Week 11
Output Device: Stepper Motor
PCB Design Software: Eagle
Machine: MODELA MDX-20 (Software: Fab modules)
Components and Tools
- Attiny44 x 1 (Digi-Key)
- 1uf Capacitor x 1 (Digi-Key)
- 10k ohm Resistor x 1 (Digi-Key)
- Voltage regulator x 1 (Digi-key)
- MOSFET N-channel x 4 (Digi-Key)
- 4 Pin SMD Type Male Header x 1
- 6 Pin SMD Type Male Headers x 2 (Digi-Key)
- 6 Pin Socket x 1 (Mouser)
- PCB (FR-1) x 1
- Double-sided tape x 1
- Mitsuwa Paper Cement Solvent x 1(Amazon.jp)
- Scraper x 1
Designing The Board
I designed the circuit based on Neil’s board for the unipolar motor. The image below is the Schematic.
And this is the board. Like the previous week I created a ground plane, but this time instead of leaving the Isolate at 0, I chose 0.016 (in inches).
Making The Board
Learning from last week's mistake, this time I changed the tool diameter setting in Fab Modules from 0.4 to 0.3, and the MODELA milled all of the narrow traces. (I forgot to take a picture of the board prior to soldering so...)this is the final product.
Programming The Board
First, connect the motor board to a power source and the FabISP.
Download the c file and make file (right click link and Save link as…) and move them to a folder.
To flash the micro-controller open terminal and type the following
- cd the directory to the folder
- make -f hello.stepper.44.wave.make program-usbtiny