These Simple RF receivers are the easiest way possible to add wireless control, painlessly! There's no programming, configuring or addressing - simply power the receiver with 5 - 10VDC and press the buttons on a matching RF keyfob remote. When the A button is pressed, it activates the first pin, when the B button is pressed, it activates the second one, and so forth for all four buttons. There's no microcontroller required, its just a simple one-to-one link.
These modules make it easy to control your project once its in an enclosure or from across the room, but there are some things to watch out for. One is that they do not have 'addressing' - if you have multiple receivers in a room, they'll all work at the same time with a single remote. Another is that there's no error checking or bi-directional link - that means the remote doesn't know if the module received the message or not. Third, there are a few different types of receivers and each one looks identical but they are actually differently!
This product is the Momentary M4 type! It only includes the receiver module, you will also need to pick up a keyfob transmitter Each receiver also has a VT pin, which will go high if any of the pins are activated. You can sort of use it as an 'interrupt' indicator.
Check this video for a more visual description:
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