Videos - The Coin Bot

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00:00:00	hello everyone and welcome back to the channel um if you've been following along you know that I am trying to build a robot that's capable of sorting coins by date and if I can do that then I will be able to automatically sort coins and
00:00:14	find the ones that I'm interested in keeping for my own Penny collection now in the last video we talked about this coin Grabber mechanism and we showed how that can be uh driven by a ster motor which I have under here and a belt
00:00:30	a GT2 timing belt now that belt will rotate this coin Grabber through each of the three positions and we showed that there are now bearings under there that will help to allow this to rotate with less
00:00:47	friction now as we put a penny into position here you can see that as we rotate it past this one Cog it'll pop into position there and then it will get help on to firmly and then we can rotate that over the camera position here so we
00:01:05	showed in the last video that that works pretty well it will perfectly Center the penny right there under the camera position and we will have a camera above it and a camera below it and we'll take two pictures of it one for each side of
00:01:22	the coin and as I was thinking about this machine I was thinking that I need to think of this in layers so in this first layer of the machine it has its photograph taken and then gets dropped into the next layer but that next layer
00:01:38	we haven't really talked about uh the coin sorting mechanism if you look at the earlier videos that go along with this project you'll see that my initial idea was to have the coin drop into the center of a coin sorder but as I got
00:01:54	looking at my the way I'm designing the machine now with this rotary coin grabber I realized that I won't be able to drop the coin into the center and if you remember my prototype camera that is
00:02:09	about 70 mm long so that would be sticking up underneath this whole apparatus here and that would actually get in the way of allowing the coin to drop through the center here and as you can see we're moving from the C the coin
00:02:27	from the camera position over to the coin sorting position position and that is also off center now we'll need to find some way to keep the sorder clear of this camera position and then we can rotate this piece around so that the
00:02:43	coin comes out to the edge here and then can be dropped into uh different containers or different buckets but as far as the coin sorder mechanism is concerned basically I was looking for a design where you could drop a coin
00:02:57	anywhere on this mechanism and it would automatically be moved out to the edge and I was thinking about what that would look like if you drop this here and you want it to slide out to there you'd want to have a ramp that goes here and again
00:03:11	like if you had a ramp if you dropped it here you'd want it to slide out here if you dro the coin over here you'd want it to slide over here or here the more I got thinking about it I was going to build different layers you could drop
00:03:22	this anywhere on the edge and it'll move out to here and I was thinking about putting like a some sort of roof on that but none of that seemed to work and then um I had a bunch of filament left over so I came up with this uh genius idea I
00:03:37	was using up all the excess filament all the little odds and ends of filament I had and I came up with this idea you can see that I can drop a penny anywhere on here and it will always end up going out to that Outer
00:03:52	Edge hole and as we rotate that hole around we can do that with a stepper motor also as we rotate that around we'll be able to drop the the pennies into various bins so this was my first prototype and that seemed to work pretty
00:04:06	well but there was a few tweaks that I wanted to make because first of all I thought this was a little bit too thick so I did a bit of refining and this is what the finished product look like again you can see that I'll be able to
00:04:18	drive this with a GT2 belt just like I did the coin Grabber in our last video I put a bearing in the center here so that can rotate more freely and I also have that ramp effect going on here so that anywhere again anywhere you drop a coin
00:04:36	it will always move off to the edge in that Center so that we can sort them more effectively and this is the minimum height that I felt comfortable that anywhere you drop the coin it will always end up in this hole that's what
00:04:51	she said if this coin drop can't be in the center then we're going to have two circles that are offset kind of like this and that kind of indicates what the machine's overall Dimension should look
00:05:05	like but if you include the stepper Motors that need to be included in here that ends up looking like a big circle this is the finished top down view of the robot this coin Grabber mechanism will now move into this circular piece
00:05:21	and then we'll have another stepper motor that points downward so we actually have the first two layers of the overall coin bot set up here so this is kind of exciting so as we move through this you can see that we have
00:05:35	the coin Grabber we have the coin sorder now these are going to Stu on top of each other like this so I think we're well on our way to getting an overall robot here I think that's enough for this video um if you want to see the
00:05:49	next few layers come together just stay tuned here's a little sneak peek of what's coming up next in the next few videos we're going to watch the coin drop through the next few layers and then get sorted out into various bins
00:05:57	but for now that's my two cents thanks for watching everyone have a great [Music] day