https://electwork.net/en/tags/arduino-uno-r4/ Recent content in Arduino UNO R4 on Electronics Lifehack! https://electwork.net/images/ogp-default.jpg?v=3 https://electwork.net/images/ogp-default.jpg?v=3 Hugo -- gohugo.io en Wed, 11 Feb 2026 00:00:00 +0900 https://electwork.net/en/posts/arduino-74hc595-led-board/ Wed, 11 Feb 2026 00:00:00 +0900 https://electwork.net/en/posts/arduino-74hc595-led-board/ Using the 74HC595 shift register with Arduino, for beginners: pin wiring (SER/SRCLK/RCLK), shiftOut() sample code, and cascading for unlimited expansion. Includes schematics, KiCad data, and hardware SPI. https://electwork.net/en/posts/arduino-software-pwm-wave/ Thu, 22 Jan 2026 00:00:00 +0900 https://electwork.net/en/posts/arduino-software-pwm-wave/ Implementing Software PWM on the Arduino UNO R4: give every digital pin — not just the six hardware PWM pins — smooth brightness control. Covers gamma correction, wave phase math, and flicker-free 3.9 kHz PWM. https://electwork.net/en/posts/arduino-buzzer-sound/ Sat, 27 Jun 2020 00:00:00 +0900 https://electwork.net/en/posts/arduino-buzzer-sound/ Build an electronic piano with Arduino and a passive piezo buzzer using tone(). How tone()/noTone() work, a three-octave note-to-frequency table, circuit wiring, sample code, and an auto-play melody demo.