modnexaremote
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modnexaremote [2009/06/15 22:09] – created sestst | modnexaremote [2018/11/03 02:59] (current) – external edit 127.0.0.1 | ||
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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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==== Locate the data output ==== | ==== Locate the data output ==== | ||
Locate the signal output pin from the chip. This is where the digital protocol is sent to the RF-transmitter stage. | Locate the signal output pin from the chip. This is where the digital protocol is sent to the RF-transmitter stage. | ||
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==== Disconnect the output pin ==== | ==== Disconnect the output pin ==== | ||
Cut the track on the board from the output pin and the pin next to it, remove the surface mounted capacitor. This is a bit tricky, because the tracks are small... | Cut the track on the board from the output pin and the pin next to it, remove the surface mounted capacitor. This is a bit tricky, because the tracks are small... | ||
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+ | ==== Connect our signal ==== | ||
+ | The final step is to connect our digital output signal (from the OP-Amp) to the RF-transmitter. I used the hole in the PCB as guide and soldered it to the connecting pad of capacitor I removed: | ||
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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! | ||
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+ | ===== 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 :-). | ||
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+ | 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.1245096568.txt.gz · Last modified: 2018/11/03 02:57 (external edit)