# Learn Embedded Programming [Step by Step]

## Bluetooth Based Temperature Meter Project using Microcontroller and MikroC USART Terminal

In this project , we will measure surroundings temperature and it will be shown at MikroC USART Terminal . First of all we need to set up LM35  sensor with pic microcontroller and an ADC register will take data from the temperature sensor . After calculating the temperature in centigrade  it will be sent to  our computer's MikroC USART terminal through Bluetooth[HC-06] . That is the basic concepts of this project.

 Bluetooth Based Temperature Meter Project using Microcontroller

We will need an ADC Converter so that microcontroller can read the temperature .

## ADC [Analog to Digital Converter]:

Basically ADC is like as voltage divider . According to voltage It produce output .
bit 5 : VCFG0: Voltage Reference Configuration bit (VREF- source)
1 = VREF- (AN2)
0 = VSS or 0 volt

bit 4 :VCFG0: Voltage Reference Configuration bit (VREF+ source)
1 = VREF+ (AN3)
0 = VDD or 5volt

We will set  VCFG0[bit 5]=0and VCFG0[bit4]=0 . So we will get highest value 5volt[1023] and lowest value 0volt[0].The ADCON1 is a 10 bit register that means  (2 to the power 10) is it's highest counting capacity and the result is 1024 . So this register can count from 0 to 1023 . When 0 volt , we get reading at RA0 pin  0 .When 5 volt , we get reading at RA0 pin 1023. It means 5volt equivalent to 1023 .
If  1023 reading value    equal   to 5 volt.
So 1      reading value    equal   to  5/1023 volt
As we know LM35 reading can be changed  with  0.01 v per degree centigrade change , the temperature calculation should be like that :
0.01 volt   for     1      degree centigrade Temperature
so  1     ,,       ,,  (1/0.01)   ,,         ,,              ,,

### Mikro C Library Funtions :

UARTx_Init:  This function will initialize USART option of  Microcontroller with Baud rate . We will use baud rate 38400 . The code will be look like this :
UART1_Init(38400);

UARTx_Data_Ready: This will check if it is available to read or transmit data .
UART1_Read_Text(  txt,  ")" , 13); }
This is checking if data is available to read . ")" means , txt car array variable will be being stored until the ")" will found . 13 means to try for 13 times . So , i think our text should not be longer than 11 character .
UARTx_Write_Text: This will send text data . Look at the example :

if (UART1_Tx_Idle() == 1) {// this will check , if the last data transmission is completed

UART1_Write_Text("button2");
}

## Circuit :

 Bluetooth Based Temperature Meter Project using Microcontroller and MikroC USART Terminal

## Source Code :

``````
char txt[8];
double chk;
int i=0,ckop=0;
void main() {
ADCON1=0x0E;         // Configure RE1 pin as input
CMCON=7;
for(i=0;i<16;i++){txt[i]=' ';}
TRISA.F3=1;
UART1_Init(38400);
delay_ms(200);            // Initialize LCD
while(1){
chk=(chk*5)/1023;
chk=chk/0.01;  //10mV == 1 degree
inttostr(chk,txt);
UART1_Write_Text(" Temperature:");
UART1_Write_Text(txt);
UART1_Write_Text(" \n");
delay_ms(6000);
}
}

``````

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## Course by The University of Texas at Austin

(FREE Edx Course) Embedded Systems - Shape The World: Microcontroller Input/Output. Offered by The University of Texas

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