So in this arduino relay control tutorial we will simply learn How to interface a Relay with Arduino. Here we are not using any Relay Driver IC like ULN2003 and will only use an NPN transistor to ...

This code sets the variable "relay_pin" to 7, which means that the relay is connected to digital pin 7 on the Arduino Uno. void setup() { pinMode(relay_pin,OUTPUT); } In the setup() function, the ...

👉 The lock is not directly connected with the Arduino instead of it we use a relay module. 👉 You can found these types of locks on the doors, safes, and cupboards nowadays. you need to interface one ...

(https://store.ncd.io/product/16-channel-general-purpose-spdt-relay-controller-with-i2c-interface/) This Sample code can be used with Arduino. Hardware needed to ...

is also attached to the interface circuit. With the help of this relay, it is easy to energize other (external) high-power blinkers or beepers, if necessary. // PANIC ALARM - ARDUINO // // by ...