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ASK AN EDUCATOR – “How can I measure AC voltage with my Arduino?” « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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Amazon.com: eboxer-1 Sense HAT for Raspberry Pi, Current Voltage Power Consumption Monitor, with 12 Bit ADC, 40Pin GPIO Extension Header and I2CSMBus Interface, Support Measure Bidirectional Current : Electronics
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