there is a problem to transmit data from transmitter circuit. At the receiver side the vt pin of decoder ic(HT12d) is high, when transmitter circuit is powering up, but the data pin of decoder ic is kept high. although at transmit side we send zero signal. plz help
The receiver should work OK but the transmitter circuit is suspect.
First point: make sure the transmitted data rate and receiver data rate are the same.
Second point, the transmitter data inputs have internal pull-up resistors but your external transistors also pull the inputs to VCC, you need to pull the inputs low, not high to set a data pattern on them.
The receiver should work OK but the transmitter circuit is suspect.
First point: make sure the transmitted data rate and receiver data rate are the same.
Second point, the transmitter data inputs have internal pull-up resistors but your external transistors also pull the inputs to VCC, you need to pull the inputs low, not high to set a data pattern on them.