Tagged Questions

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

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2
votes
2answers
17 views

Sharp IR distance sensor outputting consistently high voltage

I am on a steep learning curve, and a bit bamboozled by my sharp distance sensor (data sheet here: http://sharp-world.com/products/device/lineup/data/pdf/datasheet/gp2y0a21yk_e.pdf). I am building a ...
0
votes
0answers
17 views

Arduino linking assembler funtions

I would like to use (link) a function written in assembler in an Arduino project. What I want to do is: write the function in assembler using avr-gcc calling conventions declare the function as ...
0
votes
0answers
34 views

Is it possible to program a hall-effect sensor with an Arduino?

On pg. 18 Figure 5 of this data sheet you will see a pulse train that allows for programming the sensitivity of the A1362 Hall-Effect sensor. So far I have tried to manually apply required voltage ...
3
votes
3answers
68 views

How can I power 10 12V motors?

I am building an experiment that consists of ten either stepper or DC motors. Ideally I want to just have a switch box with one switch per motor so I can just flip the switch for motor 1 and it will ...
1
vote
1answer
101 views

Multiplexing an 8x8 Matrix - Why Transistors?

I'm trying to understand how to properly multiplex an 8x8 matrix (or any large amount of LEDs) http://arduino.cc/en/Tutorial/RowColumnScanning However, I'm getting a bit confused, since I've found ...
3
votes
2answers
64 views

SoftwareSerial on Arduino Mega

I'm trying to figure out if I can send and receive serial data on ports 23 and 25 of the Arduino Mega 2560, and I'm very confused by seemingly contradictory information on the Arduino website. From ...
0
votes
1answer
67 views

virtual light communication

I have to design a project that uses an LED to transmit data and a LDR to receive the data or signal from the LED. But the problem is I have to use two Arduino UNO boards, one for LED transmit and ...
3
votes
0answers
60 views

Arduino + Ethernet Shield hangs after some time

I am using an arduino to retrieve some data from a web application. The problem is that after some time it starts to hang. For testing I used the default ...
1
vote
1answer
39 views

variable speed sewing machine motor with foot switch to start and stop

Hello I'am trying to get some information,for a project of mine. The project is to operate the foot pedal on my drum set, that strikes the bass drum head with a beater by pushing down with foot ...
-3
votes
1answer
56 views

Arduino 3 digit LCD calculator

We would like to build a calculator using Arduino which uses 3 digit LCD and a keypad similar to digital phones. (# for plus , * for minus) Which components and way is good enough to not to run out of ...
4
votes
0answers
59 views

How to properly open and close files “inside” a member function?

I am using Arduino Uno and the Ethernet Shield with a 2GB SD Card. I have the following working code intended to be used to write data on the SD Card (note: the SD Library is properly initialized and ...
1
vote
1answer
42 views

Arduino infrared problem with universal remote

I am playing with Arduino and Ken Shirriff's IR library. I am trying to control Sony audio receiver using codes I found on the net. Everything works OK, I am able to control the device by sending IR ...
1
vote
1answer
68 views

Arduino and Computer Communication

On the arduino homepage it says about Communication using the ArduinoMega256 The Arduino Mega2560 has a number of facilities for communicating with a computer, another Arduino, or other ...
4
votes
2answers
90 views

Ultrasonic sensor doesnt work inside case

I have a very strange error. My ultrasonic sensor, when both speakers are sticking out of my case, don't work at all. It's a black case. It gives very "near" readings". But it does work when outside. ...
0
votes
1answer
91 views

Making a Monome using ArduinoMega256 [closed]

I'm attempting to make a Monome clone. (What is a Monome?) Now hardware wise I should be fine. I ordered 64 buttons (4 4x4 Button Pads) and making the PCB to hook it up to Arduino Mega. So I will be ...
2
votes
2answers
126 views

Why people choose to buy Arduino when they can get a cheaper and better dev board? [closed]

Why people choose to buy Arduino when they can get a cheaper and better dev board? For example, Arduino Uno with ATmega328 has only 16Mhz clock speed, 32KB Flash and 16 IOs costing 20£. Where as for ...
1
vote
2answers
51 views

DS1307 RTC not working with rweather library

I'm using the DS1307 RTC together with arduino and this library http://rweather.github.com/arduinolibs/classDS1307RTC.html When i power the chip directly from the 5V and GND outputs from my arduino ...
-4
votes
1answer
49 views

I'm driving a large 7-segment display using a microcontroller [closed]

I've seen that others are using TPIC6a596, a combo 74HC4511+ULN2003A, and also TLC5916. Just to confuse things more (for me anyways), there are also MAX7219 ICs that seem appropriate (maybe not for ...
-3
votes
1answer
58 views

Programming 3.3v ATMega328 running at 16MHz [closed]

I know that running the 328 with 3.3v at 16MHz is "overclocking" it and slightly out of spec. Because of limited board space i'd like to do this though as all other components are 3.3v. I need the ...
4
votes
0answers
54 views

Using Piezo Vibration Sensor with Pull-Down Resistor - Arduino

I'm using a MEAS piezo sensor (this one: https://www.sparkfun.com/products/9196) to detect very slight vibrations, but I'm having trouble selecting a pull down resistor that allows it to be sensitive, ...
1
vote
1answer
28 views

Using alarms with the DS1307RTC

I'm trying to wrap my head around following library: http://rweather.github.com/arduinolibs/classDS1307RTC.html I can see that the DS1307RTC has a writeAlarm and readAlarm function. I'm not sure how ...
-3
votes
1answer
63 views

2N7000 connection diagram

I need a simple diagram showing me how to switch 12v LEDs with a 2N7000 using an Arduino. My experience is moderate, but a simple diagram should get me started :) to summarize i want to switch 12v ...
3
votes
2answers
38 views

Reset pin on ATtiny84/85/2313 clarification

I have two questions that I was hoping someone could clarify with a quick True/False. When using the ATtiny85/85/2313 the reset pin is connected to a 10k resistor which is connected to VCC. When ...
5
votes
2answers
107 views

Sensing magnetic pulses from a rowing boat impeller

I'm a mechanical engineer at uni who has some basic experience in electronics and programming. I'm building a system for my rowing boat to help me with my training. This will give me feedback on a ...
0
votes
1answer
34 views

Ultrasonic Sensor URM37

I have just gotten a URM37 ultrasonic sensor. I need a way to measure the distance to an object from two sensors (for maneuvering). Can I know if ultrasonic sensors with 2 sensors are suppose to be ...
4
votes
1answer
100 views

CAN bus bit timing with 16 MHz crystal

I'm trying to receive CAN messages from a radar, whose specification define the following data for bit timing: ...
-2
votes
1answer
29 views

Problems With The Desktop Contemplator Code [closed]

I cannot get the ContemplatorNV.ino code to down load from the Nuts& Volt article. I have tested the complier on an Arduino Uno on code I know works. This at least proves the compiler, USB ...
2
votes
1answer
39 views

Motomama arduino motor shield issues

I loaded up the example sketch for the itead Motomama on my Arduino Mega ADK and I see the green led's in the middle of the board slowly going on and off as expected from the sketch. The problem is, ...
0
votes
0answers
47 views

arduino and the rc car [closed]

I am trying to build a chassis for my robot, so I chose the base of a RC car. I took out its receiver board and replaced it with an arduino board to control its motors (steering and rear motors) but ...
2
votes
2answers
101 views

3.3v input to Arduino digital pin

Is it safe to bring a arduino digital input pin to high on a 3.3v input..from the 3.3v output of the arduino pin? Because, I need to reset a 3.3v device on one end..and get the arduino to know about ...
1
vote
3answers
61 views

Ethernet shield-like functionality for ATTINY IC

I'm looking to shrink-ify my arduino project in the future, and I was wondering if there's anything like an all-in-one 'tiny' ethernet board that'll work with an attiny chip, preferably with the ...
4
votes
1answer
69 views

How can I detect which arduino board (or which controller) in software?

I have a project that I want to work on either a Uno or a Mega (or even a Due) and it would be nice if I didn't need two versions of the software. For example, on a Mega, to use SoftwareSerial, you ...
4
votes
2answers
65 views

Connect XBee to Arduino without shield

Is it possible to connect the XBee to the Arduino without a shield? Currently most of the sources that I have looked at have some sort of shield connected. I use this shield currently: ...
-1
votes
0answers
25 views

running custom functions with firmata protocol

I am currently playing around with the firmata protocol for the arduino. Its great for reading and setting the current states of the Input/Output pins on the Arduino. Now I want to run some custom ...
0
votes
1answer
81 views

Arduino Leonardo doesn't get auto-detected in Windows 7 (64bit)

I recently purchased an Arduino Leonardo to control my Sumo robot. I plugged it in to my friends computer and was able to use the Arduino IDE to upload code to the board and run a simple wheel-test ...
1
vote
0answers
44 views

Cosm.com - Getting return -1 when cosmclient.put

I've implemented successfully in the past, but all of a sudden stopped working, an integration between Arduino with Ethernet Shield, communicating to cosm.com to put live the value of a temp sensor. ...
-1
votes
0answers
76 views

Reading serial data on Raspberry PI [closed]

I'm having a trouble figuring out where do i make a mistake. I've had a little rfid-read project which was developed on Arduino. Recently i have obtained a raspberry-pi and i wanted to port my old ...
1
vote
2answers
55 views

Problem on printing “Ethernet.localIP()” to Serial Monitor

I am using Arduino Uno and the Ethernet Shield. I have the following code: ...
0
votes
0answers
61 views

How to hook up multicolour 5x8 LED Matrix to Arduino. It has 14 pins on each side

How to hook up multicolour LTP-2558AA 5x8 LED Matrix to Arduino? It has 14 pins on each side.
-1
votes
1answer
75 views

Help with code on 4 x 4 x4 LED cube with Arduino? [closed]

Recently I made a LED cube, on my own, and I want it to display characters, alphabets numbers going layer by layer using the concept of multiplexing and POV (persistence of vision). I googled a lot, ...
1
vote
1answer
159 views

How can I send video from my Arduino camera module video to my Android screen?

I'm trying to connect a camera module to my Arduino Mega, connect my Mega to my Android phone (throught BlueTooth or other), and send the live view of the camera to the mobile phone. I saw a video ...
0
votes
2answers
40 views

Using 2 xbees Series 2 and arduinos

I have 2 xbee series 2s that I want to talk to each other with ardunios. I have the ardunio xbee shields but I can't find any good resources on how to get them to communicate together. So how would I ...
2
votes
1answer
56 views

Arduino program not incrementing loop counter

I am programming effects for an LED cube. The cube and the independent functions are working correctly. The problem occurs when I call turnon_layer function in a ...
3
votes
5answers
255 views

How can 8-bit processor support more than 256 bytes of RAM?

If a 32 bit processor can handle 4GB of RAM(aproximately), why do my arduino mega 2560 has 8kB of SRAM, if being a 8-bit processor allows it to handle just 256 bytes?, or am i reading this next page ...
2
votes
2answers
52 views

IR Reflectance Sensor for a Wheel Encoder - Analog or Digital?

I'm in the process of building wheel encoders for my robot and have come across 2 different IR Reflectance sensors. Analog Digital I'm trying to find out what the potential benefits or drawbacks ...
4
votes
1answer
112 views

Arduino Uno with 12V pump: transistor or optocoupler+12V relay?

I'm not a real expert in electronics but I'm going to start a new project that has completely captured me. I need to drive a 12V pump with my Arduino Uno. The pump is "Dp0102" (12V, 0.7A). To power ...
3
votes
2answers
93 views

Maximum power for Arduino Monster Moto Shield

I'm reading the specs for the SparkFun Monster Moto shield which specifies that Max Voltage is 16V Maximum Current 30A Given Ohm's law, does that mean that the maximum power is 480 watts? That ...
3
votes
1answer
149 views

What is the current draw of an Arduino Due board when sleeping?

I have application which requires 1 year+ operation on a small battery (2xAAA or coin cell). It will be spending 99.99% of the time sleeping only requiring an internal timer for periodic waking and ...
7
votes
3answers
232 views

How do I get +5v for loud noise, 0v for silence from Electret Microphone (or other components)?

I have been asking a few questions here to get to a proper one, the initial questions I asked are linked to at the end. I used Fritzing to make up some schematics of my initial thoughts, but at the ...
4
votes
2answers
82 views

Pull-down resistor value for FSR's voltage divider circuit connected to Arduino

I am working on a project which includes two FSRs (force sensitive resistors) connected to an Arduino Uno. I have each FSR setup as in http://www.instructables.com/id/FSR-Tutorial/?ALLSTEPS, but each ...

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