rf communication using atmega8

[harsha.sreevatsa]

were using an arduino uno and another atmega8 for this project…  we have rf receiver and transmitter 433.92mhz

ht12e and ht12d encoder decoder pair… wen we send some data in the transmitter and check the voltage at the 4 data pins they function perfectly .. they become high and low for the corect input but wen we check the voltage at the decoder data(4)  pins it just reads 0 volts.. but the data pins on the receiver read itself read 3.8 and sometimes 4 volts..

1)is my ht12d IC not working????

2)if its working why iam not getting back wat ive transmitted???

any help is sincerly appreceated….

[GANEEV SINGH]

Hi there

It could be, that your IC is not working but before replacing it with another make sure that you have assigned both encoder and decoder the same 8-bit address. Also check out for the valid transmission(VT) pin, while testing. It is the 17th pin of HT12D IC and it gows high each time it receives a valid data from its paired encoder. Further, see whether you have provided this IC with a proper resistor value, between its osc1 and osc2 pins, or not. Check out its datasheet for the resistor value. 

Hope this helps

[Ashutosh Bhatt]

connect direct wire between HT12E data out pin to HT12D data in pin and then check first

if you get input output same then there is no problem. if no then there may be many problems as suggested by GANEEV

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