Thomas Kelly / EagleCAD - History

Added SD Card

Forgot to add bypass cap to the SD card reader

Added SD Card reader

TODO: Verify if we need to use 3V3 or 5V for the SD card. If it's 3V, then we need to add in a level shifter between ATMEGA and the card.

Version 2_UPDATED_ADC

Added in voltage regulators, power and programming headers, and bypass capacitors
TODO: Still need to add in SD card reader circuitry.

CHECK: Do we need to set AGND on the ADC to the sensor ground? Is the 0.5V regulator going to produce a steady reference voltage? What is the voltage for the strain gauges (UPDATE R2 VALUE WHEN WE KNOW)?

New board with updated ADC1256 from TI

TODO: Redo calibration circuitry to be single-pot per bridge (REMOVE 1 pot chip), and add in 370 and 5k resistors as done in previous board versions
TODO: Add in programming header, SD card reader, and voltage regulators.