simple 433Mhz Tx and Rx examples

hoogscherm · Joined: 17 Jul 2008 Posts: 6

I found these cheap FS1000A (or FS100A) 433MhzRF transmitter/Receiver modules.
The pgm uses manchester-code to transmit/receive
The range depends on the antenna you use and the TX-power supply.
A short wire of about 17cm and a simple 5V power gave me stable data at a range of over 40 meter.
Hope these light examples can be used as starting project for other users.
It took me a few days before I had a good working project

Construction is simple. Rx and Tx modules only have 3 wires. (+5, Data, Gnd)
You can use any pin to connect with the Transmitter, any pin (except Hardware uart pins) to connect the receiver.
maybe, a clever guy can explain me why I needed to use the INVERTED option in the receiver-module to read the data from the receiver Confused

(Open "comc.0:600,8,n,1,INVERTED" For Input As #2 )
My example transferts 6 bytes each 5 seconds+Checksum, easy to send more (or less) bytes.

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

thank you for sharing your project. yes these are nice and cheap transmitters/receivers. Very Happy

I see you use manchester encoding/decoding which makes sense.
There are built in functions since version 2082:

W = Manchesterenc(j) ' encode into manchester code whith results into a WORD
B = Manchesterdec(w) ' decode it back

the transmitter/receiver you use have no uart, they just send/receive a signal. and it happen to be inverted. that is why you need the inverted option.