#595 LM35 Temperature Sensor

Reading ambient temperature with the LM35 and an Arduino without output display on a Nokia 5110 LCD.

Notes

This circuit uses an LM35 Precision Centigrade Temperature Sensor to measure ambient temperature, and display the result on a Nokia 5110 compatible LCD.

The LM35 is part of a series of easy to use temperature sensors:

Specifications for the LM35:

• Directly calibrated in ̊Celsius (Centigrade)
• 0.5̊C accuracy
• Less than 60 μA current drain
• Low impedance output, 0.1 Ω for 1 mA load
• Rated for full −55̊ to +150 ̊C range

Construction

Code

See LM35.ino for the sketch.

Reading temperature is straight-forward:

• LM35 output voltage is read with analog input
• scaled to 10mV/ºC

Libraries used:

• u8glib library used for driving the LCD

Credits and References

• LM35 datasheet
• Introducing LM35, LM335 and LM34 Temperature Sensors