Input Capture

Measure frequency and duty cycle of external input signal

• Library:

• Simulink Support Package for Arduino Hardware / Common

• 

Description

The Input Capture block measures the frequency and duty cycle of the external input signal on the digital pin of the Arduino^®hardware board. The block utilizes the timer counters available on the Arduinohardware board along with the interrupt service routines to compute the frequency and duty cycle of the external input signal.

For more information on the conflicting usage of digital pins for a Simulink^® model that uses one or more combination of PWM, Standard Servo Read, Standard Servo Write, Continuous Servo Write, and Input Capture blocks, see the Conflicting Pin Configurations on Arduino Timer section.

Note

The Input Capture block does not support the Arduino Nano 33 BLE Sense board currently.

Limitation

Arduino Board Architecture	Maximum Measurable Frequency	Measurable Duty Cycle Range
AVR	50KHz	20% to 80%
SAMD	400KHz
SAM	400KHz

Ports

Output

Frequency — Frequency of external input signal

scalar

The block outputs the frequency of the external input signal in Hertz.

Data Types: uint32

Duty Cycle — Duty cycle of external input signal

1 to 100

The block outputs the duty cycle of the external input signal as a percentage.

Data Types: uint8

Parameters

Input capture pin number — Pin to which external input signal is connected

48 (default) | scalar

Enter the Arduino hardware board pin number to which the external input signal is connected.

Note

Do not assign the same pin number to multiple blocks within a model.

To know more on how to assign pins or to view the fixed pins for the Input Capture block, see Pin Mapping for Arduino Timer Dependent Blocks.

Sample Time — Time interval at which external input signal is read

0.1 (default) | scalar

Enter the time interval in seconds at which the block reads the external input signal from the specified pin number.