Setup

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The link below will get you up to speed in installing and setting up micripython on the pico

Installing Micropython

Pinout

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1. Dual-Core ARM Cortex-M0+
2. Clock speed 48MHz, Boost to 133MHz
3. 8 ground pins
4. 26 GPIOs
5. Internal for LED
6. 12-bit ADC
7. 3 ADCs, Internal ADC for temperature
8. 2 I2C buses
9. 2 SPI buses
10. 2 UART Buses
11. 16 PWM channels

Powering

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1. Can operate as normal MCU
2. Can be powered using micro-USB
3. Battery powering

Programming

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Pico can be programmed using Micropython or C++. The link below has additional information. Set up Thonny IDE to use with the Raspberry Pi Pico

Pico uses 3.3V logic and it has 26 GPIO pins with PWM. It has also internal pull up resistors to reduce the circuitry needed.

1. Blink

import machine
import utime

led_pin = machine.Pin(10, machine.Pin.OUT)

while True:
    led_pin.value(1)
    utime.sleep_ms(500)
    led_pin.value(0)
    utime.sleep(500)

2. Push button without debounce

import machine
import utime

btn = machine.Pin(11, machine.Pin.IN, machine.Pin.PULL_DOWN)
# pull down to hold the button low all the time unless when it is pressed

while True:
    if btn.value() == 1:
        print("pressed")
        
    utime.sleep_ms(300)

More examples

1. Led toggle
2. I2C
3. Reading voltage with potentiometer
4. PWM
5. Controlling LED brightness with PWM and potentiometer
6. Push button without debounce
7. LED blink