I did one project in the past with node red and that worked after struggling a lot. Now im doing a new one but i've lost the minimal knowledge i learned in the first project. Here is my project. I have 5 buttons. 1 4xrelay board. 1 pi zero w ive installed the pi and installed node red succesful…

[image] dynamicdave: You might find this useful as a reference. Here's a link to a worksheet I created for my IoT students. It shows how to create various types of buttons. Having fun with buttons Okey, after the correction I am now happy to say that button 3,4 and 5 are working as intende…

[image] jbudd: the value at a GPIO pin may well change randomly but how do I prevent it from doing this? should I just use a different pin, this one has RxD behind it, maybe thats the reason?

Firstly, you have not got the debug node connected directly to the gpio node. If it still does it, then if you have not connected a signal to it, it does not know whether it should be high or low. I am not at my pc, but I think that you can tell the pi to apply an internal pull up to the pin, so do…

If you read to the end of the Tutorial there is a link to the Node-RED flow (json file) which would have saved you typing in all the code. I need to make this link easier to find for people (but not my students). For future reference, here's a direct link to the flow. http://resources-area.co.uk/n…

[image] spawnreaper: [image] jbudd: the value at a GPIO pin may well change randomly but how do I prevent it from doing this? should I just use a different pin, this one has RxD behind it, maybe thats the reason? I'll restate what I said yesterday but with some gaps and emphasis in the…

[image] jbudd: Basically you need to tell the Pi whether the pin should normally be high or low. It does that by applying an internal resistor. Ill try and find a resistor and make a small board so I can route my wires though them.

There seems to be some language difficulty between us. I can't help you any further, sorry.

As @jbudd and myself said, there is no need for resistors until you want to connect to a physical button. You just need to tell the node what you want it to do. [image] Note the instruction to tell it to use an (internal) pullup.

[image] spawnreaper: should I just use a different pin, this one has RxD behind it, maybe thats the reason? That sounds like you are using the TTL Receive pin, probably not the best choice. Try and stick to using the pins with a green dot in this table jbudd linked https://pinout.xyz/ Confi…

Okey, it seems that my button one is stable now. and button 3,4 and 5 are also stable. Last challenge left is button 2. What I need it to check is if any relay 2,3 or 4 is on, if any is on then turn all of them off. If all are off, then turn all on. Only I dont know how to make the relay state …

First time using buttons

General

spawnreaper 15 June 2023 21:02 28

I can give it 3 outputs no problem, but Im still stuck on the function node that needs to check the status, let alone send different commands to different outputs.
I am asking anyone in my network, but havent found anyone that can help me with the code.
Its the last button I need to get working, the rest work.

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First time using buttons

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