ADS1115

Connects over

I²C

Address

0x48 (or 0x49, 0x4A, 0x4B)

Made by

Texas Instruments

Datasheet

ti.com

Use it

hardware {
    device ads1115: ADS1115
}

every 1s {
    let value: int = ads1115.read_raw(1)
    log("ads1115", "read_raw={value}")
}

On its own, the declaration puts the ADS1115 on the first I²C bus (SDA 21, SCL 22 on the ESP32) at 0x48. To choose the pins or the address, declare the bus and attach the device: device ads1115: ADS1115 on i2c0 at 0x49 with i2c i2c0(sda: 21, scl: 22).

Methods

• ads1115.read_raw(channel: int) -> int

  Raw ADC value

• ads1115.voltage(channel: int) -> float

  Voltage in V

Wiring

Specifications

Voltage

2.0V – 5.5V

Current

150 μA active, 0.5 μA standby

Channels

4 single-ended or 2 differential

Resolution

16-bit (15-bit single-ended)

Sample rate

8 to 860 SPS

Interface speed

I²C up to 3.4 MHz

Tips

• Programmable gain amplifier (±0.256V to ±6.144V) — set range to match your signal, larger range loses resolution.
• Datasheet caveat: max input voltage = VDD + 0.3V regardless of PGA setting.
• Use single-shot mode to save power; continuous mode samples non-stop.

Alternatives worth knowing:

• ADS1015: 12-bit version, cheaper, faster (3300 SPS) but coarser resolution.
• MCP3008: SPI 10-bit 8-channel — choose if you need more channels and don't care about resolution.