Guys, I have a value being sent across by MQTT (actually a string but then i convert it to an Int) - the number is a binary representation of the state of pins on a Arduino - each of the pins represents a state for a device to be in - such as 208 is Boiler on, circulating pump on, solar off, Valve …

It seems you would have to reverse the logic that creates the number. Which begs the question how do you create the number you send representing all the GPIO pins?

If, in a function node you do msg.payload = msg.payload..toString(2); return msg; That will convert your number back into a string, but in binary, so the value 208 will be converted to "11010000" Now you can reference the individual states using msg.payload[0], [1] etc. There is the complication…

[image] Colin: perhaps someone else will suggest the best way (possibly padStart() Hi Colin, This code should do the job. The second parameters is the total size of the binary string to be generated. function padStart(dec,len){ let binary = dec.toString(2); let padding = "0".repeat(len-bin…

errr - isn't padStart built in these days ? [image] String.prototype.padStart() The padStart() method pads the current string with another string (multiple times, if needed) until the resulting string reaches the given length. [{"id":"d8f5efb7.a44cb","type":"i…

[image] dceejay: errr - isn't padStart built in these days ? Only since Node 7.0... so there are versions of Node we support with 0.19 that doesn't have it.

I am transitioning from an old Picaxe based system (writen in Basic) that is more than 10 years old. There is a function in picaxe basic to essentially read all the pins in one go and report it back as a binary representation. The issue is that this system was developed as a collabaritive effort wit…

Oh wow - that is pretty cool and looks like ti might help - will start playing around with it. Looked at using switch nodes last night - but there will be way too many of them to manage - might incorporate this Binary idea and look at a function with switch statements (does anyone know if i can nes…

[image] craigcurtin: does anyone know if i can nest switch statements ? Hi Craig, The short answer is yes, you can nest switch statements in JavaScript. However, depending on the complexity of your use case the code can become ugly and hard to maintain and troubleshoot. Perhaps you can tell …

Can you show binary output message?

Hey Andrei, Thanks for taking the time to follow this one up. Here is an example - the value 240 (Decimal representation of binary pins) represents - Circulating pump on, boiler on. So when my system is running in the middle of the night i will get an MQTT stream in of 240 every minute. When the …

Node-RED

Node-RED Forum

Advice please on best way to attack this

General

Colin 1 September 2018 09:43 14

Can you give an example of a problematic case?

Function Buffer to Outputs

Topic		Replies	Views
[newbie] how to program this more elegantly General	11	582	30 August 2020
MQTT Toggle, to change ZWAVE Bulb state General	17	1962	5 March 2020
Change the Output between 0 and 1 on each message that I receive in the input General	18	4035	22 July 2021
Nicedevil's Starting Questions General	95	2964	27 September 2019
Convert switch state to binary and add seperate array General	3	287	24 February 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.

Advice please on best way to attack this

Related topics