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modnexaremote [2009/06/15 22:29] seststmodnexaremote [2018/11/03 02:59] (current) – external edit 127.0.0.1
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 +{{ :nexatotal.jpg |Nexa Receiver and Transmitter}}
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 ====== Generic 433 MHz transmitter ====== ====== Generic 433 MHz transmitter ======
 The [[audioprotocoltransmitter | AudioProtocolTransmitter]] module, can encode digital protocols as audio signals from the sound card/audio output from a PC. To be able to transmit the signals, some kind of hardware is needed. This is a description of how to build a generic RF-transmitter working on the 433MHz band. The [[audioprotocoltransmitter | AudioProtocolTransmitter]] module, can encode digital protocols as audio signals from the sound card/audio output from a PC. To be able to transmit the signals, some kind of hardware is needed. This is a description of how to build a generic RF-transmitter working on the 433MHz band.
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 Now any output from the sound card will be transmitted as a 433MHz signal, and we have a generic remote control transmitter! Now any output from the sound card will be transmitted as a 433MHz signal, and we have a generic remote control transmitter!
 +
 +===== Step 3, Package =====
  
 There are many ways to hook this up to the computer. I used a cheap USB-headset converter as sound card, put the OP-Amp-circuit on a Veroboard and powered it from the USB-cable and finally put the whole pile into the box of an old WLAN-HUB. It looks ugly inside, but once I close the box I have a nice looking USB-connected generic 433MHz transmitter :-). There are many ways to hook this up to the computer. I used a cheap USB-headset converter as sound card, put the OP-Amp-circuit on a Veroboard and powered it from the USB-cable and finally put the whole pile into the box of an old WLAN-HUB. It looks ugly inside, but once I close the box I have a nice looking USB-connected generic 433MHz transmitter :-).
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 {{ :nexaremote4.jpg | Ready transmitter}} {{ :nexaremote4.jpg | Ready transmitter}}
  
 +The circuit board to the right of the Veroboard is actually a receiver I tried to put in the same box. I had to give that up, since it is to sensitive to the electromagnetic noise from the USB. I had to use the [[modupm|UPM-recevier]] connected via a few meter cable to get away from the noise. 
modnexaremote.1245097740.txt.gz · Last modified: 2018/11/03 02:57 (external edit)