Alfredo Oliveira / Mbed 2 deprecated LM35WorkingCode

Using LM35 Temperature Sensor we display the Temperature on the LCD

Dependencies:   mbed TextLCD

After one week trying to read a temperature using stm32f103c8t6 and a LM35 I found that the only thing missed was a 10uF electrolitic capacitor between groung and signal pins of the sensor. Now it is working right.

main.cpp

Committer:
armo
Date:
2020-07-12
Revision:
1:9218b5180bd2
Parent:
0:aed747a24dcd

File content as of revision 1:9218b5180bd2:

/**********************************************************************************************************/
/* ATTENTION: You have to put a 10uF electrolict capacitor between the ground and signal terminals of LM35*/
/**********************************************************************************************************/
#include "mbed.h"
#include "TextLCD.h"

AnalogIn LM35(PA_6);
TextLCD lcd(PA_12,PA_11, PB_6, PB_5, PB_4, PB_3);
Serial pc(PA_9, PA_10);    //Create an object of Serial Class PA_9=RX, PA_10=TX no FTDI

/*TextLCD lcd(p21,p22,p23,p24,p25,p26);*/

int main()
{
 double tempC,tempF,avg;//,a[49];
 int i;
 unsigned short a[99];
 while(1)
 {
 
avg=0;
for(i=0;i<99 ;i++)
{
a[i]=LM35.read_u16();
wait(.02);
}
for(i=0;i<99;i++)
{
avg=avg+(a[i]/100);
}


tempC=(((avg*3.3)/65535)*100);//3.685503686


//tempF=(9.0*tempC)/5.0 + 32.0;

lcd.locate(0,0);
//lcd.printf("  Temperature   ");
lcd.locate(0,1);
lcd.printf("%.2f \n %.0f",tempC,avg);
pc.printf("%.2f \n\r",tempC);/*This line is to monitoring de temp values on a Terminal*/
wait(.5);      
    }
 }