Lidar-Lite Help Please

[slibert]

Originally Posted by Bpk9p4

any chance you could post a wiring diagram of how you had it wired?

Lidar Lite Pinout is on page 8 of this datasheet: http://www.robotshop.com/media/files...32i500s011.pdf

RoboRio onboard I2C pinout is displayed on the silkscreen of the robot itself.

Simply connect RoboRio -> Lidar Lite:

GND -> Signal/Power Ground
3.3V -> POWER_IN
SCL -> I2C Clock (SCL)
SDA -> I2C Data (SDA)

My V1 sensor worked fine w/the 3.3V power pin from the RoboRIO onboard I2C connector - but you could provide it 5V power instead from one of the 5V RoboRio power rails (or the VRM) and that should work too.

[Bpk9p4]

thanks. Some people were saying you need a pull up resist to get it to work. Sounds like you got it to work without one?

[RyanN]

Originally Posted by Bpk9p4

thanks. Some people were saying you need a pull up resist to get it to work. Sounds like you got it to work without one?

The roboRIO has 2.2k pull-up resistors on the I2C pins as mentioned on page 15 of the User Manual.

[khannasusa]

Hi All

Thanks for all your posts and replies. Here is the final update from our experiments -

we looked at the example from Marvin T MARS Team 2614. Thanks "sraque".

There are Lidar Open and read VIs and they work as-is. Also we have our Lidar connected to I2C on NavX via MXP ports on roborio

I have attached 2 images for open and read snippets from our Begin.vi and Lidar controller VIs.

--sk

[Bpk9p4]

Looks like you forgot to post the begin. Could you post it

[sraque]

Originally Posted by khannasusa

Hi All

Thanks for all your posts and replies. Here is the final update from our experiments -

we looked at the example from Marvin T MARS Team 2614. Thanks "sraque".

There are Lidar Open and read VIs and they work as-is. Also we have our Lidar connected to I2C on NavX via MXP ports on roborio

I have attached 2 images for open and read snippets from our Begin.vi and Lidar controller VIs.

--sk

You are welcome. I could not figure out from your post if it is now working or not. If not, connect to the main roborio i2c port, not MXP. From last year, there were issues with the MXP i2c port. They may have been fixed this year, but I do not know.

[Bpk9p4]

I have tried both of your code and i keep getting the same error saying

<b>Complete call chain:</b>
i2clib_writeread.vi
WPI_I2CRead.vi
Lidar Read.vi
Simple Digital Output.vi
ERROR -1 i2clib_write.vi<ERR>
Device or resource busy


<b>Complete call chain:</b>
i2clib_write.vi
WPI_I2CWrite.vi
Lidar Read.vi
Simple Digital Output.vi
ERROR -1 i2clib_writeread.vi<ERR>
Device or resource busy

Has anyone seen this error before. Bellow is my code and a picture of the error log

Error log: http://imgur.com/II5VMzV
main code: http://imgur.com/CKZ7Dzk
open code: http://imgur.com/CKZ7Dzk
read code: http://imgur.com/UD1j4qk

wiring
Power: 3.3 on-board from the i2c port
Ground: on-board from the i2c port
SDA: on-board from the i2c port
SCL: on-board from the i2c port

[Richard100]

Need to see your Open code. The links for Open and Main both show main code.

Is you roboRIO I2C power jumper set to 3.3 V for the On-Board I2C interface?

[Bpk9p4]

sorry about that one. I will get that posted once i am home from work. Yes the I2C is set to 3.3v

I have hooked it up to 5v (from the DIO 5v pin) and i get the same results

[khannasusa]

Looks like I forgot to attach the open VI.
Here it is. These 2 Vis are working via I2C on MXP.

[sraque]

Originally Posted by Bpk9p4

sorry about that one. I will get that posted once i am home from work. Yes the I2C is set to 3.3v

I have hooked it up to 5v (from the DIO 5v pin) and i get the same results

Hmm..not sure what it could be. I think we wired the same as you are. We wired to the main I2C port on the RIO except for power which we wired to a 5V pin on DIO. We didn't add pull-up resistors or the capacitor that is shown on Lidar-Lite Website Arduino wiring example.

I see your code has the same loop time delays as ours...try putting the I2C Enum VI in your Begin temporarily to see if you can see the Lidar at all.

Another thing I have done to convince myself that the Lidar is working is to connect it to an Arduino, if you have one, and use the software from the Lidar Lite website to see the data.