# Using Ultrasonic sensor with node-red

* First you need to install node-red-node-pisrf

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU02AO0DzWrtaiR0o5%2F-MDU1F7EuS2j2viw3dTs%2Fimage.png?alt=media\&token=10d7b4b8-0976-4a2f-8d62-ed9b26ba88ca)

* After you install node-pisrf already you will see rpi-srf in Raspberry Pi column. Then you just drag and drop as figure below:

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU02AO0DzWrtaiR0o5%2F-MDU1fraXhO5J6FjmGBd%2Fimage.png?alt=media\&token=e8a91a92-4e4f-404c-86c4-7b5fcd98ecd7)

* Then you need to connect Ultrasonic sensor with Raspberry Pi. You can connect as pin below:

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU02AO0DzWrtaiR0o5%2F-MDU3QkpBQdbpMQ3uKnj%2Fimage.png?alt=media\&token=8518a818-1e7b-44c4-ad74-7a599f3fc2e9)

* After connect Ultrasonic sensor with raspberry Pi already now back to the node-red and do as below:

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU02AO0DzWrtaiR0o5%2F-MDU4Db1xj7E1xXht4fD%2Fimage.png?alt=media\&token=b8db60c9-643e-4760-b2ba-49c0ce7a2ef3)

Add debug and connect it as below:

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU02AO0DzWrtaiR0o5%2F-MDU4xkIzN6Uuy8NdcVl%2Fimage.png?alt=media\&token=ebc87496-5efb-4cef-bc3b-218de1b9d914)

* Add dashboard

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU02AO0DzWrtaiR0o5%2F-MDU5Gv5NgvR3DFZDTml%2Fimage.png?alt=media\&token=4250f76f-80bf-421a-aeae-30f841cc36d1)

* Double on gauge

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU5LkAFQVkBm-SK7iV%2F-MDU6fXjzXUXvs3E53RX%2Fimage.png?alt=media\&token=509c3bba-dbd9-46c9-af07-a50ef181e308)

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU5LkAFQVkBm-SK7iV%2F-MDU6Fmx_OF-7d7lmWbD%2Fimage.png?alt=media\&token=f5d53433-1620-4b1d-92e5-2468732b0d4b)

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU7CCooDqSjSa2N33h%2F-MDU7ot_-wJc2Xb5Uj5w%2Fimage.png?alt=media\&token=7cb48429-0a18-4def-84c0-10cdaca9bf6a)

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU7CCooDqSjSa2N33h%2F-MDU83txYfEXHp2t3RAJ%2Fimage.png?alt=media\&token=cc12125e-dece-49e7-b928-e6e0d3859c77)

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU7CCooDqSjSa2N33h%2F-MDU8G6ki9-IgXt1-8fW%2Fimage.png?alt=media\&token=efa077fe-c51d-44d7-add9-cfdce0d67f0a)

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU7CCooDqSjSa2N33h%2F-MDU9iFqZJDYRrWy-LNn%2Fimage.png?alt=media\&token=b7a29262-e5a3-4f0d-be6c-f48b0d3a9607)

* Then it will bring you into this dashboard page.

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU7CCooDqSjSa2N33h%2F-MDU8wkTQwrxeEkigvbj%2Fimage.png?alt=media\&token=516b3312-ff66-48ff-a99a-d612b6a7cc8d)

Now back to node-red and click on gauge again and change Units and Range and Deploy it again.

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU7CCooDqSjSa2N33h%2F-MDUA0X0kCFXXdgvTU5E%2Fimage.png?alt=media\&token=a8277969-4488-482a-bdd1-29ff2d619e5b)

Then back to Dashboard page you will see

![](https://1856353139-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MClo3nC-1US0rbK8Qau%2F-MDU7CCooDqSjSa2N33h%2F-MDUAEuqi5XU_1tAVp81%2Fimage.png?alt=media\&token=73d58975-d082-40af-8093-c128c40457c8)