0

Hidden Response Accuracy in the ATmega328P

atmega-lm35

Hidden Response Accuracy in the ATmega328P

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.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 12,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython 2019!

Have an amazing project to share? The Electronics Show and Tell with Google Hangouts On-Air is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — SiFive is a startup to pay attention to. RISC-5 is here to stay.

Wearables — Swatch it up

Electronics — Code like everyone’s watching

Biohacking — Stroboscopic Visual Training

Python for Microcontrollers — CircuitPython takes flight! All aboard with datum, Bluefruit CPX, and more! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.