Week 10 Output devices

Weekly Practices

I found this week a little bit easy as I had some knowledge about electronics in the maker maker diploma . Thanks to our Instructor who guided us in week 8 to have a pcb with pin headers on all GPIOs . I used that fabricated attiny1614 from week 8 to practice different types of output devices on it.

Example of LED :
I used Prof Neil’s arduino C code hello LED code .

Big thanks to our instructors who provided us with mosfet board which acted as a switch and control the output devices through it

Here is the video LED with mosfet.

Example of display:
I then practiced on a small LCD 16 x 2 with a 12c module , at first I couldn't find a complete code with a liquid crystal library. Special thanks to amany ayman who gave me the code needed.
This is the new code
//Compatible with the Arduino IDE 1.0 //Library version:1.1 #include #include LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display void setup() { lcd.init(); // initialize the lcd lcd.init(); // Print a message to the LCD. lcd.backlight(); lcd.setCursor(3,0); lcd.print("Hello, world!"); lcd.setCursor(2,1); lcd.print("Ywrobot Arduino!"); lcd.setCursor(0,2); lcd.print("Arduino LCM IIC 2004"); lcd.setCursor(2,3); lcd.print("Power By Ec-yuan!"); } void loop() { }

Example of DC motor: I also practiced on a small geared dc motor as it is one of the output devices. And I used a normal fade example to operate on a DC motor.

File: fade arduino code.

Example of speaker:
It was turn to explore the speaker - I used both a small buzzer and the Lab’s big speakers . For the buzzer I used the fade example code with it.
As for the other speaker, Prof Neil’s C code so that is why i had to use the previous board attiny44 which was fabricated on week 6 and use the command terminal tool chain to make fuse it.

Small Video demonstrating all output devices working together on a 1 signal pin for the mosfet

File: fade arduino code.

Weekly Assignments

Group assignment

Here is the link to the group assignment page.
This week’s group assignment was to measure the power consumption of an output device, so we explored yellow geared dc motor and measured its power consumption on both devices:
Power supply: current - 0.09 Amp
Multimeter: current - 8.56 M.Amp
The vast difference is observed in both devices, especially in current which is very vital for every device and electronics. The multimeter is more advanced and more accurate / precise reading compared to the power supply unit.

Our instructors had prepared for us different hello boards for various output devices so we could explore all of them in the group assignment. As none of us had done the speaker one before the group assignment day, our instructor prepared the connections and showed us hello.speaker.45. It was a really amazing adventure and very fascinating to see and understand the relationship between the power and sound. Also many of us, including me, were impressed to hear a very smooth and good tune compared to the buzzer. And we all started thinking about the amount of creativity and hard work had put into this line of work / while writing the code..

Individual assignment

As for the individual assignment I had to add an output device to a microcontroller board that I had designed and program it to do something, I chose to take this opportunity to explore fabricating a flexible pcb circuit for hello i2c board. Also I made the mosfet board as a practice and trial.
To do that I tried a new vinyl machine called vinyl silhouette cameo 3 and used the copper roll as my material. Special thanks to assistant instructor Noha, who guided me with her documentation for using the vinyl machine. And for the copper sheet settings she guided me to the fab academy link which both were very useful. To my surprise I had a perfect cut from the first trial. I was very happy because of the results and also because this was my very first flexible circuit. Also when I did an internship in fab lab Egypt I went to some tutorials like this they were also very helpful for the first timers to get acquainted with the machine and its process.

For this machine it has its own CAM software which is silhouette studio (as mentioned earlier I had already installed it) so I opened the application and inserted the trace image of hello i2c board from this link.
I specifically chose this board as I wanted to explore the display output more as I will be using it in my final project. Also found the only board which didn’t have a transistor as here in the inventory the transistor’s footprint is a little bit different so instead of designing a new from the scratch I chose a ready one to concentrate on fabrication of a new thing.
I traced the image by navigating to the object toolbar menu.
Then I had to recheck the sizes as it looked very huge compared to what I imagined.
Then from the top right I clicked on the send tab to enter the cutting settings, which is well discussed in the academy’s archive …
Force = 6
Speed = 1
I found out that the material settings weren't applicable for this material as copper was not found in the list so that is why from any material I customized it according to the instructions given in the archive.

It was recommended to use a hard backing for the copper sheet so luckily I found a plastic sheet which I used as my backing. I had stuck a small area of copper sheet on the plastic sheet and then inserted it in the machine.
For the first cut command, I tested by a square and circle which turned out to be perfect.
Then I started cutting my board which is shown in the video.

The most important process is to peel off the excess sheet area and keep the traces intack in one piece so that was a trial and error for me as due to lack of this knowledge, I had already damaged 2 traces :)
But thankfully it turned out ok.

Finally I soldered the components, which was already a new thing for me to solder on a plastic sheet. I burned out some tracks and the plastic sheet also :)
Then I burned the bootloader by reviewing week 4 and 6 and 8
Finally I uploaded the trial arduino code to check for everything was alright, by the time I prepare Prof. Neil’s hello i2c code damage on the flexible circuit was too much that i didn’t continue and was satisfied with my progress.

File: lcd arduino code.

Here are some hero shots.