About my board
For this week's assignment I experienced with designing and programing a board which operate a project called Tiny CNC the Mini 3-Axes CNC v0.29 by MakerBlock. I hope this experience will provide me a backround for my final project later development.
The tiny CNC device with X, Y and Z axes, includes three micro Servo motors and some 3D printable plastic parts you can download from the linked above Thingiverse page. I deal with only the X and Y axes. Handling with programing a microcontroller board to move a point on two axes by rotating the Servos.
Experiencing with Arduino
After assembling the prehead TinyCNC device I followed the instructions I found on this page.
- wiring the Servos to the Arduino board.
- downloading these files.
- opening the MiniCNC code (located inside the MiniCNC folder) on Arduino IDE.
- checking my wiring compatible with the code.
- uploading the code to the Arduino board
- opening the serial monitor, matching the baund definition to the code and receiving an answer.
- typing a coordinate making the ‘header’ moving on the X axis following by the Y axis.
Fabricating my own board
After succeeded with programing an arduino and operating the TinyCNC I turn to designing my own board. I based my design on the Hello Servo board For a better understanding about the structure of the board and the use of the regulator I turn to compare between the microcontroller and the servo motor operating voltage through their datasheet:
working process through Eagle:
- redesigning the Hello Servo board schematic
- Adding component to the schematic
- Naming, labeling and linking the component
- Placing the components over the brd
- Tracing+Design rules
Milling with Othermill & Stuffing
Setting parameter over Otherplan and the stages to complete:
- The current tool, when changing the tool test for the Z facto
- Material: kind, size and placement
- Plans: File to upload and placement
- Milling tools:
- 1/32in for surface cleaning
- 1/64in for traces milling
- 1/32in for cutout
Otherplan alerts you if there are areas which needs a smaller tool.
Programing the Board
After completing the assignment of week eight, embedded programing, the programing went smoothly. I downloaded the files from the lecture page:
Then I located them inside a pre made folder on my computer. I navigate over the terminal to the folder and ran the make -f filename and the make -f filename program-usbtiny commands. After burning the program on my board I wired both of the servos motors and connected the board to Arduino Uno as my power supply. After completing wiring I supplied power to the Arduino Uno and it worked!!
Editing the code
Over the datasheet of the servo I found explanation about what ‘ms’ stand for. I’ve wanted to create a sketch for the TinyCNC that will draw a square. First I located both X and Y axes over point 0,0 (-90° to the left). Then I moved the X axes all length that the servo unable (90° to the right). After I moved the Y axes the full length (90° to the right). For the third side I moved the Y axes back to point 0 (-90° to the left) and at last the X axes back to point 0 (-90° to the left).download c.file download make.file