When the button is pressed the Arduino board will put pin 2 in HIGH state, meaning 5V on pin 2. This voltage is used to drive the transistor that will switch ON the relay and the load (in our case the ...

If so, remember to connect the VCC pin to 5V of the Arduino board to enable the control input pins IN1 and IN2. Also note at this point that, if you want perfect galvanic-isolation, do not link ...

Posted in Arduino Hacks, clock hacks, home hacks, Microcontrollers Tagged astronomic, automation, garden, relay, rtc ← Recreate A PCB With A Scanner And Inkscape Unbricking A Router With A Raspi → ...

5V solenoid water valve + relay. Workflow: Arduino checks moisture and sends readings to the Pi. A Python script on the Pi decides when to open the valve. Use systemd to run the monitoring script as a ...