Connectors
Pinout references for the standard connectors — what each pin carries and how to wire it, straight from the official standards.
USB-C (Type-C) Connector
The 24-pin reversible USB connector — power, USB 2.0, SuperSpeed, and configuration.
RJ45 / Ethernet (T568A & T568B)
The 8-pin (8P8C) Ethernet jack — wiring order for T568A and T568B.
Micro-USB (Type-B) Connector
The 5-pin Micro-USB Type-B connector — power, USB 2.0 data, and OTG ID.
HDMI (Type-A) Connector
The 19-pin HDMI Type-A connector — TMDS video pairs, clock, DDC, CEC, and HPD.
microSD Card Connector
The 8-pin microSD interface — SD bus names with their SPI-mode equivalents.
OBD-II (SAE J1962) Connector
The 16-pin car diagnostic port — CAN, K-line, power, and ground.
DB9 / RS-232 (DE-9) Connector
The 9-pin serial connector — RS-232 data and modem-control signals (DTE).
JTAG / SWD (ARM Cortex Debug) Header
The ARM 10-pin Cortex debug header — SWD (2-wire) and full JTAG signals.
3.5mm Audio Jack (TRS / TRRS)
The headphone/headset jack — 3-conductor TRS (stereo) and 4-conductor TRRS (with mic).