Read logic level value of digital pin on controller
Read Logic Level Value from Digital Pin on NI USB-845x Controller
Connect to an NI USB-845x Interface Device and read the logic level values of its digital I/O pins.
Connect to the NI USB-845x using its serial number. In this example, the NI USB-845x controller board that is connected to the computer has the serial
controller = ni845x("01F26E0A");
View the available digital I/O (DIO) pins on the controller and their respective pin
modes by using the
ans = 8×2 table Pin Mode ______ _______ "P0.0" "input" "P0.1" "input" "P0.2" "input" "P0.3" "input" "P0.4" "input" "P0.5" "input" "P0.6" "input" "P0.7" "input"
Since these are input pins, you can read the logic level value of any of these. These pins are connected to pins on the I2C peripheral device. Read the logic level value of the DIO(0) pin, P0.0.
value = readDigitalPin(controller,"P0.0")
value = 0
You can also read the values of all the pins at once.
value = readDigitalPin(controller,controller.AvailableDigitalPins)
value = 0 1 1 0 0 1 1 0
The order of these values corresponds to the order of the pins returned by
controller.DigitalPinModes. For example, the value of
1, and so
controller — Controller connection
aardvark object |
Controller connection, specified as an
aardvark object or
readDigitalPin(controller,pin) reads the pin's logic
level value for the Aardvark or NI USB-845x controller
pin — Digital input pin number
character vector | string
Digital input pin number to read the logic level value of, specified as a character
vector or string. Possible values are the pin numbers returned as strings by
controller.AvailableDigitalPins. You can also read the values of
all the pins by specifying
pin as the string array returned by
If a digital pin is not already configured as an input pin, you can set it using the
readDigitalPin(controller,"Pin1") reads the logic level
of the pin
"Pin1" on the Aardvark controller.
readDigitalPin(controller,"P0.0") reads the logic level
of the pin
"P0.0" on the NI USB-845x controller.
Introduced in R2023a