Godot + Arduino series: companion project code
Self-contained project code for the "Godot Isn't Just for Games" series: Arduino sketches, the Python serial<->UDP bridge, and the Godot 4 projects, one folder per article.
This commit is contained in:
tyler parker
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extends Control
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# Part 1 — the minimal round trip: a Godot button that toggles an LED on the
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# Arduino. Only the OUTBOUND (command) half of the link is used here; Part 2
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# adds inbound telemetry from the joystick.
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const COMMAND_ADDR := "127.0.0.1"
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const COMMAND_PORT := 4243
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@onready var led_button: Button = $Panel/LedButton
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var _udp_out := PacketPeerUDP.new()
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var _led_on := false
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func _ready() -> void:
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# To SEND with PacketPeerUDP in Godot 4, use set_dest_address — NOT
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# connect_to_host, which is for receiving and silently drops outbound packets.
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_udp_out.set_dest_address(COMMAND_ADDR, COMMAND_PORT)
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led_button.pressed.connect(_on_led_pressed)
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func _on_led_pressed() -> void:
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_led_on = not _led_on
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_udp_out.put_packet(("L1" if _led_on else "L0").to_utf8_buffer())
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led_button.text = "LED: ON" if _led_on else "LED: OFF"
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@@ -0,0 +1 @@
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uid://ctgyyk0it7dpd
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@@ -0,0 +1,91 @@
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[gd_scene load_steps=6 format=3]
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[ext_resource type="Script" path="res://LedBasics.gd" id="1_led"]
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[sub_resource type="StyleBoxFlat" id="bg"]
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bg_color = Color(0.043, 0.055, 0.078, 1)
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[sub_resource type="StyleBoxFlat" id="btn_normal"]
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bg_color = Color(0.11, 0.145, 0.204, 1)
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border_width_left = 1
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border_width_top = 1
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border_width_right = 1
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border_width_bottom = 1
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border_color = Color(0.2, 0.6, 1, 0.5)
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corner_radius_top_left = 8
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corner_radius_top_right = 8
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corner_radius_bottom_right = 8
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corner_radius_bottom_left = 8
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[sub_resource type="StyleBoxFlat" id="btn_hover"]
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bg_color = Color(0.145, 0.196, 0.278, 1)
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border_width_left = 1
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border_width_top = 1
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border_width_right = 1
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border_width_bottom = 1
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border_color = Color(0.3, 0.7, 1, 1)
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corner_radius_top_left = 8
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corner_radius_top_right = 8
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corner_radius_bottom_right = 8
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corner_radius_bottom_left = 8
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[sub_resource type="StyleBoxFlat" id="btn_pressed"]
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bg_color = Color(0.2, 0.6, 1, 1)
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corner_radius_top_left = 8
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corner_radius_top_right = 8
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corner_radius_bottom_right = 8
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corner_radius_bottom_left = 8
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[node name="Main" type="Control"]
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layout_mode = 3
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anchors_preset = 15
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anchor_right = 1.0
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anchor_bottom = 1.0
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script = ExtResource("1_led")
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[node name="Panel" type="Panel" parent="."]
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layout_mode = 1
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anchors_preset = 15
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anchor_right = 1.0
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anchor_bottom = 1.0
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theme_override_styles/panel = SubResource("bg")
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[node name="Title" type="Label" parent="Panel"]
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layout_mode = 0
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offset_left = 40.0
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offset_top = 96.0
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offset_right = 480.0
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offset_bottom = 130.0
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theme_override_colors/font_color = Color(0.85, 0.93, 1, 1)
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theme_override_font_sizes/font_size = 24
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text = "GODOT + ARDUINO: LED"
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horizontal_alignment = 1
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vertical_alignment = 1
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[node name="Subtitle" type="Label" parent="Panel"]
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layout_mode = 0
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offset_left = 40.0
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offset_top = 132.0
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offset_right = 480.0
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offset_bottom = 152.0
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theme_override_colors/font_color = Color(0.4, 0.55, 0.7, 1)
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theme_override_font_sizes/font_size = 12
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text = "· click to reach down the wire ·"
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horizontal_alignment = 1
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vertical_alignment = 1
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[node name="LedButton" type="Button" parent="Panel"]
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layout_mode = 0
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offset_left = 150.0
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offset_top = 220.0
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offset_right = 370.0
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offset_bottom = 284.0
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theme_override_colors/font_color = Color(0.85, 0.93, 1, 1)
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theme_override_colors/font_hover_color = Color(1, 1, 1, 1)
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theme_override_colors/font_pressed_color = Color(0.043, 0.055, 0.078, 1)
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theme_override_font_sizes/font_size = 18
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theme_override_styles/normal = SubResource("btn_normal")
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theme_override_styles/hover = SubResource("btn_hover")
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theme_override_styles/pressed = SubResource("btn_pressed")
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theme_override_styles/focus = SubResource("btn_normal")
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text = "LED: OFF"
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extends Control
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const TELEMETRY_PORT := 4242
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const COMMAND_ADDR := "127.0.0.1"
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const COMMAND_PORT := 4243
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const ADC_MAX := 1023.0
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const SMOOTH_SPEED := 12.0 # higher = snappier, lower = floatier
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@onready var led_button: Button = $Panel/LedButton
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@onready var pad: Panel = $Panel/Pad
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@onready var dot: ColorRect = $Panel/Pad/Dot
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var _udp_in := PacketPeerUDP.new()
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var _udp_out := PacketPeerUDP.new()
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var _target_x := 512.0 # rest near center so the dot starts in the middle
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var _target_y := 512.0
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var _smoothed_x := 512.0
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var _smoothed_y := 512.0
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var _btn_pressed := false
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var _led_on := false
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const COLOR_DOT_IDLE := Color(0.3, 0.7, 1.0) # cyan
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const COLOR_DOT_PRESSED := Color(0.2, 1.0, 0.4) # green
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func _ready() -> void:
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_udp_in.bind(TELEMETRY_PORT, "127.0.0.1")
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# set_dest_address is the reliable way to *send* with PacketPeerUDP in Godot 4;
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# connect_to_host is aimed at receiving and can silently drop outbound packets.
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_udp_out.set_dest_address(COMMAND_ADDR, COMMAND_PORT)
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led_button.pressed.connect(_on_led_pressed)
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func _process(delta: float) -> void:
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# Drain the queue; the newest packet wins. Format: "x,y,btn" e.g. "512,498,0"
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while _udp_in.get_available_packet_count() > 0:
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var parts := _udp_in.get_packet().get_string_from_utf8().split(",")
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if parts.size() >= 3 and parts[0].is_valid_int() and parts[1].is_valid_int():
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_target_x = float(parts[0])
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_target_y = float(parts[1])
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_btn_pressed = parts[2].strip_edges() == "1"
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# Frame-rate-independent smoothing so the dot glides instead of twitching.
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var t := 1.0 - exp(-SMOOTH_SPEED * delta)
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_smoothed_x = lerpf(_smoothed_x, _target_x, t)
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_smoothed_y = lerpf(_smoothed_y, _target_y, t)
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# Normalize raw ADC (0..1023) to 0..1.
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var nx := clampf(_smoothed_x / ADC_MAX, 0.0, 1.0)
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var ny := clampf(_smoothed_y / ADC_MAX, 0.0, 1.0)
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# Move the dot within the pad. Invert Y so pushing the stick UP moves the dot UP.
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# (If it feels backwards, change "1.0 - ny" to "ny", or swap for X below.)
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var travel := pad.size - dot.size
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dot.position = Vector2(nx * travel.x, (1.0 - ny) * travel.y)
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# Reflect the stick's push-button by recoloring the dot.
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dot.color = COLOR_DOT_PRESSED if _btn_pressed else COLOR_DOT_IDLE
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func _on_led_pressed() -> void:
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_led_on = not _led_on
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_udp_out.put_packet(("L1" if _led_on else "L0").to_utf8_buffer())
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led_button.text = "LED: ON" if _led_on else "LED: OFF"
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@@ -0,0 +1 @@
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uid://d103i6ghi3ydl
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[gd_scene format=3 uid="uid://b81ornfxnvxxo"]
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[ext_resource type="Script" uid="uid://d103i6ghi3ydl" path="res://Main.gd" id="1_main"]
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[sub_resource type="StyleBoxFlat" id="bg"]
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bg_color = Color(0.043, 0.055, 0.078, 1)
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[sub_resource type="StyleBoxFlat" id="pad"]
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bg_color = Color(0.071, 0.09, 0.125, 1)
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border_width_left = 1
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border_width_top = 1
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border_width_right = 1
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border_width_bottom = 1
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border_color = Color(0.2, 0.6, 1, 0.55)
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corner_radius_top_left = 10
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corner_radius_top_right = 10
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corner_radius_bottom_right = 10
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corner_radius_bottom_left = 10
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shadow_color = Color(0.2, 0.6, 1, 0.15)
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shadow_size = 12
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[sub_resource type="StyleBoxFlat" id="btn_normal"]
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bg_color = Color(0.11, 0.145, 0.204, 1)
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border_width_left = 1
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border_width_top = 1
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border_width_right = 1
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border_width_bottom = 1
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border_color = Color(0.2, 0.6, 1, 0.5)
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corner_radius_top_left = 8
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corner_radius_top_right = 8
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corner_radius_bottom_right = 8
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corner_radius_bottom_left = 8
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[sub_resource type="StyleBoxFlat" id="btn_pressed"]
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bg_color = Color(0.2, 0.6, 1, 1)
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corner_radius_top_left = 8
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corner_radius_top_right = 8
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corner_radius_bottom_right = 8
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corner_radius_bottom_left = 8
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[sub_resource type="StyleBoxFlat" id="btn_hover"]
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bg_color = Color(0.145, 0.196, 0.278, 1)
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border_width_left = 1
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border_width_top = 1
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border_width_right = 1
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border_width_bottom = 1
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border_color = Color(0.3, 0.7, 1, 1)
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corner_radius_top_left = 8
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corner_radius_top_right = 8
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corner_radius_bottom_right = 8
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corner_radius_bottom_left = 8
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[node name="Main" type="Control" unique_id=2088197079]
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layout_mode = 3
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anchors_preset = 15
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anchor_right = 1.0
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anchor_bottom = 1.0
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grow_horizontal = 2
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grow_vertical = 2
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script = ExtResource("1_main")
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[node name="Panel" type="Panel" parent="." unique_id=2059422118]
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layout_mode = 1
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anchors_preset = 15
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anchor_right = 1.0
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anchor_bottom = 1.0
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grow_horizontal = 2
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grow_vertical = 2
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theme_override_styles/panel = SubResource("bg")
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[node name="Title" type="Label" parent="Panel" unique_id=1798584764]
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layout_mode = 0
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offset_left = 40.0
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offset_top = 28.0
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offset_right = 480.0
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offset_bottom = 58.0
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theme_override_colors/font_color = Color(0.85, 0.93, 1, 1)
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theme_override_font_sizes/font_size = 22
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text = "GODOT + ARDUINO DEMO"
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horizontal_alignment = 1
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vertical_alignment = 1
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[node name="Subtitle" type="Label" parent="Panel" unique_id=462472763]
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layout_mode = 0
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offset_left = 40.0
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offset_top = 60.0
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offset_right = 480.0
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offset_bottom = 78.0
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theme_override_colors/font_color = Color(0.4, 0.55, 0.7, 1)
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theme_override_font_sizes/font_size = 12
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text = "· real-time serial link ·"
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horizontal_alignment = 1
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vertical_alignment = 1
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[node name="Pad" type="Panel" parent="Panel" unique_id=1034082861]
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layout_mode = 0
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offset_left = 70.0
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offset_top = 104.0
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offset_right = 450.0
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offset_bottom = 484.0
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theme_override_styles/panel = SubResource("pad")
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[node name="CrosshairV" type="ColorRect" parent="Panel/Pad" unique_id=1237114789]
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layout_mode = 0
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offset_left = 189.0
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offset_right = 191.0
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offset_bottom = 380.0
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color = Color(0.2, 0.6, 1, 0.12)
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[node name="CrosshairH" type="ColorRect" parent="Panel/Pad" unique_id=1265685762]
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layout_mode = 0
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offset_top = 189.0
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offset_right = 380.0
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offset_bottom = 191.0
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color = Color(0.2, 0.6, 1, 0.12)
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[node name="Dot" type="ColorRect" parent="Panel/Pad" unique_id=2003621157]
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layout_mode = 0
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offset_right = 28.0
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offset_bottom = 28.0
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color = Color(0.3, 0.7, 1, 1)
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[node name="LedButton" type="Button" parent="Panel" unique_id=1325564653]
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layout_mode = 0
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offset_left = 160.0
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offset_top = 516.0
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offset_right = 360.0
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offset_bottom = 566.0
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theme_override_colors/font_color = Color(0.85, 0.93, 1, 1)
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theme_override_colors/font_pressed_color = Color(0.043, 0.055, 0.078, 1)
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theme_override_colors/font_hover_color = Color(1, 1, 1, 1)
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theme_override_font_sizes/font_size = 18
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theme_override_styles/normal = SubResource("btn_normal")
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theme_override_styles/pressed = SubResource("btn_pressed")
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theme_override_styles/hover = SubResource("btn_hover")
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theme_override_styles/focus = SubResource("btn_normal")
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text = "LED: OFF"
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@@ -0,0 +1,24 @@
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; Engine configuration file.
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; It's best edited using the editor UI and not directly,
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; since the parameters that go here are not all obvious.
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;
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; Format:
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; [section] ; section goes between []
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; param=value ; assign values to parameters
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config_version=5
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[application]
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config/name="ArduinoGodot"
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run/main_scene="res://Main.tscn"
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config/features=PackedStringArray("4.7")
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[display]
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window/size/viewport_width=520
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window/size/viewport_height=610
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[dotnet]
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project/assembly_name="ArduinoGodot"
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Block a user