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RF Transmitter Receiver

jasonchong0

May 26, 2011
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May 26, 2011
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Hey all!
I have just constructed a RF circuit to try out. I made use of the T5-434-5V and the R5-434-5-128 transmitter and receiver pair and also the HT12E and HT12D as the encoder and decoder for the transmitter and receiver respectively.

The schemetic I used can be found on page 6 of this datasheet: http://www.spelektroniikka.fi/kuvat/T5R5-434-5V.pdf

After following exactly, the circuit does not work. I connected the DOUT of the encoder and the DIN of the decoder directly and it works, which brings me to suspect it's the RF pair that's not working.

HT12E oscillator resistance: 1M ohm
HT12D oscillator resistance: 51K ohm

If anyone has any idea as to why the transmitting and receiving isn't working, your comments would be greatly appreciated!
Thanks!
 

davenn

Moderator
Sep 5, 2009
14,254
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Sep 5, 2009
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14,254
could be anything, most likely a wiring error
the ccts in the datasheet look very straightforward

A note at the bottom of the osc freq chart for the decoder states
"The recommended oscillator frequency is fOSCD (decoder) ~/= 50 x fOSCE (HT12E encoder)"

with your 1M Ohm for the TX encoder that is is 3kHz for a 5V supply
your 51k Ohm choice seems correct for 150kHz at a 5V supply

so lets see a pic or 2 of your construction and see if there are any obvious wiring errors. resize pix to a max of 800x600 and make sure they are sharp and easy to see :)

Dave
 
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