Dshot—Digital ESC Signal

Dshot—Digital ESC Signal
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This article was translated by Daniel. Thank you!

 

What is Dshot?

Felix Niessen from Flyduino is currently developing a new transmission protocol for ESC control. The new protocol is called Dshot and is the first digital transmission system for ESCs in the FPV racing area. The idea for the new protocol were developed in collaboration with borisb (betaflight). Felix is now developing the new protocol for the KISS FC in use with the KISS 24A ESCs. The digital protocol is almost as fast as Multishot V1, but in the case of Dshot it is also to a large extent about the advantages of a digital transmission mode with regard to failure safety and interference tolerance.

 

Advantages against Oneshot

  • a theoretically 33 kHz looptime
  • no signal fluctuations
  • high resolution (2048 steps)
  • ESC calibration is superfluous
  • Signal disturbing voltage peaks are actively detected
  • Secure transmission thanks to CRC checksum

 

How it works

stm_32_kiss_esc stm32_dma_direct_memory_access

 

99% of the ESCs available on the market used a SILABS or ATMEL processor. Not so the KISS 24A RE ESCs. A Cortex STM32F051 processor is installed on these ESCs. The STM32F051 has a DMA (Direct Memory Access) controller. With this controller, the KISS FC sends a digital signal to the DMA controller of the ESC. The communication takes place between two DMA controllers. This requires nearly no further computing power of the actual STM32 processor.

ANZEIGE:

The new digital protocol sends a 16-bit-long data packet in a tact of 26.7 μs. It is composed as follows:

  • 11 Bit—Throttle value with a resolution of 2048 steps
  •   1 Bit—Telemetry request
  •   4 Bit—CRC checksum (checks the correctness of the signal)

Dshot150—Dshot300—Dshot600

Currently, there are 3 levels for the transfer speed, which can be selected in the KISS GUI.

150 = 150,000 bits per second
300 = 300,000 bits per second
600 = 600,000 bits per second

In this table you will find a comparison of the speeds (gas stick to 100%) of different protocols.

kiss_dshot_speed

Source: https://blck.mn/2016/11/dshot-the-new-kid-on-the-block/

 

Dshot mit Betaflight und BLHeli

Also for Betaflight there will probably be the protocol in the near future, because active support is also being given here.
Requirements for Betaflight

  • at least one STM32 F3 or higher (F4 or F7)
  • According to BorisB: OMNIBUS (blackbox disabled), OMNIBUSF4, BLUEJAYF4, REVO

Requirements for BLHeli

  • at least BLHeli_S
  • BusyBee2 (EFM8BB21F16) chip

Requirements for KISS

  • KISS FC flight controller
  • KISS 24A RE ESC with firmware v.1.02 or higher
  • customized KISS GUI (Google Chrome extension)
  • special KISS FC firmware
  • special KISS 24A firmware

 

I hope you liked this article. What do you think of digital transmission?
The next article will deal with how to install Dshot on a KISS FC and KISS 24A RE controllers.
dshot_logo_kiss_flyduino_titelbild_en

Credits

This article was translated by Daniel. Thank you for this! =)

 


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5 Antworten

  1. 8. November 2016

    […] Dshot – Digital ESC Signal […]

  2. 8. November 2016
  3. 17. November 2016

    […] In this article I would like to explain in a few steps how to you could use Dshot on your KISS setup. What exactly Dshot is, Phil has already explained in detail in a post. You can find it here. […]

  4. 20. November 2016

    […] DSHOT – The new kid on the block – blck.mn What is DShot ESC Protocol – Oscar Liang Dshot – Digital ESC Signal […]

  5. 2. Dezember 2016

    […] Dshot—Digital ESC Signal […]

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