# Speed of sensors and node-red platform

**URL:** https://discourse.nodered.org/t/speed-of-sensors-and-node-red-platform/18559
**Category:** General
**Created:** [28 November 2019 15:44 UTC](https://discourse.nodered.org/t/speed-of-sensors-and-node-red-platform/18559 "2019-11-28T15:44:37Z")
**Posts on this page:** 1
**Showing post:** 23

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### Author: ![dynamicdave](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dynamicdave/32/96_2.png) [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)
#### Post date: [12 December 2019 13:56 UTC](https://discourse.nodered.org/t/speed-of-sensors-and-node-red-platform/18559/23 "2019-12-12T13:56:10Z")

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You might find this tutorial (I wrote for my IoT students) helpful.

> [@Ultrasonic distance sensor + OLED panel](https://discourse.nodered.org/t/ultrasonic-distance-sensor-oled-panel/4177):
>
> [Ultrasonic\_distance\_sensor](http://resources-area.co.uk/node-red-flows/ultrasonic_distance_sensor.pdf)[Link to YouTube video about SRF05, etc...](https://www.youtube.com/watch?v=aLkkAsrSibo)[Organic Light Emitting Diode panel](http://resources-area.co.uk/node-red-flows/oled_panel_v5.pdf) I've just finished writing an instruction sheet for my IoT students on creating an ultrasonic distance sensor using the SRF05 device. Please note the SRF05 works off of +5v and ground, and needs a level shifter to convert WeMos signal levels to/from the device. DO NOT connect the 'Echo Output' signal directly to the WeMos - you must use a level shifter. Note: There are details about leve…

One thing to note is the HC-SR04 and -SR05 are powered from +5v.  
This means you will need a level shifter (details are in the tutorial) if you plan to use it with a RPi or ESP8266 - otherwise you will probably destroy the Pi or the microcontroller !!!!!!

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