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Lab 23. Detect GPIO changes

Lab 23. Detect GPIO changes

Enable the D0 GPIO notification

This step enables the GPIO input pin. It is a required step for reading its value or activating notifications.

The D0 GPIO corresponds to the DP2 pin on the DC9003 SmartMesh Eval/Dev Mote.

  • create a flow which issues:

    • an HTTP PUT request

    • to URL http://127.0.0.1:8080/api/v1/oap/{{mote}}/digital_in/D0

    • with payload

      { sampleCount: 1, rate: 10000, enable: 1, dataFormat: 1 } 

  • Open the SmartMesh IP Tools Guide (https://www.analog.com/media/en/technical-documentation/user-guides/smartmesh_ip_tools_guide.pdf), look for section "/digital_in". What does dataFormat 1 mean? 

Answer 1:

Trigger D0 GPIO notifications

  • Make sure you have a Node-RED flow enabled that listens to /oap notifications (see Lab 15. receive temperature )

  • Connect a jumper between the DP2 and VSUPPLY pins. Make sure you receive a notification.

  • Move the jumper to connect the DP2 and GND pins. Make sure you receive a notification.

  • You can transition the jumper between the two positions above to generate further notifications.

NEVER CONNECT VSUPPLY and GND TOGETHER!!