What example code did you use? i am using rpi3 with the adafruit example code and can't get the device to come up with i2cdetect -y 1?

You should check if you've got it wired correctly (Vcc to RPi 3.3v, SDA to SDA, SCL to SCL, and GND to GND). Also ensure you're wired to I2C Bus 1 (pins 3 and 5) and not Bus 0 (pins 27 and 28). Also double check that you've enabled I2C on your pi and, if possible, works on a known good device. You could also double check your soldering. If everything checks out, your ADC may just be dead.

Does this support multiple i2c addresses? can i configure them to use two of these with different addresses on the same bus? if so, how?

Yes, the ADS1115 supports multiple I2C addresses. I'm writing this from memory but I recall the default address is 0x48 and there is an addr pin on the device - tie the addr pin to VDD and you get address 0x49. Just lookup the data sheet on google all the info about using the device and how to set the addresses is in the data sheet. I did have a project, in the past, where I used 2 of these devices on addresses 0x48 and 0x49 I2C and everything worked fine. Hope that helps.

Can I run several of these on the same i2c bus, but with different ground references? I'd like to have one of these "per cell" in a battery string.

If your not using common ground with your bus then the signal that is being sent to the bus won’t be a closed circuit resulting in error.

Where do I find the schematic and sample code?

Adafruit has Arduino library and example code. Specification sheets can be found at www.ti.com.

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HiLetgo 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: 29058420

Details

Brand
HiLetgo
Maximum Supply Voltage
5.5 Volts
Minimum Supply Voltage
2 Volts
Mounting Type
Board Mount
Number of Pins
8

⚡2.0V-5.5V wide voltage range

🔌4 versatile input channels

🔢16-bit ultra-precise ADC

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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 or 2 differential signals with flexible channel configurations.
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 bus.
PROGRAMMABLE GAIN AMPLIFIER - Boost tiny signals up to 16x for maximum measurement accuracy and dynamic range.

The HiLetgo ADS1115 is a compact, high-precision 16-bit ADC breakout board featuring 4 input channels and a programmable gain amplifier. Designed for microcontrollers lacking analog inputs, it operates over a wide 2.0V to 5.5V supply range and communicates via I2C. Ideal for Raspberry Pi and Arduino projects, it offers flexible data rates (8-860 samples/sec) and ultra-low power consumption with single-shot auto shut down mode.

Specifications

ASIN	B01DLHKMO2
Best Sellers Rank	#74,941 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #103 in Signal Converters
Brand Name	HiLetgo
Customer Reviews	4.4 4.4 out of 5 stars (166)
Interface	I2C
Manufacturer	HiLetgo
Material Type	ferrite
Maximum Supply Voltage	5.5 Volts
Minimum Supply Voltage	2 Volts
Mounting Type	Board Mount
Number of Channels	4
Number of Pins	8
Part Number	3-01-1062-A

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