Issue w/Analog Microphone Readings

-

please let me know if not right section


the problem: sampling audio sound reactive rgb led strip nodemcu v3. when use usb power computer, works well. if power nodemcu 7805 linear regulator (5v) vin, works fine. "silent" conditions hang around 0 volts , audio levels show clearly. when power nodemcu 3.3v switching regulator (with microphone grounded on nodemcu , vcc coming 3v3 pin) problem starts. if have led strip unconnected, detects sound find (although "silent" conditions hover more around .1 volts purposes wouldn't issue).

the problem powering board , subsequent microphone switching regulator lights connected erratic voltage readings on place. might asking why not use linear regulator then? well, @ 12 volts (12v-5v)*( few hundred ma) decent amount of heat dissipate sure heat sink , control end goal project power 10m strip 24 volts , linear regulator have dissipate (24v-5v) * (few hundred ma) not think sustainable why got switching regulator in first place.

i told these switching regulators not play nicely microphones led strip unconnected wasn't consistent usb or linear regulator power still worked fine.

could explain why issue arises , way fix it? there series of tricks can use limit whatever interference occuring? should give on trying make switching regulator work? capacitors/resistors solve this?

i prefer use switching regulator efficiency reasons, second option wouldn't linear regulator powering node wall adapter , usb cable honest. getting quite frustrating, 1 problem's fix causes suppose thats how things go sometimes.

i including diagram of setup. please note linear regulator should switching regulator , board using not huzzah, nodemcu v3.

components:
-nodemcu v3

-adafruit electret mic

- switching regulator

-n type mosfets

-rgb led strip (currently 5 meter 12 volt 5050 leds, future: 10 meter 24 volt)

for suggestions if there solve issue, not worried if costs $5 versus linear regulator being <$1. more worried space, amount of cords, , relative efficiency.

would really appreciate in solving issue, pretty last part of pretty big , feature rich controller.

hopefully have included information needed.

thank , feel free ask questions!

diagram: https://postimg.org/image/6qcxxpaf1/

are using decent decoupling capacitors? datasheet suggests 10µf on in- , output of regulator. solve noise get.
what 24v power source using? if pwm leds, 24v line may unstable, , therefore regulator unable provide stable 3.3v. maybe add decoupling caps on 24v line well, close fets.

hope helps,
pieter


Arduino Forum > Using Arduino > Audio > Issue w/Analog Microphone Readings


arduino

Comments

Post a Comment

Popular posts from this blog

DHT11 Time out error using v0.4.1library

-
Image
i'm struggling dht11 sensor work on arduino. code compiles without problems in serial monitor output keep on getting " read sensor: time out error" i've tried multiple libraries, adafruit etc still none of them worked. set serial monitor same speed (115200) didn't fix problem.  i'm using:  mega2560  dht11 temp+hum sensor windows10 x64 arduino 1.6.9 library dht11.h v0.4.1 source:  http://playground.arduino.cc/main/dht11lib wiring : blue = gnd yellow = 2 red = 5v (also see picture)  my code:    code: [select] #include <dht11.h> // //   file:  dht11_test1.pde // purpose: dht11 library test sketch arduino // //celsius fahrenheit conversion double fahrenheit(double celsius) {   return 1.8 * celsius + 32; } // fast integer version rounding //int celcius2fahrenheit(int celcius) //{ //  return (celsius * 18 + 5)/10 + 32; //} //celsius kelvin conversion double kelvin(double celsius) {   return ...
Read more

Sketch upload fails with Java error (___REMOVE___/bin/avrdude)!

-
hi, i'm getting same error despite have tried 2 boards , done arduino reinstall in windows 7 machine! while trying update "bareminimum" in verbose mode: code: [select] arduino: 1.8.0 (windows 7), board: "arduino/genuino uno" sketch uses 450 bytes (1%) of program storage space. maximum 32256 bytes. global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes local variables. maximum 2048 bytes. ___remove___/bin/avrdude -c___remove___/etc/avrdude.conf -v -patmega328p -carduino -pcom8 -b115200 -d -uflash:w:c:\users\rui\appdata\local\temp\arduino_build_445303/bareminimum.ino.hex:i java.io.ioexception: cannot run program "___remove___/bin/avrdude": createprocess error=2, system cannot find file specified  at java.lang.processbuilder.start(processbuilder.java:1048)  at processing.app.helpers.processutils.exec(processutils.java:26)  at cc.arduino.packages.uploader.executeuploadcommand(uploader.java:129)  at cc.arduino.p...
Read more

Arduino Uno + KTY81/210 temperature sensor

-
Image
hi, sorry, new , unsure lot of things, need clarification. haven't found information explains how , why things work, "do this, that" i following guide ( arduino-thermistor-temperature-sensor-tutorial ) connect thermistor arduino uno. here temperature sensor information: temp. sensor 2000r +-1% to92 part.no.:   kty81-210 name:   temp. sensor 2000r +-1% to92 description:   2.5mm, 1980...2020ohm, -55...+150°c and here sensor's data-sheet: sensor data-sheet i have connected same way in guide. works , values being serial printed. what don't understand: 1. thermistor's , resistor's ohm value should equal, correct? in case 2000 ohm? 2. thermistor has ptc, i'm guessing have invert math or use ntc thermistor instead correct values? (currently resistance goes temperature goes down) 3. understand code uses steinhart-hart math logic convert resistor value temperature value, need a, b , c coefficients of thermis...
Read more