Do you know how to use the Unique Identifier number on newer PIC® microcontrollers? Are you trying to calibrate the temperature indicator, voltage references, or Analog-to-Digital Converter (ADC) output values? Maybe you have an Internet of Things application where you need to know how to tell different devices apart. A sensor node is also a great application where calibrated values given by the chip will speed up testing time and increase the accuracy of your node. These can both be done with the Device Information Area (DIA) on PIC microcontrollers and the Signature Row on AVR® devices. The unique identifier and calibration values are factory tested and easily accessed on certain PIC16 and PIC18 parts. PIC MCUs with the DIA Include: PICF153, PIC16F191, PIC18FxxK42, PIC18FXXK83 If you are looking for tutorials on how to access the DIA on PIC16 and PIC18 architectures, they can be found here: PIC16 Tutorial: https://mchp.us/2Za3Oln PIC18 Tutorial: https://mchp.us/2WbhZEN If you are looking for resources on the AVR MCU Signature Row, here are a few resources to get you started: Run-time calibration of the internal RC oscillator: http://ww1.microchip.com/downloads/en/appnotes/doc2563.pdf Voltage Reference Calibration and Voltage ADC Usage: http://ww1.microchip.com/downloads/en/appnotes/doc8060.pdf Internal RC Oscillator Calibration for tinyAVR and megaAVR Devices: http://ww1.microchip.com/downloads/en/appnotes/atmel-2555-internal-rc-oscillator-calibration-for-tinyavr-and-megaavr-devices_applicationnote_avr053.pdf