hasumikin

#!/usr/bin/env ruby

require 'fileutils'

DEFAULT_DEVICE = '/dev/ttyUSB0'
DEFAULT_BAUDRATE = '115200'

if ARGV.include?('--help') || ARGV.include?('-h')
  puts <<~HELP
    This script connects to a serial device using 'screen' and automatically

hasumikin

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PicoRuby Workshop 2025 - Internet of Things

Previous sections:

1. Setup + LED: https://tinyurl.com/picoruby-2025
2. Microphone: https://tinyurl.com/picoruby-mic
3. Buzzer: https://tinyurl.com/picoruby-buzzer
4. Useful gems: https://tinyurl.com/picoruby-gems

hasumikin

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PicoRuby Workshop 2025 - Useful Gems

Previous sections:

1. Setup + LED: https://tinyurl.com/picoruby-2025
2. Microphone: https://tinyurl.com/picoruby-mic
3. Buzzer: https://tinyurl.com/picoruby-buzzer

So far we've learned the fundamental peripherals: GPIO, ADC, and PWM. These are the building blocks of all microcontroller programming. Now let's explore how PicoRuby's gem system makes working with complex sensors much easier!

hasumikin

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PicoRuby Workshop 2025 - Buzzer & PWM

Previous sections:

1. Setup + LED: https://tinyurl.com/picoruby-2025
2. Microphone: https://tinyurl.com/picoruby-mic

In this section, we'll learn about PWM (Pulse Width Modulation) - a powerful technique that allows us to simulate analog signals using digital outputs. We'll use PWM to create sounds with a buzzer and control LED brightness smoothly.

hasumikin

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PicoRuby Workshop 2025 - Microphone & ADC

Previous sections:

1. Setup + LED: https://tinyurl.com/picoruby-2025

In this section, we'll learn about analog-to-digital conversion (ADC) and explore how to read analog sensors. We'll use a microphone to detect sound levels and also explore the RP2350's built-in temperature sensor.

hasumikin

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PicoRuby Workshop 2025 - Setup & LED Control

Before starting, please check the following resources:

• Terminal emulator (Many of you have already read): https://picoruby.github.io/terminal-emulator
• Setup R2P2: https://picoruby.github.io/setup
  • In this workshop, we use R2P2-PICORUBY-PICO2_W-*.uf2 (PICO2_W is the point)
• Breadboard basics: https://picoruby.github.io/breadboard-basics

hasumikin

Setup, general information and trouble shooting

Important Notes

(Also read Trouble Shoot)

Laptop Security Settings

If your laptop is configured to prohibit writing to USB memory devices, likely due to your company's security policy, it will not function in the workshop😣

hasumikin

require "adc"
require "mouse"

kbd = Keyboard.new

kbd.init_direct_pins( [8] )

kbd.add_layer :default, %i(BOOTSEL)

kbd.define_mode_key :BOOTSEL, [ Proc.new { kbd.bootsel! }, nil, 300, nil ]

hasumikin

require "spi"
require "mouse"
require "consumer_key"

class SPI
  def pmw3360dm_write(*values)
    GPIO.write_at(21, 0)
    write(*values)
    Machine.delay_us 20
    GPIO.write_at(21, 1)

hasumikin

#
# Pin assignment:
# switch matrix:
#   row: 1, 2, 3, 4
#   col: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
# RGBLED: 0
# I2C0: trackball and RTC
#   sda_pin: 20
#   scl_pin: 21
# SPI1: