Finally getting a chance to look at this again.

I want to thank everyone for their thoughtful responses.

I'm afraid I have a IoT noob question. How do I go about installing an .ipk file? I'd like to have a go with WereCatf's libsoc. Seems like the path of least resistance.

Thanks!

Art

Wow, I must be a total doof. I tried to use opkg to attempt to install python-libsoc_xxxxxxxxxx and I just got an error:

Installing python-libsoc (0.8.2-230117-1) to root...
Collected errors:

• satisfy_dependencies_for: Cannot satisfy the following dependencies for python-libsoc:

•  pkg-config *    libsoc *
  

• opkg_install_cmd: Cannot install package python-libsoc.

Ouch....

Finally getting a chance to look at this again.

I want to thank everyone for their thoughtful responses.

I'm afraid I have a IoT noob question. How do I go about installing an .ipk file? I'd like to have a go with WereCatf's libsoc. Seems like the path of least resistance.

Thanks!

Art

I have a Onion Omega2+ plugged into a CE PR32-3 (adapter), thence into a MCP23008 / PEIO4R4G5LE (4-relay "shield" with I2C interface).

Using a simple Python script, I was controlling the relays quickly. So far, so good.

I plugged a SI7020-A20 (temperature / humidity sensor) into the I2C bus. The LED lights up.

This device has no addressable registers, so has a different programming interface than what the onionI2C Python library provides. There is i2c.readBytes(), but no i2c.read(). I suspect this is the root of my problem, but I tried this Python script:

#!/usr/bin/env python
from OmegaExpansion import onionI2C
import time

i2c = onionI2C.OnionI2C()

i2c.write(0x40, [0xF5]) # 0x40 is the I2C address, 0xF5 is the command to start a conversion
time.sleep(0.5)

data = i2c .readBytes(0x40, 0x00, 2) # This device has no addressable registers, so this readBytes() call is suspect, but there is no i2c .read()

print "%x" %data[0]
print "%x" %data[1]

I get:

0

3f

Specced conversion gives RH of -5.88%. I've never heard of negative humidity!

I'm sure it's something really silly, but I have fiddled around a lot with the write(), writeBytes(), and readBytes() calls and not gotten anywhere.

It could be that I need to abandon Python and try to use more primitive functions that might be available in the C libraries, but I was sorta trying to avoid that. I haven't gotten anywhere with the cloud C compiler at all! All I get is an inert Web page that doesn't do anything.

Where is the "Bad CRC, using default environment" coming from? My O2+ shows the same thing and caused me a bit of worry...