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

My items arrived very quickly and were exactly as advertised. I'm very happy with my purchase!

This ADC initially behaved like a 12-bit ADC, and I gave it a bad review. But I was wrong. It appears the glitch was in the ADC code and not the hardware. If your ADC does not behave like a 16-bit ADC, experiment with the code settings.

Not genuine ADS1115 circuits. Gives bad readings and upstream kernel drivers can't communicate properly with it. Bought genuine ones and everything worked fine. AVOID

Great little device. Simple I2C interface. Configure and Read. Includes multiple gain ranges (+/-6v to +/-250mV) from a single supply. Yes it measures below ground with a single supply. The differential measurement capability is amazing (measuring current through a resistor in both directions). Used this device to measure shunt currents on a solar battery system (0.000750 ohm resistor). Connected to a Raspberry PI Zero for I2C communication and Wifi connectivity. Amazingly accurate. The different sampling rates offer 'effective' filtering for noisy signals and the fast sampling is great for higher speed signals.

Seeing all the poor reviews here, wasn't sure if I'd get fake, bad or mislabelled chips. Bought and tested three using an Arduino and they work perfectly with the ADS1115 Arduino library from wollewald/ADS1115_WE. The library has a sketch to identify the chips correctly and it identified all three boards as having true ADS1115 and it tested for and saw all 16 bits of sampling correctly. For the price and convenience, cant beat these. Came with a header to solder onto to use on a breadboard. BTW, much cheaper than the digikey versions.