The ADS1015 is a high-speed, 12-bit Analog-to-Digital Converter (ADC) designed for precision and ease of use via an I2C interface. This "BRPI" variant is a compact breakout board commonly used to add high-quality analog inputs to microcontrollers that lack them (like the Raspberry Pi) or to provide a faster alternative to standard 10-bit ADCs found on Arduino boards.

Specifications

• Resolution: 12-bit
• Operating Voltage: 2.0V to 5.5V DC
• Interface: I2C with four selectable addresses
• Channels: 4 Single-Ended or 2 Differential inputs
• Programmable Data Rate: 128 SPS to 3300 SPS (Samples Per Second)
• Low Current Consumption: 150uA (Continuous mode)
• Internal PGA: Programmable Gain Amplifier (up to x16)
• Internal Reference: Low-drift voltage reference

Features

• High-Speed Sampling: At up to 3300 samples per second, the ADS1015 is significantly faster than its 16-bit counterpart (ADS1115), making it ideal for monitoring rapidly changing signals.
• Programmable Gain (PGA): Includes an onboard amplifier that allows you to increase the sensitivity for very small signals, enabling you to measure ranges as small as ±256mV with high resolution.
• Flexible Addressing: By connecting the ADDR pin to GND, VDD, SDA, or SCL, you can operate up to four modules on the same I2C bus for a total of 16 analog channels.
• Continuous or Single-Shot Mode: Automatically powers down after a single conversion in single-shot mode, drastically reducing power consumption for battery-operated devices.
• Programmable Comparator: Features a digital comparator that can trigger the ALERT pin based on defined high/low thresholds, allowing the system to react to voltage changes without constant polling.

Pin Configuration

• VDD: Power Supply (2.0V – 5.5V).
• GND: Ground.
• SCL: I2C Clock line.
• SDA: I2C Data line.
• ADDR: I2C Address select pin (Connect to GND for default 0x48).
• ALRT: Programmable comparator output or conversion ready signal.
• A0-A3: Analog Input channels.

Common Applications

• Raspberry Pi Projects: Since the Raspberry Pi lacks analog-to-digital converters, this module is the standard choice for reading analog sensors.
• Battery Monitoring: Measuring voltage levels in portable electronics with higher precision than basic microcontrollers.
• Sensor Interfacing: Connecting light, sound, or pressure sensors that require fast response times.
• Portable Instrumentation: Used in handheld data loggers where low power and small size are essential.

Usage Tips

• Voltage Safety: Never apply a voltage to the A0-A3 pins that is higher than VDD + 0.3V.
• Logic Levels: The I2C logic level follows the VDD voltage. If you power the module with 3.3V, the SDA/SCL lines will be 3.3V, making it safe for direct connection to a Raspberry Pi or ESP32.
• Speed vs. Resolution: Choose the ADS1015 (12-bit) when high-speed sampling is required; choose the ADS1115 (16-bit) when maximum precision for slow-moving signals is the priority.