Impulse relay turns on with an electrical impulse at the control input and turns off again with another impulse.

Also it is pretty easy to make your own programmer, or you can program the ESP-01 module with the help of the Arduino IDE ... Seemingly, this ESP-01 Wi-Fi Relay can be used as a smart on/off switch ...

Note that the onboard LED indicator of the SIM800L module will blink once every ... The relay contacts can be wired as desired to switch any suitable electrical load. That’s all! /* * SIM800L SMS ...

[Jason] really wanted to build an RFID controlled garage door opener and decided to turn to Arduino ... is also a DIP switch that allows the user to select how long the relay circuit should ...

Instead, he drew up a simple schematic that used an Arduino Nano, an FM radio module based on the TEA5767 ... The AM-FM selector knob was fitted with a micro-switch connected to the Arduino ...