bath/README.md

Bachelor Thesis Tex-files

Timeline

Date
7.6.	Start
14.6.	Table of Contents
9.8.	last possibility for "first draft"
30.8.	Deadline
6.9.	Kolloquium

## Content

- I2C - v2 - [x] Umbau - [x] **packed** union based data structures (removes the need for magic numbers - [ ] safe types inside `pi2cproto.h` - [ ] ~~old~~ - [x] ballast - [x] reused - remaining compatability to v1 - [ ] new - [x] UUID readout - [x] r/w-ablility for both 1.8V potentiometers - [x] raw memory mapping - [x] why is `mon48v = 0x11`? - missing `__attribute__((packed))` declarations - [x] why are `digipoti` and `anapoti` only readable from `0x02` and `0x04` not partial? - same as above - [ ] instability on mass spi communication - timebased / overflow ?

• Calibration

  • characterize adcbehaviour
    • plot resulting fitted incline of $\Delta$V vs. num. of readcycles
    • see if v_pin same as v_keith_pin
      • on dV of small enough -> adc circuit working correctly -> calib
    • reasoning for using a given sampleTicks value
      • smallest gain error -> inconsistent
      • smallest offset -> inconsistent
      • hightst samplerate -> sampleTicks = 1
      • pin plot -> sampleTicks = 0 is no go
      • pin plot -> sampleTicks in 1-7
  • polynomials
    • polynomials rw-able
  • 10I calc
  • differences between PIts?
    • if yes then we need a PITDB
    • if not then we can hardset those values
  • ADC vs. Keithley
    • redo after selection of sampleTicks value
      • 48V
      • 10V
      • 1.8V
    • calibrate based on fit
      • 48V
      • 10V
      • 1.8V
  • ADC vs. EL
    • without calib
      • 48I
      • 10I
      • 1.8I
    • with calib
      • 48I
      • 10I
      • 1.8I
  • Temp
    • accuracy
    • position in system
      • inside chip -> on underside of board, between frame and board
    • relevancy
      • peace of mind if readout correct and not too high (no experience)

• 1.8V Regulation

  • compare regulation concepts
    • there's overshoot: less oscillation is good, as long as we don't take forever to achieve those
    • stabilize
  • regulate the system (with missing information)
    • write / formulate approach and resulting formula / algorithm

ToC

• Introduction
  • What is this about?
  • What's the PowerIt Subsystem?
  • Goals
    • Firmware
    • Calibration
    • Regulation
• Theory
  • Hardware Component Behavior
  • ADC Calibration
  • 1.8V Output Regulation
• Experiments
  • Setup

    • Hardware

    • Softwarestack

      graph LR;
          fw[PIt Firmware] --- pot[Potentiometers];
          fw --- srv["PItStop Server (RPi)"];
          srv -.- agg[PItStop Aggregator];
      

  • Characterization
    • Voltages
    • Currents
  • after Calibration
    • Voltages
    • Currents
  • 1.8V Regulation
    • Characterization of Dropoff
    • after Correction
• Results
  • Firmware
    • I$^2$C mapped register- Table
  • Calibration
    • Calibration-Table
    • "How to calibrate a PowerIt"
  • Regulation
• Outlook