Teensy tiny sensors

Get this locally with:

git clone https://github.com/aforren1/teensy-sensors

And update with:

git pull

The complete schematic can be found here:https://easyeda.com/normal/testproject_schem-02BzxvtPM.png

Other things:

• How far away can sensors be before noise is an issue?
• With the advent of the Teensy 3.5 and 3.6, what cool things can we do?
  • Better distribution across ADCs (TODO: figure out new ADC_0/ADC_1 mapping)
  • Generally faster conversion
  • Communication over the 340Mb USB
  • Audio stimulation (though latency is USB/serial latency + audio latency itself, which might still be <5ms)
  • Digital acquisition (knobs, fMRI triggers, ...)
    • Use interrupts for more consistent acquisition? Need to fiddle with priorities then

Platformio setup (Ubuntu at least):

sudo python -c "$(curl -fsSL https://raw.githubusercontent.com/platformio/platformio/master/scripts/get-platformio.py)"
# (download 99-platformio-udev.rules)
sudo cp 99-platformio-udev.rules /etc/udev/rules.d/99-platformio-udev.rules
sudo service udev restart

# in project directory...
platformio init --board teensy31

# to build & upload,
platformio run --target upload

# see platformio.ini for settings I like

TODO: Figure out when sudo is/isn't needed.