The “Cheapo” Ammeter

cheapo-ammeter-002Figure 1: The “cheapo” ammeter for keeping tabs on SoC/SBC power usage.

I have a number of SoC/SBC based “homemade tablets” and “homemade server” boxes that consume anywhere from 300 mA to several amps at 5 VDC.  I wanted an easy way to check the power consumption under various load scenarios (GPU=on versus GPU=off, WiFi=on versus WiFi=off, eight cores versus four cores versus one core, etc).

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