Tagged Questions

2
votes
2answers
97 views

Op-amp input stage for Arduino Due ADC - guitar signal

I am trying to design an op-amp input stage to capture a guitar through an ADC, specifically the ADC on an Arduino Due (3.3V, 12 bit). I am aware there are numerous ways to configure and bias the ...
0
votes
1answer
74 views

Interference beetween ADC samples with XBee and photoresistor

I'm using an XBee serie 2 module for sampling the values of three sensors, a photoresistor (LDR) a moisture sensor and a temperature sensor (LM35). When there is no brightness the photoresistor has ...
3
votes
3answers
107 views

Arduino Nano: measuring tiny voltages with analogue input

I need to measure 0v to 40mV as accurately as possible with the 10 bit ADC on the Nano. I only need approximately 1 sample per second. I plan to hold the AREF pin at 40mV above ground, properly ...
3
votes
2answers
180 views

Measuring an Arduino's power source voltage using Analog In

I am powering an Arduino using a 5v battery, and I need to measure the voltage. Let's say the battery delivers high current, is it safe to measure the voltage via Analog In? As in this: The reason ...
2
votes
1answer
95 views

Arduino Pro Micro: how to access A1

I have an Arduino ProMicro 5V 16MHz board from sparkfun. I have a 3Cell LiPo powering the entire thing (via the relevant regulator bringing it down to 5V). This is part of a TriCopter. I tap the 12V ...
3
votes
3answers
178 views

Arduino sampling accelerometer

I have an analog accelerometer I want to sample at 100HZ, I also want to plot the data with time of each sample so I have acceleration over time. To keep track of time I was going to use millis(). To ...
1
vote
2answers
203 views

detect a change in state of voltage divider without using ADC

I am using a photoresistor for a laser trip wire setup to detect motion. I am a little short of adc channels here so would like to use a simple GPIO to read the state of the photoresistor ckt. I am ...
1
vote
1answer
401 views

How to read values from a NO2 sensor from an Arduino?

Alphasense sells this NO2 sensor: http://www.alphasense.com/environmental-sensors/alphasense_downloads.html http://www.alphasense.com/environmental-sensors/pdf/NO2B4.pdf How can I read the values ...
1
vote
3answers
2k views

Sending audio over ethernet

I am trying to send audio from a microphone such as this over Ethernet to a computer. My first idea was to connect the mic to an arduino's ADC and send the data using an ethernet module such as the ...
0
votes
2answers
573 views

Voltage limitations on AREF for Arduino

The default for the Arduino A/D capability is a 5v reference. Given the 10-bit A/D converter, this is 4.88mV per number from 0 to 1023. The Arduino also supports setting the analog reference voltage ...
1
vote
1answer
131 views

10-bit digital representation with SPDT switches and voltage division

I'm completely new to electronics, and have been trying to come up with a way to connect 10 SPDT switches to a single analog pin on my Ardiono Mega 2560 (and off course connected to 5V and Ground). ...
6
votes
2answers
444 views

Arduino has an input value in disconnected pin

I'm new to arduino. Maybe is an elemental question... If I load this program: ...
3
votes
1answer
457 views

Drift and “flipping” in Instrumentation Amplifier reading thermistor

Disclaimer: I only have about 2-3 months of semi-intensive electronics experience. Note that the chip (to the left of the Arduino, is Analog Digital's AD623 Instrumentation Amplifier) Datasheet ...
2
votes
2answers
1k views

Measuring tiny voltage variation with Arduino ADC handing the rapid changes in control algo

I'm hoping I can get some advice, I have an industrial laser position sensor from SICK that outputs 0 to 10 volts. I used a voltage divider to scale it down to 0 to 5 volt range, and feeding that into ...
2
votes
1answer
367 views

Arduino ADC behaving oddly

I'm getting somewhat strange behavior from the ADC on my arduino, I will try my best to explain. I made a microphone amplifier circuit that gives a peak-to-peak of 0 to 5 V with a DC offset of 2.5 V. ...
4
votes
4answers
598 views

Set up an array of pressure sensors

I am working with a flexiforce pressure sensor 25 lb. I have to run 6 of them in parallel and I'm using an Arduino Uno. I'm not an electrical engineer (read: I'm a computer science major) and this is ...
2
votes
2answers
2k views

Does the arduino (ATMEGA328P) ADC really only sample periodically?

I have been experimenting with the Arduino's ADC, and I have noticed some bizarre behaviour. I am wondering if it is normal, or if this is something specific (and bad) about the Atmel ATMEGA328P that ...
1
vote
3answers
630 views

What happens when you connect a 16bit analog device to a 10bit adc

Can someone explain what happens when you hook up a 16bit analog device to a 10bit ADC (like the one on the Arduino).Will it still function?Will the 10bit ADC normalize the values with a lower ...
5
votes
3answers
7k views

How to make a clean amplified microphone analog to digital conversion?

I've asked a couple of questions relating to this project the past couple of days, but I cant seem to put it all together. I hooked up an electret mic into an opamp and gave output to my arduino ...
3
votes
1answer
705 views

What is the voltage range on an Arduino pin when doing analogRead()?

I know what an Arduino's ADC generates a number with 10 bits of resolution (0 to 1023). How is this number generated? Is there a minimum and maximum voltage it will assign 0 and 1023 to, respectively? ...
4
votes
3answers
3k views

How to read an audio signal using ATMega328?

I was trying to use the ATMega328 ADC port A0 to read a signal. The hardware I used was: Seeeduino Stalker Electronic Brick Shield Microphone Electronic Brick (I found a link to the original ...