Week Ten: Input Devices
Measure something
This week for me was really important, mainly, my final project consist in Input Devices to read Electro-Myographic(EMG) signals and to read spatial information with an Innetial Measurement Unit(IMU).
For the assignment I choose to measure light with a analog photoresistor and acceleration with a digital 10DOF breakboard(I only took the acceleration and left the gyroscope, magnetometer and temperature sensor out).
Designing the modular board
1) AT45 MOD. 5V
-First thing I did was to check if it was possible to desarm the board into a minimal modular circuit to be used on many analog sensors without wasting components. I checked all the sensors used before in previous Fab Academies and gave me the chance to design it.
2) AT45 MOD. 3.3V
-This board was the same as the other one but with the difference that this has an 3.3V-0.1Amp voltaje regulator and works with a 3.3V USB to FTDI adaptor, most digital sensors work around this voltage.
Programming the Modular Board
1) Luminosity Sensor
-This part was quick and easy, I just took Neil's files from the index, read it to see if something needed to be change, and finally uploaded the hex file to the board.
Modular Sensor Test
2) IMU Sensor
This sensor was more complicated to make it work for me, I had to research about I2C system bus and communication protocols. After reading for a while I gave it a try on Arduino IDE first to see if it works.
Acceleration in progress.
- Also, I tried to build a digital sensor with the new digital microphone but the fab library did not have any component with the same symbol or package, so I made my own with the exact specifications and size, the only downside of this was that I did not have enough time to build it or work with it due to the dificulties of its I2S communication protocol.
Files
