microchip-pic-avr-examples / atmega4809-adc-basics-mplab

An introduction to adc's on megaavr 0 series

ATmega4809 Xplained Pro ADC Basics

MegaAVR® 0-series devices feature a 10-bit Successive Approximation register (SAR) Analog-to-Digital Converter (ADC) capable of conversion rates up to 115 ksps. It features a flexible multiplexer, which allows the ADC to measure the voltage at multiple single-ended input pins.

There are four modes we will explore in this example:

• ADC Free-Running mode
• ADC Single Conversion mode
• ADC Window Comparator mode
• ADC Sample Accumulator mode

This is an example of how to get started with the ADC on the ATmega4809. This is based on the application note AN2573.

Related Documentation

• AN2573 - ADC Basics with tinyAVR 0- and 1-series, and megaAVR 0-series
• ATmega4809 Device Page

Software Used

• MPLAB® X IDE v6.15 or later
• MPLAB® Data Visualizer
• Studio Data Visualizer
• XC8 (v2.45) alternatively AVR/GNU C Compiler 5.4.0 can be used
• ATmega_DFP 3.0.158 or later

Hardware Used

• ATmega4809 Xplained Pro

Setup

• Port PD6 is the ADC channel input, connect a cable here to interract with the ADC

Operation

1. Download the zip file or clone the example to get the source code.
2. Open atmega4809-adc-basics-mplab.X in MPLAB.
3. Connect the ATmega4809 Xplained Pro to the computer with a micro USB cable.
4. Make sure the kit is selected as the tool to be programmed under project settings.
5. Press the make and program button to program the device.
6. Open the desired terminal application or Data visualizer and open the serial port associated with the Xplained Pro.

As mentioned in the appnote AN2573 you can change the voltage level of the adc input port and the approximated value will be shown over UART through data visualizer.

Conclusion

We have here shown how to setup and get started with the ADC basics project. For more details about this example and how the ADC works please see the AN2573 Application Note.