Some people may have known already about the temperature sensor built into the ATMEGA8, 168, 328 series microcontrollers, but the most serious enthusiast would write off the 1°C resolution as just a coarse sensor of no practical use. I would have to say I was part of that group, until I compared the response between the two sensors.
The TI LM35DZ is a simple temperature sensor that has an accuracy of +/-0.5°C at 25°C and with 0.08°C of self heating, this should be sufficient to demonstrate the rough nature of the ATMEGA328′s internal temperature when compared to dedicated external sensor. The TO-92′s have the best Thermal Reponses on the datasheets and are the cheapest. Connection is straight-forward, +5VDC, Vout and Gnd with Vout to the ATMEGA328′s PC0 (Arduino pin A0).
For the ATMEGA328 internal sensor, adjustment of the voltage offset can be used to calibrate to another sensor.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — How Intel Makes a Chip
Wearables — Tape tactics
Electronics — Ground connections cooler via more vias
Biohacking — Itch Tracker for Apple Watch
No comments yet.
Sorry, the comment form is closed at this time.