MEP EP#338: Feature Complete or Minimal Viable ProductsProject DiffProbe
Landed on the topology Stephen wants
High voltage dividers
Compensation capacitors
CMRR calibration (120dB rejection)
Offset correction
Buffers and Instrumentation Amplifiers
Differential Stage
10x and 100x attenuation means offsets have to be bang on
Opamps (3 of them)
Buffers
Low input bias current
Low offset
Bandwidth?
Differential amp
Low offset. Capable of driving 50 ohm load to the scope
Gain setting resistors
Vishay ACAS 0612 - Precision resistor network
4x0603 resistors to make a diff amplifier with a gain of 2
Relative tolerance of 0.05%
Worst case relative temp-coefficient 15ppm
Project Snackey
Firmware is “feature complete”
Display Commands
How the vending motors actually work
INA219 Current Sensor
Interrupts
Improved method for next revision?
The one byte Serial Buffer problem
NEOPIXEL (WS2812) vs APA102 (SK9822)
Blocking functions
DMA - Direct memory access
Importance of full system integration testing
Timer Lockouts for motors
Is there a better way?
Project DiffProbe
Project Snackey
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