Tag: Relay

ESP32 Relay Board

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For another project, I needed relays to be able to switch a couple of pumps. This is where the ES32 boards caught my eye on AliExpress. They come completely ready to use and some even have a 240V power supply on board. CAUTION: Although the programming port on the boards is marked as 5V, the fact that my boards…

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Arduino 4-Relay Expansion Board

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Yet another mystery of an add-on board. Although there are many pages selling this board, I've only found exactly one video and one test example, which has never happened to me before. The board has 4 relays that can be controlled via pins 4-7. According to Reichelt, the relays can handle up to 240V…

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