diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..91b5ecb
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+# gem "sinatra"
+gem 'rpi_gpio'
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..bd4d528
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    rpi_gpio (0.3.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rpi_gpio
+
+BUNDLED WITH
+   2.0.1
diff --git a/main.rb b/main.rb
new file mode 100755
index 0000000..512fc1b
--- /dev/null
+++ b/main.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+#!/usr/bin/env ruby
+
+require 'bundler'
+require 'rpi_gpio'
+
+Bundler.setup
+Bundler.require
+
+
+BLUE = 37
+WHITE = 35
+RED = 33
+GREEN = 31
+YELLOW = 29
+leds = [BLUE, WHITE, RED, GREEN, YELLOW]
+
+
+io = RPi::GPIO
+io.set_numbering :board
+
+leds.each do |led|
+  io.setup led, as: :output, initialize: :low
+  io.set_low led
+end
+
+10.times do
+  5.times do |i|
+   sleep 0.5
+   io.set_high leds[i]
+   io.set_low leds[i - 1]
+  end
+end
+io.reset