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

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.

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.

I purchased the devices knowing that I would be using them in full differential mode, however having had experience with defective devices before I set up a test fixture to check operation. I have a full anti-static configuration for soldering so I was confident that no over voltage on the sensitive inputs would occur. I soldered the header onto the device and placed it into my test fixture. I first checked that I could find the device on both i2c busses on the RPi 4. Next I tested the command to program the configuration register. It worked. I configured the chip for single ended inputs with the mux placing the other connection to ground. The test fixture had a 5K pot between 3.3V and ground, adjusted to +1.75 V at the wiper. I used the default PGA setting of 0 - +2.048V. With the +1.75 input to the A0 input, the output was 0xD023, a negative number! Moving the input to A1 the output became 0x31DC. Both the A2 and A3 inputs resulted in 0 as an output. Not exactly what one expects. Selecting the second AD converter resulted in essentially the same results. Negative number on input A0, positive on A1, and zero on both A2 and A3. The values were different from the first AD, but not that much, and no matter how you manipulate the output, the numbers are wrong for the input value., I'm well past the return date, even though I didn't open the anti-static bags until yesterday. My conclusion. The devices were defective when packaged. TEST DEVICES IMMEDIATELY ON RECEIPT! THE VENDORS SHIP BAD DEVICES!

Had one of three DOA

The boards I received are loaded with the ADS1015 chip. This is a 12-bit ADC, not 16. Luckily it's handled with the same driver, just not the performance advertised.

Easy to program and has a unique addressing system where you can fit 4 of these devices on one IO circuit. Can fit 4 analog circuits onto one of these boards and receive signals from all of them while only needing two inputs from your raspberry pi. That means you can read 16 separate analog signals using only two inputs, voltage, and ground connections from your computing device. Would recommend to anyone who is learning hardware programming or needs an ADC.

Works well! Nice quality! NOTE PGA is set to full scale of +/-6.144 VDC. Read datasheet to under stand PGA. Currently using on sonoff basic Ver 2 flashed with Sonoff-Tasmota 6.6.0 senors firmware connected via RX-TX pins in IC2 module settings mode . Due the firmware reads the direct bit value I created two rules that converts this bit value to a normal voltage reading. Will work on getting the rules posted in the wiki.....fyi pics are from ADS1115 reading a used AA battery....with rules and openhab paper UI showing values. Cheers....!

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

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