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  • Author Author: easyejl
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What's in the box! Don't look in the box!

easyejl

Probably that will get tiresome after a while, but dang that was a good movie.

 

image

And whoo boy after starting looking, I think I might know more about what to do with a severed head than this image

 

Mostly it seems that the MKR Zero uses different libraries and definitions than the nano/e3 so some of the sample code I had been looking at for the VL53L0X won't work without major rewrite. But there's always other sample code.

 

The box's contents

 

1 - Arduino MKR Zero (in the end 2 image )

1 - MULTICOMP PRO Portable USB High Capacity Power Bank

a whole bunch of WAGO Pluggable Terminal Block

1 - MICROCHIP MCP604-I/P Operational Amplifier

1 - VISHAY Phototransistor

1 - MIDAS OLED Graphic Display

1 - MICROCHIP Temperature Sensor IC

2 - ST Range/Gesture Sensor 53L0-SATEL-I1

 

 

I'm not very good at electronics. It's funny, I was going through the early teens at just the wrong time, turned 13 in 1980 image I pretty well skipped straight from simple electrical experimentation to computers. Luckily nowadays you can buy component blocks that have the details of "what ohms resistor do I use" or "how many microfarads of a capacitor do I need" already worked out. But I'm pretty rocking at software development, been writing code for 41 years I guess now. Dang I feel old.

 

 

The Arduino MKR Zero

It's pretty interesting how many different options there are in Arduinos (as well as the other SBCs/microprocessor boards). The MKR Zero is one of the smallest form factors, energy efficient and has a built in SD card slot. It also has a few neat features not in most other arduino boards.

* There's a connector that meant for connecting a LIPO battery which is handy.

* This board runs on 3.3v instead of 5.

* There's another connector for a second hardware I2C channel. Useful as there are a limited number of pins so in a larger project this really could make a huge difference.

 

Beyond that, what's supposed to be it's big feature is I2S (Inter-IC Sound). That's an electrical serial bus interface standard for connecting digital audio devices. This allows for the MKR Zero to directly play and analyze music files but that would specifically be .wav files.

 

Pretty nice overall, handy for portable projects. I killed my first one's USB port by shorting out the USB power pins due to attaching power with it not on a breadboard. There was a pair of pliers on the desk and the pins ended up brushing on it. No problems with the 2nd one outside of what others have noticed - the USB isn't exactly stable on a windows machine. I frequently had to put it into bootloader mode to get it to connect.

 

Also something new I learned is that you can't have Cura running with the Arduino IDE, even if its set to use Octoprint. Cura appears to scan USB ports and frequently locked the Arduino.

 

MULTICOMP PRO Portable USB High Capacity Power Bank

A pretty nice power blank. no complexities here. I had considered opening it up to see what it's battery native voltage was (to use plugged directly into the MKR Zero), but it felt unnecessary. Worked nice overall.

 

WAGO Pluggable Terminal Blocks

I had never looked at these before, but they are pretty cool. they come in various configurations of how many wires connect together, and then each module can click into a variety of holders they have. For this project they'll get used for the AC power coming into the box.

 

MICROCHIP MCP604-I/P Operational Amplifier

Given my lack of great electronics knowledge, i wasn't totally sure on what to use this for. I understand the general use, but the devil is in the details. Plan for it is to use it with the phototransistor to help buffer it to giving a true on/off signal.

 

VISHAY Phototransistor

This I went back and forth with, partially due to my difficulty with getting a straightforward open/closed signal from it. For this project, plan was to have it be a safety interlock, shutting off the circuit if the box is opened.

 

MIDAS OLED Graphic Display

I was surprised at how small this was. Still quite a nice display, and Adafruit has some simple libraries that work really well.

 

MICROCHIP Temperature Sensor IC

Nice, small, easy to work with. It's downside is that its not a fast temperature sensor. It takes a second or two for it to update. Also, it appears to have a really fine measurement capability, but at the same time it appears to vary a bit (within 0.1 degrees though).

 

And the fun part, that really drove the thought process for me

 

ST Range/Gesture Sensor 53L0-SATEL-I1

These are pretty neat. Basically a LIDAR unit. These are configured to be used with ST's Nucleo development board, and their documentation is a little spotty if you're planning on using it as the whole satellite board without the Nucleo. They are breakoff boards, so you can bust it down to just the VL53L0X piece but then you need some other components. Also, part of the challenge with this was that the ST libraries didn't cooperate with the MKR Zero, as its a SAM-D board. There's some differences in the dependent libraries like Wire which added to the challenge. ST has an example with gesture recognition that I was never able to get working. In the end it was ok, it was still easy to get the distance measurements from the chips which was all I really needed.

 

My Project

I started off with a variety of ideas, but ended up with something my wife came up with. She showed me a video of someone using Alexa to control a sewing machine's speed and that started it off.

 

The core concept is helping someone who has difficulty with using a foot/knee pedal consistently to use hand gestures instead. The gesture sensors will catch the gesture, the temperature sensor would be attached to the sewing machine motor, and both the power level and temperature would be displayed on the OLED. The phototransistor would as mentioned above act as a safety interlock, shutting everything down if the box is opened as it will have live 110 AC. The power bank would power the arduino so there's no need to use a wall wart or other transformer with it.

 

Other parts

I started with trying to wire up a triac myself, but realized I didn't have an appropriate transformer so wasn't going to be able to do a decent zero detect. So I ended up ordering a dimmer board meant to use with an Arduino. I also got an I2C multiplexer to make interfacing the gesture sensors a little easier.

 

Progress

It didn't reach completion in time, but I will still finish it. I ran into a variety of issues over the project. Shorting out the first MKR was one. Another issue was the number of components. I got to running out of pins on the Arduino. Related to that, although some pins are programmable, some are not. So trying to get it all working together took a bit of shuffling around. In the end I couldn't manage to get the zero detect and interrupts with the dimmer working along with everything else. Their library I couldn't get to work at all, but found some more direct code that worked when the only thing connected to the arduino was the dimmer. with everything connected it never worked out. That also could be from the code however as using the PWM based on zero cross is pretty timing specific. It happens every 166 milliseconds, so any delays would throw it off.

 

 

But here's a video with most of the rest of it working!

 

The rest of the journey is documented below. It was fun getting here, and painting the sewing machine was a lot of fun too.

Parents

  • So after some struggle, i've worked out the pinout on the breakoff portion of the TOF boards. It appears ST "intends" for them to be used with their nucleo eval board setup which with header sockets soldered on it would directly plug into. the VL53L1X portion of the boards has direct contacts that are marked, but the other side doesn't.

     

    More entertainingly, my wife has conned me into a specific project for her using the box.... She lately has been into restoring old sewing machines. She has a variety ranging into the 1950s, and some of them have some really interesting mechanics primarily related around pop in cam systems to do designs and patterns. But she also has 2 100+ year old singers with motors, a whopping 1/20hp. One was overall in fairly decent shape and she already has that one restored to usable and maybe just needs a little cosmetic help but isn't bad overall.

     



    The other one is kind of a mess all around, seized up, etc. She's already managed to sneakily talk me into (as if it was my own idea) to use some of my chromaflair pigment to paint it after she's taken it apart and stripped the paint off it. image

     

    So that's got nothing to do with the box right?  Well after conning me into using the chromaflair for the other one, she then shows me a video from one of the sewing groups she's in of a woman controlling the speed of a sewing machine using Alexa. Then tells me that the woman said she can't take it over 75% because at that point the sewing machine is too loud for alexa to hear her image . She lets me talk about how impractical the idea is, because I know how to use a sewing machine and the combination of normal alexa lag time plus the way you'd really want to use it wouldn't work well. Then she sets the hook "it's useful for people who have difficulty keeping consistent pressure on a foot or knee pedal"....

     

    And so talked me into a gesture controlled sewing machine from the box. It works out almost perfectly, the phototransistor can determine the light in the room and automatically turn on the sewing machine light if its dark, the temperature sensor to monitor the motor temp, the oled to display the temp and the motor speed and the TOFs for the gesture. She's going to end up with a pretty wacky space age 110 year old sewing machine once we're done.

     

    So I need to get triac and a couple other parts to do the motor control, the motors are AC but with brushes which is easier and harder at the same time image

     

    Hopefully tonight i'll have time to solder up connectors on one of the TOF boards (just soldering jumpers in for now) and breadboard it with the oled into a laser tape measure with the arduino. Assuming that goes smooth i'll lay out the other parts and figure out what i'll need to 3d print for it enclosure wise, and any other features that might make sense (like a row of 10 or 20 leds that represent the % of power for instance) over the weekend.

Comment

  • So after some struggle, i've worked out the pinout on the breakoff portion of the TOF boards. It appears ST "intends" for them to be used with their nucleo eval board setup which with header sockets soldered on it would directly plug into. the VL53L1X portion of the boards has direct contacts that are marked, but the other side doesn't.

     

    More entertainingly, my wife has conned me into a specific project for her using the box.... She lately has been into restoring old sewing machines. She has a variety ranging into the 1950s, and some of them have some really interesting mechanics primarily related around pop in cam systems to do designs and patterns. But she also has 2 100+ year old singers with motors, a whopping 1/20hp. One was overall in fairly decent shape and she already has that one restored to usable and maybe just needs a little cosmetic help but isn't bad overall.

     



    The other one is kind of a mess all around, seized up, etc. She's already managed to sneakily talk me into (as if it was my own idea) to use some of my chromaflair pigment to paint it after she's taken it apart and stripped the paint off it. image

     

    So that's got nothing to do with the box right?  Well after conning me into using the chromaflair for the other one, she then shows me a video from one of the sewing groups she's in of a woman controlling the speed of a sewing machine using Alexa. Then tells me that the woman said she can't take it over 75% because at that point the sewing machine is too loud for alexa to hear her image . She lets me talk about how impractical the idea is, because I know how to use a sewing machine and the combination of normal alexa lag time plus the way you'd really want to use it wouldn't work well. Then she sets the hook "it's useful for people who have difficulty keeping consistent pressure on a foot or knee pedal"....

     

    And so talked me into a gesture controlled sewing machine from the box. It works out almost perfectly, the phototransistor can determine the light in the room and automatically turn on the sewing machine light if its dark, the temperature sensor to monitor the motor temp, the oled to display the temp and the motor speed and the TOFs for the gesture. She's going to end up with a pretty wacky space age 110 year old sewing machine once we're done.

     

    So I need to get triac and a couple other parts to do the motor control, the motors are AC but with brushes which is easier and harder at the same time image

     

    Hopefully tonight i'll have time to solder up connectors on one of the TOF boards (just soldering jumpers in for now) and breadboard it with the oled into a laser tape measure with the arduino. Assuming that goes smooth i'll lay out the other parts and figure out what i'll need to 3d print for it enclosure wise, and any other features that might make sense (like a row of 10 or 20 leds that represent the % of power for instance) over the weekend.

Children
  • in reply to easyejl

    "...a variety ranging into the 1950s, and some of them have some really interesting mechanics..."


    There were some old machines featured in 'The Secret Life of Sewing Machines' which has now been cleaned up and shared on YouTube: 

    The Secret Life of the Sewing Machine - Remastered - YouTube

     

    May be of interest if you haven't seen it before.

  • in reply to beacon_dave

    That's pretty cool, I kinda skimmed it for now as i'm working, but i'll watch it later.

     

    The oldest computing textile machine i've seen was a working jaquard loom. That was at Greenfield Village in michigan, Henry Ford's thing. I don't really know what to call the place. It was fascinating to watch it weave.

  • in reply to easyejl

    Sarah Spencer's hacked knitting machine is pretty impressive. Handy for those customised socks and jumpers at Xmas time

     

    Hacked Star Map - Computerphile - YouTube

  • in reply to beacon_dave

    Here's the Alexa sewing machine my wife hooked me in with

     

  • in reply to easyejl

    "...she can't take it over 75% because at that point the sewing machine is too loud for alexa to hear her..."

     

    The remote microphone option may help with that - attach it to her lapel so that it is closer to the mouth to improve on the signal to noise ratio. A headset or earset mic would be even better.