Analog Input

R2026b

Read ADC register value after ADC conversion at analog pin of Arduino AVR core

Since R2024a

• 

Analog Input Advanced AVR block

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Libraries:
Simulink Support Package for Arduino Hardware / Advanced / AVR

Description

Add-On Required: This feature requires the Simulink Support Package for Arduino Hardware add-on.

Use the Analog Input block to read the value from an ADC register after analog to digital conversion on the Arduino^® AVR analog pin. You can use the block to read up to three analog voltage outputs simultaneously.

Note

The Analog Input block supports C/C++ code generation. This feature allows you to generate C and C++ code using Embedded Coder^®.

Ports

Output

ADC_Ch1(A0) — ADC output data

scalar

The block outputs the digitally converted voltage data received by the analog input pin of the Arduino board. The number of output ports depends on the number of analog input pins you specify in the Number of analog input pins parameter. For example, if you set the Number of analog input pins parameter to 3, the block enables three output ports with port names ADC_Ch1(A0), ADC_Ch2(A1), and ADC_Ch3(A2).

Data Types: double

Parameters

Number of analog input pins — Select number of analog inputs

1 (default) | 2 | 3

Select the number of inputs for analog to digital conversion.

Pin number 1 — Arduino pin number

0 (default) | Arduino board pin number

Enter the Arduino board analog input pin number. To open the Arduino pin mapping table, click View pin map. For more information on how to assign pins for the Analog Input block, see Pin Mapping for Arduino Timer-Independent Blocks.

The number of Pin Number parameters depends on the number of analog input pins you specify in the Number of analog input pins parameter. For example, if you set the Number of analog input pins parameter to 3, the block enables the Pin number 2 and Pin number 3 parameters. You can enter the analog pin numbers for the Arduino board accordingly.

ADC trigger — Select a trigger to start ADC conversion

Free running mode (default) | Timer/Counter 0 Compare Match A | Timer/Counter 0 Overflow | Timer/Counter 1 Compare Match B | Timer/Counter 1 Overflow | Timer/Counter 4 Overflow | Timer/Counter 4 Compare Match A | Timer/Counter 4 Compare Match B | Timer/Counter 4 Compare Match D

Select a timer/counter trigger to start the ADC conversion on the positive edge of the trigger. Connect the Arduino hardware board pin to the PWM input signal using the PWM block to enable the timer/counter.

• Free running mode — Operates independently of the clock and triggers an ADC conversion by the end of the previous conversion.

• Timer/Counter 0 Compare Match A — Trigger an ADC conversion once the value of the Timer/Counter 0 matches the value stored in the output compare register (OCR) A.

• Timer/Counter 0 Overflow — Triggers an ADC conversion when the value set in the Timer/Counter 0 register reaches its maximum value.

• Timer/Counter 1 Compare Match B — Trigger an ADC conversion once the value of the Timer/Counter 0 matches the value stored in OCR B.

• Timer/Counter 1 Overflow — Triggers an ADC conversion when the value set in the Timer/Counter 1 register reaches its maximum value.

• Timer/Counter 4 Overflow — Triggers an ADC conversion when the value set in the Timer/Counter 4 register reaches its maximum value.

• Timer/Counter 4 Compare Match A — Trigger an ADC conversion once the value of the Timer/Counter 4 matches the value stored in OCR A.

• Timer/Counter 4 Compare Match B — Trigger an ADC conversion once the value of the Timer/Counter 4 matches the value stored in OCR B.

• Timer/Counter 4 Compare Match D — Trigger an ADC conversion once the value of the Timer/Counter 4 matches the value stored in OCR D.

For more information about supported ADC trigger sources and board-specific constraints, see Supported ADC Trigger Sources for Arduino AVR Boards.

Enable ADC conversion complete interrupt — Enable interrupt after ADC conversion is complete

on (default) | off

Select this option to generate an interrupt after the analog voltage at the pin of the Arduino hardware is converted to its equivalent digital voltage.

Note

Once you enable this parameter, make sure to select the appropriate Interrupt group and Interrupt name parameters in the Hardware Interrupt for AVR block.

More About

Supported ADC Trigger Sources for Arduino AVR Boards

The availability of ADC trigger sources depends on the AVR microcontroller used on the selected board. This table lists the supported ADC trigger sources across the supported Arduino AVR boards.

ADC Trigger Source	ATMega2560 (Arduino Mega 2560 / Mega ADK)	ATMega328P (Arduino Uno / Nano)	ATMega32u4 (Arduino Leonardo / Micro / Robot Motor / Robot Control)
Free running mode	✔	✔	✔
Timer/Counter 0 Compare Match A	✔	✔	✔
Timer/Counter 0 Overflow	✔	✔	✔
Timer/Counter 1 Compare Match B	✔	✔	✔
Timer/Counter 1 Overflow	✔	✔	✔
Timer/Counter 4 Overflow	❌	❌	✔
Timer/Counter 4 Compare Match A	❌	❌	✔
Timer/Counter 4 Compare Match B	❌	❌	✔
Timer/Counter 4 Compare Match D	❌	❌	✔

Version History

Introduced in R2024a