A transmitter and receiver used in remote control projects
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Static receiver module operating current of 4mA, the receiver module factory output noise output, if there are special requirements can be changed to the noise-free output, but will reduce receiver sensitivity.
This is a widely use module in many different application, the cost is very low and easy to use. You have to use the MCU to simulate decode and encode process as the IC PT 2262 and PT2272. The popular link is like this: MCU -> Encoder -> Transmitter —— Receiver -> Decoder -> MCU, PT2262(Encoder) and PT2272(Decoder) are optional, their existence is to 1)avoid confusing when multiple RF links in range 2) isolate disturbance. You can integrate the encoding and decoding work to the MCUs on both side. Whenever there is no 315Mhz devices around, you may use it as direct cable connection. Excuse for the documentation, we will work on them.
We tried them using the guide from Sparkfun, it’s compatible. The only difference is in package, of some excess GND pins. More over, we will make more RF modules ourselves with different frequency and capacity.
Note about distance:
If the distance required for far, can be connected to the 1/4 wavelength of the antenna, generally use 50 ohm single conductor, the length of the antenna 315M of about 23cm, 433M of about 17cm;
The position of the antenna has also affected the reception of the module, install the antenna as straight as possible away from the shield, high pressure, and interference sources;