AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Wireless outlet switch with remote1/24/2024 ![]() I can easily insert it to the sound card at the back of my desktop PC. This way, the whole circuit sits on a breadboard without any external power adapter. I used my handy AASaver to provide the +5V needed by the RF receiver. The picture on the left is my implementation of the circuit. One important thing is that you should plug the audio cable to the Line-In jack on your sound card, not the Mic jack. Scroll down and you will see the schematic to make the sniffing circuit. ![]() 48,000 Hz), and it can record a signal over a long time, so it is more convenient than using an oscilloscope. The sound card can digitally sample the signal at high speed (e.g. To record the signal, a simple way is to use your sound card and an audio recording software. Ok, here is the fun part: how can we sniff the signals sent by the remote control to the sockets? It turns out that most of these remote controls work in the 434 MHz band (note: some work in 315 MHz), so we can use a cheap 434 MHz RF receiver to intercept the signal. With only a toggle button, if there is a power reset or if the previous command was not successfully received, you will mess up the control and end up with completely flipped on/off status. So if you want to make sure the socket is on, just repeatedly send the on signal. The reason I picked this model is because it has separate On and Off buttons for each socket, instead of just a Toggle button. This is different from the model I had before, and it’s not based on the PT2262 encoder, so I cannot predict the RF signal by just looking at the circuit board connections. To get started, I picked a set of indoor wireless power sockets from Amazon. ![]() Also, support for remote power sockets have been added to OpenSprinkler firmware 2.1.1. Update: check out the RFToy - an easy-to-use standalone gadget to control remote power sockets.
0 Comments
Read More
Leave a Reply. |