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0
votes
1answer
70 views

PWM or Phase Control Dimming?

I want to dim a lamp around 70W or more using arduino. I have found two ways for doing that. The first one is to make a circuit that "cuts" the sine wave and produce the dimming effect (link). The ...
0
votes
2answers
32 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
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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 ...
2
votes
2answers
413 views

MIDI To Polyphonic Square Wave on Arduino

I've been struggling with this for a few days now, and I would really like to get on with my project. Unfortunately this is holding me up. What I am trying to do is retrieve MIDI signals sent over USB ...
2
votes
1answer
80 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, ...
1
vote
1answer
165 views

Control NES via Arduino

I'm relatively new to electronics - most of my experience is just tinkering with Arduino projects in a more limited sense. I've been working on a project for a week now and have a bit of a (probably ...
0
votes
1answer
28 views

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

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
votes
0answers
200 views

Cloning a rfid tag with arduino

My school uses RFID tags to turn on air conditioners and only professors have it. This is to prevent students leaving the air conditioners turned on. I've been thinking about cloning a tag just to ...
0
votes
0answers
38 views

Bluesmirf sparkfly bluetooth HID Radio [on hold]

So currently I have purchased this Bluetooth HID radio, product number: RB-Spa-608 I am trying to connect this Bluetooth radio to digital pins of my Arduino Mega to set the baud rate to 56700 so it ...
0
votes
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
47 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
50 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 ...
0
votes
1answer
129 views

Understanding how to use an accelerometer to detect vehicle collisions

Objective: To use an accelerometer to detect where on a vehicle a crash occurred (e.g. impact occurred on the passenger side.). Parts: Arduino Uno and LSM3030DLHC accelerometer Background: I've been ...
2
votes
3answers
244 views

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

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 ...
1
vote
1answer
216 views

Arduino and N mosfet lithium battery charging/discharging measuring capacity

I need an Arduino based lithium battery tester that uses N channel Mosfets to switch On charging from and external power source and discharging through a 2 Ohm resistor. I have no issues with either ...
1
vote
3answers
337 views

If one has used PIC uC, how different is it to migrate to using a different uC like say Arduino or ARM?

There seem to be quite many vendors making uC and some uC are more popular than others say for example Arduino and PIC because of their low cost and abundant features and ARM because of its high ...
1
vote
1answer
36 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. ...
0
votes
0answers
18 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 ...
0
votes
3answers
70 views

Parallel LED strings of different colors and Arduino

I need to use 7 strings of led, each one of a different color. I will control each string using a Arduino and the BC 337 Transistor. The string will be connected to a 12V power supply. I have read ...
1
vote
3answers
138 views

Schematic & pin reduction

I am using arduino Uno for developing my project. There are totally 24 analog hall sensor out put,1 temprature ananlog output, 1 Rshunt voltgae measurement. There are totally 26 Analog sensor.I am ...
0
votes
1answer
44 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 ...
1
vote
1answer
26 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
votes
0answers
31 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
20 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 ...
0
votes
1answer
314 views

Arduino & Niko Home Control

I would like to know if anyone has been able to take control over 'Niko Home Control' with Arduino? I Googled, but can't find much on this topic. Is it even possible? I guess it's not really ...
1
vote
1answer
30 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 ...
2
votes
3answers
101 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 – ...
1
vote
1answer
52 views

Completing circuits with transistors and arduino

Hello and thanks to anyone who helps. I am trying to create a test bench for a control board we commonly work on at our business. One control board has 11 pins that a ribbon cable would be connected ...
1
vote
2answers
70 views

Get current gear from rpm and speed through OBD2

I would like to modify my car with the help of Arduino to display the current gear. I wasn't quite sure where should I post this question as it is a car topic, as well as an electric engineering and ...
0
votes
0answers
58 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 ...
0
votes
1answer
48 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
votes
1answer
80 views

Can I use arduino to feed this circuit instead of an external power source?

I am following this tutorial to connect the output from my guitar with arduino. I'm wondering: is it possible not to use the batteries, and to feed the circuit with the 5V output pin provided by ...
2
votes
1answer
547 views

ATTiny Default AREF

I am trying to get the Adafruit Electret Microphone Amplifier to work with an ATTiny85 but am having some trouble with the reference voltage. I am using a 5V circuit because I am also powering a strip ...
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
2answers
61 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
59 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 ...
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
54 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
2answers
62 views

Problem using Relays at 220V with 595

I'm having some complications when I'm trying to control 16 Relays using 2 595, these relays control loads connected to 5V, 12V and 220V. There are 8 loads at 220V using the 8 LSB from my SPI ...
0
votes
3answers
104 views

Wheel speed from Shimano dyamo hub using arduino

I'm trying to figure out a way to extrapolate wheel speed from the Dynamo hub I just purchased. I outputs 6V 3W AC, and I would like to potentially measure it using an arduino if possible, I' assuming ...
5
votes
1answer
153 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 ...
-1
votes
0answers
18 views

BLE on Arduino - can the Arduino act in slave (peripheral) mode? [on hold]

I need to have two IOS devices connect to an Arduino via BLE. I am using a BLE modem connected to the Arduino, and managing communication on the Arduino side using SoftwareSerial. I'm managing ...
1
vote
3answers
59 views

Using A Relay To Control A Lamp

I'm experimenting with capacitive sensors acting as switches and want to actually give my circuits some practicality. I've been researching how to use relays with microcontrollers (in my case, an ...
0
votes
0answers
11 views

looking for a transmitter A2DP bluetooth module [closed]

Currently found this: https://www.sparkfun.com/products/11678 that could be both a master and a slave. But it seems like an overkill and a bit pricy for me. There are many under 10$ receiver modules ...
0
votes
0answers
20 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 ...
2
votes
1answer
319 views

Olimexino 328 upload problem

I'm young user of Arduino IDE and with my new Olimexino-328 it's quite impossible to upload any sketch without stk500 sync error : ...
1
vote
3answers
786 views

Suggestions for solar / LiPo powered 3.3v supply for Arduino

I am building several slightly-differently-purposed Arduino + Xbee systems to monitor various things around my home and property. Some of these are line powered, while others must use solar. Many ...