{ Fab Academy 2015 : Koichi Shiraishi }

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- Week 10: Input Devices -

Weekly Assignment

• measure something: add a sensor to a microcontroller board that you've designed and read it

1: Testing input devices

As start of this week, I tested below sensors with “Arduino UNO”.

1. Digital ultrasonic distance sensor
2. Digital motion sensor
3. Analog ambient sensor
4. Analog Grayscale sensor

Digital ultrasonic distance sensor

Digital motion sensor

Analog ambient light sensor

Analog Grayscale sensor

2: Making circuit

I decided to make temperature sensor. I downloaded the “traces” and “interior” from “this week page of Fab Academy.”

I tried to make circuit by laser. Therefor, I converted these data to vector data by "Illustrator".

I use “Trotec Speedy 100 flexx(CO2>60W Fiber>30W)” I rectify the parameters.

Parameters: 1000dpi

Processing	Laser type	Power	Speed	Path
Pattern engraving	Fiber laser(30W)	85%	5%	2 times
Outline cut	CO2 laser(60W)	65%	2%	4 times

I used a paper phenol board. It exfoliate by irradiating high power laser. Therefor I tried test cut many times.

3: Soldering the parts

4: Setup the board

I set up the “Hello temp board” in reference to “Kazutoshi tsuda’s Fab academy page.”

I downloaded “hello.temp.45.c”,“makefile” and “hello.temp.45.py” from “this week page of Fab academy.”
I also downloaded and installed the CrossPack for AVR development, because I use AVRISP mk2.

I open new project in Xcode and save the project. I moved the "Makefile" file and "main.c" file to the "firmware" folder in “projectx.xcodeproj.” (In this example, I rename from "Makerfile" to "hello.temp.45.make", from "main.c" to "hello.temp.45.c", respectively.)

After connect the “Hello temp board” and “AVRISP mk2”, I opened Terminal, moved to the "firmware" directory, and type:

				$ make -f hello.temp.45.make program-avrisp2
			

After then, I check the port in "firmware" directory.

				
					$ ls /dev/tty.*
				
			

I got a list of all of my serial ports, and picked the “usbserial-A4001CMh” that I would like to open.

5: Running python script

I use “Python 2.7.6” I install some modules for using Python script. At the onset, I installed “pip.”

				
					$ sudo easy_install pip
				
			

After then, I installed “Pyserial” which encapsulate the access for the serial port.

			
				$ sudo pip install pyserial
			
		

6: Measuring temperature

I moved to the directory which has been placed “hello.temp.45.py”, and type:

				
					$ python hello.temp.45.py /dev/tty.usbserial-A4001CMh