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How to Make a Scrubberbot - Part 2
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Oct 11, 2024
Get ready to build a robot! This is the second video in a two part series of videos that shows you how to build the Scrubberbot robot detailed on Motbots website. In this video we'll attach the circuitry we made for Scrubberbot in Part 1, to its body and add counterweights to the motor shafts. Get your items ready (parts list on website and below), because we're going to build us a robot - that cleans! Video for Blog Page: "How to Make a Scrubberbot" Project Page and Schematics: https://motbots.com/scrubberbot/ Description: This is video 2 of 2 for the Scrubberbot robot project. Website: https://motbots.com PARTS LIST: Scrubber Pad Kit: https://amzn.to/44VMyn2 Mini PCB Prototype Boards: https://amzn.to/3wO9yHK LED Kit: https://amzn.to/4bElmv1 Resistor Kit: https://amzn.to/4amcwRt Diode Kit: https://amzn.to/4dKLd6u Ceramic Capacitor Kit: https://amzn.to/3yz5JXq Slide-Switch: https://amzn.to/3KaSeQd Brushed DC Motors: https://amzn.to/3ypcgE5 9V Battery Snap Connector: https://amzn.to/4dARfXj 9V Battery: https://amzn.to/4dHiQG3
View Video Transcript
0:00
Okay, this is the circuitry of our scrubber bot that we built in part one
0:10
I'm just going to go ahead and remove the battery and the motors from the PCB board from the PCB board
0:29
the PCB board and I'll set these off to the side. Here's the scouring pad I think is what
0:43
they called it. It's just the going to be the body of our scrubber bot. The bottom pad
0:56
is belcroed on, so we can just peel that off. I need to peel it off because I need to drill some holes
1:04
through the plastic body, and I need to gain access to put some nuts
1:12
from the standoffs that we'll put on later in the project. So what I want to do first is kind of position the PCB
1:24
onto the frame or body of the robot and I'm just going to kind of eyeball it and take a
1:33
marker a permanent marker and mark where the holes are going to go for the standoffs to
1:42
be I'm just going to have the board standoff slightly off of the plastic frame of the
1:50
scouring brush It doesn't have to be exact or anything like that
1:58
I just wanted to kind of center mine a little bit, and I also moved the PCB kind of off center lengthwise of the body
2:08
because I needed to leave some room for our 9-volt battery that will place on here later in the project
2:16
If you want to get more exact with your measurements, you can use a ruler if you'd like like I'm using here
2:24
I'm just going to measure on center from mounting hole to mounting hole on the PCB
2:35
Again, it doesn't have to be exact. I just wanted to try to make mine as neat as I could to be presentable for sharing this project to you
2:54
Okay, now I got a drill bit here. I, to be honest, I don't remember what size drill bits I use, but the size, me telling you the size doesn't really matter
3:31
It depends on the whole size based on your PCB. I think they're all pretty much the same size
3:37
But just get a drill bit size that just fits the standoff, the thread part of the standoff because you don't want your hole to be too big where you got a lot of play
3:51
and you don't want it to be too small where you can't fit the standoff stud through the plastic body of the scouring brush or the bot itself or the robot itself
4:05
So just choose the correct drill bit for yourself. It needs to be big enough where the standoff, the threaded part of it can fit and be snug but not too loose
4:21
again not too loose to you know not really hold anything I'm gonna use this piece of board here
4:28
that I had available to me and I'm just gonna use it to protect my work surface so I don't drill down through
4:37
my desk here Here is the standoff that I'm using
5:07
Again we're going to place the threaded end through the holes and it's going to stick out the bottom and that's where we'll put the nut on for it
5:21
to keep it secure. Now I'm going to use a slightly larger drill bit in order to counter sink the drilled holes. I want to use a slightly larger drill bit in order to counter sink the drilled holes. I want
5:51
the standoff to be inset a little bit more to allow for more of the threaded part to stick
6:00
through the bottom in order to get a good bite for my for the nuts to screw on and less likely to come off
6:21
So again, I counter sunk the hole to allow the brass offset to sit lower in the base and also to allow the threaded end to go through the bottom of the base more
6:51
So now I'm just going to screw in the offset and I'll do that by placing in one of the screws
7:06
that comes with the offset to allow me to screw it down into the base of the scouring brush
7:46
The threaded end of the offset sticks out just past the base enough to get the nut on
8:16
and So you can see the threaded end of the offset sticks out just past the base enough to get the nut on
8:37
The nut is still a little difficult to get on at this point
8:54
So I think it's because the burrs of the hook and loops are in the way
8:59
So what I'll do is I'll just remove the offset and then trim the hook and loops around the holes
9:05
That way, they won't be in the way of the nut itself
9:09
and I can hopefully make it easier to place the nut on to the threaded end of the offset
9:18
that sticks through the base of the scouring brush. So I'm just using these mini snippers
9:25
and I'm just going to snip away the hook and loops around the drilled holes
9:35
If you don't have any of the mini cutters, you can use these nail clippers
9:41
These are my wife's nail clippers. So they work pretty well, but they are a little more difficult to handle
9:50
because they don't have that silicon handle on them like the mini cutters do
9:58
So they're a little bit more slippery. And they also don't have the spring on the handles to
10:05
spread the handles apart every time you close down on them. So they work, but it's just a little more difficult to use than the mini clippers
10:20
You can see that these mini clippers have a spring unlike the nail clippers. It makes cutting quick work
10:27
So I didn't have anything on me at the time when I'm filming
10:35
this so I ended up using my Leatherman pocket knife and I used the pliers from the Leatherman
10:42
to help me tighten the nut on the standoff. Again, we'll just go through the same process as we did with the first standoff, and
11:44
we're going to do that for the remaining standoffs for our PCB board
11:57
Okay, now that I got all the standoffs on the base of the scouring brush for our Scrubber
12:04
I can now put on the PCB board. Once the PCB board is secure, I can now replace the brush on the scouring brush handle
13:04
So now you can see our scrubber bot is starting to take shape
13:11
Now it's time to install the motors on the scouring brush handles
13:34
These dimples on the handle are perfect for the motors to sit in
13:54
I'm going to use this double-sided sticky tape to help hold the motors in place while I try to secure them to the handle
15:07
Now I'll use a zip tie to secure the motor while I drill the holes for the permanent zip ties
15:14
Now I'll just drill holes in the handle the handle for the permanent zip ties
15:21
Now I'll just drill holes in the handle for where the permanent zip ties
15:37
will be fed through. Now I'll remove the temporary zip tie and I'll drill the next hole for the other zip tie
16:20
I drill the next hole for the other zip tie I'll just make sure that these are secured tightly now
16:50
Now I just need to put the other motor on and I'll go through the same process
16:55
I'll use the sticky tape to help hold it in place and then I'll place in the zip ties
17:20
Okay, I decided to use one of these medicine bottle caps. It's just your typical prescription bottle medication cap
17:32
I'm going to cut it in half. And I'm going to use it as sort of a counterweight for the ends of the motors
17:41
And as we go through the process, you'll see more on how this is going to work later
17:50
So I'll need to score a line on the plastic before cutting because the plastic is brittle when cutting it
18:14
I tried on a previous bottle cap and was just trying to cut it
18:19
and the whole thing just shattered the pieces. So I decided on the next one that I'd have to try to do some kind of scoring on it
18:29
where I wanted to cut it in order to prevent it from breaking apart like the first one did
18:54
Okay, now that I'm going to be. two halves of the bottle caps. I'm just going to draw some circles where I want the holes to be drilled through them in order to slip them over the motor ends
20:24
This one is rubbing a little bit on the handle, so I'll have to trim it just a little
20:40
in order for it to clear the handle and it's not going to bang up against it when
20:45
the motor is running. Okay, now I'm ready to try to secure these halves of the medication bottle caps
21:15
and I'm going to use just your typical hot glue to keep them in place
21:19
It should hold pretty well. Just be real careful when you're using hot glue because obviously it's
21:24
It's hot. Okay, in order to create a little bit more off balance for my plastic medication bottle caps, the halves that I have here
22:15
I'm going to place these orange eraser, the eraser ends. I'm going to glue them on each one, and it'll create a little bit
22:24
little bit more weight offset from the center of the shaft of the motor and that will hopefully give us a little
22:35
vibration or enough vibration to move the whole robot and having two motors on here will in
22:42
theory give us better movement for the scrubber bot and that was the whole reasoning behind
22:49
having two motors and installing the DuPont connectors onto the PCB in order for us to
22:57
switch around the wires of the motors attached to the PCB board. Not only did the DuPont
23:06
connectors give us the ability to remove the motors whenever we need to, but we can switch them
23:11
around in order to change the direction of the spin of the motors. So the reasoning was because it
23:18
It would allow me to do some experimentation on the movement of the scrubber bot itself and how it reacted
23:26
based on having the capability of switching the connections of the motors back and forth to try to give me better movement out of the scrubber bot
23:38
And you can try the same thing yourself and experiment more on that if you'd like to
23:51
Okay, now I just need to attach our 9 volt battery to
24:21
the scrubber bot body and to do that I'm just going to use this double-sided sticky
24:26
tape again I'll just place it onto the battery and then stick the battery straight
25:13
I'm going to need to lightly tighten a zip tie around the motor wires so they don't travel over towards the motors when the motors are spinning and get caught because that did happen to me one time in testing the scrubber box
25:27
After I was finished installing the motors and I turned it on and one of the motors, or not the motor, but the white plastic medication cap got caught in one of the one of the motors, or not the motor, but the white plastic medication cap got caught in one of the one of the motors
25:43
of the wires to the motor and it snapped off one of the eraser ends and it also pulled the wire
25:49
to the motor off of the PCB board, which then made the motor stop. But it wasn't a big deal. It
25:55
didn't hurt anything. I just had to re-glued the eraser back to one of the medication bottle caps
26:02
So that's why I'm putting the zip tie here in order to try to attempt to keep the wires
26:07
from moving around so much and getting too close to the spinning motors
26:13
There it goes, it's working. As I said before, we can switch around the wires of the motors to make them spin in opposite directions
26:38
Doing so might make the robot change. Doing so might make the robot change the way that it moves so we can test this out
27:43
So we can test the robot's movement even more by changing the weight on either side of the spinning motors
27:52
And the way I'm going to do that is by using a pencil to accomplish this
27:58
And what I'll do is I'll just insert a piece of this pencil
28:03
I'll have to cut it, but I'll insert a piece of it. And that will allow me to add a little extra weight to one side or the other of the
28:12
the scrubber bots motors, I can place that pencil in either eraser end on either side or either motor
28:22
That will create kind of a differential in spinning weight between the two different motors
28:31
I'll need to extend my mark to be able to pull the pencil out once it's trimmed
28:36
I don't want to cut the pencil the exact same length that it fits in there because then it will be too difficult to get it out
28:42
of there I need to have some kind of grip there to be able to pull it out whenever I need to
28:49
So that's why I'm making the second mark on here to make the pencil sticking into the eraser
28:57
end a little longer so I have something to grab onto. First, let's observe the robot's movement without the pencil
29:42
Now I'll test the robot with the pencil
29:55
So again, here's our scrubber bot, and let's run some tests
30:25
Okay, now I'll switch the red-wired motor
30:38
I'll just switch its terminals around. You can see that it spins around
30:54
You can see that it spins it a little differently. Now I'm going to insert that pencil end to this side, and we'll see how differently the scrubber bot moves
32:24
And there you have it, that's our scrubber bot
32:41
I really hope that you enjoyed this project. And remember, keep at it and stay motivated
32:47
Thanks for watching
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#Robotics