MakerBotControlSystem
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| * Describe the MakerBot thermal, electrical and mechanical system in terms of a state-space model. | * Describe the MakerBot thermal, electrical and mechanical system in terms of a state-space model. | ||
| - | * Model said system using the [http://www.gnu.org/software/octave/|GNU Octave] free open-source software (FOSS) suite of tools. | + | * Model said system using the [http://www.gnu.org/software/octave/ GNU Octave] free open-source software (FOSS) suite of tools. |
| * Design test and measurement criteria and data to generate a set of parameter estimation functions to calibrate the control system model. | * Design test and measurement criteria and data to generate a set of parameter estimation functions to calibrate the control system model. | ||
| * Generate discrete-time state-space octave model. | * Generate discrete-time state-space octave model. | ||
Revision as of 01:44, 7 May 2010
Contents |
MakerBot: Control System Design, Implementation and Characterization
Time to brush off some of that rusty old control system design knowledge I once majored in.
Goals
My goals will be to:
- Describe the MakerBot thermal, electrical and mechanical system in terms of a state-space model.
- Model said system using the GNU Octave free open-source software (FOSS) suite of tools.
- Design test and measurement criteria and data to generate a set of parameter estimation functions to calibrate the control system model.
- Generate discrete-time state-space octave model.
- Implement discrete-time algorithm using microcontroller or DSP (as required).
The Model
Controllable Parameters
Extruder
- Heater On/Off (PWM control code)
- DC Motor Voltage (PWM control code)
- Nozzle aperture diameter (fixed)
- Incoming filament diameter (fixed)
X Axis
- Stepper Position
Y Axis
- Stepper Position
Z Axis
- Stepper Position
Observable Parameters
Extruder
- Relative Nozzle Temperature (thermistor ADC code)
- Closed loop
- Calibrated Nozzle Temperature (thermocouple based digital thermometer)
- Open loop
- Incoming filament position (with encoder wheel/sensor)
- Closed loop
- Incoming filament travel (callipers)
- Open loop
- Outgoing filament diameter (callipers)
- Open loop
- Outgoing filament length (callipers)
- Open loop
- Outgoing filament mass (scale)
- Open loop
- Possibly closed loop with build platform integrated weight cells.
X Axis
- Endstop activation
- Closed loop
- Position (ruler)
- Open loop
Y Axis
- Endstop activation
- Closed loop
- Position (ruler)
- Open loop
Z Axis
- Endstop activation
- Closed loop
- Position (ruler)
- Open loop
