Juuuut user from rcgroups made some tests on using digital ESC signal he called Dshot. Currently alpha firmware is available only for KISS ESC.
Here's quadmovr testing dshot:
Quote:... the protocol sends 11-bit throttle value (2048 steps) and a 4-bit CRC to verify its correctness
Quote:the signal is sent individually on each PWM pin. it uses 600k bit rate and takes 26,7µS for one transmission like this a theoretical max loop time of 33khz would bepossible (as there need to be a space between) but im almost sure we will never need that
advantages compared to the most used analog signals like PWM as also oneshot125 or 42 are:
- no signal jitter.. if the FC sends 1375 the ESC will receive 1375
- high resolution (2048steps)
- no oscillator drift (nomore calibrateing ESC's)
- more robust against spikes
- safer as every singnal has a CRC (cyclic redundancy check)
- maybe later some goodies like having the ESC's beep with the buzzer signal or things like that
Here's quadmovr testing dshot:
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