Can I use single RF Receiver module ?

[milan.rajik]

My system is a wireless system. I have two transmitters which have HT12E with address selection through DIP switchs. Each transmitter board can send its data simultaneously. My question is, Can I use single 433 MHz RF receiver module at receiver and feed its DOUT to two HT12D circuits with address selection through respective DIP switches or should I use two RF 433 MHz receiver modules, one for each HT12D circuit ?

 

[Genovator]

You need 2 different receivers for different transmitters. HT12D cannot differentiate between two different transmission data. Both data received by a single 433MHz receiver will be mixed up.
You can use single receiver only if you can make sure any one transmitter transmits at a time.

Working on single frequency but with many transmitters & receivers requires "Listen before talk" technology, similar to CAN.

 

[milan.rajik]

You can use single receiver only if you can make sure any one transmitter transmits at a time

The D8-D11 the 4 inputs of HT12E are connected to 4 switches. I want to know whether HT12E transmits data only when there is a change in inputs are will it be transmitting the Data pins status every few mill seconds.

 

[Genovator]

As per the datasheet, HT12E will keep transmitting data as long as you keep the TE pin low. Gap between each 12 bit data will be 1/3rd of a single bit, depending on oscillating frequency.