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- Hi, everyone. Today were going to review the basics of the SENT Protocol. SENT, or single edge nibble transmission, is an automotive in-vehicle networking protocol used to report low-speed sensor data from a sensor to the engine control unit, or ECU. SENT was developed because the environment in a car was too noisy to transmit high-resolution sensor data vertically on a 5 V bus. In SENT, sensor signals are transmitted as a series of pulses where the transmitted data lies within the width of the pulses. Pulse widths are measured from falling-edge to falling-edge. The SENT physical layer consists of a 5 V signal lined in the ground. A level of less than 0.5 V on the signal line represents a logic-low. While at greater than 4.1 V is a logic-high. Each SENT frame begins with the Synchronization or SYNC pulse that is used to establish the Tick Time. The Tick Time, or abbreviated as TT, is computed as the sync pulse length divided by 56. The data payload contains the actual information