Input to output with reed switch with johnny-five

Using Arduino Project Guidance
1

Hi guys, first of all sorry if I've choose the wrong category and use wrong terms, I'm very noob with eletronics (I'm just a web developer) and not a native english speaker.

I'm trying to create a chessboard with a matrix of 64 reed switchs, first I'm trying with only four. The problem that I'm facing is that when the reed is closed I receive 1 as value for my input, good, but when it is open I start to receive randons 0 or 1. I understood the concept that disconnect is not equal to 0 but how can I solve it? I dont use gnd and 5v from arduino just input and output. I read about pullup mode of pins but Johnny-five seens to not have it. someone can help me? Other question if I dont do nothing and try to solve it in code, like... "if it stays 1 for 500ms it is closed, if not it is opened, is that a problem for the circuit? I mean can something stop to work?
my code is that

const five = require('johnny-five')

const board = new five.Board({ timeout: 3600 })

board.on('ready', function () {
  const pin2 = new five.Pin({
    pin: 2,
    mode: 0,
  })
  const pin5 = new five.Pin({
    pin: 5,
    mode: 1,
  })
  pin2.high()

  pin5.read(function (error, value) {
    console.log(value)
  })
})
2

If your chess pieces have magnets in them, you did not tell us how the reed switches are controlled, then any movement of a chess piece will cause any switches in it's path to close and open.
Not much you can do about that.
Paul

3

I used diodes to prevent that problem. It should work like a keyboard, the problem is when without a piece there it shows random 1 or 0 insted of a 0, that is problem I'm trying to solve =/

thanks :slight_smile:

4

Well, if we could see your actual code we might decipher what it is that your are doing and why it is not working. :roll_eyes:

Additionally, a proper description of the whole assembly ± detailed photos.

5

Jonny five? Am I the only person who does not know what that strange expression means?

Your description screams 'no pull up resistors', but without more information it's impossible to say for sure.

6

It sure does, but I was getting to that obliquely. A proper description is a fundamental requirement. :face_with_raised_eyebrow:

1 Like
7

I'm so sorry for the bad way I tried to explain my problem :frowning:

The good news is that I solved it. The 'pull up resistors' was the key as @PerryBebbington said

"Johnny five" is a javascript library to comunnicate with arduino from nodeJs. I learned how to set up "INPUT_PULLUP" mode from it and leard how this works and every thing is fine now, thank for all the help and again, sorry for the way I tried to explain, it is a kind hard to do begin so noob at eletronics and bad english speaker

1 Like
8

I may not completely understand what you want here but
How to write Timers and Delays in Arduino
includes an example sketch for
Delay execution until condition has been true for X secs

9

630×630 89.1 KB

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10

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