RF Wireless LCD Temp Monitor Using TM4C123 & MSP432

[lalo630 8]

Hello,

 

I want to make a wireless thermometer using two microcontrollers.

 

How do I write the code in Energia to transmit and receive a variable using a 433 Mhz RF module? 

 

 

Transmitter Setup:

I have a TM4C123G connected to a RF transmitter using TX(3) pin 34 on the MCU.

The TM4C123G is also connected to a LM34DZ Temp sensor.

 

 

 I need help to modify this working code to send the temperature variable using tx(3) pin 34

/*TM4C123G*/

//initializes/defines the output pin of the LM34 temperature sensor
int outputpin= A11; // (pin # 2), use A11 analog input
 
//---------------------------------------------------------------------
 
//this sets the ground pin to LOW and the input voltage pin to high
void setup()
{
Serial.begin(9600);  
Serial3.begin(9600);
//----------------------------------------------------------------------
}
void loop()  {
int rawvoltage= analogRead(outputpin);
float millivolts= (rawvoltage/4095.0) * 3300;
float fahrenheit= millivolts/10;
 
Serial3.write(fahrenheit); //transmits temperature to receiver
Serial.println(fahrenheit);//displays temperatur on Serial monitor
delay(200); 
}

Receiver Setup:

 

I also have a MSP432 connected to a RF receiver using rx pin 3 on the MCU.

The MSP432 is connected to a 16x2 LCD.

 

 

 I need help to modify this working code to receive the temperature variable using rx pin 3 and display to the lcd.

/*Receiver MSP432*/
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#define rfReceivePin 3 //RF Receiver pin = pin 3
unsigned int data = 0; // variable used to store received data

byte address = 0x3F; // LCD I2C address
int columns = 16; // number of columns on LCD
int rows = 2; // number of rows on LCD
LiquidCrystal_I2C lcd(address, columns, rows);

//-----------------------------------------------------------------
void setup()
{
lcd.init(); // initialize the lcd 
lcd.backlight();

}
//-----------------------------------------------------------------
void loop()
{ 
lcd.clear();
lcd.setCursor(0,0);
data=analogRead(rfReceivePin); //listen for data on pin 3
lcd.print("Temperature");

lcd.setCursor(0,1);
lcd.print(data);
delay(500); 
}

[energia 485]

Maybe I am missing it but I don't see a question in here. What is working and what is not? Can you please provide details?

[lalo630 8]

How do I write the code to transmit and receive the temperature using a rf module?

 

I want to transmit the temperature wireless from the tm4c123g to the msp432. 

 

Working:

 

• The TM4C123G can display the temperature correctly on the Energia serial monitor. 
• The MSP432 is connected to an LCD and that is also working.
• The TM4C123G has the rf transmitter connected to tx(3) pin 34
• The MSP432 has the rf receiver connected to rx pin 3

 

Problem:

 

• I do not know how to program the RF module to work.

[energia 485]

Which RF module are you using?

[lalo630 8]

I am using a 433 MHz RF module I bought on ebay.

 

Here is the link:

http://www.ebay.com/itm/251893229455?_trksid=p2057872.m2749.l2649&var=550779246789&ssPageName=STRK%3AMEBIDX%3AIT 

[lalo630 8]

This is the Transmitter Setup:

 

 

 

 

 

 

 

This is the Reciever Setup:

 

[energia 485]

What you need is the VirtualWire library: https://www.pjrc.com/teensy/td_libs_VirtualWire.html. Unfortunately this library is arduino specific and you will need to modify it to run on TivaC and MSP432.

 

Robert