Having issues with a 433 MHz transmitter receiver pair. I've tried both the virtual wire library (GitHub - gioblu/PJON_ASK: THIS CODEBASE IS OBSOLETE, use PJON instead! ASK/FSK multimaster radio communication protocol for Arduino and IOT) and this (433 MHz RF module with Arduino Tutorial 1).
With the virtual wire library it seems that the transmitter is working (LED is blinking) but the receiver is mum about it (nothing shows up on serial monitor except for "setup"). I've tried three different pairs of transmitter/receivers and four different UNOs as well as a Mega. I've tried different voltages (3.3v as well as 5v for receiver as well as for transmitter). I also tried it without and then with an extra soldered antenna on both the transmitter and receiver (17cm coiled antenna I made out of solid core). I've pretty much ruled out faulty hardware.
What else should I be looking at? Here's a pic of my current setup while trying the code below: Imgur: The magic of the Internet
Under the second set of codes (in second link above), this is the code for the transmitter:
/*
RF Blink - Transmit sketch
Written by ScottC 17 Jun 2014
Arduino IDE version 1.0.5
Website: http://arduinobasics.blogspot.com
Transmitter: FS1000A/XY-FST
Description: A simple sketch used to test RF transmission.
------------------------------------------------------------- */
#define rfTransmitPin 4 //RF Transmitter pin = digital pin 4
#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-(i/3)){
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
}
}
And this is the code for the receiver:
/*
RF Blink - Receiver sketch
Written by ScottC 17 Jun 2014
Arduino IDE version 1.0.5
Website: http://arduinobasics.blogspot.com
Receiver: XY-MK-5V
Description: A simple sketch used to test RF transmission/receiver.
------------------------------------------------------------- */
#define rfReceivePin A0 //RF Receiver pin = Analog pin 0
#define ledPin 13 //Onboard LED = digital pin 13
unsigned int data = 0; // variable used to store received data
const unsigned int upperThreshold = 70; //upper threshold value
const unsigned int lowerThreshold = 50; //lower threshold value
void setup(){
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop(){
data=analogRead(rfReceivePin); //listen for data on Analog pin 0
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);
}
}