Im fairly novice at arduino, but i want to create a body thermometer.
When a reading is taken place, i want it to servo meter to respond in the speed of spinning.
I also want the arduino to store the readings on a calender with in the software.
if anyone could advice it would be so appreciated.
Thanks
Please tell more as your project is not really clear.
Do you want to let the user touch a temp sensor?
wireless temp sensor? - not trivial as first project
must the temperature be from some inner body part (lets say ear channel?) - watertight DS18B20 ?
What is the accuracy and precision you want to achieve?
If it is a medical application you need to calibrate check and meet several standards (depending on country)
An Arduino has no calendar, so you should add a RTC like the DS1307 (there are many sketches on that)
Measurements can be stored on an SD card
How often are measurements made?
What you mean by speed of servo?,
most servos have a fixed speed, variable position?
So please tell the whole story
I wrote a sketch to takes a resistor-thermistor voltage divider and maps the temperature (A/D output) to an RGB LED...
The code is for a tiny85, but if you gut the low-power sleep and watch-dog stuff you should be able to run on an UNO. Just read the AD and map() to one LED (or output to a motor the PWM value via a proper driver.)
How to take the AD count and get temperature:
http://playground.arduino.cc/ComponentLib/Thermistor2#.UyZA4I7D9PE
Ray
/*
M. Ray Burnette 20140210 Open Source: for "Hot Yet?" publication
Coding Badly Tiny core: https://code.google.com/p/arduino-tiny/
Binary sketch size: 2,852 bytes (of a 8,192 byte maximum)
Arduino 1.0.5 No bootloader used. Upload via ISP.
Project 3.3V Attiny85 @8MHz internal, under 10mA idle at 68F
Schematic:
x-----------------/\/\/\/\/\/\/\/---------------x---/\/\/\/\/\/\/\----xGND
| NTC 10K Thermistor | 10K 1% Resistor
| |
| ATTINY85 / ARDUINO |
| +-\/-+ |
| Ain0 (D 5) PB5 1| |8 Vcc |
x--- Ain3 (D 3) PB3 2| |7 PB2 (D 2) Ain1 ---
(Blue)- Ain2 (D 4) PB4 3| |6 PB1 (D 1) pwm1 (Green) ----------|<---x
| GND 4| |5 PB0 (D 0) pwm0 (Red) ------------|<---x
| +----+ | 100 Ohm
x----------------------------------------------------------------|<---x---/\/\/\/\/---Vcc 3.3V
*/
#include <avr/sleep.h>
#include <avr/power.h>
#include <avr/wdt.h>
boolean flag_wdt = 1;
int pinT = PB3; // Thermistor source voltage
int pinR = PB0; // Digital pin #0 Red
int pinG = PB1; // Digital pin #1 Green
int pinB = PB4; // Digital pin #4 Blue
int r; int g; int b;
const int nToSleep = 50 ; // # of stable temp readings before sleep
const int Delay = 100; // main loop delay in mS
double ADCcount;
double ADCprevious;
int nCount;
int ThermistorPin = 1 ; // A1 is physical pin #7 (PB2)
void setup()
{
// WDTO_15MS, WDTO_30MS, WDTO_60MS, WDTO_120MS, WDTO_250MS, WDTO_500MS,
// WDTO_1S, WDTO_2S, WDTO_4S, WDTO_8S
setup_watchdog(WDTO_4S); // Periodic Heartbeat to awaken deep sleep()
sleep_disable();
pinMode(pinT, OUTPUT); digitalWrite(pinT, HIGH); // Thermistor Source
pinMode(pinR, OUTPUT);
pinMode(pinG, OUTPUT);
pinMode(pinB, OUTPUT);
}
void loop()
{
wdt_reset(); // pat K9
ADCcount = analogRead(ThermistorPin) ;
if (ADCcount == ADCprevious) ++nCount;
if ( nCount > nToSleep )
{ // prepare for low current power-down state
pinMode(pinR, INPUT); digitalWrite(pinR, HIGH); // pullup enabled
pinMode(pinG, INPUT); digitalWrite(pinG, HIGH);
pinMode(pinB, INPUT); digitalWrite(pinB, HIGH);
SleepLonger: // Come here to re-sleep
pinMode(pinT, INPUT); digitalWrite(pinT, HIGH);
system_sleep();
sleep_disable(); // deep sleep until WDT kicks
pinMode(pinT, OUTPUT); digitalWrite(pinT, HIGH);
delay(50);
// Yawn, exercise a few reads for stabilization
for (uint8_t z=0; z<5; z++) {
ADCcount = analogRead(ThermistorPin) ;
}
if (abs(ADCcount - ADCprevious) < 4) goto SleepLonger; // hysteresis
// restore LED output drivers ... temp has gone up
pinMode(pinR, OUTPUT); digitalWrite(pinR, HIGH);
pinMode(pinG, OUTPUT); digitalWrite(pinG, HIGH);
pinMode(pinB, OUTPUT); digitalWrite(pinB, HIGH);
nCount = 0;
} else {
// 261 = 32F, 447 = 64F, 537 = 75F, 575 = 82F
b = map(ADCcount, 261, 447, 100, 255 );
g = map(ADCcount, 435, 574, 250, 100); // overlap green & blue
r = map(ADCcount, 575, 1023, 250, 50);
if (ADCcount > 574) // HOT: ADCcount goes up with increase temperature
{
// Show only Red when Hot with Red intensity increasing with temperature
analogWrite(pinR, r);
analogWrite(pinG, 255); // 255 = 100% High == NO LED Current Common Anode --> Vcc
analogWrite(pinB, 255); // Blue Off
} else { // Cold to Cool transition with Blue fading into Green
analogWrite(pinR, 255); // Red Off
analogWrite(pinG, g);
analogWrite(pinB, b); // Brighter Blue with colder temp
}
}
ADCprevious = ADCcount;
delay(Delay);
}
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
// http://www.insidegadgets.com/wp-content/uploads/2011/02/ATtiny85_watchdog_example.zip
void system_sleep()
{
cbi(ADCSRA,ADEN); // switch Analog to Digitalconverter OFF
power_all_disable (); // power off ADC, Timer 0 and 1, serial interface
set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here
noInterrupts (); // timed sequence coming up
sleep_enable();
interrupts (); // interrupts are required now
sleep_mode(); // System sleeps here
sleep_disable(); // System continues execution here when watchdog timed out
power_all_enable (); // power everything back on
sbi(ADCSRA,ADEN); // switch Analog to Digitalconverter ON
}
// 0=16ms, 1=32ms, 2=64ms, 3=128ms, 4=250ms, 5=500ms, 6=1 sec,7=2 sec, 8=4 sec, 9= 8sec
void setup_watchdog(int ii)
{
byte bb;
int ww;
if (ii > 9 ) ii=9;
bb=ii & 7;
if (ii > 7) bb|= (1<<5);
bb|= (1<<WDCE);
ww=bb;
MCUSR &= ~(1<<WDRF);
// start timed sequence
WDTCR |= (1<<WDCE) | (1<<WDE);
// set new watchdog timeout value
WDTCR = bb;
WDTCR |= _BV(WDIE);
}
// Watchdog Interrupt Service / is executed when watchdog timed out
ISR(WDT_vect) {
// wdt_disable(); // disable watchdog
}
Hot Yet? Featured here: http://www.hackster.io/rayburne/
Do you want to let the user touch a temp sensor?
wireless temp sensor? - not trivial as first project
I want to create a thermometer that reads the temperature of your body, but i want the readings to be taken from the mouth.
must the temperature be from some inner body part (lets say ear channel?) - watertight DS18B20 ?
What is the accuracy and precision you want to achieve?
If it is a medical application you need to calibrate check and meet several standards (depending on country)
I want it to be fairly precise, as the readings will be between 35 and 38 but mainly 36-37.
An Arduino has no calendar, so you should add a RTC like the DS1307 (there are many sketches on that)
Measurements can be stored on an SD card
How often are measurements made?
Im going to program the arduino to let a alarm off, so a reading can be taken at the same time everyday.
What you mean by speed of servo?,
most servos have a fixed speed, variable position?
the higher the temperature between the fixed parameter, i will have a motor spinning and a flower will be fanned opened dependent on the speed. The speed of the motor will be varied on the reading taken.
Thank you for your reasponce.
Thank you Ray, i will do further research
So essentially you are looking towards a electronic thermometer to take the temp values(just like it is done in case of fever) and workout the actuator that is servo in your case to do interesting stuff?
Thank you Ray, i will do further research
@divyahirani
I also have 328 code (Uno/Nano) that is already in a function which may make the whole thing cut&paste:
http://forum.arduino.cc/index.php?topic=199216.msg1615491#msg1615491
Take what you need 
Many references and snippets were used.
Ray