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high power rf relays
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high power rf relays
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I am a young electrical engineer and have been in the sport for a few years and need some help. I have made single tone RF transmitter and recievers before and want to do more then 1 decoding. For example a transmitter with buttons that I can run LEDs on another circuit board. I can acomplish this with the HT12D and the HT12E but am having trouble understanding the pins and how to wire them. I understand how to set my freqquency and everything but What are the "adress pins" and What are the "data pins" At first I though that when you set frequencies on both transmitter and receiver I had reason to thing connecting address 0 to ground would cause an output on address 0 on the other chip. But in circuits I have found there were switches on all of the address pins on both chips. PLEASE HELP I am so confused, if you know you can help go ahead and email me.
And got the following answer:
The two links below show the encoder and decoder. It will help to use an oscilloscope for testing. Obviously you expect serial data to appear on pin 17 of the encoder and this is received at pin 14 of the decoder. Connect these 2 data pins and the ground pins directly without the radio, until you verify that the configuration is ok.. When pin 14 of the encoder chip is low, the 12 bit data is sent. The 12 bit data has 4 bits of binary encoding for 4 switches (buttons) to operate up to 4 relays in combination (this could be further decoded into 16 separate relays at the receiver but then only one can be operated at a time). The other 8 bits is the address, which is so that there are 256 different "keys" that can be used. This address is so you can set your device to a code that is different to anyone else around you, and also makes it less likely to trigger falsely from receiver noise. Obviously the encoder and decoder adresses must be the same, so they may have switches so you can set the addresses to match. In the example diagrams below, they are all set to high (floating). You will have to decide what turns the transmitter and encoder on, and how to enables the data at the encoder. It shouldn't just be repeating continuously on the transmitter, as the regulations for these radios doi not allow that. There may need to be pullup resistors on the transmitter or receiver data lines. The data could be inverted perhaps by the transmitter or receiver. The oscillator frequency for the serial data rate must be the same exactly on each device, and low enough in frequency that it fits in the transmitter/receiver bandwidth. The transmitter may need to be on for a guard period before the code is sent, and of course stay on long enough for the code to be completed.An oscilloscope will help verify the operation, but it is not essential if you think it out. The data sheets have more examples on how to trigger the !TE line etc.. Make sure you read the information for your device, as they refer to several devices. Use a regulated power supply (maybe 5V), and check it is working properly.
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