I am following the following circuit for RF Communication. When I set the /TE pin in HT12E low the VT pin in HT12D doesnt go high as expected and also there is no change (no output at D0~D3 pins in HT12D).I am stuck here not able to figure out the problem . Please help me!
The link here http://www.engineersgarage.com/electronic-circuits/dc-motor-control-circuit-wireless-rf contains description the description . Thank you !
Hi Gagan,
Connect the pins A0 to A7 on both ht12e and ht12d to their grounds, and I hope the problem will be solved.
Hi Gagan,
1. The address lines(A0-A7) at HT12E & HT12D should be same i.e. insted of keeping them floating connect them to ground.
2. TE(Transmit Enable Pin) pin at HT12E should be connected to ground before you press any switch at data pins. Alternately try connecting the TE pin to ground always.
Hi,
1. I have now tried grounding A0~A7 pins both on HT12E & HT12D and set TE to ground but it doesnt seems to be working.
2. I connected the circuit on breadboard without the encoder and decoder , a switch at DATA pin of the transmitter, and an LED at pin 7 ( also named pin 2 in some datasheets ).
3. Whenever i turn on the switch and provide 5V at data I can see a glitch in the glowing LED which tells that RFmodule is working . I need to figure out the problem.
4. How can i test if the encoder and decoder are working?
Please help !
Put the switch on TE button to ground, set the data and then release the TE button. Note that when the switch at the TE pin is open the pin will be floating. There is no guarantee that you will get a 5V at the TE pin. So I suggest you to use a pull up resistor of not less than 10K at the TE pin.
As far as I've experienced, the output at the receiver will remain high as long as the input at the transmitter is high. If your are getting only a glitch and not a continous output at the receiver when your input at the transmitter is on, there might be something wrong with the transmitter.
You can test the encoder and decoder module by directly connecting them with a piece of wire. All the connections should be the same for the encoder and decoder and both can be powered by a single power supply.