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...where a bunch of geeks got together to make other people's ideas come to life.
This board from Pololu is a simple carrier of Allegro's 75A ACS709 Hall effect-based linear current sensor with overcurrent fault output, which offers a low-resistance (~1.1 mΩ) current path and electrical isolation up to 2.1 kV RMS.
The sensor has optimized accuracy for currents from -37.5 to 37.5 A, and the analog voltage output is linear for current magnitudes up to 75 A. The ratiometric output voltage is centered at VCC/2 and has a typical error of ±2%. It operates from 3 to 5.5 V, so it can interface directly to both 3.3 V and 5 V systems.