315Mhz RF Link Kits -With Encoder and Decoder
1、Transmitter module :
Special Parameter :
Frequency : 315Mhz
Modulation : ASK
Working Voltage : 4～9V DC
Frequency difference：min±75KHz max±150KHz
Launching power: 50mW (9V)
Working current：＜10mA (9V)
Frequency stability : 0.037ppm/℃
Transmission rate : ≤10Kbps
Encoder : PT2262 or Compatible Chip
Receiver Sensibility: -105dbm
Emission Distance: 500m in open ground
Size : 37 x 23 x 8mm
This module have been pinout All data interface, convenient for useage, and only when more than one data bits among 10 ~ 13 four data bits are high electricity level, the module will transmit the high frequency signal .
2、Receiver module :
This is superregeneration Decoder Receiver
Decoder : PT2272
Size: 36x17x8 mm
It can be compatible with transmitter with 2262 chip ，315MHZ ，and 1.5M Timing resistor
Specialized superheterodyne receiving module has an inherent disadvantages :
when remote control signal is too strong and the module oscillation signal will be blocked, and unable to properly receive signal.
So at this time, you should be away for some distance (such as 10 meters) and then it can work normally.
In order to test whether the receiving modules work normally, give a 5 v dc voltag between the VCC and GND interface of receiving module, and connect light emitting diode with pin 10, 11, 12, 13, 17 interface respectively
When we press A button of trasmitter module, its corresponding pin 11 road LED will be light, until press the other button such as B key, pin 11 extinguish and pin 12 will be light.
Pin 17 interface is the effective decoding output port, no matter which button of the transmitter we push, it will become high level as long as decoding successfully, the transmitter stop transmitting immediately and it will extinguish
Warning: this kit is not suitable for data transfer but remote control. Safe for 2 commands/second
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.
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