Module ads1115 

Texas Instruments ADS1115 16-bit I2C analog-to-digital converter.

The ADS1115 turns an analog signal (a soil-moisture probe, a pH electrode, a divider) into a 16-bit reading, and a single Config register selects the input, the gain, the rate, and the comparator. This module builds and parses that Config register field by field and converts a raw conversion result into a voltage at the selected full-scale range, following the datasheet’s register tables and per-gain LSB sizes.

Modules

address

The I2C addresses the ADDR pin selects, by what it is tied to.

register

The ADS1115 register addresses, selected by the address pointer.

sim

An ADS1115 that is not there.

Structs

Ads1115

An ADS1115 on an I2C bus, converting one input on demand.

Config

A decoded ADS1115 Config register.

Sample

One conversion result with the gain it was taken at, so it converts to volts.

Enums

ComparatorLatch

Whether the comparator latches (Config bit 2).

ComparatorMode

The comparator mode (Config bit 4).

ComparatorPolarity

The ALERT/RDY pin polarity (Config bit 3).

ComparatorQueue

The comparator queue, or disable (Config bits 1:0).

DataRate

The output data rate (Config bits 7:5), in samples per second.

Mode

The conversion mode (Config bit 8).

Mux

The input multiplexer setting (Config bits 14:12).

Pga

The programmable gain amplifier’s full-scale range (Config bits 11:9).

Constants

CONFIG_RESET

The power-on value of the Config register (0x8583).

CONVERSION_POLLS

How many times the Config register is polled, 1 ms apart, after the conversion time has elapsed before the conversion is called overdue.

POWER_UP_MICROS

The time from a stable supply until the part accepts a transfer, in microseconds.

Functions

conversion_micros

The longest one conversion takes at a data rate, in microseconds.

to_nanovolts

Converts a raw conversion result to nanovolts at the selected full-scale range.

to_volts

Converts a raw conversion result to volts at the selected full-scale range.