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1answer
20 views

Java/Arduino Controlled 120VAC Power Outlet

I'm working on a project with an end goal of controlling a power outlet with a Java program. Currently, I have the relay wired to outlets, a 3 prong 120 VAC plug, and my Arduino. Everything works as ...
0
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0answers
27 views

Recording audio using VS1053 chip

I am trying to record audio using the MAX4466 op-amp breakout from Adafruit (link) and VS1053 shield (link)that I bought from Adafruit. I am able to record audio by connecting OUT --> MICP, GND --> ...
0
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0answers
54 views

Possible damage to arduino from touching metal

I put my arduino on my laptop while it was running. It landed flat on the laptop cover with the soldered pins on the underside touching the laptop. My laptop is made up of aluminium. Nothing happened ...
0
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0answers
22 views

Feasability of an Arduino indoor positioning system using BLE

Our project is to guide a blind person in a known environment (here it's an exposition hall), and we need to have a precise way of figuring out where the user is. Our current solution is to use ...
0
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0answers
35 views

AC fan speed control (using Arduino)

I wanted to control a 220V, 50Hz AC ceiling FAN using PWM output from an Arduino microcontroller and I have referred to several resources regarding this. Resources I referred ...
1
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0answers
48 views

Playing WAV audio files from an SD card on Wiring board?

I'm using the Wiring framework for building a custom alarm clock. So far, I've been able to work with several Arduino libraries on Wiring, just by including Wiring.h instead of Arduino.h, as ...
0
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1answer
25 views

Transistor switching noise problem (Guitar pedal idea troubleshooting)

Have a simple circuit : i want to create a gated effect that cuts signal in and out .. it works but i can hear the switching sound of square wave generated by arduino through my amp speaker .. ...
0
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0answers
7 views

Arduino Board with Microphone [migrated]

I have this microphone (http://www.digikey.com/product-detail/en/CMA-4544PF-W/102-1721-ND/1869981) and an Arduino Uno board. I'm trying to read audio values off of my microphone (to test the noise of ...
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0answers
22 views

Correctly Using ACS712 hooked to a microcontroller

I am making a project that involves AC current measurement from the Mains. I have done a bit of research and have found that the ACS712 can do this. I would like to know the correct way of using ...
5
votes
4answers
1k views

What is a push-up/pull-up resistor?

The only thing in EE I know perfectly is Ohm's law, but learning eagerly. So pardon my ignorance. I am reading a book on Arduino & I just do not understand the concept of push-up resistor, ...
1
vote
1answer
138 views

Use indepenent power sources for Arduino and for breadboard

I am building a breadboard circuit to be controlled by Arduino. The circuit consists of about 20 bright leds simulating a vehicular lighting system (ten leds for headlight, 4 in taillight, 3 for each ...
-8
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0answers
38 views

Program to detect speed through GPS [on hold]

I am working on project i.e arduino with GPS to detect speed so I need help for same.I need program for make GPS work with arduino. Thanks
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0answers
37 views

How to power an IoT (w/gps module) bracelet?

I'm trying to build a bracelet that has IoT (internet of things capabilities). I am currently prototyping with a spark core and using its wifi module to hit a server. While this works great with a USB ...
0
votes
1answer
44 views

High-current motor on isolated circuit causing servos to move

I have a robot with several servos controlled by an arduino. Also attached is an electric airsoft gun, which draws considerable current. The gun is on an independent circuit with a separate battery ...
-3
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0answers
49 views

how is wired communication of arduinos over 2km is possible

i want to transfer the data sensened by the sensor which is of few KB over a distance od 2 km so how is that possible
-2
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1answer
68 views

38 kHz signal arduino demodulation

I need to demodulate signal with frequency 38 kHz coming from remote controller without IR receiver. I need to demodulate it and as a result get information from it. Is there any examples of similar ...
0
votes
1answer
15 views

Current and voltage from PV ( LTS25NP , LV 25-P)

So in my design I am going to sense two PV panels in series ( Both voltage and current) to extract the Maximum power point (MPPT by arduino) so the input of both sensors will be the PV output and the ...
0
votes
1answer
44 views

Problem interfacing with an lcd with an arduino

My lcd arrived today and i saw that when i connect the backlight pins (A and K) to GND and +5V, the backlight turns on, but i cannot control it with the potentiometer. The wiring seems fine (ive ...
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vote
2answers
60 views

GPS in combination with servo on Arduino

Me and my friends are building a boat which needs to steer towards certain coordinates. We have a GPS and a compass on board. We have written code which calculates the direction that the boat has to ...
0
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0answers
23 views

Use remote controller as keyboard matrix Arduino

I need to connect remote contoller directly to arduino without using IR channel, so just like a plain matrix keyboard. I guess that it is possible just connect remote lines and row to arduino directly ...
0
votes
1answer
32 views

Arduino driving servo through SSR 'flickers' on and off

thank you for your help in advance. I have a circuit configured as shown in . I got this arrangement from an earlier thread. An arduino controls a DC solid state relay, and it works fine when my load ...
0
votes
1answer
41 views

Loudest Piezo with low voltage and current?

I am making a board which will communicate wirelessly with a smart phone. When I send a specific command, I want it to sound an alarm to the user, making it able to be found when lost. I've got ...
0
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0answers
9 views

Slaving multiple Arduino's via SPI [migrated]

Hello StackExchange community! I am attempting to use SPI communication between a Master Arduino Mega 2560, and standalone Slave Arduino Unos (4, to be exact). The intention is for the Uno's to do ...
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2answers
52 views

How to use a solid state relay in a dip package to drive a 24 vac relay

We have a fan coil unit in our server room where I work that utilizes a microcontroller to control temperature and humidity. I have an HVAC and electrical background so I am familiar with ...
0
votes
1answer
32 views

RFID System for presence and identity identification of people inside different areas of a house [closed]

I'm developing a project for my home and I would like to make a system that allows me to identify people that enters the different rooms of the house using a RFID tag bracelet and emissors ...
0
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0answers
22 views

Connect the output of an Arduino to the input from another Arduino [migrated]

I'm making a project and i'm trying to send bits from an Arduino to another Arduino with the digital pins. So my setup are 2 Arduino's connected with a jumper. I connected the grounds and they have ...
1
vote
1answer
50 views

Running a 7v shift register from arduino 3.3v

Im trying to learn some electronics, so im not that confident with some of these systems, I recently bought a load of the alphanumeric displays from Sparkfun but foolishly read the data sheet for ...
0
votes
2answers
56 views

How to test if my program for SPI communication is working correctly?

I have developed a simple code for learning about SPI in Arduino Due. The code is compiling properly and now I would like to learn the next step on how to test the code with the board and get the ...
2
votes
0answers
272 views

How to calculate phase shift between two square waveforms with Arduino DUE [migrated]

I have two square wave signals with the same frequency. I want to measure the phase shift between these two signals. There will be a small phase difference between two signals. (0-90 degree) and the ...
0
votes
0answers
34 views

Burn Micronucleus bootloader to use ATtiny85 via usb (avrdude)

I am working on an ATtiny85 usb development board, and I need to flash the Micronucleus bootloader on it. I have heard that this bootloader allows the ATtiny85 to be programmed via usb from the ...
0
votes
0answers
12 views

Reprogram Arduino Mega 2560 using Duemilanove? [migrated]

Experiencing that Mega 2560 uploading problem. Tried updating the IDE, worked for a while but symptoms went back. Now i want to reprogram that chip. I'm asking this question cuz hardware ain't free ...
1
vote
1answer
42 views

ATTiny IR receiver logging erratic values, but works consitently on Arduino Uno

I am making a an ATTiny85 IR receiver, programmed with an Arduino Uno. I'm using a modified version of this code (because the other IR libraries I found weren't compatible). It's working... sort of. ...
1
vote
1answer
32 views

What voltage reference is the pwm signal using in the QUADRUPLE HALF-H DRIVER SN754410NE?

I have a QUADRUPLE HALF-H DRIVER SN754410NE, and i saw online that the 5V from the arduino goes to pin1, pin 9 and pine 16 and on pin 8 you attach a separate 5v supply that has at least or more than ...
0
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0answers
33 views

Programming multiple ATmega32U4 devices at once without USB

I have a bunch of Atmel controllers which are identical and run the same program. While developing i need to mass program all controllers somehow. The only way they are connected is via I2C. And ...
-2
votes
0answers
14 views

Multiple interrupts [migrated]

I am trying to create an Arduino program that combines a pulse sensor (that measures the Beats Per Minutes) and a music shield. I am experiencing some difficulties with the coding because the pulse ...
0
votes
2answers
23 views

avrdude: ser_open(): can't open device “/dev/ttyUSB0/”: Not a directory

Recently I have been trying to learn how to program Arduino in Code::Blocks. I used the AVR project wizard to create my project. The program compiles flawlessly into a .hex file that I want to upload ...
1
vote
1answer
33 views

Power arduino nano 3 externally

I want to buy an arduino nano 3 but it seems that it can be powered only by usb. I want to use it in some places where I don't have a computer so I can't power the arduino. Can I use the VIN pin to ...
0
votes
1answer
53 views

Water conductivity measurement AC, interfacing with arduino

I want to implementate this device, mentioned in the title. The problem is how to correctly build the " read out device" that is clearly a wheatsone bridge? But in AC, the problem is the signal ...
2
votes
1answer
146 views
+50

Raise input for a voltage monitor IC

I was looking over LTC2990, which is a voltage, current and temperature monitor. It is perfect for my project as I'm newbie. I want to build a power supply which will show on a display the voltage, ...
2
votes
3answers
104 views

Is there a Multiplex with X inputs to control X outputs?

I want to use a multiplex to controll my circuit. I just want something that can be a switch between an input and output. I thought to create this circuit: simulate this circuit – ...
0
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0answers
62 views

Control tons of servo motors with one pin on Arduino?

I'm controlling 15 servo motors with Arduino Uno. The 15 servo motors will be doing the same thing all the time, so I'm trying to using one pin for all of them (But I'm using external power source for ...
1
vote
0answers
10 views

Determining power consumption with Arduino and JeeLib [migrated]

I built a basic LED blinker to serve as a car theft deterrent. Originally I was using a 9V battery and delay() but I've refined my approach to consume less power. Here's my code, utilizing the JeeLib ...
0
votes
1answer
52 views

aquaculture fish counting

in fish farming the fish are fed at a percentage of their weight. i measured the weight of the fish that i put into the tank, and i can remove the fish once in a while to reweigh them but that is very ...
0
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2answers
64 views

Can I connect Arduino ground to the negative terminal of a battery?

I wanted to use a transistor to switch a circuit that has its own power source (a battery). It appears you could do something similar if you had two battery power sources, but in simulators, it ...
0
votes
0answers
7 views

How to communicate the Arduino board with SIM900? [migrated]

I have a problem. I bought a SIM900 board, but I can not connect there with the Arduino. To send AT commands on the serial the SIM900 doesn't respond, but the LED indicating that the network is on. ...
0
votes
2answers
56 views

Desoldered Resistors on rotary encoder breakout can I just short them togather

Someone gave me this rotary encoder breakout, but they unsoldered the SMT resistors for some other project. Now I don't have any SMT resistors on hand and can't justify buying a roll of them. So would ...
0
votes
0answers
60 views

Digital Variable Resistor 0.5A

I have slider resistor with two terminals, it has 11 positions, and from my measurements, it provides this when it's running, it is DC. I want to create a digital way to control this, any ideas how ...
6
votes
1answer
198 views

Arduino IR Receiver

I was reading this tutorial http://arduino.cc/en/tutorial/button, and I want to do the same, but with a 2 pin IR receiver LED. The problem is, the LED needs 1-2v max, or it will break. How can I use ...
0
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0answers
22 views

Bluetooth audio transmission

I am trying a project where I would play music from my tv(doesn't have bluetooth) to the commercial Bluetooth headphones. I have read this post. I already have HC 05 Bluetooth module and want to use ...