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ino - 4.99 kB - 09/01/2018 at 15:43
The following tools were used in this project:
I used the following hardware parts for my project:
The links above are only a suggestion of where you can find the items used in this tutorial (and maybe support my future tutorials). Feel free to search for them elsewhere and buy at your favorite local or online store.
The first part of this project was the assembly of the robot structure.
In previous projects I developed the structure of my own robot, using easily accessible materials (without the need for complex tools, 3D printers or laser cutting machines). You can find this project in the link below:
This time I decided to give a chance for a robotic kit obtained from an online store. You can find a link to the robot chassis at the following link: http://bit.ly/2ycI8fP. If you're looking for a kit, I think it's a good option!.
At first it seemed that the assembly would be complex or that I would run into problems like the lack of parts (given the amount of parts that make up the kit). But this kit really surprised me! All the pieces seem to me of good quality, and several spare parts accompanied the kit. Thus, a screw lost underneath the workbench won't make it impossible to carry out your project, which I found to be excellent (especially after losing a couple of screws).
Another positive point is that all the tools needed to mount the robot are included in the kit (a couple of Allen wrenches and the screwdriver). I believe this makes the kit excellent for starters who doesn't have lots of tools!
As a negative aspect I would highlight the lack of documentation. The robot's assembly manual (a spreadsheet file in Chinese) is not extremely user friendly, and there isn't a lot of tutorials online for that tank. And so I decided to document the process of assembling my robot in the video above! Another point of attention concerns the material of the robot structure. The base is entirely made of aluminum, which can cause some short circuit if the pins of the printed circuit boards touch the frame.
There are other online kits that you can use. You can even maker your own structure, as I described above.
In the video above I show you how you can assemble the electronics in the robot structure.
A power pack made of three 18650 batteries was installed on the back of the robot. It provides 11.1V (3 x 3.7V) to the robot. That's enough to power the 12V DC motors.
A L298N dual channel H-bridge was used for the control of the motors. It receives some 3.3V signals of the Wemos board, and provide higher voltages for the motors. It also allow the motors to run in both directions, depenting on the combination of those input signals.
Each device was connected according to the schematics.
Follows a list of the pins you'll need to connect:
Wemos D1 inputs/outputs:
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