Questions tagged [adc]

An ADC is an Analog to Digital Converter. This device converts analog signals into digital form. It is mainly used by the digital circuitry to take analog measurements.

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Synchronizing 2 MCU's ADCs over WiFi

I have 2 devices with analog signals. I want to acquire their signal with 2 MCU's (preferably ARM). fully synchronized with the same sampling frequencies, starting and ending simultaneously user ...
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STM32 HAL_ADC_Start() ends with HAL_ERROR

I'm new to microcontroller programming and I have a problem I can't solve. I am using STM32 Nucleo board L4R5ZI and I try to read the analog value on one of the pins, and then use the ADC to convert ...
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ATMEGA128 & AD7417 Reading first channel using external reference voltage

I'm doing test work in Proteus ISIS. Where in circuit used External ADC, but there is no modeling module in the proteus. And i can't test it. This ADC using TWI(I2C) interface. ADC connection circuit: ...
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PIC MCU: Reliably Capture and Measure Drum Transients with ADC

I'm seeking advice to help my circuit/code/mcu work more reliably and accurately. What I've got right now is almost there, but I'm just missing the know-how to get me consistent readings. I've tried ...
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32 views

Measuring 4-20mA with differential ADC

I have a question. Is it a good way to measuring 4-20mA with differential ADC? Assume that we have a ADC with 2 single ended inputs or 1 differential input. Input A+ is the first input and input A- is ...
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i have two questions about value of adc being changed

I want to acquire the values movement of two strain gauges attached to dc motor For example, first strain gauge has values around 10000, the second has 20500 in 0 degree while the first is 10400, the ...
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50 views

Calculating Phase angle from instantaneous voltage

For background info I am an EE/CE that is 10 years out of school and has since worked writing firmware and dealt mostly with digital communications and signals, so now I am having to reach back to my (...
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55 views

using mcp3008I/P adc with raspberrypi

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66 views

Transient Response of AC Coupled Inverting Amplifier

The circuit below is from this App Note. The document describes: The capacitors C1 and C2 need to fully charge for the circuit to function properly. The definition of fully charged can vary depending ...
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38 views

ADC Input Protection with 4-20mA

If you've got a 4-20mA transducer, powered by 14V, and you want to measure it, your analog front end might look something like this: simulate this circuit – Schematic created using CircuitLab .....
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Ambiguity in ADC conversion of analog voltage to digital value

I have question about the common formula used to turn analog input voltage of ADC into an integer binary number that is as bellow : I think that in the equation above N is not integer but floating-...
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74 views

STM32F429ZI ADC converting too fast

I am trying to trigger ADC1 to convert (for the moment) one channel of a STM32F429ZI microcontroller (on the Nucleo Board) by TIM2 every second. With the code below I configured 180 MHz core frequency,...
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46 views

Audio ADC - grounding problem

I searched through the internet but couldn't find an answer to my question. Maybe I just don't know what to search for. I want to convert an audio signal coming from a stage box from analog to digital....
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61 views

Fluctuating ADC results - is it normal and characterized in a datasheet?

As I have been reading [1], there exist four different DAC error types, which contribute to the overall error: Offset Error Gain Error INL Error DNL Error Is my understanding correct, that these are ...
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1answer
67 views

Does dividing a clock increase its jitter?

I want to have my microcontroller and ADC using a clock derived from the same source in an effort to avoid intermodulation effects. All clocks are under 50 MHz. The maximum SNR out of an ADC is ...
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82 views

STM32F051 ADC DMA overrun

I am trying to use ADC with 2 channels and DMA, but I only get 1 reading before the overrun bit gets set. Also the 1 reading is wrong, I am expecting a value of approx 2100, but I am getting around 70....
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Trying to interface with intercom / door phone system (Read 15 times)

I have a project idea where I want to interface with my intercom / door phone system. Its a proprietary system developed by SSS Siedle, and there is next to no documentation or research on how these ...
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76 views

RMS calculation in cheap microcontroller

I normally see that RMS calculation is done using some kind of DSP or more high end microcontroller. I'm using this microcontroller and I would like to know if it could do RMS. I need to read 60 Hz ...
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How to increase polling speed of data from external ADC (controller and ADC has SPI interface) without any external interrupt?

I have an an external ADC which has capability to sample data at 40Ksps and controller needs to poll the data from ADC. I am unable to get enough sampling rate by keepon calling it from while(1) loop (...
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47 views

Protecting an ADC from negative voltage: Is it better use diodes OR to offset voltage?

I'm working on a simple guitar amplifier and reader with Arduino. The Arduino will use this input to find the amplitude and frequency of the input signal. I'm getting confused about how the ADC ...
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47 views

Which switch/amplification method described is better for accurate reading of variable voltage using ADC?

I'm trying to design a relatively accurate variable power supply with 2~24V output voltage controlled from an MCU using off-the-shelf parts. For the MCU to be able to read the whole range of voltage,...
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62 views

Analog values without Adc STM32 [duplicate]

I have a STM32WB55CGU6 where I have all my ADC pins used up and im trying to obtain the battery level using a pin which does not have a ADC (PB6) which is branched as shown in the picture: This ...
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134 views

STM32: Why can't I use scan mode in interrupt-driven ADC?

I'm using an STM32F103C8 to read 3 ADC channels, and have used CubeMX + HAL to configure the ADC to shuttle the ADC values into a buffer. I've been able to accomplish this with DMA and polling: I've ...
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155 views

Analog values without adc

I have a voltage divisor to measure the voltage of my battery which serves as a battery level detector and it is connected to a GPIO pin in a microcontroller which does not have an ADC. Is it possible ...
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45 views

Maximum series resistor value you can place on an ADC with and without a buffer

I would like to know what would be the maximum series protection resistor i can place on an ADC with a buffer AND without a buffer. I know that with a buffer you can go up to the hundred kilo-ohm ...
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Crosstalk/Ghosting on ADC input

I have an ADC circuit which uses AD7689. The inputs of the ADC are driven by LT6010 opamp, and have a low pass filter . All 8 channels of the ADC (AD7689) have the same driving circuit. Every other ...
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39 views

ADC and DAC center frequency upper limit

I have some RFSoc Evaluation Kit with 12-bit DACs and ADCs that support nearly 4 GSPS I found out that sampling rate is related to bandwidth. From experiment, I found out that this board's DAC and ...
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69 views

Interfacing AD7321 ADC with Arduino using SPI

I'm trying to interface an AD7321 ADC with the Arduino Uno/Mega or Raspberry Pi for data acquisition of signals from my breadboard to computer. I am able to communicate with the ADC through SPI with ...
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41 views

Current Monitoring circuit setup and option exploration for IoT device testing

I would like to use the ADA4528 opamp or similar opamp to monitor current consumption across a sense resistor for an IoT device but with a Caveat. I want to measure the entire range with one setup/...
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48 views

ADC IC I2C problem

I'm trying to run ads7924 using stm32f series. But i2c does not work so I check the i2c line. Between 0R, MCU side 3.3V but ads7924 side 0V. I set pull up setting of MCU internally . What is the ...
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89 views

Can I “sum” internal ADC channels to achieve extra bits resolution?

First of all I am a newbie in electronics. I am building some weight scale applications using (as seen everywhere) load cells wired to a HX711 ADC and a ESP8266. I am now giving a try to the Texas ...
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21 views

Is it possible to replace the ref pin of AD620A with a fixed voltage?

I am trying to implement the below circuit (from) without ADuC842, I will use Arduino mega2560 ADC. the circuit generates -5V to 5V rail to rail voltages for ad620a and they control ref voltage via ...
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SARS ADCs where BW >> SPS or SPS >> BW

I was looking at two ADCs, the ADS8568 and AD7606B and came by a rather curious design decision for both. ADS8568 AD7606B 800ksps per channel There's quite a mismatch between the sample rate and ...
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Matlab and pic integration

i' m working in an exercise of integrating between pic16f877a and Matlab GUI. Although spending much time searching, i still have not found out how to display ADC value on a GUI panel. Hope you could ...
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24-bit auxiliary sensor interfaced with ICM-20948 IMU

I am trying to interface the ICM-20948 IMU (https://invensense.tdk.com/products/motion-tracking/9-axis/icm-20948/) with the ADS122C04 ADC (https://www.ti.com/product/ADS122C04). To collect data, my ...
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101 views

Gain on an ADS1115 using differential input

I'm using an ADS1115 hooked up to a Raspberry Pi to detect a differential voltage of about 0.5V. VDD is connected to the Pi's 3.3V, GND to Pi Ground, SCL and SDA to their corresponding Pi pins. I then ...
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What does a High Impedance input mean for an ADC

The ADC ADS131M08 list a feature: Can someone elaborate what this feature implies? Does this mean i can place a 300 Kohm resistor in series with the inputs? There is even a reference on page 88 with ...
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47 views

Power rail noise calculation

I am attempting to calculate the noise on the power rail that my ADC is receiving so I can calculate my effective number of bits. But the different units on the datasheets of the regulators are ...
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76 views

STM32 - Fastest way to change ADC channels after each conversion

I'm using the STSPIN32F0 (edit: I'm using the STPIN32F0 6-step control evaluation board from ST called STEVAL-SPIN3202) to develop a 6-step speed controller for brushless DC motors. The STSPIN has an ...
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64 views

Steering wheel controls with zener diode?

I am looking at my steering wheel schematics and trying to find what are these zener diode doing there? I want to be sure there's no problem feeding 5V from an Arduino to check the ADC values without ...
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83 views

Applied 370degC at the input of an ADC in a Microcontroller

I am using this Microcontroller - 100 pin I have configured pin 82 as an ADC input. ADC Reference voltage is 5V (provided from an LDO whose input voltage is 12V) To test my ADC accuracy, I took a ...
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70 views

A general purpose way to connect cellphone line out to a microcontroller ADC

I have looked at many questions with similar titles but cone cover my query. Question: How can I protect an STM32 Cortex M4 series ADC input when measuring the AUX output voltage from typical ...
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56 views

ΔΣ ADC Programmable Gain Without Amplifier

There are some ΔΣ ADCs of which one can set an input referred gain. Like if there was a PGA between the input and the ADC, but in fact, there seems to be no PGA between the ADC and the inputs but ...
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76 views

ADC eliminating noise for improved accuracy

I am working on a 24 bit ADC and would like to eliminate noise as much as possible in order to maximize the performance of the 24 bit ADC. There are two main areas where I am concerned where noise ...
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1answer
36 views

Hall-Effect Current Sensor Output Voltage Difference (26.4 mV/A)

I am using a hall effect current sensor. Its part number is ACS781LLRTR-050B-T from Allegro MicroSystems. In my circuit, I'm reading its output voltage to calculate current with MCU. With no load, I ...
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24 views

Quantization Noise Power

[Marcel Pelgrom, Analog-to-Digital Conversion] Hi, I'm a bit confused on how the author here derives the quantization power from the sawtooth wave. How exactly is he integrating using values from ...
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68 views

1V on ADC pin with DMA continuous requests

I have a STM32G071 Nucleo Board and also the IC itself. In CubeIDE, I set a pin as ADC and activate DMA and enable the DMA continuous request in the ADC settings. After executing the code and ...
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21 views

How to know if battery is charging?

There is a Heltec's wifi kit 32, that is based on esp32 controller with a battery attached. I want to write a script to know if the device is plugged in to a PC or a charger. Script provided here by ...
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41 views

Oversampling, additional bits and a thermistor

Say we have a ten bit ADC (MSP430G2433) and a thermistor. We have the problem that two temperature measurements are too far apart, whilst the temperature has barely changed. So, we take more ...
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77 views

Vref value and Vref shunt ICs for an ADC

Hello i am building an ADC circuit, this is my first time building a proper adc that is higher performance. The adc is the ADS131 The ADC will be powered by an isolated 3.3v and I would like to know ...

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