Today's quest I receive temperature values. 30 - 75 (example) I want to display that with a RGB LED. Say 30 - 36 --> blue. Green starts to creep in then. 36 - 40 --> Blue fades out and becomes green. Towards the 40, red starts to come in. 40 - 75 --> Green fades out and it becomes only red. …

Here is an adaption of that code. As you didnt specify how you want RGB to be represented, I just spit out a whole bunch of different values (r,g,b,val,hex) in the payload object. Ignore the pink image nodes at the bottom - they are to demonstrate it working. [Oyu8DFZp4Z] [{"id":"e17b05ed.383be…

Steve-Mcl 26 September 2020 08:05 6

Andrew, have a look at this post. In the colourise function is some code you can adapt to generate a heat colour.

Topic		Replies	Views
Conversion Temperature (Celsius) to RGB Value General	5	1220	3 November 2020
Convert int to hex color Dashboard	5	1244	26 October 2020
Changing Light RGB Color using a variable General	7	1630	20 December 2021
From the ARDUINO world, MAP( ) command General	19	1078	5 June 2020
Nice RGB LED sequences? General	13	591	18 March 2021

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

"Colour mapping" - help needed to create RGB value

Related topics