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Return to BlogLCD Thermometer Based on Arduino
Posted Jan 25, 2012 at 11:17 am
Figure 1
A simple Min/Max thermometer has been implemented in this project using an Arduino to interface with a 2-line LCD and LM35DZ temperature sensor.
The design includes the Arduino being plugged into a breadboard and the Arduino’s analog input is connected straight to the output. The 3 pins that comprise the LM35DZ temperature sensor include the +5V, ground, and a variable voltage output to indicate the temperature which will be shown in a HD44780 LCD controller compatible device Displaytech 162B. For the output to run when selected, the serial monitor of the Arduino IDE should be used. For testing, the sensor can be read by running a program wherein the conversion is done to degrees celcius and then output it to the serial port, without the LCD.
Eigth data lines can be used to drive the Displaytech 162B LCD module by using most of the digital I/O pins on the Arduino in 4-bit mode, since it is easy to interface them with Arduino. The contrast control is provided by the other two pins of the potentiometer which are connected to +5V and GND. Since the backlight LED gets warm, a resistor has been added.
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