Radio coding transmission circuit composed of MICRF102 and PT2262

The transmitting system is mainly composed of a key addressing circuit, a coding circuit and a radio transmitting circuit. The schematic diagram of the transmitting system module circuit is shown in Figure 5. The main function of the transmitting system is to first address the switch of the controlled circuit, then encode the addressing information to obtain a coded pulse signal, which then modulates the radio transmitting circuit and transmits it.

The key coding circuit uses a diode combination logic switch array to address the controlled circuit switch, and the instruction coding circuit uses the coding chip set PT2262. Port A of PT2262 is the address code setting port, and port D is the data code setting end, which are respectively connected to the logic output of the diode combination logic switch array. The data has 6 states from 000 to 101. The RF chip used in the transmitter module circuit is MICRF1020. When there is no signal output at the data output end of the encoding chip PT2262, MICRF102 does not work and the transmission current is zero. When the control end of PT2262 is valid, the output serial pulse signal modulates and transmits MICRF102. The transmission current can be adjusted by the modulation resistor R2, thereby adjusting the transmission distance. A smaller R2 value can increase the transmission distance, and adding a diode switch array can expand the system into a multi-channel remote control transmission module.