search

ouster-lidar / ouster-sdk

Ouster, Inc. sample code
Other
468 stars 438 forks source link

Configure multipurpose_io pin as output #175

Closed apabu closed 3 years ago

apabu commented 4 years ago

Hi, I'm new to ROS and it will be great if someone could help me out with this. I am trying to configure the multipurpose_io pin as an output which will give me a signal at 10hz (a pulse every time the lidar completes a full rotation). I went through the software user guide and figured out that using the below will activate the pin and output a pulse that I require.

set_config_param multipurpose_io_mode OUTPUT_FROM_ENCODER_ANGLE set_config_param sync_pulse_out_angle 360 reinitialize

When I try to check the output signal from the multiputpose_io pin, I get a flat line. I'm not sure what I am doing wrong. It'll be great if someone can help me out. TIA!

yulan0215 commented 3 years ago

Hi, I'm new to ROS and it will be great if someone could help me out with this. I am trying to configure the multipurpose_io pin as an output which will give me a signal at 10hz (a pulse every time the lidar completes a full rotation). I went through the software user guide and figured out that using the below will activate the pin and output a pulse that I require.

set_config_param multipurpose_io_mode OUTPUT_FROM_ENCODER_ANGLE set_config_param sync_pulse_out_angle 360 reinitialize

When I try to check the output signal from the multiputpose_io pin, I get a flat line. I'm not sure what I am doing wrong. It'll be great if someone can help me out. TIA!

I encountered the same problem did you solve it? I used the multipurpose_io for NMEA input but I also want to output the PPS signal, do you think it is feasible? Thanks and I am looking forward to you reply!

apabu commented 3 years ago

If you look at the end of the hardware user guide of OS1 (https://data.ouster.io/downloads/hardware-user-guide-v1.13.0.pdf), it provides a hint about amplifying the signal from the multipurpose_io. When I measured the signal, I figured out that the output is less than 30mV. I needed a signal of amplitude 3.3-5V, so I used an op-amp to amplify the signal. I used this signal for time synchronization with cameras. I'm not sure if you can use the pin for both NMEA input and PPS output at the same time.

multipurpose_io
yulan0215 commented 3 years ago

If you look at the end of the hardware user guide of OS1 (https://data.ouster.io/downloads/hardware-user-guide-v1.13.0.pdf), it provides a hint about amplifying the signal from the multipurpose_io. When I measured the signal, I figured out that the output is less than 30mV. I needed a signal of amplitude 3.3-5V, so I used an op-amp to amplify the signal. I used this signal for time synchronization with cameras. I'm not sure if you can use the pin for both NMEA input and PPS output at the same time.

multipurpose_io

Thanks anyway. I guess it is not feasible because there is just one mode for the multipurpose, if I select input it could not output but I do not know.

Krishtof-Korda commented 3 years ago

If you look at the end of the hardware user guide of OS1 (https://data.ouster.io/downloads/hardware-user-guide-v1.13.0.pdf), it provides a hint about amplifying the signal from the multipurpose_io. When I measured the signal, I figured out that the output is less than 30mV. I needed a signal of amplitude 3.3-5V, so I used an op-amp to amplify the signal. I used this signal for time synchronization with cameras. I'm not sure if you can use the pin for both NMEA input and PPS output at the same time.

multipurpose_io

You are correct on the need for amplification. This is something we are improving in our next revision of the sensor. You cannot use the M_IO pin for both NMEA input and PPS output.

Janphr commented 1 year ago

If you look at the end of the hardware user guide of OS1 (https://data.ouster.io/downloads/hardware-user-guide-v1.13.0.pdf), it provides a hint about amplifying the signal from the multipurpose_io. When I measured the signal, I figured out that the output is less than 30mV. I needed a signal of amplitude 3.3-5V, so I used an op-amp to amplify the signal. I used this signal for time synchronization with cameras. I'm not sure if you can use the pin for both NMEA input and PPS output at the same time.

multipurpose_io

You are correct on the need for amplification. This is something we are improving in our next revision of the sensor. You cannot use the M_IO pin for both NMEA input and PPS output.

Hey, I'm facing the same problem right now, but I'm also measuring a lot of noise. Is this normal? (see picture)

Is there a more detailed description for the amplification, ideally with a list of the required electronic components?

image

kairenw commented 1 year ago

Hi - this Github is to support the Ouster SDK. Please contact our customer support with your question here