Using Ultrasonic sensor with node-red
First you need to install node-red-node-pisrf
After you install node-pisrf already you will see rpi-srf in Raspberry Pi column. Then you just drag and drop as figure below:
Then you need to connect Ultrasonic sensor with Raspberry Pi. You can connect as pin below:
After connect Ultrasonic sensor with raspberry Pi already now back to the node-red and do as below:
Add debug and connect it as below:
Add dashboard
Double on gauge
Then it will bring you into this dashboard page.
Now back to node-red and click on gauge again and change Units and Range and Deploy it again.
Then back to Dashboard page you will see
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