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Detecting and controlling mains voltages with a Raspberry Pi or Arduino | Experiments using a Raspberry Pi and solid state relays (SSRs) to sense the presence of mains electricity and switch loads
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Raspberry Pi 3 UL-listed Power Supply 5V 3A Charger with 1.5m Extra Long Micro USB Cable (On Off Power Switch) - MakerSpot
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Raspberry Pi 4 Official 15W Power Supply US - Black; 5.1V / 3.0A DC output; 96-264Vac operating input range; Short - Micro Center
RPI Core - AA Battery Powered Raspberry Pi3 B+ using the RPI Core INA219 Power Monitor which also monitors input voltage and current via I2C protocol Raspberry Pi #raspberrypi | Facebook
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power - Powering the Pi 4 - safe voltage levels and current requirements - Raspberry Pi Stack Exchange
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