I bought a one touch about a month ago and proceeded to mod it with the typical sponge anode, foot pedal and I jury rigged the stylus to take normal needles. Then I decided to just build a machine from scratch and added an Arduino+LCD I had lying around that acts as an insertion timer, hair kill counter and a buzzer that pauses every 10s so I don't have to count 40 Mississippis in my head.
So felt like sharing since I haven't made a post here yet even though I've been reading a bunch here over the last month
The whole setup:
And it all turned out too be just as much of an eyesore as I was expecting.
The only LCD screen I had lying around was this one, unfortunately I had wired it up when I was just learning how to solder 4 or 5 years ago so it's kind of a mess and also it's attached to an Arduino shield making mounting to my 'case' close to impossible. So the Arduino just hangs out propped up against the case or on top of it at the moment
. I thought about desoldering it apart and rewiring it but decided to just order a tiny 2" touch screen for $10 (which comes Saturday, yay).
The makeshift needle holder:
To get it to take regular needles I first snapped the two metal shank pieces of a one touch needle apart and then kept the top tubular one and jammed half of one of those plastic tubes sterex needles come with inside. Then I glued the plastic bit to the metal shaft and crimped the metal tube a little bit after where the plastic tube ends. So when a needle is put in the plastic tube holds it snuggly and the crimped metal tube prevents it from being pushed down further and makes electrical contact. However it holds the needle a little too snuggly and pliers are required for removing an old needle. Electrical tape is there to keep it from sliding around when setting it down, not to hold it together.
So my next step is definitely going to be prettying it up, no point in hair removal if you can't do it in style. Then after I run out 9Vs I might change to this regulated power supply I have from a eurorack synth that has 12v and 5v rails.
Decided to go the cheap DIY route instead of to a professional since I've done a bunch of DIY audio and synthesizer projects already and had some circuits exposure in college so modding or making one would be easy for me. Also currently unemployed so limited $$ but plenty of time. Electro has been a bit difficult to learn especially at the very start (and still learning), which I expected, but not extremely impossibly hard as some DIY naysayers have warned.