Relay Module 1 Arduino 37 in 1 Sensor Kit KY-019 5V

Relay Module 1 Arduino 37 in 1 Sensor Kit KY-019 5V
Arduino KY-019 Relay Module is used to control AC circuits, the relay acts as a switch that responds to a signal received from the Arduino, it has an integrated LED that indicates if the signal is high or low.
Commonly used in IoT projects to control lights and other electronic appliances.
The KY-019 consist of a 1MΩ resistor, a LED, a 1N4007 rectifier diode and a 5VDC relay capable of handling up to 250VAC and 10A.
On the DC side of the board there are 3 pins for signal, power and ground. On the AC side there are 3 contacts, NC (Normally Closed), Common and NO (Normally Open).
KY-019 Connection Diagram
For the DC part of the circuit connect S (signal) to pin 10 on the Arduino, also connect the Power line (+) and ground (-) to +5 and GND respectively.
On the AC side connect your feed to Common (middle contact) and use NC or NO according to your needs.
NO (Normally Open) will get power when (S) is high, NC (Normally Closed) gets disconnected when (S) is high.
Always be very careful when experimenting with AC, electrical shock can result in serious injures.
KY-019 Arduino AC Device
S Pin 10
+ +5V
- GND
NC
Common Feed In
NO Feed Out

TTL Control Signal 5VDC to 12VDC (some boards may work with 3.3)
Maximum AC 10A 250VAC
Maximum DC 10A 30VDC
Contact Type NC and NO
Dimensions 27mm x 34mm [1.063in x 1.338in]