL

Meter

• 2 channel current + bus voltage (0-40V)
• I2C interface
• adjustable range +/-10mV, 20mV, 40mV, 80mV

http://www.mouser.com/ProductDetail/Microchip/PAC1720-1-AIA-TR