miyako_temp.rb

#encoding: utf-8
require 'miyako'
include Miyako
require "wincom"
require 'miyako_temp_lib'

# 初期化ここから
comp1 = Serial.new
comp1.open(5,0x0000,9600,8,0,0,256,256)
comp1.send("AT\r\n")
string_stored = ""
temp = 0
font = Font.sans_serif
# 初期化ここまで

Miyako.main_loop do
  break if Input.quit_or_escape? # ESC等で終了
  string_stored = update_string_stored(comp1, string_stored) # シリアルポートから読込
  if string_stored =~ /.*\n/ # 末尾が改行なら
    temp = string_stored.chomp!("\r\n").to_f * 5.0 / 1024 * 100 # 温度を更新
    string_stored = "" # 文字列をクリア
  end
  font.size = 60; font.draw_text(Screen, "現在の温度：#{sprintf("%3.1f", temp)}℃", 20, 50) # 温度を文字で描画
  Drawing.rect(Screen, [20, 225, temp * 20, 50], [255, 0, 0], true) # 温度を図形で描画
  draw_frame(font) # 目盛を描画
end

miyako_temp_lib.rb

def update_string_stored(comp1, string_stored)
  string_recieved = comp1.receive
  if string_recieved == nil
    string_stored
  else
    string_stored << string_recieved
  end
end

def draw_frame(font)
  font.size = 30
  for i in 0..30 do
    if i % 5 == 0
      Drawing.line(Screen, [20 + i * 20, 200, 0, 100], [255, 255, 255], true)
      font.draw_text(Screen, i.to_s, 5 + i * 20, 170)
    else
      Drawing.line(Screen, [20 + i * 20, 200, 0, 100], [0, 255, 0], true)
    end
  end
end