IndexError: index out of range

[NateDKing]

I am trying to connect the RPLIDAR A1 to my windows laptop and am receiving this error:

PyRPlidar Info : device is connected
Traceback (most recent call last):
  File "c:\Users\Nate King\Documents\GitHub\Nate-Code\Vision Project\Lidar Test\Example.py", line 10, in <module>
    info = lidar.get_info()
  File "C:\Users\Nate King\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\pyrplidar.py", line 73, in get_info
    discriptor = self.receive_discriptor()
  File "C:\Users\Nate King\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\pyrplidar.py", line 42, in receive_discriptor
    discriptor = PyRPlidarResponse(self.lidar_serial.receive_data(RPLIDAR_DESCRIPTOR_LEN))
  File "C:\Users\Nate King\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\pyrplidar_protocol.py", line 110, in __init__
    self.sync_byte1 = raw_bytes[0]
IndexError: index out of range
PyRPlidar Info : device is disconnected

Here is the code I am using:

from pyrplidar import PyRPlidar

lidar = PyRPlidar()

lidar.connect(port="COM3", baudrate=115200, timeout=3)
# Linux   : "/dev/ttyUSB0"
# MacOS   : "/dev/cu.SLAB_USBtoUART"
# Windows : "COM3"

info = lidar.get_info()
print("info :", info)

health = lidar.get_health()
print("health :", health)

samplerate = lidar.get_samplerate()
print("samplerate :", samplerate)

scan_modes = lidar.get_scan_modes()
print("scan modes :")
for scan_mode in scan_modes:
    print(scan_mode)

lidar.disconnect()

Anyone have an idea what could be causing this?

[wanghaoNB]

不知道

[sir1st]

first, change the baudrate to 115200.
second, use the linux based system, not the windows.

[sir1st]

my rplidar a1 device doesn't work on win10 paltdorm, but with the same code(change the port from COM3 to /dev/ttyUSB0), it works on deepin os.

[wafflecat]

my rplidar a1 device doesn't work on win10 paltdorm, but with the same code(change the port from COM3 to /dev/ttyUSB0), it works on deepin os.

Make sure your LED goes green. You need to install the CP210x USB to UART bridge driver.
http://bucket.download.slamtec.com/a7a9b856b9f8e57aad717da50a2878d5d021e85f/LM204_SLAMTEC_rplidarkit_usermanual_A2M4_v1.1_en.pdf

The driver install is available in their SDK .zip.
https://www.slamtec.com/en/Support#rplidar-a-series

Verify everything works using frame_grabber.exe first.
https://github.com/Slamtec/rplidar_sdk/releases

[sir1st]

I did check everything else. the frame grambber works really good on win10 os. Here is the screen shot.

Sadly, once I start the simple_scan.py (with the config of lidar.connect(port="COM3", baudrate=115200, timeout=3)), the rplidar a1 doesn't work anymore. It even not rotates, just stay static... After I close this python program, the ridar starts rotation again..
Here is the totally logs:

PyRPlidar Info : device is connected
Traceback (most recent call last):
File "c:/Users/11747/Desktop/pyrplidar-master/examples/simple_scan.py", line 30, in
simple_scan()
File "c:/Users/11747/Desktop/pyrplidar-master/examples/simple_scan.py", line 16, in simple_scan
scan_generator = lidar.force_scan()
File "E:\Software\Anaconda3\lib\site-packages\pyrplidar.py", line 170, in force_scan
discriptor = self.receive_discriptor()
File "E:\Software\Anaconda3\lib\site-packages\pyrplidar.py", line 42, in receive_discriptor
discriptor = PyRPlidarResponse(self.lidar_serial.receive_data(RPLIDAR_DESCRIPTOR_LEN))
File "E:\Software\Anaconda3\lib\site-packages\pyrplidar_protocol.py", line 110, in init
self.sync_byte1 = raw_bytes[0]
IndexError: index out of range
PyRPlidar Info : device is disconnected
But this code (with the port="/dev/ttyUSB0") works really good on Deepin OS. I can bet that no hardware chagnes except the running os

[wjacobward]

Anyone have luck fixing this issue in Windows? I have the exact same problem. A1 lidar works fine in Slamtec's frame_grabber, but fails with "index out of range" with this library. That seems to indicate that there is no data being sent by the device over the serial port.

[kamil52512]

On Windows 10, modifying a file the pyrplidar_serial.py from library helps.
In line 13 replace:
"self._serial = serial.Serial(port, baudrate, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=timeout, dsrdtr=True)"
to
" self._serial = serial.Serial(port, baudrate, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=timeout, dsrdtr=False)"

[razoentaki]

On Windows 10, modifying a file the pyrplidar_serial.py from library helps. In line 13 replace: "self._serial = serial.Serial(port, baudrate, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=timeout, dsrdtr=True)" to " self._serial = serial.Serial(port, baudrate, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=timeout, dsrdtr=False)"

Tried, but it did not solve the problem.

[JhiWhoonKang]

Anyone who solved this problem?