example showing using gain capability

[ladyada]

we got a bunch o requests to add a gain demo to https://learn.adafruit.com/adafruit-4-channel-adc-breakouts/python-circuitpython

no rush but it is kinda a neat thing this chip can do :) the demo can just be a resistor divider with 1K and 100K ohm resistors. the voltage should end up being the same but the value will be different

[caternuson]

Use the 1k/100k with a pot for a variable voltage divider? So two setups - one with 1k, one with 100k. Ex with 100k:

Wired this up with an Itsy M4 and ADS1015, but same general idea:

Adafruit CircuitPython 3.1.2 on 2019-01-07; Adafruit ItsyBitsy M4 Express with samd51g19
>>> import board, busio
>>> import adafruit_ads1x15.ads1015 as ADS
>>> from adafruit_ads1x15.analog_in import AnalogIn
>>> i2c = busio.I2C(board.SCL, board.SDA)
>>> ads = ADS.ADS1015(i2c)
>>> chan = AnalogIn(ads, ADS.P0)
>>> ads.gain
1
>>> chan.value, chan.voltage
(84, 0.168082)
>>> ads.gain = 16
>>> ads.gain
16
>>> chan.value, chan.voltage
(1335, 0.167081)
>>>

[ladyada]

exactly!