Frans ov ads1115 settings

[FransOv]

Description:

Related issue (if applicable): fixes #

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.2.3
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[FransOv]

The support for the ADS1115 Analog to Digital converter currently has hard-coded settings for input mode (Singel-Ended) and voltage range (6.144 mV). Using another mode or range would necessitate maintaining a specific image for each setting. This PR uses the sensor12 command to set input mode, Either Single-Ended or Differential and Voltage range.
The command accepts a single parameter of two characters. The first character is the input mode, either S(ingle-ended) or D(ifferential). The second character specifies the voltage range with a numeric value of 0-5 corresponding with a voltage range of respectively 6.144, 4.096, 2.048, 1.024, 512 and 256 mV. The command responds with a json string with the settings. E.g.
15:53:25.400 CMD: sensor12 d4
15:53:25.406 MQT: stat/tasmota_CD4398/RESULT = {"ADS1115":{"Settings":"D4","Mode":"Differential","Range":512,"Unit":"mV"}}

[barbudor]

Thanks for your contribution
I think the little change below would make it much more usefull

[barbudor]

So in single ended mode, as before, the driver supports channels 0..3 which are AIN0 to AIN3.
In the differential mode that you added, only 2 channels, as expected. But those 2 channels are

• 0 = AIN0-AIN1 and
• 1 = AIN0-AIN3

which makes AIN2 useless.
It would be more versatile to use:

• 0 = AIN0 - AIN1
• 3 = AIN2 - AIN3

Which can be easily achieved by using

config |= (ADS1115_REG_CONFIG_MUX_DIFF_0_1 + (0x3000 * channel));

[FransOv]

You are quite right. I'll change it this way..

[FransOv]

Done, took two tries. I realy should no do a commit on a tablet.