Hey guys, I am trying to turn a light on and off via my arduino.
I'm following this tutorial http://www.glacialwanderer.com/hobbyrobotics/?p=9 but i have some questions
First off he is using a 1n4004 diode but i could only find a 1n4007 diode, would it be fine to use that instead?
Secondly I am using a jzc-11f relay , based on the bottom diagram i can see the bottom two contacts would be used with the diode but with the top three would i use the left middle and top right contacts or top left and top right contact (hope that made sense) for the live wire? (Im thinking left middle and top right, but i could be wrong)
Thanks for your help.
The bottom two connections are the coil you energize to activate the relay. One side will hook to the Arduino.
The switch in the relay is a single pole / double throw. Your input is on the single contact on the right side (top connection). The two contacts on the left are normally closed (NC) on the bottom (middle contact in this case) and normally open (NO) on the top. You most likely want to use the contact on the right side and the top left contact. This will be the 'switched' side between your power supply and load.
1N4004 = OK.
If you put the live wire to COM then the live voltage will be present on the NC terminal.
If you connect the live wire to NO (the top terminal in the dwg) and connect the switched end to COM, instead, you can avoid any "mishaps" when the coil is not energised.