In this video — part 3 of the Kitflix Arduino UNO R4 & IoT course series — we get hands-on for the first time. We write our first sketch, set up the Arduino IDE, install the UNO R4 board definitions, and blink the onboard LED with different delays. We also cover an important hardware limitation of the R4 pins that most beginner tutorials skip.
🔧 What we cover: - Arduino sketch structure — void setup() vs void loop() - pinMode() — setting a pin as digital output - digitalWrite() HIGH and LOW — generating 5V or 0V on a pin - delay() — controlling timing in milliseconds - Naming pins with variables instead of hardcoding numbers - Downloading and installing Arduino IDE from arduino.cc - Installing Arduino UNO R4 board definitions in Board Manager - Connecting the board via USB-C and selecting the correct port - Uploading your first sketch — and fixing a real case sensitivity bug live - Experimenting with different blink delays: 1500ms, 500ms, 200ms, 2000ms - Important: R4 pin current limit is 8mA — what that means for your projects
⏱️ Chapters: 00:00 Intro — digital output on Arduino UNO R4 00:21 Pins available for digital output (D0–D13, A0–A5) 00:38 Arduino sketch structure — setup() and loop() 01:15 pinMode() — declaring a pin as output 01:36 digitalWrite() HIGH and LOW 02:35 delay() explained 02:51 Downloading Arduino IDE 03:17 IDE walkthrough — menus, sidebar, board manager 04:27 Writing the blink sketch 05:08 Installing Arduino UNO R4 board definitions 05:57 Connecting the board via USB-C 06:18 Selecting board and port in IDE 06:44 Uploading — and fixing a case sensitivity bug live 07:15 LED blinking at 1500ms 07:21 Changing delay to 500ms 07:50 Changing to 200ms 08:07 Changing to 2000ms 08:42 R4 pin current limit — 8mA vs R3's 40mA 09:22 What's next
