Lidar TFMini Plus connection via I2C

[d.dogalakov]

Good day!

I have problem to connection 2 lidars (TFMini Plus) to Jetson Nano via “I2C”…
I used the library, link: GitHub - budryerson/TFMini-Plus-I2C_python: Python module fot TFMini-Plus in I2C communication mode.
I’m using 1 lidar via this library, no problem… well
but I don’t know how to connect second lidar…
After initialization of second lidar, I can’t get data from first lidar.

Has anyone solved this problem?
Can you help me to solver this task… any tips.

Have a nice day!

Best regards,
Darkhan.

[ShaneCCC]

Did you connect to the same I2C bus?
Did you check if any configure for I2C bus configure and slave address configure?

[d.dogalakov]

Thank you for your fast reply …
I used the different ports and addresses to lidars…

import time
import sys
import tfmpi2c as tfmP0 # Import tfmpi2c module v0.0.7
import tfmpi2c as tfmP1 # Import tfmpi2c module v0.0.7

I2CPort = 0 # I2C(0), pins 27/28
I2CAddr = 0x11 # Device address in Hex 11 = Decimal 17
b0 = tfmP0;
print("I2C mode Bus(0): ", end=‘’)
if (b0.begin(I2CPort, I2CAddr)):
print(“ready Bus(0)”)
else:
print(“not ready Bus(0)”)
# sys.exit() # quit the program if I2C bus not ready
time.sleep(0.5)

I2CPort = 1 # I2C(0), pins 3/5
I2CAddr = 0x10 # Device address in Hex 10 = Decimal 16
b1 = tfmP1;
print("I2C mode Bus(1): ", end=‘’)
if (b1.begin(I2CPort, I2CAddr)):
print(“ready Bus(1)”)
else:
print(“not ready Bus(1)”)
# sys.exit() # quit the program if I2C bus not ready
time.sleep(0.5)

… after initialization, runing and getting data from Bus(0) and Bus(1) I have:

data (value = ‘dist’) in debugger shows Bus(0) = Bus(1), same value of ‘dist’,
although the lidars are directed in different directions.

---

Best regards,
Darkhan.

[ShaneCCC]

I would suggest using i2cget utility to check if able get the data from both devices and then break down the python code to figure the root cause.

Thanks

[d.dogalakov]

I’m getting:

may be I have to send a command to TFMini Plus that it start to send data…

Thank you!

[ShaneCCC]

If there’s no any error message in dmesg that tell the i2c communicate to the device without problem. You may need to trace the python code to figure out the problem.

[d.dogalakov]

I will try to divide the code (tasks) to 2 threads.
then I reply here…

Thank you!

[kayccc]

Is this still an issue to support? Any result can be shared? Thanks

[d.dogalakov]

Hello!

Yes, I will answer next week, just now I put off this task.

Thanks!