![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 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](https://pdcastro.github.io/mains-io/assets/img/mains-io-drawing.png)
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
![Raspberry Pi GPIO Sensor Module Voltage Detection AD DA Digital to Analog Conversion Expansion Board for Raspberry Pi 4B/3B+/3B|Demo Board Accessories| - AliExpress Raspberry Pi GPIO Sensor Module Voltage Detection AD DA Digital to Analog Conversion Expansion Board for Raspberry Pi 4B/3B+/3B|Demo Board Accessories| - AliExpress](https://ae01.alicdn.com/kf/H433737e40f1b45eea72f61ea923df5adO/Raspberry-Pi-GPIO-Sensor-Module-Voltage-Detection-AD-DA-Digital-to-Analog-Conversion-Expansion-Board-for.jpg_Q90.jpg_.webp)
Raspberry Pi GPIO Sensor Module Voltage Detection AD DA Digital to Analog Conversion Expansion Board for Raspberry Pi 4B/3B+/3B|Demo Board Accessories| - AliExpress
![Amazon.com: 4-CH Current/Voltage/Power Monitor HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/W, I2C/SMBus Interface Onboard 0.1Ω 1% Sampling Resistor Measure Bi-Directional Current up to 3.2A Embed 12-bit ADC : Electronics Amazon.com: 4-CH Current/Voltage/Power Monitor HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/W, I2C/SMBus Interface Onboard 0.1Ω 1% Sampling Resistor Measure Bi-Directional Current up to 3.2A Embed 12-bit ADC : Electronics](https://m.media-amazon.com/images/I/81U4VUaOIkL.jpg)
Amazon.com: 4-CH Current/Voltage/Power Monitor HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/W, I2C/SMBus Interface Onboard 0.1Ω 1% Sampling Resistor Measure Bi-Directional Current up to 3.2A Embed 12-bit ADC : Electronics
![Sense HAT for Raspberry Pi, Current Voltage Power Consumption Monitor, with 12 Bit ADC, 40Pin GPIO Extension Header and I2C/SMBus Interface, Measure Bidirectional Current : Amazon.ca: Industrial & Scientific Sense HAT for Raspberry Pi, Current Voltage Power Consumption Monitor, with 12 Bit ADC, 40Pin GPIO Extension Header and I2C/SMBus Interface, Measure Bidirectional Current : Amazon.ca: Industrial & Scientific](https://m.media-amazon.com/images/I/71miLmOKS3L._AC_SY355_.jpg)
Sense HAT for Raspberry Pi, Current Voltage Power Consumption Monitor, with 12 Bit ADC, 40Pin GPIO Extension Header and I2C/SMBus Interface, Measure Bidirectional Current : Amazon.ca: Industrial & Scientific
![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 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](https://m.media-amazon.com/images/I/71miLmOKS3L.jpg)
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
![Under-voltage detected! (0x00050005) spams dmesg on new kernel 4.14.30-v7+ · Issue #2512 · raspberrypi/linux · GitHub Under-voltage detected! (0x00050005) spams dmesg on new kernel 4.14.30-v7+ · Issue #2512 · raspberrypi/linux · GitHub](https://user-images.githubusercontent.com/194392/38975506-be12b982-43b6-11e8-8ed6-6b2bb2ce2f6f.png)