Radio Frequency Transmitter and Receiver Receiver XERE02A Transmitter XETX02A ~$20 from http://xenon-tech.com

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Transmitter Sends Signal to the Receiver B D C A four pins on the receiver are tied to four buttons on the transmitter a pin goes high when a button is pressed

Data Sheet for Transmitter: XETX02A economical short range RF transmission (< 45 meters) designed for automotive applications low power consumption (typically: 10nA when not transmitting) powered by a small 12V battery transmission power of 10mW available in frequencies of 315MHz and 435MHz available

Data Sheet for Receiver: XERE02A 2 – data valid 3 – GND 4 – output B 5 – output D 6 – output C 7 – output A 8 – antenna (18cm of wire for 433MHz) 8 1 2 3 4 5 6 7 economical short range RF transmission miniature size of 47 x 20 x 8 mm low power consumption (typically: 4mA) operating temperature range of -10°C to +70°C target operating voltage: 5V (should be between 4V and 6V) available in frequencies of 315MHz and 435MHz

Implementation pushing transmitter buttons will send different tones to the piezospeaker

Implementation void setup(){Serial.begin(9600); } void loop() { int A=digitalRead(2); int B=digitalRead(5); int C=digitalRead(3); int D=digitalRead(4); Serial.print(A); Serial.print(B); Serial.print(C); Serial.println(D); if (A==1) {tone(12,1000);} else if (B==1) {tone(12,1500);} else if (C==1) {tone(12,2000);} else if (D==1) {tone(12,2500);} else {noTone(12); } }

Transmitters and Receivers Must Be “Paired” Pair is labeled as #7 - solder the middle row to the upper row to pull pin 7 high 8 7 6 5 4 3 2 1 pull high pull low NOTE: For RF transmitter and receiver pairs rented though LWTL, this has already been done . . . no need for you to solder!

Transmitter Receiver Pairs The configurations below show how the eight pins can be pulled high or low through soldering to create 16 unique transmitter / receiver pairings There are 28 = 256 possible pairings If all 256 are desired, it would be nice to treat the pins as digits of a binary number . . . the soldering scheme here is just for convenience 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 pair 1 pair 9 pair 5 pair 13 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 pair 2 pair 10 pair 6 pair 14 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 pair 3 pair 11 pair 7 pair 15 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 pair 4 pair 12 pair 8 pair 16

Transmitting Signal to the Receiver transmitter 7 receiver 7 transmitter not paired with receiver 7 Transmitter 7 controls receiver 7. Using another transmitter at the same time jams communications between transmitter 7 and receiver 7.