I am trying to use the AD 8302 phase detector chip to obtain phase angle between antenna's receiving a RF signal due to the vertical separation of the antennas. I want to use the phase angle to calculate the distance from the transmitter to the receiving antennas that are placed on an upright wooden platform. These antennas have a vertical separation of 5 ft from each other.
The transmitter operates on 433 MHz and its the generic transmitter/ receiver pair. The phase detector gives me phase output in terms of Volts that has a range of 30mV to 1.8 V. In the data sheet this range represents 180 degrees to 0 degrees. The outputs from the phase detector chip go into the arduino and that is how I make the calculations for the distance as well as the angle.
I have calculated antenna lengths (reception antenna's) for Quarter Wavelength.
These are the relevant links:
Chip:
http://www.analog.com/media/en/technical-documentation/data-sheets/AD8302.pdf
Transmitter/Receiver:
https://www.amazon.com/UCEC-XY-MK-5V-Transmitter-Receiver-Raspberry/dp/B017AYH5G0/ref=pd_lpo_vtph_147_bs_t_1?_encoding=UTF8&psc=1&refRID=CTNNV120F5GWXTBJ6K2G
This is to calculate antenna length using a piece of wire:
I am not able to obtain the correct phase angle needed to calculate the distance from the transmitter to the antennas.
PIC_1 is the structure and PIC_2 is the transmitter.
This is the code for the transmitter:
#define rfTransmitPin 12 //RF Transmitter pin = digital pin 12
#define ledPin 13 //Onboard LED = digital pin 13
void setup(){
pinMode(rfTransmitPin, OUTPUT);
pinMode(ledPin, OUTPUT);
}
void loop(){
//for(int i=4000; i>5; i=i/800){
digitalWrite(rfTransmitPin, HIGH); //Transmit a HIGH signal
digitalWrite(ledPin, HIGH); //Turn the LED on
//delay(2000); //Wait for 1 second
// digitalWrite(rfTransmitPin,LOW); //Transmit a LOW signal
// digitalWrite(ledPin, LOW); //Turn the LED off
// delay(i); //Variable delay
// }
}
This is the code for the Receiver:
//#define rfReceivePin 8 //RF Receiver pin = Analog pin 0
#define vmag A1
#define vphs A0
#define ledPin 13 //Onboard LED = digital pin 13
//int vphs = 0;
//int vmag = 1;
unsigned int data = 0; // variable used to store received data
unsigned int DATA = 0;
unsigned int data1 = 0;
unsigned int DATA1 = 0;
const unsigned int upperThreshold = 70; //upper threshold value
const unsigned int lowerThreshold = 50; //lower threshold value
String angle="Angle:";
String mag="Vmag:";
String dis="Distance";
void setup(){
pinMode(ledPin, OUTPUT);
pinMode(vmag,INPUT);
pinMode(vphs,INPUT);
analogReference(DEFAULT);
Serial.begin(9600);
}
void loop(){
data = analogRead(vphs); //listen for data on Analog pin 0
data1 = analogRead(vmag);
//data=analogRead(rfReceivePin)
/*Serial.println(((data)/10)*2);*/
/*DATA=*/
Serial.print(angle);
Serial.println((((data)/10)*2)-40);
Serial.print(dis);
Serial.println((5/tan(data)));
delay(500);
/*DATA1*/
Serial.print(mag);
Serial.println(((data1)/30)*2);
delay(500);
//Serial.println(6/tan(DATA*(180/3.14)));
/* if(data>upperThreshold){
digitalWrite(ledPin, LOW); //If a LOW signal is received, turn LED OFF
Serial.println(data);
}
if(data<lowerThreshold){
digitalWrite(ledPin, HIGH); //If a HIGH signal is received, turn LED ON
Serial.println(data);
}*/
}
EDITED
