PCA9685 found in i2cdetect but throws

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
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1

I found i2c 0x40 and 0x70 in bus 0

1

and python coding :

from adafruit_servokit import ServoKit
kit = ServoKit(channels=16)

and I get an error

Traceback (most recent call last):
File “/usr/local/lib/python3.8/dist-packages/adafruit_bus_device/i2c_device.py”, line 176, in __probe_for_device
self.i2c.writeto(self.device_address, b"")
File “/usr/local/lib/python3.8/dist-packages/busio.py”, line 175, in writeto
return self._i2c.writeto(address, buffer, stop=stop)
File “/usr/local/lib/python3.8/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py”, line 52, in writeto
self._i2c_bus.write_bytes(address, buffer[start:end])
File “/usr/local/lib/python3.8/dist-packages/Adafruit_PureIO/smbus.py”, line 314, in write_bytes
self._device.write(buf)
TimeoutError: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File “/usr/local/lib/python3.8/dist-packages/adafruit_bus_device/i2c_device.py”, line 182, in __probe_for_device
self.i2c.readfrom_into(self.device_address, result)
File “/usr/local/lib/python3.8/dist-packages/busio.py”, line 165, in readfrom_into
return self._i2c.readfrom_into(address, buffer, stop=stop)
File “/usr/local/lib/python3.8/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py”, line 59, in readfrom_into
readin = self._i2c_bus.read_bytes(address, end - start)
File “/usr/local/lib/python3.8/dist-packages/Adafruit_PureIO/smbus.py”, line 181, in read_bytes
return self._device.read(number)
TimeoutError: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File “/home/morse/chimLabs/ServoController.py”, line 2, in
kit = ServoKit(channels=16)
File “/usr/local/lib/python3.8/dist-packages/adafruit_servokit.py”, line 89, in init
self._pca = PCA9685(
File “/usr/local/lib/python3.8/dist-packages/adafruit_pca9685.py”, line 141, in init
self.i2c_device = i2c_device.I2CDevice(i2c_bus, address)
File “/usr/local/lib/python3.8/dist-packages/adafruit_bus_device/i2c_device.py”, line 63, in init
self.__probe_for_device()
File “/usr/local/lib/python3.8/dist-packages/adafruit_bus_device/i2c_device.py”, line 185, in __probe_for_device
raise ValueError(“No I2C device at address: 0x%x” % self.device_address)
ValueError: No I2C device at address: 0x40
Exiting…
Cleaning up pins

========================================

Package: nvidia-jetpack
Version: 4.6.1-b110

ubuntu 20.04 update by Install Ubuntu 20.04 on Jetson Nano - Q-engineering
adafruit-circuitpython-servokit==1.3.13

Thank you for support.

3

hello chimlabs2022,

please refer to similar issue, Topic 178453.
is it hardware issue? you may also check whether you’re able to use i2cget to check devices.
thanks

4

Yes, i can use i2cget and return hexadecimal. But this line not working :

from adafruit_servokit import ServoKit
kit = ServoKit(channels=16)

Thank you for your support.

5

hello chimlabs2022,

you may dig into this, what’s the error reports and please try debug this.

6

Thank you for your support.

8

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