A simulated smart washing machine control panel developed in C++ using Mbed OS on an STM32 Nucleo-64 microcontroller. The project demonstrates embedded systems concepts including GPIO, ADC, PWM, sensor integration, user interfaces, and state-based control logic.
This project simulates the front panel of a washing machine using physical buttons, potentiometers, LEDs, sensors, a 7-segment display, and a buzzer.
Users can:
- Power the washing machine on/off
- Select washing mode
- Set washing time
- Select water temperature
- Start a washing cycle
- Monitor system status
- Receive warnings for overloads or incorrect operating conditions
The project was developed using Mbed Studio and programmed in C++.
- Toggle washing machine ON/OFF
- Green LED indicates power status
- Startup and shutdown buzzer tones
- Prevents interaction while powered off
- Starts washing cycle
- Red LED indicates machine running
- Checks:
- Water temperature matches user selection
- Enough clothes detected
- Completion melody after cycle finishes
Three selectable washing modes:
| Mode | Motor Cycle |
|---|---|
| A | 100 Cycle |
| B | 200 Cycle |
| C | 300 Cycle |
Displayed on the 7-segment display.
Three wash durations:
| Display | Time |
|---|---|
| 2 | 20 Minutes |
| 4 | 40 Minutes |
| 6 | 60 Minutes |
RGB LED indicates selected temperature.
| Colour | Temperature |
|---|---|
| 🔵 Blue | Cold |
| 🟠 Orange | Warm |
| 🔴 Red | Hot |
- Detects clothing level
- Warns when overloaded
- Activates:
- Red warning LED
- Buzzer
- Serial warning message
- Detects water temperature
- Green LED indicates water has reached desired temperature
- Detects whether enough clothes are inside
- Green LED confirms sufficient load
- STM32 Nucleo-64
- Breadboard
- Push Buttons ×3
- Potentiometers ×3
- RGB LED
- Green LEDs ×3
- Red LED
- Passive Buzzer
- 7-Segment Display
- Light Dependent Resistor (LDR)
- Temperature Sensor
- Force Sensitive Resistor (FSR)
- Jumper Wires
| Component | Pin |
|---|---|
| Button 1 | PC_10 |
| Button 2 | PC_11 |
| Button 3 | PD_2 |
| Potentiometer 1 | PA_5 |
| Potentiometer 2 | PA_6 |
| Potentiometer 3 | PA_7 |
| LDR | PC_2 |
| Temperature Sensor | PC_3 |
| Force Sensor | PA_1 |
| Green LED 1 | PC_1 |
| Green LED 2 | PB_0 |
| Green LED 3 | PA_4 |
| Red LED | PC_0 |
| RGB LED | PB_3, PB_4, PB_5 |
| Buzzer | PA_15 |
| 7-Segment Display | PA_11, PA_12, PB_1, PB_15, PB_14, PB_12, PB_11 |
- Mbed Studio
- Mbed OS
- C++
- CoolTerm (Serial Monitor)
│── main.cpp
│── structure.txt
│── .gitattributes
│
├── docs
│ ├── block diagram.png
│ ├── photo of the breadboard layout.jpg
│ └── Pin Allocation - Unit 4.jpg
│
└── media
└── demo.mp4
Power ON
│
▼
Select Mode
│
▼
Select Time
│
▼
Select Temperature
│
▼
Read Sensors
│
▼
Conditions Met?
│
┌────┴────┐
│ │
Yes No
│ │
▼ ▼
Run Wait
Cycle Display Warning
│
▼
Complete
***** POWER ON - SELECT MODE, TEMPERATURE AND TIME *****
***** MODE A SELECTED *****
***** TIME SET TO 20 MINUTES *****
***** TEMPERATURE SET TO HOT *****
***** MACHINE RUNNING... *****
MODE SELECTED = A
TEMPERATURE = HOT
TIME = 1200000 ms
MOTOR = 100 CYCLE
This project demonstrates practical experience with:
- Embedded C++
- STM32 Nucleo Development
- Mbed OS
- GPIO
- ADC
- PWM
- Sensor interfacing
- State machine design
- Serial communication
- Modular programming
- Hardware debugging
- Breadboard prototyping
- Implement actual DC motor control
- LCD/OLED display interface
- EEPROM for saving user settings
- Real-time countdown timer
- Interrupt-driven button handling
- Non-blocking software timers
- Improved debounce logic
- Finite State Machine (FSM) architecture
- Low-power operating modes
- PCB implementation
A demonstration video of the project is available here:
**Atiq Mufaqqir **
This project is intended for educational purposes as part of the ELEC1620 Embedded Systems coursework.