[SOLVED] Wireless Receiver Decoder (HT12D) pins go high at device start-up

[speedEC]

Dear All,

I have connected Wireless Receiver to PIC18F452 thro' the VT(Valid Transmission) pin of decoder (HT12D). When I start (Power-on) the Wireless Transmitter the VT pin of decoder also goes high and Light-up the LED which is connected to the PIC MCU. But, not always and only sometimes. The VT pin should go high only when the TE pin of encoder goes low. How can I rectify this? NOTE: I have given the power from single source to both Transmitter and Receiver.

Thanks
PMK

 

[speedEC]

I forgot to add 0.1uF capacitor to my circuit for surge protection. Now, everything works fine.