This has the benefit of fewer wires but does result in a bit of communication overhead for each transmitted “packet” or data frame. Unlike other popular serial communication protocols like I 2C and SPI, TTL serial is asynchronous, which means it does not rely on a shared clock signal (precisely timed voltage pulses) paired with its data lines. In this lesson, we will focus on asynchronous serial communication, specifically TTL serial (Transistor-Transistor Logic Serial)-an enduring standard that has prevailed since the beginning of personal computers and is what the Arduino Serial library uses. And beyond! Many different protocols have been created to support device-to-device communication from Ethernet and Zigbee to WiFi and Bluetooth.
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