1- The pinout of I/O connector
2- Example of an input application
3- Example of an output application
OS: Jetpack 4.5(L4T-32.5)
This blog post is suitable for:
• NVIDIA Jetson Nano SOM with DSBOARD-NX2 Carrier Board
In this blog post, we will test the IIO(Industrial Input Output) interface of DSBOX-N2.
First, let's look over the IO connector. On the connector, there are 3 isolated outputs, 2 isolated inputs and 1 isolated ground. When using IIO, always double check which ground pin you are using. You must use isolated ground for IIO applications.
Digital IN0 Test
Digital input side accepts signals between 12-24V (rated for 2.25mA). In our application, we used Heschen M12 Inductive Proximity Sensor (PNP & Normally Open(NO)) with 24V voltage source.
Find sysfs equivalent of the connected input pin from the table. For this setup it is gpio-504. After proper hardware connection, we can continue on the software side.
Set gpio504 (DIGITAL_IN0) as input and read sensor value. To do this, you could use the commands below.
sudo sh -c "echo 504 > /sys/class/gpio/export"
sudo sh -c "echo in > /sys/class/gpio/gpio504/direction"
sudo sh -c "cat /sys/class/gpio/gpio504/value"
Digital OUT0 Test
Digital output side can drive loads up to 24V and has a current limit of 1A. They work as low side switches, open-close between them and GND_ISO. So, you should have a circuitry as in the schematic below. In our application, we used GASHER 24V Indicator Light with 24V voltage source.
Find sysfs equivalent of the connected output pin from the table below. For this setup it is gpio-508. After proper hardware connection with industrial LED, we can continue on the software side.
Then set gpio508 (DIGITAL_OUT0) as output and control light state. To do this, you could use the commands below.
sudo sh -c "echo 508 > /sys/class/gpio/export"
sudo sh -c "echo out > /sys/class/gpio/gpio508/direction"
To short Output:
sudo sh -c "echo 1 > /sys/class/gpio/gpio508/value"
To open Output:
sudo sh -c "echo 0 > /sys/class/gpio/gpio508/value"
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