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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1answer
58 views

How do I scale a differential signal

I am trying to automatically measure the behavior of a batch of devices in order to guarantee that the current stays in the expected range for different supply voltages. For that purpose I am using an ...
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49 views

STM8 ADC does not use the whole conversion result buffer, despite the manual saying it does

I want to use the single buffering mode of the ADC on a STM8S003. As the reference manual describes, in this mode then 8 or 10 consecutive conversions (depending on the model) are carried out on a ...
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Sensor & ADC Convertor

Could somebody help me answer this Assuming the sensor output is 12 micro volts at 1W/m^2 the voltage range is around 12 nano volts to 12 milli volts Dynamic range is the maximum resolution of the ...
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Difference between Vdd and Vref?

What is the difference between VDD and VRef in the context of ADCs?
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Interfacing MCP3302 ADC with Arduino Micro SPI Help

I am very new to hardware design and am making an optical detection circuit using a photodiode. I simply need to interface with the photodiode and save the output voltage values on Arduino IDE ...
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1answer
69 views

Understanding ADC input voltage range from its specifications

I want to use this ADC, an LTC2344-18, a quad, 18-Bit, 400ksps ADC. On page 15 you can see that the analog voltage input range can be set to +-Vrefbuf. Vrefbuf can be set to 2.5V to 5V. This would ...
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1answer
44 views

Voltage output of a sensor with 3.3V & 5V supply

I want to connect Sharp GP2Y1014AU0F Dust Sensor with an ESP32. According to the datasheet, the VCC can be from 0 to +7V (5V recommended). With Vcc = 5V, the sensor output voltage varies between 0.6 ...
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2answers
82 views

Raspberry Pi SPI fault - returning incorrect bits

I'm currently trying to interface a CS5530 ADC to a raspberry pi 4b 8g using SPI. When I attempt to communicate with the ADC I repeatly get return bits that make no sense and am running out of ideas ...
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58 views

any recommendations for which Op-amp I should use to measure voltage across a current sense resistor?

I want to implement a current sensing functionality on an MCU (STM32F103 bluepill), but in order to read voltages across the shunts, I would need a differential amplifier to eliminate noise first ...
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2answers
683 views

Where does one find the minimum voltage above the negative rail an op-amp can output in their datasheets?

I was planning on using a UA741CP (from TI) as a differential amplifier (to get a current value from a shunt resistor and then administer that value to the ADC of an MCU to avoid noise). However, I ...
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39 views

I2S: generate BCLK/WDCLK in the absence of a master device

I'm trying to understand if I can use 4 x PCM4222 ADCs (datasheet) with the ADAT generator AL1401 (datasheet). They would be working togheter using PCM audio mode, left-justified format, that both ...
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1answer
44 views

Turning on/off esp8266 using a button

I have connected the five buttons to the analog pin of esp8266 as follows: simulate this circuit – Schematic created using CircuitLab I want to power on/off esp8266 when SW1 is pressed. Also ...
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1answer
62 views

DC bias for AC measurement with an Arduino

I'm trying to make an AC and DC voltmeter with auto-ranging and auto-switch (between AC and DC.) The maximum input is 0~24VDC and -24V~24VAC. I've built a voltage divider with some optocouplers ...
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1answer
74 views

Did I calculate my force sensor resolution correctly?

I am trying to calculate the resolution of my simple force sensor system in Newton [N]. The sensor system consists of a simple voltage divider, where the voltage across the FSR is measured by an 8-bit ...
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1answer
65 views

Voltage RMS and Voltage Spectral Density from ADC Sample are Not Consistent

I have time series data from a 100 MS/s ADC, and I would like to calculate the RMS noise and the voltage spectral density (VSD), and see consistency between the two. I'm using a 16-bit ADC, and the ...
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1answer
140 views

STM32H7 ADC with DMA

I am trying to scan multiple ADC channels on my STM32H753ZI Nucleo board. I have a TIM2 running at a super slow frequency (2Hz) which triggers the ADC conversions. I have it very slow so that I can ...
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1answer
56 views

How do I find the accuracy / uncertainty of my force sensor system?

I have built a force sensor using an arduino and a self built force sensitive resistor (FSR.) The sensor system consists of a simple voltage divider, where the voltage across the FSR is measured by an ...
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3answers
101 views

Floating/open input on summing amp

I was tasked with taking a signal that could be of ±2.5 and converting it to 0-5v so it could be read by an ADC. I managed that with a non-inverting summing amp like so: It worked pretty well but I ...
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1answer
40 views

Is it possible to use two I2C interfaces with the ESP32 using micropython?

I am designing an ESP32 based board using two ADCs (ADS1110) having the same Address that communicate with I2C. For that I need two I2C interfaces. It's mentioned in the datasheet that the ESP32 has ...
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1answer
46 views

Standard approach for a split power supply ADC?

I'm currently working on a project that will incorporate an AD7124-8 ADC, which as far as I understand can accept true bipolar inputs when provided a split supply. I tried to dig around for an app ...
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3answers
817 views

Measuring high voltage with a microcontroller

My goal is to measure 19 volts and 24 volts with the internal ADC. I am using a BeagleBone Black which has 1.8V analog input pin. If I use a voltage divider I have to reduce the voltage by a factor ...
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2answers
117 views

Are breakout boards a bad idea to use with high speed/performance ICs?

I am interested in using the DAC908E to convert an FPGA DDS generated sine wave (~6 MHz) into analog form and then feed the same analog sine wave back into the FPGA through an ADC (with equal sampling ...
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2answers
103 views

What is the difference between sampling time and sampling interval and sampling rate?

I understand that ADC sampling time is the ADC clock cycles for which the sample and hold capacitor is charged up to the channel input voltage. This is a configurable parameter and its value ranges ...
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2answers
57 views

STM32 register does not change

I want to change the SDADC register while the STM32F373VBTx is running. First time, the MX_SDADC_init() set the SDADC gain. Second time, my software set the SDADC ...
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1answer
53 views

Transmitter adc value with UART

Can the adc value be sent to the computer at a sample rate of 48 kHz real time? I am using STM32F103C8 and this FTDI.
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1answer
94 views

DMA request is ony done 1 time in STM32 - Even if I have check marked it as Circular Mode

Cause for writing this question: I think I found a bug. This happens when I try to enable DMA for SDADC and Input Capture. Introduction: I'm using STM32F373VBTx processor and it working great! Except ...
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2answers
69 views

Amplifier to ADC to Raspberry PI 4 via I2C

I'm fairly new to this so any suggestion is welcome. If this is not the place to ask questions like this let me know and I will remove it. My goal: I have a small oxygen cell which generates a ...
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2answers
88 views

How to convert non-standard sample range to standard

I'm working on a project to record sound from a Raspberry Pi. I have ADC values raning from 0 to 4095. I can convert it to an audio file and hear my voice. This is my algorithm for getting sample ...
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1answer
57 views

HX711 powered directly from coin cell

Is it a good idea to use HX711 in a project (personal weight scale) that is powered directly from a coin cell (CR2032) without any external or its internal voltage regulator? I shut down the whole ...
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1answer
47 views

Parallel load cells on a same current source

I need to read 4 load cells with relatively low resolution (12 bit is OK) and frequency (10 SPS is sufficient). The prototype used 2 ubiquitous HX711 breakouts with each powering two load cells in ...
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1answer
30 views

What does ADC SOC(start-of- conversion) in TI c2000 tms320f2802x devices mean?

I'm using TI C2000 f28027. In reference manual it's mentioned that this ADC is not sequencer based. Instead, it is SOC(start of conversion)based. What does that mean? Can anyone explain difference ...
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1answer
54 views

What is the input impedance of the ADC the SAMD21 on the Arduino Zero?

I'm looking through the data sheet and I can't find the answer. Datasheet
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128 views

STM32 Trigger ADC by a Timer

I have a STM32F722RC and would like to trigger the ADC2 over the PWM timer TIM2. The ADC2 has a external trigger conversion source of "Timer 2 Capture Compare 2 event" and "Timer 2 ...
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0answers
40 views

Stm32f103 adc stable conversion

I am making a ntc thermometer with stm32f103c8 (by writing over registers without using state library). The code works as it is,I did the adc conversion in 7.5 cycles. I used the calibration register ...
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1answer
51 views

Analog voltage control signal: Do you need a resistor between DAC and IC?

I just wanted to ask a quick question. Mostly with the Arduino with buttons etc. you have to use a pull-up or pull-down resistor for the signal to be received correctly. How does it look like when I ...
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0answers
60 views

Problem reading analog value with ESP32-C3 (Arduino IDE)

I am trying to read analog values from multiple sensors using both the ESP32-C3 devmodule 02 and the ESP32-C3-WROOM-02 module. In both cases I use the basic Arduino analogRead example code: ...
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2answers
38 views

Choosing hardware specifications for photodetection

If I plan to use an ADC of 16-bit resolution, does this have to match with the bits of the microcontroller I use? For instance, the Arduino Micro is 8-bit which is to process digital data from the ADC....
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1answer
95 views

PIC16F18446 ADC says 12 bit but max value is 3ff which is only 10 bits? [closed]

What am I missing? For a 12 bit value I'd expect the range to be 000 to FFF, but I see 000 to 3FF. Is the doco wrong or am I misunderstanding?
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Convert flame sensor ADC value to wavelength

I am working on a fire detector project using a flame sensor. This sensor can detect IR light wavelength from 760-1100 nm using a YG1006 phototransistor. I have read that if the wavelength is bigger ...
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1answer
40 views

Calculate NTC Temprature. but witout series resistor

Hello I have NTC Connected on PCB which configure as shown in following schematics. The problem is that I can not apply Steinhart-Hart equation because there is no resistance connected in series to ...
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3answers
131 views

What does the integrator do in a Delta-Sigma converter?

This question is in reference and an extension to this earlier question: How a Delta-Sigma Modulator Works. The role of the integrator was discussed in the comment section but I'm not following at all....
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1answer
83 views

How does a half-flash ADC work?

Specifically: Why does the first 4-bit ADC output the 4 MSBs? Say an input value of 8 corresponds to an 8-bit output of 0000.1111, where 0000 is the MSBs and 1111 the LSBs. If that same input value ...
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0answers
96 views

High impedance voltage source measurement with ADC

I would like to measure voltage coming from a photodiode in open-circuit condition. The measurement is OK with classical digital voltmeter, but with an ADC internal (SAR) or external (Delta-Sigma) on ...
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2answers
46 views

Measure ATmega168PA internal temperature while using other ADC channels at 5V reference

I have a device that continuously measures the value of 3 sensors connected to 3 ADC pins and working at 5V reference, so I have two options for voltage reference selection: Connecting AREF pin to 5V ...
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2answers
129 views

Powering an op amp from a Reference voltage?

Let's say I had a low power op amp (pre-amp stage) going to an ADC (LTC2412). My question is: If I wanted a super precise, low noise, low TC drift, positive supply line could I just power the +A5V ...
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3answers
131 views

dc offset removal

I want to manipulate dc offset of a signal. By using a RC filter, I can delete the dc offset when the cap is charged but there is some problem like frequency issue and long time constant. Any circuit ...
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1answer
220 views

Can I avoid buffering an analog sensor to ADC if I don't know its output impedance?

I am designing an analog input circuit for a pressure sensor with voltage levels of 0.5-3.5VDC. The initial intended circuit for this sensor is the following: simulate this circuit – Schematic ...
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1answer
83 views

Battery Cells Voltage Measurement

I'm using LM324 Q-op amp as a differential amplifier for measuring the voltages of 19-cell battery pack in series which happens to be 1.5 volt for each and the differential amplifier gain ratio is 1:1 ...
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4answers
134 views

Measuring high voltage with isolated ground

I'm trying to measure the output voltage of a constant current LED driver that ranges from 140VDC to 170VDC. I'm using an STM32 MCU which is powered by a separate external power source to measure the ...
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3answers
139 views

How do you choose the cut off frequency of a low pass filter for analog input

I would like to read an analog input from temperature sensor or pressure sensor that measure the value from a slow process with let's say 1s of rise time. I know that using a low pass filter is a ...

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