Tagged Questions
6
votes
2answers
419 views
Arduino has an input value in disconnected pin
I'm new to arduino. Maybe is an elemental question...
If I load this program:
...
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 ...
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 ...
4
votes
4answers
559 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 ...
3
votes
2answers
128 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 ...
3
votes
1answer
700 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?
...
3
votes
3answers
170 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 ...
3
votes
3answers
87 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
1answer
439 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
359 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. ...
2
votes
1answer
85 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 ...
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
614 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 ...
1
vote
2answers
193 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 ...
