ADS1115 16-bit ADC

Name: ADS1115 16-bit ADC
Brand: Texas Instruments
Availability: InStock

ADS1115

Texas Instrumentsinterface io display

The ADS1115 is a low-power, 16-bit analog-to-digital converter with an I2C interface. It features a programmable gain amplifier, a multiplexer for up to four single-ended or two differential inputs, and a digital comparator for alert functions.

Manufacturer datasheet

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In stock

Specifications

Resolution: 16 Bits
Operating Voltage: 2.0 to 5.5 V
Supply Current: 150 µA
Max Sample Rate: 860 SPS
Min Sample Rate: 8 SPS
Interface: I2C
Operating Temperature Range: -40 to +125 °C
Input Channels: 4 single-ended or 2 differential
Package: X2QFN-10, SOT-10, VSSOP-10
Full Scale Input Voltage Range: ±0.256 to ±6.144 V
Programmable Gain Amplifier: Yes
Comparator: Yes

Pinout

Pin	Name	Functions	Notes
1	ADDR	GPIO	I2C target address select
2	ALERT/RDY	GPIO	Comparator output or conversion ready. Open-drain output.
3	GND	GND	Ground
4	AIN0	ADC	Analog input 0
5	AIN1	ADC	Analog input 1
6	AIN2	ADC	Analog input 2
7	AIN3	ADC	Analog input 3
8	VDD	POWER	Power supply
9	SDA	I2C	Serial data input and output
10	SCL	I2C	Serial clock input

Interactive pinout

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ADS1115

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Starter code

Community starter examples — minimal, unofficial, and provided to get you wiring fast. Verify against the manufacturer datasheet before relying on them.

Arduino (C++)

Arduino library: Adafruit ADS1X15

arduino

// ADS1115 16-bit 4-channel ADC (I2C) — community starter example
#include <Adafruit_ADS1X15.h>

Adafruit_ADS1115 ads;

void setup() {
  Serial.begin(115200);
  if (!ads.begin()) { Serial.println("ADS1115 not found"); while (1) delay(10); }
}

void loop() {
  int16_t raw = ads.readADC_SingleEnded(0);   // channel A0
  Serial.print("A0="); Serial.print(raw);
  Serial.print("  V="); Serial.println(ads.computeVolts(raw), 4);
  delay(500);
}

MicroPython

MicroPython library: ads1x15 (robert-hh/ads1x15)

python

# ADS1115 (ESP32) — community starter example
# lib: robert-hh/ads1x15 (ads1x15.py on the board)
from machine import Pin, I2C
from ads1x15 import ADS1115
import time

i2c = I2C(0, scl=Pin(22), sda=Pin(21))
adc = ADS1115(i2c, address=0x48, gain=1)

while True:
    print(adc.read(0))      # channel 0 raw
    time.sleep_ms(500)

Wiring

Pin	Arduino Uno R3	ESP32 DevKitC (WROOM-32)	Notes
VDD	+5V	3V3	2.0-5.5 V
GND	GND	GND
SCL	A5/SCL	GPIO22	I2C clock
SDA	A4/SDA	GPIO21	I2C data
AIN0..AIN3	-	-	Analog inputs (single-ended or differential)

Typical uses

Precise 16-bit analog inputs over I2C
Adding ADC channels to the ESP32/Pi