1. Radio Frequency Transmitter and Receiver
Receiver XERE02A
Transmitter XETX02A
~$20 from

2. DISCLAIMER & USAGE
The content of this presentation is for informational purposes only and is intended for students attending Louisiana Tech University only.
The authors of this information do not make any claims as to the validity or accuracy of the information or methods presented.
Any procedures demonstrated here are potentially dangerous and could result in damage and injury.
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3. 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

4. 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

5. 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
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

6. Implementation
pushing transmitter buttons will send different tones to the piezospeaker

7. 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); } }

8. Transmitters and Receivers Must Be “Paired”
Pair is labeled as #7 - solder the middle row to the upper row to pull pin 7 high
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!

9. 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
pair 1
pair 9
pair 5
pair 13
pair 2
pair 10
pair 6
pair 14
pair 3
pair 11
pair 7
pair 15
pair 4
pair 12
pair 8
pair 16

10. 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.