ADS1115 4-Channel 16-Bit A/D Converter

Component/Hub

The ads1115 domain creates a global hub so that you can later create individual sensors using the ADS1115 Sensor Platform. To use this hub, first setup the I²C Bus and connect the sensor to the pins specified there.

../../_images/ads1115-full.jpg

ADS1115 16-Bit ADC.

ads1115:
  - address: 0x48

Configuration variables:

  • address (Required, int): The i²c address of the sensor. See I²C Addresses for more information.

  • continuous_mode (Optional, boolean): Set if the ADS1115 should continuously measure voltages or only measure them when an update is called. Please enable this for the CT Clamp Current Sensor component. Defaults to off.

  • id (Optional, ID): Manually specify the ID for this ADS1115 Hub. Use this if you want to use multiple ADS1115 hubs at once.

I²C Addresses

In order to allow multiple sensors to be connected to the same i²c bus, the creators of this sensor hardware have included some options to change the i²c address.

  • If the address pin is pulled to GND, the address is 0x48 (Default).

  • If the address pin is pulled to VCC, the address is 0x49.

  • If the address pin is tied to SDA, the address is 0x4a.

  • If the address pin is tied to SCL, the address is 0x4B.

Sensor

The ads1115 sensor allows you to use your ADS1115 sigma-delta ADC sensors (datasheet, Adafruit_ADS1115) or your ADS1015 sigma-delta ADC sensors (datasheet, Adafruit_ADS1015) with ESPHome. First, setup an ADS1115 Hub for your ADS1115 sensor and then use this sensor platform to create individual sensors that will report the voltage to Home Assistant.

../../_images/ads1115-ui.png 
ads1115:
  - address: 0x48
sensor:
  - platform: ads1115
    multiplexer: 'A0_GND'
    gain: 6.144
    name: "ADS1115 Channel A0-GND"

Configuration variables:

  • multiplexer (Required): The multiplexer channel of this sensor. Effectively means between which pins you want to measure voltage.

  • gain (Required, float): The gain of this sensor.

  • ads1115_id (Optional, ID): Manually specify the ID of the ADS1115 Hub you want to use this sensor.

  • update_interval (Optional, Time): The interval to check the sensor. Defaults to 60s.

  • resolution (Optional, string): the resolution of this sensor. Defaults to 16 bits.

  • 16 bits

  • 12 bits

  • All other options from Sensor.

Multiplexer and Gain

Note

As per (datasheet, Adafruit) Section 7.3 Note 2: “No more than VDD + 0.3V must be applied to the analog inputs of the device.” This means if you power the device with 3.3V, take care not to supply the 4 AIN pins with more than 3.6V.

The ADS1115 has a multiplexer that can be configured to measure voltage between several pin configurations. These are:

  • A0_A1 (between Pin 0 and Pin 1)

  • A0_A3 (between Pin 0 and Pin 3)

  • A1_A3 (between Pin 1 and Pin 3)

  • A2_A3 (between Pin 2 and Pin 3)

  • A0_GND (between Pin 0 and GND)

  • A1_GND (between Pin 1 and GND)

  • A2_GND (between Pin 2 and GND)

  • A3_GND (between Pin 3 and GND)

Additionally, the ADS1115 has a Programmable Gain Amplifier (PGA) that can help you measure voltages in different ranges, these are:

  • 6.144 (measures up to 6.144V)

  • 4.096 (measures up to 4.096V)

  • 2.048 (measures up to 2.048V)

  • 1.024 (measures up to 1.024V)

  • 0.512 (measures up to 0.512V)

  • 0.256 (measures up to 0.256V)

The ADS1115 can be used with defaults settings. When using an ADS1015, the resolution has to be specified and should be defined to 12_BITS (or equivalent notations like 12 BITS or 12 bits).

See Also