Input Devices
For the Fabacademy inputs assignment I decided to make a phototransistor board and a thermistor board, thus being able to sense light and temperature. I milled both boards using the 2 profile method described in the electronics production assignment here. I used the standard .png layouts given in the lecture notes here, both of which milled successfully. I then stuffed both boards simultaneously, which saved a good amount of time - definitely getting quicker at boards. Here is the phototransistor board:
At first I couldn't get the Python code to detect the serial port, but that was easily solved using the advice in the Providence tutorial here- simply a case of finding the right name for the serial port using ls /dev/tty.usb* in the Terminal and appending it to the Python command, eg: python hello.light.45.py /dev/tty.usbserial-FTF53NJC.
Having done that, I had a working light sensor, here the computer output shown with the sensor in shadow:
And here is the thermistor board:
Light Sensor Board
I started with the phototransistor board, programming it from the C code given. At first I got some communication errors with the board, and found some continuity problems, which were easily solved with a little solder braid.At first I couldn't get the Python code to detect the serial port, but that was easily solved using the advice in the Providence tutorial here- simply a case of finding the right name for the serial port using ls /dev/tty.usb* in the Terminal and appending it to the Python command, eg: python hello.light.45.py /dev/tty.usbserial-FTF53NJC.
Having done that, I had a working light sensor, here the computer output shown with the sensor in shadow:
and here in sunlight:
Temperature Sensor board
I used the exact same method on the temperature board and got good results without any problems. Here is the computer output at ambient temperature:
and here shown after breathing on the thermistor:
