Microchip ATmega328P
Arduino Uno Blinking LED
Overview
An educational Arduino Uno project featuring a simple pre-programmed blinking LED for absolute beginners with a minimal budget.
Simona CollettaSystem architecture
POWER
MCU
ACTUATOR
- POWER → MCUPowerSupplies 5V regulated power to the microcontroller VCC and GND pins
- MCU → ACTUATORGPIODrives the LED through a current-limiting resistor from digital pin 13
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| AMS117-5.0 | POWER | USB 5V Input & AMS117-5.0 Regulator Provides regulated 5V system power from USB connection | AMS(美国) | SOT-223 | 1 | Matched | |
1 alternatives consideredAI verified | |||||||
| ATMEGA328P-AU | MCU | Microchip ATmega328P Executes pre-programmed blinking firmware logic | Microchip Technology / Atmel | TQFP-32 | 1 | Matched | |
7 alternatives consideredAI verified | |||||||
| RC0805FR-07220RL | ACTUATOR | SMD/Through-hole LED with 220 Ohm Resistor Visual indicator demonstrating basic digital output toggling | Yageo | 0805 (2012 Metric) | 1 | Matched | |
Build guide
2-3 hoursBeginner
1
Procurement & Preparation
- Source and inspect the core components including AMS117-5.0 regulator, ATMEGA328P-AU microcontroller, and RC0805FR-07220RL 220 Ohm resistor.
- Prepare the PCB stencil and layout the components on the anti-static workbench.
2
Hardware Assembly & Wiring
- Apply solder paste to the PCB pads for the USB 5V input and AMS117-5.0 regulator module.
- Place the Microchip ATmega328P-AU and the 220 Ohm resistor (RC0805FR-07220RL) onto their designated landing pads.
- Pass the populated PCB through the reflow oven to solder all surface-mount components, establishing the VCC, GND, and PB5 GPIO connections.
3
Firmware Setup
- Connect the ISP programmer to the ATmega328P-AU header on the assembled board.
- Flash the pre-compiled blinking LED firmware binary onto the Microchip ATmega328P to configure GPIO pin PB5 as an output.
4
Testing & Calibration
- Plug a 5V USB power source into the USB input to power the AMS117-5.0 regulator and system board.
- Observe the LED connected via the 220 Ohm resistor to verify it toggles on and off correctly, confirming successful execution of the blinking routine.
Document
Arduino Uno Blinking LED
An educational Arduino Uno project featuring a simple pre-programmed blinking LED for absolute beginners with a minimal budget.
Design Overview
| Item | Details |
|---|---|
| Product Type | Arduino Blinking LED |
| Key Functions | Fixed pre-programmed blinking behavior, Educational demonstration of basic microcontroller output |
| Power Source | USB 5V (via Arduino Uno) |
| Connectivity | |
| Size | Standard Arduino Uno footprint |
| Environment | indoor |
| Difficulty | Beginner |
| Est. Time | 2-3 hours |
System Architecture
Power Topology: USB 5V feeds the system power domain directly or through a linear regulator to power the ATmega328P and LED indicator.
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| POWER | POWER | USB 5V Input & AMS117-5.0 Regulator | Provides regulated 5V system power from USB connection | 5V |
| MCU | MCU | Microchip ATmega328P | Executes pre-programmed blinking firmware logic | 5V |
| ACTUATOR | ACTUATOR | SMD/Through-hole LED with 220 Ohm Resistor | Visual indicator demonstrating basic digital output toggling | 5V |
Design Schemes
Balanced Arduino Blinking LED ★
Default mix of catalog ICs and proven modules using ATmega328P.
Trade-offs: Good availability; not the cheapest or the highest performance.
Cost-first Arduino Blinking LED
Minimalist configuration utilizing bare-minimum MCU setup and direct USB power.
Trade-offs: Lower BOM; tighter margins and more software compensation.
Key IC selection
main MCU
- Need: Execute simple digital toggle logic with sufficient GPIO and flash memory for beginner-level sketches.
- Class: 8-bit AVR RISC Microcontroller
- Shortlist: Microchip ATmega328P, Microchip ATmega328PB
- Pick: Select standard ATmega328P in TQFP or DIP package based on form factor and legacy Arduino ecosystem compatibility.
voltage regulator
- Need: Step down USB 5V or external DC input to a stable 5V rail for the microcontroller logic.
- Class: Low-Dropout Linear Regulator (LDO)
- Shortlist: Advanced Monolithic Systems AMS1117-5.0, Microchip MCP1702-5002E
- Pick: Select AMS1117-5.0 in SOT-223 package for cost-effective standard linear regulation matching classic Arduino designs.
Risk register
| ID | Area | Severity | Detail | Mitigation |
|---|---|---|---|---|
| r1 | thermal | low | AMS1117 linear regulator may experience minor self-heating when powered from a higher external DC jack, though minimal for a simple LED load. | Ensure adequate copper pour around the SOT-223 tab for thermal dissipation if supporting higher auxiliary loads. |
| r2 | supply | med | ATmega328P availability and pricing fluctuations can impact low-cost educational board production. | Design footprint to optionally support pin-compatible variants like the ATmega328PB as an alternative source. |
Key Components
3/3 modules matched to real parts. See the BOM tab for the full component table.
USB 5V Input & AMS117-5.0 Regulator (AMS117-5.0)
Candidate 1 (AMS117-5.0) has a part number that exactly matches the primary MPN for the 5V fixed output regulator.
Microchip ATmega328P (ATMEGA328P-AU)
Candidate 8 (ATMEGA328P-AU) matches the primary MPN ATmega328P with standard packaging/temperature suffixes, manufacture
Build Summary
- Difficulty: Beginner
- Estimated time: 2-3 hours
- Tools required: Antistatic Tweezers, Magnifying Glass, Anti-static Mat, PCB Stencil, Solder Paste Dispenser, Reflow Oven
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: voglio creare un led lampeggiante con arduino uno