Fixed T1000-E temperature, lux and BME280 sensor reading accuracies

[entr0p1]

• Fix T1000-E thermistor math by clamping the divider supply to the regulated 3V3 rail for consistent temp readings across battery voltages
• Power and sample the light sensor correctly (enable 3V3 rail, set ADC pins to input at boot)

[IoTThinks]

Could you compile a zip or uf2?
We can test for you.

[entr0p1]

Sure, here's the BLE companion:

firmware.uf2.zip

Let me know if you want a different flavour.

[IoTThinks]

This is my T1000e with black battery.
Before your patch.

This is your patch.
The temperature is acceptable correct around 28-30*C.
The LUX is better from 0 to 10. Still a bit low indoor. May be it is due to T1000-e'case?

[entr0p1]

That's actually a quirk of the sensor - it returns a "percentage" of light (whatever that's supposed to mean), not a raw lux value. I had the same confusion.

I tested returning the value as a percentage which works, but the label for the sensor in the app just shows as "Percentage" not "Luminosity". So I deemed it too confusing and rolled that part back.

[entr0p1]

Have added in a second fix - this time for the BME280. Have tested on the T-echo and temp readings are looking a lot more accurate now. If anyone else can test a node with BME280 that would be awesome (can provide firmware file, just specify which).

[IoTThinks]

I have tested the BME280 and BME680 yesterday with similar initiation yesterday.
Not much different with and without the initiation when I tested.