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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51 views

Wrong voltage in op amp circuit to adc

my circuit is not giving me the expected voltage. This is used to measure the current flowing trought the shunt. For example: if I expect 1.3, I get about 1,15V out. Anyone knows what I did wrong? ...
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2answers
48 views

I need to sample 8 audio sources at audio quality, what MCU can I use? [on hold]

I need to sample 8 audio sources at the same time, at a decent frequency (say, 40Khz). Being only familiar with Arduino, I searched online for tutorials and articles about using interfacing it with ...
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12 views

atmega32 piezo detect knock

I am trying to hookup a piezo sensor to an atmega32 and detect a knock. From the following website I took the example for the connection: https://www.arduino.cc/en/tutorial/knock Except I am not ...
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3answers
52 views

How to measure H-Bridge motor voltage using ADC

I am controlling two motors using a double H-bridge controller. I would like to measure the voltage at each motor using ADC's on the microcontroller. The problem is that the motor voltage may be ...
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29 views

Switch Mode power supply and ADC measurements

I've got a controller, measuring on 4 channels, but I see the (~50mVpp)ripple of the power supply, when I oszilloscope the ADC pin. The adc values jump around too. I tried to add an LC filter, but it ...
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1answer
34 views

Choosing ADC with wide input voltage range (0-10V)

I faced with the task to measure several inputs (0-10V analog) with galvanic isolation. Using plain Google search (like '0-10V adc') I found several solutions like Linear Technology LTC1854/55/56 ...
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16 views

Connecting a load cell to TIVA C Launchpad

I have a typical 4-wire wheatstone bridge type load-cell. 2 of the 4 wires are for excitation called E+ and E-, while the other two wires are for sensing S+ and S-. The load cells are generally ...
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1answer
25 views

Negative input voltage on Isolated Differential ADC

I am trying to interface with negative voltage input signal ranging from -5V~5V or -10V ~ 10V. Since the input signal may be floating or have ground reference, I am planning on galvanically isolating ...
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2answers
42 views

Why does this work for biasing an AC signal for A/D conversion

I have a working circuit for biasing the AC signal going into my ADC, but I cant quite wrap my head around why it works. I can see that it resembles a high pass filter but how/why does it add the two ...
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47 views

How to remove noise from the output of inverter circuit created from 741 IC [closed]

I'm trying to provide a negative input to ADC0804 through an inverter circuit. The inverter circuit is made using IC 741. But, the inverter circuit is giving a lot of noise. Is there any way to ...
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32 views

interfacing current transformer with ADC (ANALOG to digital converter) to show the line current on seven segment [closed]

i am working on a circuit to to display the motor line current through digital ammeter using 8051 microcontroller and seven segment display instead of general analog ammeters.please help me in this ...
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20 views

Interfacing a differential thermocouple pair with ADC

I have a differential thermocouple pair (two K-type thermocouples connected by a common leg) from which I need to sense very small temperature changes between the two thermocouples. Because one ...
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2answers
45 views

would using the reference voltage of an ADC as a VOLTAGE SOURCE affect my ADC or the stability of the circuit?

I am using an Arduino to capture an AC signal. However, the application is sensitive and needs a high resolution, I decided to use the internal 1.1 Volt as a voltage reference for the ADC. In the ...
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0answers
34 views

Conditioning negative ADC voltage with separate AGND and DGND

I was looking to condition a negative voltage analog input for an ADC and I saw these two posts describing a voltage divider circuit to do so. How do I sample a -2 V to +2 V analog signal with a PIC ...
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1answer
60 views

Phase Sequencer

I have 3 phase voltages entering into my PIC ADC (3 different channels ) through a voltage down scaling circuit and I have successfully calculated their rms values inside my controller.Know I want to ...
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1answer
35 views

Effects of restricting most significant bits

So i have calculated the settling time for the capacitor C in an RC circuit. The RC circuit is the result of connecting an ADC with a mutiplexer. The ADC is a 12-bit type. In the assignment ...
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0answers
59 views

why my DAQ signal is a noisy signal?

background: My goal is to use an Arduino with two proximity probe (sensors) to achieve some output. It is worth mentioning that the output of the proximity probe has two components: DC output that ...
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1answer
57 views

Find settling time of ADC

In an assignment, I need to find the settling Time of the ADC Input Circuit time to reach 1/4 of the LSB. The ADC has 12 bits. I also know that C=12 pF and R=10 kohm. I found a formula that i used ...
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1answer
22 views

ADS8361 and F28335

I'm trying to interface an ADS8361 with an F28335. It looks like I have some timing issues when reading the data using the McBSP. I tried to follow the code and the schematics included in this ...
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1answer
43 views

Voltmeter scaling resistor front-end and ADC calibration coefficients

I'm designing a voltmeter and current measurement system that forms part of a electronic load. Lets tackle the volt meter first. I'm using a 16-BIT ADC (AD7708) and want to measure the following ...
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1answer
34 views

Need help to calculate time in an RC circuit with a AD converter and a multiplexer!

I am not sure how to describe this in english, but i will give it a try. I have a unipolar AD converter with Vref=3.3 V and 12 bits. The digital output is d=969 so that gives me the Vin=780.879 mV. ...
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1answer
107 views

Measuring an analogue voltage with isolated ground

I am working with a solar EV (car), and I need to measure the throttle pedal signal. The throttle peddle is essentially a 10k ohm pot between 5v and gnd on the motor controller. (0-5V signal). As ...
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1answer
49 views

ADC samples half frequency

I'm using a dsPIC33F (Microchip) to sample a 555-timer signal. I've tried square, triangular, and "sinusoidal" signal shapes, but always have the same problem: the ADC samples the waveform correctly, ...
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1answer
24 views

ATtiny861A: ADC reference voltage should be 1 Volt under AVcc?

I just faced with that ATtiny861A datasheet forcing me to use analog reference voltage to be at least 1 Volt under analog supply voltage: Let me doubt this datasheet statement for two reasons: ...
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1answer
38 views

Interfacing ADC with MCU using SCI

I am trying to interface a Texas Instruments (TI) 16-bit ADC to a TI Piccolo microcontroller (MCU) via a serial communication interface (SCI). The ADC block diagram shows 3 connections for this; a ...
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45 views

How to properly measure voltage of external supply

What is the proper way to measure an external supply like a 9V battery which is not connected to the controlling part (micro-controller) of the system. Take an external 1-Channel SAR ADC with SPI ...
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0answers
39 views

ADC_Read function customized not working

I'm Writing code in C to read ADC voltage for dsPIC30F4013. It is 16-bit Micro-controller. I have initialized all the ADC related control registers and checked my code's working up to acquisition of ...
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3answers
104 views

calculate battery voltage using pic ADC

I need to calculate battery voltage using my PIC's ADC. My battery voltage is 24V and ADC has a 12 bit resolution, the PIC operating voltage is 3.3V. I am using the PIC's internal Vref+ and Vref- ...
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3answers
121 views

8 bit MCU with 12 bit ADC, possible?

I am trying to measure battery's voltage and current but with a very high accuracy. So i've selected a 12 bit ADC to be interfaced (via I2C) with my micro-controller. My micro-controller will receive ...
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2answers
78 views

A/D conversion loop infinitly

I'm quit new one PIC microcontroller, and i'm stuck with a new problem. I was using the A/D converter of my PIC18F46j50 to catch 4 push buttons on 1 PIN (RB2), and it worked well. But since I ...
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1answer
63 views

How to figure out how much time you have for writing to flash when voltage source breaks down?

I try to figure out how I can make sure, that my controller (STM32F030K6) is always able to save a 16 bit integer to the flash when the power is breaking down rapidly. This controller has an Analog ...
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2answers
122 views

Need to convert 0-10VAC (alternating current) to 0-3.3VDC (direct current)

I am using a sensor that outputs a 0-10 VAC (alternating current) and I need to convert this signal into a signal within 0-3.3VDC (direct current) to feed into an ADC. What is the best way to go ...
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43 views

Design issues with an integrating ADC

I have designed a dual slope integrating ADC on Multisim, but I am having some practical limitations. To switch between the input voltage and the reference voltage, I am using the following switching ...
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2answers
85 views

Interfacing ADC CS5532

I've been trying to interface ADC CS5532 to P89V51RD2. I have reset the ADC, written configuration bits to the configuration registers. I am trying to use the single conversion mode. However, while ...
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1answer
61 views

How to make Current to Voltage converter [duplicate]

I am working on level sensor which give output of 4-20 mA. I have to feed output of level sensor to an ADC of a micro-controller, to do so I have to convert it from current to voltage.Voltage range ...
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2answers
62 views

How can I collect data from a hydrophone?

I want to collect data from a hydrophone over a period of days or weeks. Hydrophones are a piezo-electric transducer that output millivolts (thousandths of a volt). A response from a hydrophone might ...
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3answers
309 views

Voltage and current measurement of battery Single ended or differential?

I am trying to measure battery's current and voltage for a battery charging/monitoring project. I have read all about current sensing (including high side & low side sensing). And i have decided ...
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59 views

Reference Voltage of ADC - Renesas

Can I connect negative reference Pin of the ADC present in MCU to a potential of 1 or 2 V? I am looking for this because I have a input signal which only drops by 200 to 300 mV max from 3 V. Hence, ...
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33 views

Low Pass filtering in Delta Sigma modulation

I was reading about delta sigma modulators. I read that to make the data more accurate it performs digital low pass filtering on the quantized data. So like, if we have a one bit quantizer which is ...
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3answers
232 views

Arduino Uno reading analog 24v DC signal

Disclaimer: Please be gentle - I'm a newbie with electronics. Overview I have a proprietary 24v DC analog sensor signal that I'm trying to interface with using a Arduino based microcontroller. The ...
2
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1answer
65 views

Reading and processing 32+ ADC channels at high frequencies

For a project I need to sample 32 or more photoresistors at a time and return an ID and value of the brightest photoresistor over some communication (i2c, serial, etc doesn't really matter to me). I ...
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1answer
52 views

DAC interfacing with Atmega128

Hope you are doing well and solving all your problems!!! I am new to hardware programming, facing some difficulties to work with DAC interfacing with Atmega128 board. After searching on internet, ...
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1answer
47 views

AT90USB VCC & GND PINs(Where to where?

Where do I connect these pins?so many wayz in google.Im using P? for programmer pinboxheader and J? is USB porb to send ADC data to PC ...
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1answer
48 views

ADC neglects input voltage (ATMega32)

In the following AVR code, why do I always see the same voltage for all pins of port A? I am using ATMega32. BTW, when I am grounding some pins of port A I do not see any change in the output. It ...
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2answers
90 views

How to smooth analog data?

I am trying to read load cells data, but these values are very fluctuating. I have ADS1230 ADC and I had configured it to the internal gain of 128. Four half-bridge load cells are connected in a ...
6
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1answer
114 views

Why do I have crosstalk in Arduino ADC, despite low source impedance?

I. THE CIRCUIT: Below, an Arduino Due measures voltage signals from two parallel voltage-divider circuits: We want the Due to accurately measure the voltages at the places where it makes contact ...
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39 views

Testing an A-D converter of an ARM microcontroller

all. I am playing around with a development board that is using an ARM microcontroller and was wondering what would be a short and simple way of testing the A-D converter of the microcontroller. I am ...
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2answers
47 views

Four Half Bridge Load Sensors outputs highly fluctuating values

I have four half bridge strain gauge load sensors connected in a wheat-stone bridge configuration. I have fed the output of the sensors to the ADC (ADS1230) which is a 20 bit analog to digital ...
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1answer
57 views

Is there any relation of ADC's conversion rate with its current/power requirement?

I'm working on a ADC-AD9266 which gives output at a reference of Data Clock Output (DCO) whose frequency is same as that of ADC conversion rate which also the frequency of Clock. f(clock) = f(DCO) = ...
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2answers
81 views

DC motor as rotational speed sensor?

Will spinning a small DC motor work effectively as a rotational speed sensor (by producing voltage)? I'm trying to measure the rotation of a shaft (driven by a trackball) on a shoestring budget. I ...