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Item: 175601821828

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Qty: 1 PCS receiver module and 1 pcs transmitter module . Item Description ： Technical Data : Receiver Module No. : BX-RM06 -433 (match with our BX-TM01 -433 or BX-TM05 -433 module) Receiver Sensitivity (dBm):-112 ; Operating frequency (MHz): 433.92MHz ; Operating Voltage (V): DC 3-5.5V Low power consumption : 3.3V @ 433.92MHz, 6.0mA / 3.3V @315MHz，4.8mA； Operating temperature: -40 ℃ ~ +85 ℃ Power enable mode when the power consumption can be done a minimum 50nA; Level output of the RSSI signal strength simulation; Good local oscillator radiation suppression, receiver module to work with (ie, single income) and will not interfere with each other, with the use does not affect the receiver distance Transmitter module : Item Description ： Technical Data : Transmitter module No.: BX-TM01 -433 Operating frequency (MHz): 433.92MHz ( 315MHZ is available if required , other frequency can be custom made if order 100 pcs ); Transmit power: more than 10mW; Operating Voltage (V): DC 3-12V low transmit of the static power consumption is current consumption : 10 mA ( No transmit No current consumption); SAW Frequency stability :±75KHZ Data transfer rate : 3 kb/s Operating temperature: -20 ℃ ~ +60 ℃ Size : 11x16x5.5MM Type of Output: TTL Running TX433 and RX433 RF modules with AVR microcontrollers Sometimes in embedded design you may want to go wireless. Might be you will want to log various readings of remotely placed sensors, or simply build a remote control for robot or car alarm system. Transmitter and receiver modules are tuned to work correctly at 433.92MHz. Transmitter can be powered from 3 to 12V power supply while receiver accepts 5V. 5V is common for AVR microcontrollers so no problems with interfacing. Modules dont require addition components – just apply power and connect single data line to send information to/from and thats it. For better distances apply 30 – 35cm antennas. Modules use Amplitude-Shift Keying(ASK) modulation method and uses 1MHz bandwidth. I have constructed two separate circuits for testing on Atmega8 microcontrollers. Transmitter Receiver For testing I have used a prototyping board and breadboard. As you can see I have used one LED for indicating RF activity. Ok enough about hardware part – actually there is nothing more to say – circuits are simple. Lets move on to software part. Radio transmission is a bit more complicated than wired communications because you never know what radio signals are present on air. So all matters how transmitted signal is encoded. And this is a part where you have many choices: use hardware encoding like USART or write your own based on one of many ending methods like NRZ, Manchester etc. In my example I have used AVR USART module to form data packs. Using hardware encoders solves many problems like synchronization, start and stop, various signal checks. But as long as I was practising you cannot rely on plain USART signal. Here you can actually improvize by adding various checks and so on. I decided to form 4 byte data packages in order to send one byte information. These include: one dummy synchronization byte (10101010); one address byte – in case there are more receivers(or transmitters); one data byte; and checksum which is actually a sum of address and data(address+data). Why did I use a dummy byte at the beginning of package. Simply I noticed, that when transmitter doesnt transmit any data – receiver catches various noises that come from power supply or other sources because receiver likes adjust its input gain depending on input signal level. First byte tunes receiver to accept normal signal after then address byte, data and checksum can be read more reliably. Probably with different transmission modules you may exclude this dummy byte. Ttransmitter program for AVR Atmega8: #include #include #ifndef F_CPU //define cpu clock speed if not defined #define F_CPU 8000000 #endif //set desired baud rate #define BAUDRATE 1200 //calculate UBRR value #define UBRRVAL ((F_CPU/(BAUDRATE*16UL))-1) //define receive parameters #define SYNC 0XAA// synchro signal #define RADDR 0x44 #define LEDON 0x11//switch led on command #define LEDOFF 0x22//switch led off command void USART_Init(void) { //Set baud rate UBRRL=(uint8_t)UBRRVAL; //low byte UBRRH=(UBRRVAL>>8);//high byte //Set data frame format: asynchronous mode,no parity, 1 stop bit, 8 bit size UCSRC=(1< (0< //Enable Transmitter and Receiver and Interrupt on receive complete UCSRB=(1< } void USART_vSendByte(uint8_t u8Data) { // Wait if a byte is being transmitted while((UCSRA&(1< // Transmit data UDR = u8Data; } void Send_Packet(uint8_t addr, uint8_t cmd) { USART_vSendByte(SYNC);//send synchro byte USART_vSendByte(addr);//send receiver address USART_vSendByte(cmd);//send increment command USART_vSendByte((addr+cmd));//send checksum } void delayms(uint8_t t)//delay in ms { uint8_t i; for(i=0;i _delay_ms(1); } int main(void) { USART_Init(); while(1) {//endless transmission //send command to switch led ON Send_Packet(RADDR, LEDON); delayms(100); //send command to switch led ON Send_Packet(RADDR, LEDOFF); delayms(100); } return 0; } In my case I used UART 1200 baud rate. It may be increased or decreased depending on distance and environment. For longer distances lower baud rates works better as there is bigger probability for transmission errors. Maximum bit rate of transmitter is 8kbits/s what is about 2400 baud. But what works in theory usually do not work in practice. So 1200 baud is maximum what I could get working correctly. <

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