433Mhz Receiver about arduinoweatheros HOT 2 OPEN

Hi Alfredo, I am very pleased you like the project. I put a lot of work into the documentation to "proof" it and try to discover and correct any errors by doing so. Plus a lot of other publications about Manchester encoding and decoding were of very little help to my way of thinking. You will find nearly any of those 433MHz Rx/Tx combinations will be ok (as in your link). Where the more expensive versions are better includes- they have a stronger rejection of noise (ie better filtered out input), more stability, and also quicker Automatic Gain Control, which stabilizes them onto the incoming digital modulation quicker. Have a look at this one http://www.ebay.com.au/itm/433Mhz-Superheterodyne-3400-RF-Transmitter-Receiver-kit-for-Arduino-ARM-MCU-/381196613735?hash=item58c116b867:g:T6oAAOSw4shX4Kbb You will note that it does not have any coils or trimmer capacitors to be seen which means the whole stability is in the chips on the board. This is another brand, that is also a quality brand, Dorji, https://wiltronics.com.au/product/7612/dorji-433mhz-107dbm-ask-receiver-dip-package/ If you are after a quality module then these Dorji receivers are excellent if you want a better stability and more sensitive response. The boards come in all shapes and sizes and are all pretty good, though as I have outlined above, some are better than others. If you intend to use the system in a demanding environment eg noisy, long distance and/or high temperature range (eg outside) then get a more expensive version. My receiver is indoors and the transmitters are within 10m of the transmitter, so the simpler cheap Rx works ok for me. I made the board up about 7 years ago before the better Rx's became more common. I would choose a better Rx now if I needed to rebuild it. I hope that helps, Good luck and Cheers, Rob