# Ultrasonic sensor object detection

**URL:** <https://discourse.nodered.org/t/ultrasonic-sensor-object-detection/24007>\
**Category:** General\
**Created:** [1 April 2020 06:08 UTC](https://discourse.nodered.org/t/ultrasonic-sensor-object-detection/24007 "2020-04-01T06:08:16Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![cymplecy](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/cymplecy/32/2773_2.png) [@cymplecy](https://discourse.nodered.org/u/cymplecy)\
**Post date:** [1 April 2020 10:58 UTC](https://discourse.nodered.org/t/ultrasonic-sensor-object-detection/24007/9 "2020-04-01T10:58:27Z")

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try the node-red-contrib-pisrf node

> [@HC-SR04 Ultrasonic Sensor - rpi-srf - status not available](https://discourse.nodered.org/t/hc-sr04-ultrasonic-sensor-rpi-srf-status-not-available/21955/6):
>
> The node works for me (trig connected to pin10 - echo to pin 8, gnd to pin6 , vcc to pin 1) There are a a few things to check Have you got a newer 3.3V compatible version? If using an old 5V version - you need to use some resistors to reduce the echo signal voltage

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