Proteus & EasyEDA Projects | easywaysimu Engineering

EW1058 Hamad Project Draft

Intelligent Room Temperature Measurement & Control

A smart climate-control prototype built around Raspberry Pi, DHT22 temperature/humidity sensing, LCD status display and relay-driven fan control. The system regulates comfort around a 25°C set point while using Proteus simulation to validate the circuit before hardware implementation.

25°C

Target set point

DHT22

Temp / humidity

LCD

Real-time status

Relay

Fan switching

Step 01

Control Logic and System Flow

The workflow starts by setting up GPIO pins and the LCD, keeping the relay off, then reading temperature and humidity. When the temperature reaches or exceeds 25°C, the relay activates the fan and the LCD updates the user with live temperature and humidity information.

Step 02

Hardware Architecture

The Raspberry Pi acts as the controller, reading sensor data and driving the LCD, LED and relay outputs. The hardware set also includes DHT22 sensing, a brushless DC fan, a Songle relay, resistors and jumper wiring for quick prototyping.

Step 03

Sensing and Display Interface

The DHT22 supplies digital temperature and humidity data while the 16x2 LCD provides a direct local interface. This makes the prototype readable without an external computer and supports immediate feedback during testing.

Step 04

Relay-Controlled Fan Output

A relay interface is used to switch the fan according to the control algorithm. This separates the low-current Raspberry Pi GPIO logic from the higher-current fan output and makes the design safer for actuation.

Step 05

Proteus Circuit Validation

The Proteus schematic validates the Raspberry Pi-based temperature-control circuit, including LCD display, button inputs, sensor-conditioning elements and fan-output behaviour before physical implementation.

Step 06

Hardware and Software Output

The implemented prototype demonstrates live LCD output and script execution. The Python program configures GPIO, reads the sensor or ADC channel, updates the desired temperature and controls the relay and LED feedback loop.

Project Gallery

Additional Temperature-Control Images

Extra images from the report show the LCD, Proteus execution states, component references and simulation code used to check the embedded control workflow.

KD5080 Final Design Review Report

Smart Door Entry Visual & Vibration Alert

A low-cost assistive electronic product for hearing-impaired and elderly users. A magnetic reed switch detects door movement, then an Arduino Nano activates a high-brightness LED and vibration motor so that door events are communicated visually and tactically.

< £40

Target cost

Local power

LED

Visual alert

Motor

Tactile alert

Step 01

Reed-Switch Door Detection

The door sensor uses a magnetic reed switch mounted on the door frame and a magnet on the moving door. When the magnetic state changes, the Arduino Nano reads a clean digital signal without complex signal processing.

Step 02

Firmware Logic and Alert Sequence

The Arduino firmware uses an internal pull-up input. When the reed switch indicates a door-open state, the LED and vibration motor outputs are activated, then deactivated again when the closed-door state is restored.

Step 03

Mechanical Enclosure Design

The indoor alert unit is housed in a simple ABS-style enclosure designed for accessible placement on a wall, table or near a seating area. The report includes a top and bottom housing part modelled as a rectangular enclosure.

Step 04

TinkerCAD Prototype Testing

Early validation used TinkerCAD to connect the Arduino, breadboard, reed switch, LED resistor path and motor response. The simulation checks how the circuit reacts when the magnet changes the reed switch state.

Step 05

Proteus Circuit and Driver Design

The Proteus circuit adds the transistor motor driver, LED output and reed switch interface. The vibration motor draws more current than an Arduino pin can safely supply, so an NPN transistor and flyback protection are used.

Step 06

PCB Routing and 3D Visualisation

The ARES routing stage connects the Arduino headers, resistor, transistor, LED and reed-switch connector with copper tracks. The 3D board view confirms the physical placement of the final PCB components.

Step 07

Hardware Assembly and Functional Test

The final breadboard prototype was tested by moving the magnet near and away from the reed switch. The hardware response confirmed simultaneous LED and motor activation during the detected door-open event.

Project Gallery

Additional Door-Alert Design Images

Extra images from the report cover the enclosure, TinkerCAD states, Proteus states, PCB 3D view, hardware sensor alignment, final testing and component datasheets.