External node needed:
node-red-contrib-fan
node-red-contrib-counter
It is handy to split flow into groups. Yes, I know the latest version allows that in the edit screen.
I'm not up to speed with it and so use the fan node.
This is being typed on the fly. I don't know how to structure it in an easy way.
You will see things in the flow which may make you ask: "Why?" Please read this all and I hope it will all make sense.
Scenario:
I am building (another) clock.
RasPi (headless) and s 20x4 LCD.
I know that is making my life difficult, but I seem to enjoy trying hard things.
And it isn't that I want to drag anyone else into this, but I'm stuck.
I haven't even got the buttons connected yet.
At the top I build the menu structure and save it to global.context.
Forget about the next bit about setting the global context (two inject nodes and a change node)
Down a bit further is an inject node: Menu
This calls up the menu on the display. Doesn't matter if you don't have one.
Going to the right you get to change node. (Start menu at line?) This is because I can only show 4 lines at a time.
If there is more than 4, the menu is grouped into blocks of 4.
That then goes into a function node that spits out 4 lines of text that are formatted with position data at the end. (@x,y)
That output is sent into the counter node that adds a msg.count to the messages. This is used to control the y position of the message. (See template node)
That then gets it's topic set and sent to the display.
Then, it loops back to the left to a switch node. When all 4 lines are shown, it goes to a trigger node. (Basically a delay, but indulge me doing it this way)
That then goes into another function node.
That prints > at a position.
Part of that is got from global.LINE. I'll get to that very shortly, as that is where the problems happen.
Just under this bit of code you will see two inject nodes. Up and Down.
The switch nodes check that the MENU is being displayed.
The next node is a change node. This sets msg.payload to global.LINE.
Next is a switch node checking if 0 or 4 have been exceeded. (Lines on the display.)
Pressing the Down 4 times the switch node sends the output to output #1.
That goes down to the +4 function node below.
That adjusts the global_index to it's value +4 and saves it.
Then the .... wires loop back to the left (and up) to re-do the menu.
It works to here.
And you can press the Down button to move to the other 4 items.
Yes, 3 of them are dummies.
So the problem?
(Yes, I also get that the up and down seem back to front, but down moves the cursor down the screen - up in menu items.)
So: Page 2, the cursor is blinking away happily on the top line. (0)
If you press the Up button, it goes back to the previous screen.
But.... The cursor needs to be at the bottom.
Now it all starts to fall apart!
Just a bit further down, you see an inject and function node. The inject node pulses every 0.5 seconds.
That shows me global.LINE.
On the first menu page, as you press the Down button, you will see this increment.
When it gets to the new page, it is back to 0. Fair enough.
So on page 2, top line: You press the Up button.
The display is wiped, the original 4 lines are printed and the cursor is supposed to be at 0,3.
This is done by function node called > you saw before when the display had been given 4 lines.
global.LINE is changed to 3 if you look in the -4 function node.
You probably won't see it as it is reset to 0 and I don't know why.
There are 4 nodes on the flow (and nowhere else on any other flow on the machine) that adjust the global.LINE value.
They are the -1, +1, +4 and -4.
Yes, there are the other two at the bottom.
One is simply showing you (node.status) on the function node connected to the repeating inject node, and the other one SET used to set global.LINE to 3 for testing.
How do I see this is actually happening?
Towards the top you will see a lovely inject node called: LOOK AT ME in the docs.
Just below it is a link - in node.
(If you want)
Press the Down and Up buttons and see what is happening and how the node at the bottom is showing you the LINE value.
Go to the second page and press the Up button..
Now: delete the link on that link - in node below the inject node.
Press the Down button 4 times.
Look that LINE is showing.
Then press the Up button.
You will see "Line value set to 3" clearly in the debug window.
(That is to set the cursor on line .... 3)
Then a "Starting 1" message. That is from the function node printing out the lines.
The you see..... "Y is set to 0"
And Y was just shown as set to 3.
How does it get wiped?
Go to the second page of the Menu and delete the afore mentioned link.
Press the Up button.
You can see LINE is still 3.
Now go to the inject node "LOOK AT ME in the docs" and press it.
LINE gets changed to 0, and I don't know why.
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I know. It is a mess. I am developing it. Arduino code is different to Node Red, and the logic is different as all parts of Node-Red are active at all times.
That is why I have global.SCREEN, LINE and menu_index.
Is what I wrote clear enough?
