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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Why does this seem like a strange way of connecting a bridge circuit to the ADC?

I was planning to hook up a quarter bridge circuit to the AD7730LBR Analogue to Digital Converter that I bought. I was having a look at a "Load_Cell_Schematic" provided by this webpage (the download ...
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35 views

USB device to measures mains voltage [on hold]

I'm looking for a usb device that I can connect to an outlet and measure the voltage. It doesn't have to have a high sample rate, once a second would be great. Resolution only needs to be about a ...
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2answers
31 views

Using DAC to create reference in a wheatstone bridge for strain gauge?

I am designing a circuit where a microcontroller can measure the load forced upon a load cell with strain gauges, making a half bridge. A traditional Wheatstone bridge looks like this: Resistors ...
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10 views

Calculating the actual ECG Voltage from ADC values in the SHIELD-EKG-EMG by Olimex

I'm using this shield with my arduino to acquire ECG signals https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/. I am able to get the waveform in a processing software. Now my problem is ...
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19 views

turn on led using external light dependent resistor (LDR) with nios ii and qsys design

I want to use qsys and nios ii to design a system that uses an external ldr to turn on led on an altera fpga.how can i go about this, what are the components i need in my qsys design and how to ...
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1answer
21 views

Why is a Buffer+RC-combination recommended for driving a SAR ADC analog input?

In various places, e.g. this tutorial video by ti, a circuit like the following is being recommended to drive the analog input of a SAR A/D converter: simulate this circuit – Schematic ...
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30 views

Analog input dependent on samples quantity used in averaging

I found this issue using arduino but IMO this relates more to electronic eng. I use pin0 without any pull-up/pull-down/connection. Simplified code: ...
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1answer
39 views

Connect ground of system A to 1v6 of system B?

I have an embedded system powered by a 3.7V LiPo battery that will be connected to an iPod's headphone out cable. The embedded system will perform some DSP on the iPod's audio out signal and use ...
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1answer
33 views

MCP3425 (ADC) problem

I am having problems with this ADC. Here is the datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22072a.pdf I connected it in Single-Ended Input, so I have 15-bits from 0v (0x0000) to ...
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1answer
54 views

HX711 amplifier

I have one of the HX711 ADC devices that I want to use for a weighing application. I've fitted it to a breadboard and used demo firmware to poll the chip for readings. The behaviour is as follows: The ...
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2answers
239 views

Using Arduino Mega With lots of strain gauges

I was looking for a strain gauge shield for an Arduino Mega. I found this link which I found really useful: http://www.osengr.org/Projects/Load-Cell-Shield/Load-Cell-Shield.html At the bottom of the ...
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1answer
100 views

Capturing data at 500MHz

I have an ADC sampling at 500MHz (It is collecting data from an Ultrasound sensor). I need to be able to stream this data to my PC (for the time being - this will be done through a wireless unit). I ...
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24 views

XMega ADC is not working

I am working with ATXMega32D4 and trying to run a ADC Code. The output of the ADC is always pushing the maximum value, incase of a 8bit resolution unsigned mode, the output value is 255. The same ...
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1answer
36 views

Calculating output voltage and current of photodiode for input towards ADC

I need to make something that reads brightness value of an LED from voltage output of photodiode. I will be using the following parts: OSRAM OSTAR LE UW E3B datasheet Summary: Forward voltage Vf ...
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2answers
38 views

Decreasing ADC Reference vs. Amplifying signal

I have a sensor interfaced to ADC but the Range I am getting is not enough, so now there are 2 options, Gain up the signal or Reduce ADC Gain. But as I heard it, reducing ADC gain will cause more ...
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32 views

Connecting an ADC to external input

I have a 12-bit resolution high speed pipelined ADC on PIC24FJ128GC010 micro-controller. It has an internal input [from an another peripheral internal to the chip]. Now, I would like to add another ...
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2answers
100 views

STM32F103RB ADC (pics included) strange values for temperature sensor (LM35)

I've connected one battery/2 batteries (GND and A0) and the measuremet displayed on the com26 port is ok. I've connected the LM35 (The LM35 has 1 celsius degree for 10mV measured value) on the VCC and ...
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1answer
32 views

What is the Effective Resolution of 7135 ADC

What is the effective resolution of Intersil 7135 based 4.5Digit ADC when we use a Microcontroller based measurement using the BUSY and STROBE Signals? datasheet Data Sheet
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1answer
75 views

Shrink ADC signal from 5V to 1V?

I have an ADC signal, how do I shrink it to 1V from a 5V sensor like Hall IC for example. Of course, a resistor divider is one method, but will it work reliably as the output is expected between 0 to ...
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5answers
107 views

Easiest way to read a large bank of LED's

I have a pretty straight forward question but every answer I come up with seems over complicated or just plain wrong. I'm designing a data logger/fault detection system to be used for a large piece ...
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2answers
56 views

How can I make a simple analog to digital converter?

I'm trying to hook up a sip-puff air pressure sensor (datasheet) which outputs 0v to 5v depending if the pressure is -ve (sipping) or +ve (puffing). I want to use it to drive a Bluetooth keyboard ...
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27 views

Problem with Operating ATmega16 in Differential ADC mode

I have used ATmega16 in differential mode by configuring ADMUX as 01001111 for (Reference Voltage at AVCC and external capacitor at ARef, Left Adjustment, ADC3 as Positive Pin, ADC2 as Negative Pin, ...
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46 views

Implementation of PSK modulation/demodulation

I want to implement a BPSK modulation/demodulation using a microcontroller (Arduino Due). The carrier signal should be at 1-50 MHz and the information rate at 300 KHz. For the sender part I would ...
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1answer
76 views

How to read signal from load cell?

I took apart a weighing scale to get the load cell from it. The weight scale was capable of measuring up to 85 pounds with 5 grams precision. The voltage drop of the weight scale, however, is too ...
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1answer
62 views

Parsing Raw ADC Data into Voltage Levels

I'm collecting single-tone test data on the ADC12J4000EVM using the TSW14J56EVM and the High Speed Data Converter (HSDC) Pro software and ADC12J4000EVM GUI. I am trying to capture raw time domain data ...
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2answers
61 views

Flash ADC with TL074 & 74LS148: encoder inputs always high?

I am attempting to build a 3-bit 0-5V flash ADC using two TL074 quad op amps and a 74LS148 active-low priority encoder. The circuit is fairly simple. 8 100K resistors are connected in series between ...
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2answers
99 views

Arduino-based oscilloscope: attenuate the input by varying reference voltage?

I don't have a proper oscilloscope. I don't have the budget to buy one, even a used one. I have to roll my own. :( The plan is to use an Arduino Leonardo or Due as a combined A/D and USB interface ...
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2answers
93 views

1 PPS Accuring Clock Signal for ADCs

I am busy with synchronize all my ADCs on data acquisiton systems. My ADCs need to clock signals for their duty. So in my opinion for synchronization, if i send to all my ADCs clock signal which is ...
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1answer
90 views

Precise measuring of frequency with high-speed ADC

Let's say I have precise "reference" clock and I want to measure frequency of some other "target" clock, as precisely (let's say ~12-15 digits) and as fast as possible. In the simplest case one ...
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4answers
90 views

Best way to measure 0-5V with uController running on 3.3V

What is best way to accurately measure 0-5V with uController running on 3.3V? It will work in environment with quite a big delta temp (from -20 °C to 80 °C). I use stm32F4 12 bit ADC. precise ...
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1answer
59 views

Calculating latency for ADC chips

I am building a realtime based audio processing system that needs to sample 48KHz, 16bit audio, preferably with <0.5ms (the lower, the better) latency (Measured from analog signal -> data sampled ...
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62 views

is there any analog voltage reading ic present? [closed]

In arduino analogRead() reads voltage from 0 to 5 v and gives 10 bit output. Is there any IC which is specialized for this function only?
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50 views

Inherent sample and hold in a comparator?

I have been reading up why a flash ADC does not (theoretically) need a sample and hold circuit. I have learned that this is because the comparators have an inherent sample and hold property, but I can ...
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2answers
93 views

ADC sampling problem using FPGA

I am trying to sample sinusoid signals using AD7928, which is a 1 MSPS ADC. It is connected to an Altera Cyclone V FPGA, and runs at 20 MHz master clock. Data rate is 1.25 MHz and that's due to the ...
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202 views

Straight from the datasheet: Is this really a sensible filter circuit?

Cirrus Logic CS42426-CQZ is an audio CODEC that I want to use in a custom USB sound card. You can download the datasheet from there. On page 61, the datasheet has a recommended circuit for each A/D ...
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1answer
112 views

Replace an Analog Pot with a digital one?

I have a Boost converter with a constant current mode that allows me power a high power led (Vf 34, 3A). I'd like to be able to control the current potentiometer on this device with an arduino. To do ...
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1answer
45 views

How to read a wider range of voltages into the SA ADC on a PSoC4?

I want to read in a larger range of voltages into the SA ADC on the PSoC4, however as stated on the data sheet for the ADC component the different modes can only allow a range of 0 to 2 - 3 V and I ...
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50 views

AVR ADC invalid conversion result

My circuit works very strange. Can you help me please? Parameters: ATMEGA32A-PU JTAG ICE3 3.3 VCC 8MHz internal osc as clock AVCC connected to VCC AREF connected to GND through 100n capacitor ...
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1answer
81 views

Precision voltage reference for load cell and ADC

I want to know what could I use to have a stable 5V excitation voltage for my load cell(wheatstone bridge) which I could also use to have a stable 5V reference voltage for my arduino adc. Would a ...
0
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1answer
77 views

Compensation of forward voltage drop of a diode - software

In my case I would like to compensate with software a voltage drop over the diode. I have diode RS2J which supplies DC/DC (50mA - 200 mA) converter at this point with resistor divider I would like to ...
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1answer
75 views

Low Pass Filter With Hall Effect and ADC Help

Background: I am using the Allegro ACS758KCB-150U hall effect based current sensor, here is the datasheet, I am using it to measure current drawn by 24V motors, between about 20A - 130A. The reason ...
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3answers
199 views

Analog preprocessing circuit (anti-alias/pre-amp) for driving ADC

Background Similarly to what Jeri Ellsworth did in her C64 Bass Guitar hack I am working on an audio-to-midi converter for my bass guitar. I am also planning to use piezo discs as sensors placed ...
2
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3answers
80 views

Fast and cheap data aquisition

I need to be able to analyse signals that are 10ns in length. It comes from a PMT (Photomultiplier tube) or an equivalent detector. We need to be able to trigger at a certain signal strength coming ...
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1answer
64 views

ADC not working

I am using a MCP3008 ADC connected to the Raspberry Pi SPI pins. MOSI → MOSI, MISO → MISO, CE0 → ~(CS), CLK → SPI_SCLK Input voltage to MCP3008 is 3.3V from the RPi. Vref also ...
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2answers
75 views

what do you connect to IN+ and IN- for ADC differential input configuration?

I was trying to understand how to read analog inputs on a raspberry pi. I found this video post and I think I understood how it works. https://www.youtube.com/watch?v=oW0mTwFck_c This video uses a ...
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3answers
48 views

inverted input for adc

I am using ADC122S625 (Datasheet: http://www.ti.com/lit/ds/symlink/adc122s625.pdf). The ADC has a differential input per channel. My signal is from a RF devide with 3V peak to peak and 1.5V DC ...
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39 views

LPC ADC Freezing on manual conversion

I'm using MDK-ARM V5.10 with an ARM Cortex-M0+ LPC1114 from NXP. I have this code below to read the ADC module: ...
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3answers
418 views

Use Cases for an External ADC

Most Microcontrollers (uC) have an Analog to Digital Converter (ADC) as part of their peripheral set, which is phenomenal as this integrates two components into a single package. These ADCs are ...
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1answer
78 views

Earth alternative

I'm designing an industrial machine which is AC motor derived. There are sensitive analog sensors (e.g. Load cell) in the system and in the user's site, Unfortunately earth connection is not ...
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1answer
37 views

Compute analog signals as functions of two signals

I would like to hear your opinion with respect to the following architecture for a supposedly easy task. I need to “compute” the value of two voltages depending on two signals. Details: I need to ...