The Serial TTL Connector We Deserve | Hacker News

Hacker News discussed using 3.5mm TRS headphone-style jacks as a practical TTL serial connector for embedded devices.

Supporters said the connector is cheap, widely available, and makes serial console access easier for debugging and development.

The debate focused on tradeoffs such as hot-plug safety, resistor and ESD protection, and adding a voltage-reference pin for compatibility.

Some commenters argued that USB-C or other standardized connector schemes may offer better long-term robustness and usability.