One of the most profound engineering channels i’ve found so far. Great videos.

only 800 views, you are undiscovered diamond. great thorough video

Excellent thorough yet easy to understand description of this chip and how the Adafruit handles it.

Simply the best review about ADS1115 on KZfaq. And my respect for reading the datasheet. I checked your other videos on the channel and now I realized, why this video is so good. One more good engineer in my sub-list. 😃👍 The only sad thing is that you use obsolete AVR MCU, but not modern and industry popular ARM Cortex-M MCU (like STM32). Even in the Arduino IDE/libraries they perform much-much better. And in this example with the external ADC on I2C bus, they provide NVIC and DMA to copy ADC values to MCU RAM mostly in the background, which is very economically in respect of CPU time.

Another wonderful video Robert - many thanks indeed. Those 10k resistors on the Adafruit schematic are pull-ups. it is the SCL & SDA etc chip outputs that route to the connector. Thanks again and keep up the good work. Cheers

Marvelous ! that was, oddly enough just what I was looking for ! and filled a few gaps and answered a few questions, this is a great time to be playing with microcontrollers and I thank all the companies like Adafruit and people like you who take the time to help people like me...I wonder what's in the pipeline, you did buy a load of displays, were theses just replacing stock or have you another instrument in mind ?...whatever it is I look forward to it ...cheers !

FYI: a lot of the limitations of the Adafruit library were fixed. Current version of Adafruit_ADS1X15 now supports all mux modes. I am figuring out too that it seems the ADS1115 can only do one conversion at a time, since there's really only one AD converter in the chip., In that case, if I am understanding correctly, continuous mode can only work with one input (single or differential) mode at a time, particularly considering there's only one conversion result registry. Current version of Adafruit library also supports non-blocking conversions in single-shot. The library provides an example on how to accomplish this. Basically you use the startADCReading(uint16_t mux, bool continuous) function where mux specifies the input setting, continuous specifies if it is one-shot or continuous. Library contains defines that you can use for the mux input

Again you made a very useful video, subscribed! I gave this comment also on another ADS1115 video: But please note that fake chips like you use in this video will behave (slightly) different than genuine chips. Accuracy and fakes cannot go together. (although I don't say this is the only reason for the instability you show in this video) Also many chinese break-out boards are cheaper than the original chip alone. (digikey: $6,38 for 1 piece, bulk will be lower but not coming near the 1,26 of the complete alie board) go figure ;) I spent days researching fakes so I can confidently state all of the above. I made the same mistake, buying chinese fakes, resulting in strange behaviour of finished projects including faillure of the fake chips after months of use etc. So I learned my lesson.

Hi Robert. Excellent as usual. These tutorial-like presentation are great knowledge and great reference material to come back to prior a design. They are like a small ebook on the virtual shelve of the designer. I like it very much. I don't know if you ever did a tutorial on DAC, but I would appreciate one on the double DAC from Microchip, the MCP4922, and reference voltage chips that are used to add precision to their output results. Thanks for all. Regards, RJM

Robert, thanks for this. I will use this tutorial measuring AC mains with current transformer

One side note: The ADS1115 can NOT measure more than the selected voltage in the gain (Which ever gain you decide to use) , across All the inputs (Not individually). In other words, if you have 4 18650 batteries, and you do not include a voltage divider for the full 16,8v on all 4 of the ADS1115 inputs, you will have the serial monitor and equipment spitting out weird values. If you plan on using it to measure 4 separate voltages, with the accumulative value of your preset gain setting (4.096V or 6.144V), then you could potentially measure 4 x flat batteries etc without the need for the voltage divider. Examples of this are here: kzfaq.info/get/bejne/r55meMtnv5eqkqc.html kzfaq.info/get/bejne/aN6jdMSUmbTNlWg.html Anyway, I thought I would just share this with anyone watching, as this drove me nuts trying to figure out why every time the solar charge controllers were charging the batteries, the first bank showed the exact inverse of the second bank, and actually displayed the batteries draining while in fact they were charging, but because the gain voltage was maxed out, it then inverted the balance to show that excess voltage as a lower number. Infuriating to say the least. Texas Instruments obviously does not display this little nugget of information in their data sheet, which would have avoided many days of scratching a bald spot in my head! Ps. Thank you for the Very informative video on this item, and as much of a headache that this has been, I could NEVER use the built in analogue inputs of Arduino Ever Again, as the ADS1115's accuracy can just not be matched. The sheer lack of resolution calculated by the analogue input was enough to put me off for life. 10 bit analogue readings are for people that Don't know there are millivolts and microvolts after the decimal place........ 🤣

Robert, in you code example you store e.g. 0.0000018125 in a float variable. If i'm not mistaking, in C a float is a single precision float i.e. 32 bit float. That has a precision of only 6 to 9 digits so you might loose a bit of accuracy. Using a double might be better there or else just store multiplier as mV instead of V.

Helpful video. I liked it

It's very informative, thank you

Hi. Just found out your channel. It is just amazing. Hope it goes well and more people will find it too :) Great job and keep it up. I am new to this and got one question. If I have inputs from a sensor +/- 2V max and wanting to use the differential inputs, can I set A1 to GND and A0 to the output from the sensor or need to offset it by 2V and set A1 to 2V so both are positive and the difference is the actual value? Additionally, if I use 860 SPS for that range of values (with gain set 2 so the max is +/- 2.048), is it worth using an antialiasing filter with corner frequency set to around 350 or 400 Hz? Afaik, it should be a bit less than half of the sampling frequency. Will measure breating pressure so there is no need of huge frequencies if it gives any background. Any help with these two topics will be really appreciated.

Hi Robert, i hope you are safe and well! I watched this video and it was very informative, thank you for this! I am doing a project on my on with a raspberry pi and i am having some problems to make the RPi read the i2c bus... During my throubleshooting i notice the outputs SDA and SCL of the ADS1115 are at 0V, is this right? I think the problems are with the ADS but i already bought 2 of them from different manufacturers (I am from Brazil and couldnt find the adafruit ones) and the results are the same... Could you offer some light to my problem? Thanks!! Keep up the great work :)

I want to get advise about something from you. I am using Ads1115 16 bit module with Atmega 128 processor.. There is an incompatibility in the integrations on Ads1115.. For example, 07,92,97 ones run unstable, 84,95,93 runs more stable.. It distorts the signal sound more. What is the reason for this or how can we find a solution? How can we stabilize unstable types?

Great video Robert. Would you think the ADS1115 ok to measure the -75mv to +75mv swing of a typical current shunt resistor safely using the Gain16 and differential mode? Would the anti-parallel diodes be useful here as well?

I get two digits after the dot in differential mode, why?can we ask how many digits we want? It's the number 10 you used in the ads function? Great review!

very nice viedo dude!

How do I connect something to the adc tho? How would I connect an electric guitar if it only has one input?

I have a question, if I set gain sixteen and put 1V into A0 pin, then will it destroy the module or not. If not, will I obtain the maximum value of analogRead when refer to A0 pin ?

I'm really new to this so I don't know when I'm doing something stupid. I'm currently measuring a Voltage of an induction Coil that only produces about -10 mV to 10 mV (as long as I don't accidently touch it) and my ADS1115 seems to measure it fine. Am I damaging my ADS or is this okay?

3:00 are Ferrite beads not poly fuse.

Hello, Could I use an Arduino Pro Micro (10bit resolution) with the ADS1115 (16bit resolution) to build a joystick (with better sensivity) that uses some hall effect sensors with magnets ? Thank you !

Hello Mr. Robert, please can you show me how can i measure Voltage. I have one Source +-12V and a 10kOhm Potentiometer. I would like to measure and display this Voltage Range ( +12V 0V -12V) on a Display.

it's not a 16 bit adc it's a 15 bit adc. I don't need sign bit. how could I use 16 bits? get value from 0 ~ 65535

Using 3 pcs of ADS1015 modules in one project. Good day! How can I use Adafruit_ADS1X15.h to enable modules ADS1015 with addresses 0x49 0x48 and 0x4A? How can I set the address in Adafruit_ADS1X15.h for each module ? I have already set the necessary addresses with a jumper on each module . Many thanks, have a nice day!

Thx