how to use 2 boards to get 8 channels? are the I2C addresses configurable?

Yes, these boards are addressable. You short ADDR pin to Vcc, or GND or SDA or SCL to program board address. You can use maximum 4 of these boards, total 16 single ended channels or 8 differential. See 5th image on Amazon page for these boards or go to Adafruit website for more details. BTW be aware of knock off ICs. Many boards I worked with were advertised and sold as 16 bit but actual board worked as 12-bit only. So if you work with these and have problems getting 16-bit resolution...you have been forewarned :). Good luck.

Can this read differential voltages higher than the input voltage? I want to read cell voltages in a 48v battery pack

If you use a voltage divider with two resistors you can. Search google voltage divider. But you lose a little bit accuracy. There are good videos on YouTube about this ADS1115 explain all that.

Could I use this to read voltages from 0 to 100 mV from a sensor?

Yes, you can read voltages from 0 to 5V. Be careful not to apply more than 5V or you will destroy the IC.

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HiLetgo 3pcs ADS1115 16 Bit 16 Byte 4 Channel I2C IIC Analog-to-Digital ADC PGA Converter with Programmable Gain Amplifier High Precision ADC Converter Development Board for Arduino Raspberry Pi

HiLetgo 3pcs ADS1115 16 Bit 16 Byte 4 Channel I2C IIC Analog-to-Digital ADC PGA Converter with Programmable Gain Amplifier High Precision ADC Converter Development Board for Arduino Raspberry Pi

Product ID: 267377896

⚡2.0V-5.5V wide voltage range

🎯16-bit ultra-precise ADC

🔌4-channel versatile input

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Description

⚙️ Elevate your DIY electronics with precision that professionals trust!

PINPOINT PRECISION - Experience crystal-clear 16-bit analog-to-digital conversion for your most demanding projects.
MULTI CHANNEL MASTERY - Seamlessly monitor up to 4 inputs simultaneously with flexible single-ended or differential modes.
POWER SAVVY PERFORMANCE - Single-shot mode with auto shut down keeps power consumption ultra-low at just 150μA.
PLUG PLAY I 2 C INTERFACE - Effortless integration with Arduino, Raspberry Pi, and other microcontrollers via I2C protocol.
PROGRAMMABLE GAIN AMPLIFIER - Boost tiny signals up to 16x for maximum accuracy and dynamic range in any environment.

The HiLetgo ADS1115 is a high-precision 16-bit analog-to-digital converter breakout board featuring 4 input channels and an I2C interface. It supports a wide voltage range (2.0V to 5.5V), includes a programmable gain amplifier for signal boosting, and offers power-efficient single-shot mode with auto shut down. Ideal for Arduino and Raspberry Pi projects requiring accurate analog signal measurement.

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