Daniel García

For the assignment of this week I'll make a Hello.Light board to measure the intensity of light. The first thing I do is download the documentation I need from web of the class of this week. Here I find the components of the board, the traces, the c code, the makefile and python file for visualizing the data.

To work in Python first I have to install it on your computer, and install the pyserial for python to communicate with the board through the FTDI wire connected to the USB.

For display the data in graphics, Python is going to use Tkinter, so I also have to install it.

step 1: making the board

From the image of traces I get the paths to drill de board and I weld the components as we made in the previous assignment.

Step 2: programming the board

In the windows console (for windows users like me), go to the folder where you downloaded the makefile and the c code and run them.

Important: add the port where the FabISP is installed, if we don't do it, we will get an error and we will be asked to specify the serial port.

make -f hello.light.45.make program-usbtiny COM5

If it works, the console will show the following text:

avr-gcc -mmcu=attiny45 -Wall -Os -DF_CPU=8000000 -I./   
-o hello.light.45.out hello.light.45.c  
avr-objcopy -j .text -O ihex hello.light.45.out hello.light.45.c.hex;\  
avr-size --mcu=attiny45 --format=avr hello.light.45.out  
AVR Memory Usage  
----------------  
Device: attiny45    

Program:     426 bytes (10.4% Full)  
(.text + .data + .bootloader)    

Data:          0 bytes (0.0% Full)  
(.data + .bss + .noinit)      


avrdude -p t45 -P usb -c usbtiny -U flash:w:hello.light.45.c.hex    

avrdude: AVR device initialized and ready to accept instructions    

Reading | ################################################## | 100% 0.01s    

avrdude: Device signature = 0x1e9206  
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed           
To disable this feature, specify the -D option.  
avrdude: erasing chip  avrdude: reading input file "hello.light.45.c.hex"  
avrdude: input file hello.light.45.c.hex auto detected as Intel Hex  
avrdude: writing flash (426 bytes):    

Writing | ################################################## | 100% 1.27s        


avrdude: 426 bytes of flash written  
avrdude: verifying flash memory against hello.light.45.c.hex:  
avrdude: load data flash data from input file hello.light.45.c.hex:  
avrdude: input file hello.light.45.c.hex auto detected as Intel Hex  
avrdude: input file hello.light.45.c.hex contains 426 bytes  
avrdude: reading on-chip flash data:    

Reading | ################################################## | 100% 0.77s        


avrdude: verifying ...  
avrdude: 426 bytes of flash verified    

avrdude: safemode: Fuses OK    

avrdude done.  Thank you.

Now we have our board programmed.

Step 3: visualizing the data

To view the data I need to install python and Tkinter on my computer.

Now from the console in windows, placed in the folder where the downloaded file hello.light.45.py are, I write in the console:

python hello.light.45.py COM5

If Tkinter is successfully installed, a window on the screen with a blue and red bar that increases and decreases appear as the light sensor get in the board.