EV3 IR, ultrasonic senosor documentation

[Tigran]

Hi guys,

I want to connect EV3 IR and ultrasonic sensors to my Arduino. Unfortunately I could not find any good documents describing how to use/control these sensors.

Till now the link below is the best site I found.

http://ev3.fantastic.computer/doxygen/UartDriver.html

Unfortunately it is not enough to understand the synchronization between sensors and the Host.

This is the description how it should be done:

- Enable UART communication

- Setup UART for LOWEST_BITRATE

- Setup hardware buffers

- Sync clocks

- Wait for receive of byte <-.

- If CMD is received skip to send INFO |

- Check byte against SYNC |

- If not SYNC increase UART clock --'

- Send sync feedback

- Exchange informations

- Receive command data

- Send command data (type,modes,speed, etc)

- Receive info data

- Send info data (name,scaling,data format, etc)

- Receive acknowledge

- When finished info send acknowledge

- Switch to valid communication speed

How can I know that the received byte is command or sync byte. It can be the payload byte with the same value as for command and sync.

Any comments please?

I already spent a loot of time trying to find useful information.

Thank you very much.

[goggel]

The best thing to do is probably look into how it's been done by ev3dev and others. http://www.ev3dev.org/docs/sensors/#supported-sensors seems to be a good start point for further details.

Edited July 15, 2015 by goggel

[lee82gx]

I have downloaded the source codes from below and one or two of the packages do detail what you are looking for:

http://www.lego.com/en-us/mindstorms/downloads