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 New Language Features:

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