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I am using my RF module to send a High signal to relay but just once by a push button.As soon as I release it the Relay goes to NC . How can I Fix it to stay at NO . I thought of using a Flip-Flop.

A.Tiwari
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  • What is your desired behavior? You want to send one pulse and have it stay on... until what? Forever? Power is removed? Another pulse? Generally what you're describing is referred to as a latch, but without a specific description of the desired behavior it's not possible to give you an exact answer. – Chuck Oct 19 '16 at 20:28
  • Sir I will send pulse once to move relay at NO and send another pulse to move it to NC.like using a remote for a car. – A.Tiwari Oct 19 '16 at 23:01

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Yes, that is a very good way to go...

you can use a t flip flop so you the q output can hold the relay in the state you need and can toogle every time you press the button..

here the T flip flip, your signal every time you press the button must be connected to the clock

enter image description here

and the output signal diagram looks like

enter image description here

Edit

you can replace the flip flop with its equivalent nand gates

enter image description here

or even more, considering that every nand gate can be schematizied with diodes like

but as you can see you will need more more elements and more place on the main board if you really want to replace the flipflop

enter image description here

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