i am doing a project where i need to measure the output from an op-amp very accurately. i only need one channel. it will be in the mV range. looking online i found these candidates: 24-bit ltc2400 16-bit ads1115 (4 channel) 24-bit ads1254 i'm looking for the best thats arduino comatable with ei…

A thing to consider is to look at the spec sheets of the ADC's. That the ADC may be 24 bits how many bits does the ADC send to the Arduino and will you be using a UNO, an 8 bit machine?

Idahowalker: will you be using a UNO, an 8 bit machine? How is that relavent?

thanks! ill answer some questions @idahowalker yes, it will be 8-bit.i considered the stm32 "bluepill" chip, but i think ill stick to the atmega 328p. adc doesnt care about the arduinos limitations speed wise (to a point). @railroader this device is powered by a 3.7v lipo battery. could i use som…

Measuring voltages from 0 to 600 mV doesn't call for any extrodinary ADC. The 10 bit ADC in an UNO provides 512 levels. The voltage powering the controller is not important. I have no knowledge about those components and I don't spend time on Googling.

What resolution and sample frequency are required? Are you confusing resolution and accuracy?

@PaulRB Are you confusing resolution and accuracy? A usual mistake made by lots of people. The cheep thermometers show decimals of degrees but are often off by 1 or even 2 degrees. A small change is probably rather correct, like an AC component but the DC level is inaccurate.

@PaulRB @railroader yes i think i am mistaking the two. so i need about 0-600mv range (0-800mv absolute peak), but need it to be as precise as a good multi-meter, if not better. i.e. resolution of 500.00mV measurement capability, with it being accurate to 500.0mV or better. i hope i'm explaining…

Okey. You look like having knowledge about the need of accurazy. Every project should be deloped from bottom to top. What is the bottom line requirements and what will that call for? Too often developers starts in the other end, looking for the highest sensor quality, spending lots of uneccessary m…

So you need accuracy of 100uV and resolution of 10uV? What is the application? What voltage reference and what op-amp do you plan to use to achieve this level of accuracy? How will you design your circuit to be noise-free to those levels?

best adc for arduino

Projects General Guidance

Railroader November 4, 2019, 7:00pm 2

What is the range, the span of voltage You want to measure?
Reading mV can be done by almost every ADC. One important piece is a precise reference voltage.

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best adc for arduino

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