Im trying to make a simple remote controle without usng microcontroller. Im using RF Module 434MHz and Encoder HT12E and Decoder HT12D. Im using the basic crcuit as shown in datasheet of RF A 434. Ive alos reffered to the Circuit shown in dis link
Encoder and Decoder used is of 18 Pin.
Ive connected LEDS between Ground and D0, D1, D2, D3 on the Decoder in the Recieving side.
Im expecting that when I make connection of Ground and D0, D1, D2 or D3 one by one on Encoder in the Transmitting side, then corrosponding LED on the Recieving side would Glow.
But when I switch power on, then All four LEDS glow together after few seconds, even if Ive not make connection between ground and any of D0, D1, D2, D3.
Am I making some mistake in the concept that Im not able to realize?
Ive put LED on the VT pin of decoder and i expect that it should glow only if I make connection between the Ground and any of D0, D1, D2, or D3. But It randomly glows (rather flicker) even without that connection.
Im sorry If my question sounds silly, but Im new to Robotics, and ive searched for this on the forumns but couldnt find much.