Rust ADS1x1x ultra-small, low-power analog-to-digital converters (ADC) driver

This is a platform agnostic Rust driver for the ADS1013, ADS1014, ADS1015, ADS1113, ADS1114 and ADS1115 ultra-small, low-power analog-to-digital converters (ADC), based on the embedded-hal traits.

Introductory blog post

This driver allows you to:

• Set the operating mode to one-shot or continuous. See: into_continuous().
• Make a measurement in one-shot mode. See: read().
• Start continuous conversion mode. See: start().
• Read the last measurement made in continuous conversion mode. See: read().
• Set the data rate. See: set_data_rate().
• Set the full-scale range (gain amplifier). See set_full_scale_range().
• Read whether a measurement is in progress. See: is_measurement_in_progress().
• Set the ALERT/RDY pin to be used as conversion-ready pin. See: use_alert_rdy_pin_as_ready().
• Comparator:
  • Set the low and high thresholds. See: set_high_threshold_raw().
  • Set the comparator mode. See: set_comparator_mode().
  • Set the comparator polarity. See: set_comparator_polarity().
  • Set the comparator latching. See: set_comparator_latching().
  • Set the comparator queue. See: set_comparator_queue().
  • Disable the comparator. See: disable_comparator().

The devices

The devices are precision, low power, 12/16-bit analog-to-digital converters (ADC) that provide all features necessary to measure the most common sensor signals in an ultra-small package. Depending on the device, these integrate a programmable gain amplifier (PGA), voltage reference, oscillator and high-accuracy temperature sensor.

The devices can perform conversions at data rates up to 3300 samples per second (SPS). The PGA offers input ranges from ±256 mV to ±6.144 V, allowing both large and small signals to be measured with high resolution. An input multiplexer (MUX) allows to measure two differential or four single-ended inputs. The high-accuracy temperature sensor can be used for system-level temperature monitoring or cold-junction compensation for thermocouples.

The devices operate either in continuous-conversion mode, or in a single-shot mode that automatically powers down after a conversion. Single-shot mode significantly reduces current consumption during idle periods. Data is transferred through I2C.

Here is a comparison of the caracteristics of the devices:

Device	Resolution	Sample Rate	Channels	Multi-channel	Features
ADS1013	12-bit	Max 3300 SPS	1	N/A
ADS1014	12-bit	Max 3300 SPS	1	N/A	Comparator, PGA
ADS1015	12-bit	Max 3300 SPS	4	Multiplexed	Comparator, PGA
ADS1113	16-bit	Max 860 SPS	1	N/A
ADS1114	16-bit	Max 860 SPS	1	N/A	Comparator, PGA
ADS1115	16-bit	Max 860 SPS	4	Multiplexed	Comparator, PGA

Datasheets:

• ADS101x
• ADS111x

Usage

To use this driver, import this crate and an embedded_hal implementation, then instantiate the appropriate device. In the following examples an instance of the device ADS1013 will be created as an example. Other devices can be created with similar methods like: Ads1x1x::new_ads1114(...).

Please find additional examples using hardware in this repository: driver-examples

use linux_embedded_hal::I2cdev;
use nb::block;

use ads1x1x::{channel, Ads1x1x, SlaveAddr};

fn main() {
    let dev = I2cdev::new("/dev/i2c-1").unwrap();
    let mut adc = Ads1x1x::new_ads1013(dev, SlaveAddr::default());
    let value = block!(adc.read(channel::DifferentialA0A1)).unwrap();
    println!("Measurement: {}", value);
    // get I2C device back
    let _dev = adc.destroy_ads1013();
}

Support

For questions, issues, feature requests, and other changes, please file an issue in the github project.

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contributing

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.