2.3. Circuit Design in Embedded Systems
2.3.1. Introduction to embedded system circuit design
Circuit design is the process of designing an electronic circuit so that all the required components are connected correctly and work together to perform a specific function.
Main stages of circuit design
A professional circuit-design process normally follows several stages.
Step 1: Define the requirements
First determine what the circuit must accomplish.
Example:
Design a temperature-controlled fan that turns ON when the temperature exceeds 30°C.
Requirements might include:</strong
- Temperature measurement
- Microcontroller
- Fan control
- Display
- Power supply
- Protection
Step 2: Select components
Choose appropriate electronic components.
These may include:</strong
- Microcontroller
- Sensors
- Resistors
- Capacitors
- Diodes
- Transistors
- MOSFETs
- Regulators
- Relays
- Connectors
- LEDs
- Displays
Component selection depends on:</strong
- Voltage
- Current
- Power
- Accuracy
- Speed
- Cost
- Availability
- Environmental conditions
Step 3: Circuit design software selection
Before implementing an electronic circuit, you must design it by using designing software that can sometimes be tested.
Popular tools include: strong>
- Proteus
- LTspice
- KiCad
- Multisim
- EasyEDA
Step 4: Schematic diagram
A schematic diagram is a graphical representation of an electrical circuit.
schematic diagram shows:
- Components
- Connections
- Component values
- Pin connections
- Power connections
- Signal paths


