Raspberry Pi Pico with Headers and Micro USB Cable

Raspberry Pi Pico with Headers and Micro USB Cable

Overview

The Raspberry Pi Pico is a low-cost, high-performance microcontroller board from Raspberry Pi, featuring a dual-core Arm Cortex-M0+ processor, 264KB of SRAM, and 2MB of flash memory. The board comes with headers and a micro USB cable, making it an ideal choice for IoT projects, robotics, and prototyping.

Technical Specifications

Microcontroller: RP2040 (Dual-core Arm Cortex-M0+)
 Processor Speed: Up to 133 MHz
 RAM: 264KB
 Flash Memory: 2MB
 Operating Temperature: -20C to 85C
 Dimensions: 51mm x 21mm
 Headers: 40-pin GPIO header, 3-pin debug header
 USB: Micro USB B

Programming Languages

The Raspberry Pi Pico can be programmed using C, C++, and MicroPython.

Code Examples

### Example 1: Blinking an LED using C

This example demonstrates how to use the Raspberry Pi Pico to blink an LED connected to GPIO 25.

Hardware Requirements

Raspberry Pi Pico with headers
 LED
 1k resistor
 Breadboard
 Jumper wires

Code
```c
#include <stdio.h>
#include "pico/stdlib.h"

#define LED_PIN 25

int main() {
    stdio_init_all();
    gpio_init(LED_PIN);
    gpio_set_dir(LED_PIN, GPIO_OUT);

while (true) {
        gpio_put(LED_PIN, 1);
        sleep_ms(500);
        gpio_put(LED_PIN, 0);
        sleep_ms(500);
    }
    return 0;
}
```
Compile and Run

1. Open a terminal and navigate to the directory where you saved the code.
2. Compile the code using `gcc`: `gcc -o blink blink.c -ludev -lstdc++`
3. Run the program: `./blink`

### Example 2: Reading Temperature and Humidity using MicroPython

This example demonstrates how to use the Raspberry Pi Pico to read temperature and humidity values from a DHT11 sensor using MicroPython.

Hardware Requirements

Raspberry Pi Pico with headers
 DHT11 temperature and humidity sensor
 Breadboard
 Jumper wires

Code
```python
import machine
import dht

# Initialize the DHT11 sensor on GPIO 22
d = dht.DHT11(machine.Pin(22))

while True:
    # Read temperature and humidity values
    temp = d.temperature()
    humid = d.humidity()
    
    # Print the values
    print(f'Temperature: {temp}C, Humidity: {humid}%')
    
    # Wait for 1 second before taking the next reading
    machine.sleep(1000)
```
Run

1. Open a terminal and navigate to the directory where you saved the code.
2. Run the program using MicroPython: `python dht_example.py`

Note: Make sure to install the necessary libraries and drivers for the DHT11 sensor before running the code.

### Example 3: USB Communication using Python (Optional)

This example demonstrates how to use the Raspberry Pi Pico as a USB device, communicating with a Python script on a host computer.

Hardware Requirements

Raspberry Pi Pico with headers
 Micro USB cable
 Host computer with Python installed

Pico Code (usb_example.py)
```python
import usb

# Initialize the USB device
usb.init()

while True:
    # Wait for a USB connection
    if usb.connected():
        # Read data from the host computer
        data = usb.recv(64)
        
        # Print the received data
        print(data.decode())
        
        # Send a response back to the host computer
        usb.send(b'Hello from Pico!')
```
Host Computer Code (usb_host.py)
```python
import pyusb

# Open the USB device
dev = pyusb Device(0x0004, 0x00A2, 0x00)  # Replace with your Pico's USB ID

while True:
    # Send a message to the Pico
    dev.write(b'Hello Pico!')
    
    # Read the response from the Pico
    response = dev.read(64)
    
    print(response.decode())
```
Run

1. Run the Pico code using `python usb_example.py` on the Raspberry Pi Pico.
2. Run the host computer code using `python usb_host.py` on the host computer.

Note: This example requires additional setup and configuration for USB communication. Refer to the Raspberry Pi Pico documentation for more information.