Pico Timer Project using Pico with Proteus Simulation

Introduction

Timers are one of the most important features in embedded systems because they allow microcontrollers to perform tasks at precise intervals without constant CPU intervention. In this microcontroller project, we demonstrate how to use the Timer module of the Raspberry Pi Pico using MicroPython inside a Proteus simulation environment.

This project is a simple yet practical DIY electronics example where the onboard LED of the Raspberry Pi Pico blinks at a fixed interval using a hardware timer. Instead of relying on delay loops, the timer triggers a callback function periodically, making the design more efficient and closer to real-world embedded systems development.

The project is useful for beginners learning MicroPython programming, Proteus simulation, and basic firmware design for modern microcontrollers.

How the Project Works (Overview)

The project demonstrates how a hardware timer can automatically execute a task at fixed intervals.

The Raspberry Pi Pico initializes a Timer object configured in periodic mode with a frequency of 1 Hz. This means the timer triggers once every second. Each time the timer fires, it calls a callback function named blink().

Inside the callback function, the state of the onboard LED is checked. If the LED is currently ON, it turns OFF. If it is OFF, it turns ON. This alternating behavior results in a continuous blinking LED effect.

Because the timer controls the blinking process, the main program loop remains empty, showing how embedded firmware can rely on interrupt-like timer callbacks instead of blocking delays.

Workflow Explanation

The workflow of this Proteus simulation project is very straightforward:

1. Raspberry Pi Pico Initialization
   The microcontroller boots and initializes the MicroPython runtime.

2. GPIO Configuration
   The onboard LED pin is configured as a digital output.

3. Timer Initialization
   A timer object is created and configured in periodic mode.

4. Timer Callback Execution
   Every second, the timer automatically triggers the blink() function.

5. LED State Toggle
   The callback function switches the LED state from ON to OFF or vice versa.

6. Continuous Operation
   The system runs indefinitely while the timer keeps triggering.

Key Features

• Demonstrates Timer module usage in MicroPython

• Uses Raspberry Pi Pico RP2040 microcontroller

• Fully functional Proteus simulation project

• Non-blocking LED blinking using hardware timers

• Beginner-friendly embedded systems example

• Minimal code with efficient event-driven firmware

• Useful introduction to interrupt-style programming

Components Used

From the schematic and source code, the following components are used:

• Raspberry Pi Pico (RP2040)

• Onboard LED

• Timer module

• Proteus VSM MicroPython simulation environment

No external components are required because the Pico’s built-in LED is used for visualization.

Applications

Although this is a simple demonstration, the same concept is widely used in real embedded systems.

Common applications include:

• LED status indicators

• Real-time sensor sampling

• Periodic data logging

• Embedded system scheduling

• IoT device task management

• Communication polling systems

• Watchdog monitoring tasks

Timers are fundamental in firmware development, especially when implementing real-time operations.

Explanation of Code

The firmware is written using MicroPython for the Raspberry Pi Pico and simulated in Proteus VSM.

Library Import

The program imports:

• Pin → Used for controlling GPIO pins

• Timer → Used to schedule periodic tasks

GPIO Setup

The onboard LED of the Pico is configured as an output pin, allowing the program to control its state.

Timer Object Creation

A Timer instance is created. This timer will later be configured to trigger at a specific frequency.

Callback Function

The function blink() is executed every time the timer fires. It simply toggles the LED state between ON and OFF.

Timer Configuration

The timer is initialized with:

• Frequency: 1 Hz (once per second)

• Mode: Periodic

• Callback: blink() function

Main Loop

The infinite loop keeps the program running while the timer operates in the background.

This structure demonstrates event-driven embedded firmware design.

Source Code

# Processor: PI PICO
# Compiler:  MicroPython (Proteus)

# Labcenter Sample Design


# Libraries
from machine import Pin, Timer

# Setup
led = Pin("LED", Pin.OUT)
timer = Timer()

⬇ Download file

Complete Source Code

Proteus Simulation

In the Proteus VSM for MicroPython environment, the Raspberry Pi Pico model executes the MicroPython firmware exactly like real hardware.

When the simulation starts:

1. The Pico initializes the timer.

2. The timer triggers every 1 second.

3. The callback toggles the onboard LED.

4. The LED continuously blinks inside the Proteus simulation.

This allows developers to test embedded systems logic, debug firmware behavior, and validate microcontroller projects without physical hardware.

Conclusion

Complete File

⬇ Download file

Pico Timer Project using Pico with Proteus Simulation

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Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough...