WS2023/24#

2023-10-05 (6 VO)#

OO: Recap #

What we know: Constructor, Methods, Objects, this
- Classes and Objects
From Functions and Methods …
- Overloading
- Methods
- this
- References
What we have

Sensor-like types
Switch-like types
- Exercise: Mocking Switch (Non-Polymorphic) (switch-mock.h)
Consumers
- Exercise: LEDStripeDisplay_nopoly (Non-Polymorphic)
- Exercise: Hysteresis_nopoly (Non-Polymorphic) (hysteresis.h)

Plan 💪#

Polymorphize switches and sensors ⟶ interfaces
Use interfaces in LED display and hysteresis

Show example of a display that outputs sensor values to stdout (rather than writing the output inline, inside the measurement loop)
Project: Data Logger
- Define sink
- Define source configuration
Lifetime (e.g. AveragingSensor::add()) ⟶ pointer classes
… see what time brings …

OO: Polymorphism #

From Inheritance And Object Oriented Design:

From C++ >= 11:

override

Git Collaboration (via Github, but not necessarily): Forks And Pull Request #

See Working with Git In Our FH-ECE21 Project, “Forks And Pull Requests”

Tasks, First Round #

../../../../../_images/teams-2023-10-05.jpg

2023-11-03 (6 VO)#

Organizational #

Course page modifications (chapters instead of table)
Grading scheme

OO: Design?#

Look over integrated pull requests
- ConstantSensor
- RandomSensor
- MockSensor
- AveragingSensor
  - Dependencies: does it really need sensor-mock.h?
  - ⟶ UML sketch
UML Short Introduction
⟶ Design patterns (Composite)
What was that all for?
- Structure: Sensor interface
- override
- OO Design Principles
- Design patterns (outlook)
  - Composite
  - Adapter
  - Many more: Design Patterns With C++

Project #

Hardware Overview#

Intro: sysfs GPIO (see SysFS GPIO Switch)
Linux and OneWire (using DS18B20 Temperature Sensor as Slave) (class W1Sensor implements that, in our project)
PWM Userspace Interface (using PCA9685) (see Temperature Display: LED Via A PWM Controller)

Tasks#

See WS2023/24: Group Project - Tasks

2023-11-09 (3 VO)#

Project #

Caring about hacking students

2023-11-10 (3 VO)#

Project #

Caring about hacking students
Team meeting

../../../../../_images/2023-11-10-uml.jpg

2023-11-17 (3 VO)#

OO, And Software Development At Large #

OO Design Principles

See SysFS GPIO Switch and (DONE) Boiling Pot (The Beginning) for why.
- Single responsibility ⟶ Hysteresis does not do sensoring and switching itself; it uses an interface
- Open/closed ⟶ Hysteresis is not modified when a new Sensor implementation is added
- Liskow substitution ⟶ Hysteresis should be possible to use any Sensor. Easily violated!!
- Interface segregation ⟶ Sensor does not have a name in it. Data logger would need one, but adds it itself (SensorConfig is a name ⟶ Sensor mapping)
- Dependency Inversion ⟶ Hysteresis does not depend on, say, W1Sensor, but rather on Sensor

Project #

Updating A Fork From Upstream#

Look over Working with Git In Our FH-ECE21 Project
Reasons to “sync” a fork
- GCC warning: “Structured binding only available for C++17” ⟶ -std=c++17 at toplevel CMakeLists.txt
- Continuous development cycles on fork, repeated pull requests from the same fork
Presentations: where we are, with
- (DONE) Boiling Pot (The Beginning)
- Temperature Display: LED Via A PWM Controller

2023-11-20 (6 VO)#

Container Templates (`std::map`)#

std::map

Project #

New Tasks: MQTT And CSV `Sink` Implementations#

MQTT
- MQTT
- Data Logger: MQTT Sink (task definition)
Data Logger: CSV Sink

Datalogger Pull Request#

See today’s meeting minutes in (DONE) Data Logger

Boiling Pot, Switches#

See today’s meeting minutes in (DONE) Boiling Pot (The Beginning)
Team to continue on tasks/switch-interface

SysFS GPIO Switch#

See today’s meeting minutes in (DONE) Boiling Pot (The Beginning)

2023-12-07 (6 VO)#

Project #

Structure#

firmware/: what’s supposed to be deployed: data-logger and boiling-pot
demos/: demo and test programs
toolcase/: library, structure into subdirectories
- base/
- data-logger/
- boiling-pot/
tests/ …

Show dependency graph

Renames#

LEDDisplay -> PWMController

2023-12-14 (6 VO)#

Project #

WS2023/24: Group Project - Tasks

Datalogger#

(DONE) Data Logger
- Status: couple of minor tweaks (see “Standup records” in (DONE) Data Logger)
Followup tasks

Boiling Pot#

Peripherals#

Temperature Display: LED Via A PWM Controller
SysFS GPIO Switch
(DONE) Switch Interface
Followup tasks
- Display Interface/Infrastructure

2024-01-08 (6 VO)#

Project #

Close task Boiling Pot: Basic Integration
- Bonus points for switch
- Bonus points for Pi donation
- Bring relay board and cooker, and a gapher tape
Bring Data Logger: Integration to an and
- Use a real sensor
- Coordinate with Data Logger: CSV Sink and Data Logger: MQTT Sink
- Integrate those using a composite sink
Display Interface/Infrastructure, and Boiling Pot: Display, And Status Reporting
- Status: do we have an interface? If not, make it so!
- Integrate into firmware/boiling-pot.cpp ⟶ see test cases mentioned in Boiling Pot: Display, And Status Reporting

2024-01-11 (6 VO)#

Project #

BIG FAT SYSFS-GPIO NOTICE: NO SAFETY