• Build a NTP server with GPS/PPS
• How to Control Blue Status LED
• ODROID-C4 with mini DC UPS
• ODROID-C4 Alternative power input
• ODROID-C4 with mini DC UPS
• S/PDIF
• DIY WiFI Shield

If you want to remap the blue heartbeat LED to other GPIO, refer this great instruction.

Alternative Heartbeat LED

• Dallas 1-Wire Support
• Enhancement of 40pin GPIO
• GPIO Status Check Program
• ODROID-C4 I2C Controller(Device Node) Information
• Hardware GPIO-IRQ
• Memory Mapped GPIO
• Hardware PWM
• SPI
• WiringPi and Python Wrapper
• Power Off and Wake Up using GPIO Key Button
• Android application launching with a GPIO trigger
• CAN BUS
• Android Things with I2C 20x4 LCD
• Android Things with LED
• Android Things with PWM
• Android Things with weather2-board
• Android Things with Uart Callback
• Android Things with SPI MCP2515
• Android Things with SPI Loopback
• UART
• ADC
• IR
• How to Enable SPI/I2C/UART Using DTBO
• Way to use keypad matrix

• How to set cpu frequency and cores
• TFTP Netbooting
• How to set display resolution and modes
• Get weather infomation with Weather-Board2
• Support Custom Remote Controller with LIRC (IR RX)
• Support GPIO based IR Blaster (IR TX)
• Wake-On-Lan
• Wake Up using IR Remote Controller
• Tips for Custom Boot Logo
• Linux kernel support DRM and Wayland (WIP)
• How to turn off your monitor
• How to add more SPI slave devices with SS and IRQ
• Watchdog on Linux/Ubuntu
• Device Tree Overlay
• How to change Video capture codec for camera on the Android?
• HDMI Overscan

• How to check board identity
• How to activate dmesg on display