Task 54 - Datalogging to Serial Monitor: Fritzing, Serial Monitor, software

The Fritzing diagram is very simple, & similar to the photocell Task.


Note the comparatively even readings from the first set of 10.

In the second set (i just reset), the readings are higher - i held the thermistor between my fingers for a while before resetting - then i let it go, & as expected, the values sank slowly, but didn't reach the previous level after 10 samples.

/*
* Project: DataLogging_Thermistor_task_54
* Author: Jane-Maree Howard
* Date: Saturday 12/06/2010
* Platform: Arduino 18
* Purpose: To data-log 10 successive readings from a thermistor
at 1-second intervals & output results to the SM
* Operation: The average resistance of the thermistor is about 10kOhms,
so it & the 10k resistor form a voltage divider, whose
junction is inputted to Analog 0.
* Description:
* Connect one end of the thermistor to 5V, the other end to Analog 0.
Then connect one end of a 10K resistor from Analog 0 to ground
this is quite similar to the photocell Task, but the software is
a little different.
*/
int thermistorPin = 0; // the thermistor and 10K pulldown are connected to a0
int thermistorReading; // the analog reading from the sensor divider
byte readCount = 0; // this counts the readings to allow halting..

void setup(void)
{
// We'll send debugging information via the Serial monitor
Serial.begin(9600); // baud rate 9600 should be set on the SM
Serial.println(); // skip a line to start with
}//end setup()

void loop(void)
{
// test for 10 readings
if (readCount == 10)
{
return; // stop after the 10th reading
}//if()
// read value on thermistor pin i.e. analog 0
thermistorReading = analogRead(thermistorPin);
// print the analog reading to the SM
Serial.print("Analog reading = ");
Serial.println(thermistorReading);
// delay 1 second
delay(1000);
// increment counter
readCount++;
}//end loop()