Calibrating sensor input using Arduino




This example demonstrates one techinque for calibrating sensor input. The Arduino takes sensor readings for five seconds during the startup, and tracks the highest and lowest values it gets. These sensor readings during the first five seconds of the sketch execution define the minimum and maximum of expected values for the readings taken during the loop.

Circuit

Analog sensor (e.g. potentiometer, light sensor) on analog input 2. LED on digital pin 9.

Arduino Calibration




image developed using Fritzing. For more circuit examples, see the Fritzing project page

Connect an LED to digital pin 9 with a 220 ohm current limiting resistor. Connect a photocell to 5V and then to analog pin 0 with a 10K ohm resistor as a reference to ground.

Schematic

Arduino Calibration schematic

Code

Before the setup, you set initial values for the minimum and maximum like so:

int sensorMin = 1023;        // minimum sensor value
int sensorMax = 0;           // maximum sensor value

These may seem backwards. Initially, you set the minimum high and read for anything lower than that, saving it as the new minimum. Likewise, you set the maximum low and read for anything higher as the new maximum, like so:

Major Components in Project

Hardware Required

  • Arduino board
  • (1) LED
  • (1) analog sensor (a photocell will do)
  • (1) 10K ohm resistor
  • (1) 220 ohm resistor
  • breadboard
  • hook-up wire

For more detail: Calibrating sensor input using Arduino




This Post / Project can also be found using search terms:

  • BYLNY ETHERNET DİJİTAL SENSOR INPUT ARDUINO
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