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LoRa Radio No Connection
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

LoRa Radio No Connection

by bpjmalone on Fri Jun 04, 2021 7:55 am

Hello, I am attempting this project with the LoRa Radio Bonnet for Raspberry Pi along with a Raspberry Pi 3B+: https://learn.adafruit.com/lora-and-lorawan-radio-for-raspberry-pi/overview. I believe that there is a hardware issue because the OLED does not do anything when running the test Python code listed in the project. I soldered wires on the Bonnet based on the diagram here: https://learn.adafruit.com/lora-and-lorawan-radio-for-raspberry-pi/raspberry-pi-wiring. E.g., SDA on Bonnet to SDA on Pi, SCL on Bonnet to SCL on Pi, etc. I am using a T-Cobber Plus, by the way. I plan to upload pictures of my solder and make a schematic diagram to help troubleshoot any connection mistakes or workmanship issues.

Here is a full printout of the error message in the terminal window:
Code: Select all | TOGGLE FULL SIZE
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 154, in __probe_for_device
    self.i2c.writeto(self.device_address, b"")
  File "/usr/local/lib/python3.7/dist-packages/busio.py", line 121, in writeto
    return self._i2c.writeto(address, buffer, stop=stop)
  File "/usr/local/lib/python3.7/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 49, in writeto
    self._i2c_bus.write_bytes(address, buffer[start:end])
  File "/usr/local/lib/python3.7/dist-packages/Adafruit_PureIO/smbus.py", line 308, in write_bytes
    self._device.write(buf)
OSError: [Errno 121] Remote I/O error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 160, in __probe_for_device
    self.i2c.readfrom_into(self.device_address, result)
  File "/usr/local/lib/python3.7/dist-packages/busio.py", line 111, in readfrom_into
    return self._i2c.readfrom_into(address, buffer, stop=stop)
  File "/usr/local/lib/python3.7/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 56, in readfrom_into
    readin = self._i2c_bus.read_bytes(address, end - start)
  File "/usr/local/lib/python3.7/dist-packages/Adafruit_PureIO/smbus.py", line 179, in read_bytes
    return self._device.read(number)
OSError: [Errno 121] Remote I/O error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "rfm9x_check.py", line 36, in <module>
    display = adafruit_ssd1306.SSD1306_I2C(128, 32, i2c, reset=reset_pin)
  File "/usr/local/lib/python3.7/dist-packages/adafruit_ssd1306.py", line 220, in __init__
    self.i2c_device = i2c_device.I2CDevice(i2c, addr)
  File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 50, in __init__
    self.__probe_for_device()
  File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 163, in __probe_for_device
    raise ValueError("No I2C device at address: 0x%x" % self.device_address)
ValueError: No I2C device at address: 0x3c


I am stuck and would really appreciate any help that people can offer. Please let me know what other information I can provide. Thanks!

bpjmalone
 
Posts: 15
Joined: Tue Mar 05, 2019 1:17 pm

Re: LoRa Radio No Connection

by adafruit_support_mike on Sat Jun 05, 2021 10:12 pm

Post a photo showing your hardware and connections and we'll take a look. 800x600 images usually work best.

adafruit_support_mike
 
Posts: 62799
Joined: Thu Feb 11, 2010 2:51 pm

Re: LoRa Radio No Connection

by bpjmalone on Sun Jun 13, 2021 9:32 pm

Hi, thanks for helping me out. My amateurish solder: [img]PXL_20210613_180757855-min(1).jpg[/img]. The T-Cobbler: [img]PXL_20210613_180842690-min.jpg[/img]. I can make a schematic diagram to make things clearer.
Attachments
PXL_20210613_180757855-min(1).jpg
PXL_20210613_180757855-min(1).jpg (620.72 KiB) Viewed 75 times
PXL_20210613_180842690-min.jpg
PXL_20210613_180842690-min.jpg (836.02 KiB) Viewed 75 times
PXL_20210613_180842690-min.jpg
PXL_20210613_180842690-min.jpg (836.02 KiB) Viewed 75 times

bpjmalone
 
Posts: 15
Joined: Tue Mar 05, 2019 1:17 pm

Re: LoRa Radio No Connection

by adafruit_support_mike on Mon Jun 14, 2021 9:43 pm

In the first photo, it looks like there's a solder bridge between the pins above the numbers 18, 27, and 22. I also see some exposed gold on one of the other pads.

Redo the solder joints, making sure there are no connections from one pad to the next, and that each joint covers its pad completely.

adafruit_support_mike
 
Posts: 62799
Joined: Thu Feb 11, 2010 2:51 pm

Please be positive and constructive with your questions and comments.