Our project consists of an MQ3 Gas sensor with 2 UNOs for transmitting data wirelessly with RF Modules.
For some odd reason, the boards seem to be unable to communicate with each other. Are we doing something wrong?
Sensor: MQ-3 Gas sensor
Board(s): Arduino UNO
RF Modules: FS1000A Transmitter and Receiver, 315 - 433 MHz
Also Included: Piezoelectric Buzzer, 1602A 16x2 LCD and 10K Ohm Potentiometer
(See codes below)
For transmitter:
#include <RH_ASK.h> // Include RadioHead Amplitude Shift Keying Library
#include <SPI.h> // Include dependant SPI Library
#include <MQUnifiedsensor.h>
#include <LiquidCrystal.h>
#define analog_pin A0
#define notDrunk 10 // Define max value that we consider not Drunk
#define Drunk 44 // Define min value that we consider drunk
// const int buzzer = 9; // buzzer to arduino pin 9
// const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
// LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
// const int ledPin = 9;
char *data;
char dataStr[10];
//properties
uint8_t x = 0; //v ariable to be transmitted to slave board <== sensor_value
float sensor_value; // variable to store sensor value
// Create Amplitude Shift Keying Object
RH_ASK rf_driver;
void setup() {
// Initialize ASK Object
rf_driver.init();
// Setup Serial Monitor
Serial.begin(115200);
}
void loop() {
float sensor_value = analogRead(analog_pin);
if (sensor_value > 254) { sensor_value = 255; };
sensor_value = (sensor_value / Drunk) * 100;
x = sensor_value;
char *msg = "Hello World";
if (x < 22.07) {
*msg = "Sober";
} else if (x < 100) {
*msg = "Legal";
} else {
*msg = "Drunk";
};
rf_driver.send((uint8_t *)msg, strlen(msg));
rf_driver.waitPacketSent();
{
// Message Transmitted
Serial.println("Message Transmitted: ");
delay(1000);
}
}
For Receiver:
#include <RH_ASK.h> // Include RadioHead Amplitude Shift Keying Library
#include <SPI.h> // Include dependant SPI Library
#include <LiquidCrystal.h>
const int buzzer = 9; //buzzer to arduino pin 9
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
// Create Amplitude Shift Keying Object
RH_ASK rf_driver;
void setup() {
pinMode(buzzer, OUTPUT); // Set buzzer - pin 9 as an output
// pinMode(ledPin, OUTPUT)
Serial.begin(115200); //Init serial port
Serial.println("MQ3 warming up!");
lcd.begin(16, 2);
// ;
lcd.println("MQ3 warming up!");
delay(500);
lcd.clear();
lcd.print("Waiting for Transmitter");
delay(500);
// Initialize ASK Object
rf_driver.init();
// Setup Serial Monitor
Serial.begin(115200);
// Serial.clear();
Serial.print("Waiting for Transmitter");
}
void loop() {
// Set buffer to size of expected message
uint8_t buf[10];
uint8_t buflen = sizeof(buf);
// Check if received packet is correct size
if (rf_driver.recv(buf, &buflen)){
lcd.clear();
// Message received with valid che-cksum
Serial.print("Message Received: ");
Serial.println((char*)buf);
lcd.println((char*)buf);
}
}
No, you need to solder about 17 cm (433 MHz) or 23 cm (315 MHz) of straight wire to the ANT terminal, on both the transmitter and receiver. Don't expect the setup to work without those.
Please post a clear, focused picture of your setup.
I was unable to get a picture, as I am not the one holding the physical components
But I have a proteus schematic that shows the wirings MQ3 Wireless with Display.PDF (33.8 KB)
I also changed up the wirings and updated the code
I then tested the new code and wirings on the simulator
But it fails to transmit the data between the boards on the simulation
This time it seems like the code does have issues
I am testing the code with the Proteus simulation software to simulate data reading with a sensor
I don't expect accurate results, but it doesn't seem to work
In the code, it will return a fail message if the data fails to send between the two boards
But i don't think i made any mistakes in the wiring.
Board Type: Arduino UNO R3
Sensor: MQ-3 Gas Sensor
Also Includes: RF modules and Display with POT. MQ3 Wireless with Display.PDF (33.8 KB)
How can a simulation determine whether an RF signal is sent or received?
In the real world, set up a pair of Arduinos with radio modules, and test it using the simple examples that come with the RadioHead library. When that is working to your satisfaction, add your sensor code.
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