How to connect relay shield to arduino - 8-Channel Relay Driver Shield Freetronics
Note: There are 2 ways of powering relay shield when carried by an Arduino board. Connect 9VDC to Arduino board. Connect 9VDC.
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When output Digital 4 on your Arduino is low, the relay shield will connect the NC pin to the Common pin of the screw terminal. When output Digital 4 goes high.
I am wondering if this Arduino Relay Shield design would be good enough to handle 120v 1amp The transistor is a 2n4401. Also The Two capacitors on the other 3.
Arduino: How to wire a relay. if you want the relay to turn something off when signalling it from the Arduino, you must connect your application's power source.
The Arduino 4 Relays Shield is a solution for driving high power loads that cannot Relay 1 Arduino pin are routed on the Arduino TWI interface. Both connect