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Want to create bluetooth audio control (volume up/down, play, pause, etc.) for smartphone

I want to create a bluetooth remote audio control to control smartphone audio, essentially identical in function to this type of…
Howiecamp
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4 answers

Using millis() and micros() inside an interrupt routine

The documentation for attachInterrupt() says: ... millis() relies on interrupts to count, so it will never increment inside an ISR. Since delay() requires interrupts to work, it will not work if called inside an ISR. micros() works initially, but…
Petr
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Mysterious RX pulses on UART connect on OS X Arduino Due

Arduino IDE 1.6.8, Arduino Due, Mac OS 10.11.3 I am seeing eight mysterious pulses on the RX line when I connect to the serial port using multiple client libraries (Python, JavaScript as well as the built-in Serial Monitor in the IDE). About 78-79us…
Blake Ramsdell
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Sending Large Amounts of Serial Data

So in the fields of robotics sometimes you need multiple boards and or computers linked together to share information or save statistical data. Currently I need to send a few different variables over a serial connection and was wondering what was…
Steven10172
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Difference between /dev/ttyACM0 and /dev/ttyS0 (Arduino IDE ports under Linux)

I use the Arduino IDE to upload sketches to my Arduino Uno. My OS is Linux Ubuntu 14.04 LTS. The Arduino IDE has two ports by default for communication with the Arduino Uno: /dev/ttyACM0 /dev/ttyS0 What is the difference between these two ports ?…
martin_0004
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14
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How to connect two Arduino without shields?

I'm planning an Arduino system that consists of several Arduino boards. The maximum distance between the boards is about 50 meters. I want to send basic data between these, like short strings or integers. I know I could send data through ethernet…
totymedli
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What's the deal with Uno's pin 13 LED?

(I have a Sparkfun RedBoard, but this question seems to apply to R3 Unos and Uno-compatible boards.) As I was building the first circuit in my SIK guidebook (add a resistor, LED, hook it up and make it blink from code), I noticed a blue LED on the…
KatieK
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If I put a shield on an Arduino, can I use the Arduino for anything else?

I did some basic Arduino examples in the recent past, but I have never actually seen a shield for Arduino firsthand. So I wonder: If I put a shield on an Arduino (for example, the Adafruit Motor Shield), does it "block" the entire Arduino, including…
Majiy
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6 answers

Is there a way to play sounds from an Arduino without using a sound shield?

I would like to play a wav file (spoken words) from my Arduino. I do not want to add a sound shield. Is there a way to play a sound through an output pin? The quality does not have to be great.
Hoytman
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How to avoid that my arduino clicks eternally?

I have accidentally implemented a program that imitates the click of the mouse. The problem is that now I can´t delete the program because each time that I connect the USB, the computer starts clicking everything and it is not possible to upload a…
Zero point
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14
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3 answers

Washable, Wearable Tech with Arduino

Question: How does one prepare clothing with embedded electronics for washing? Background: There are several Arduino boards/clones that are designed for "wearable tech." (For example, the Lilypad.) Wearable tech with LED light patterns,…
apnorton
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14
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Installing a different firmware on Arduino

Is it possible to upgrade the firmware on an Arduino so that it can do more things such as change undervolting/ overvolting in order to provide more processing power. To do this you would have to most likely re flash the chip itself, so how would…
JVarhol
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8 answers

Is it possible to upload a program from a tablet?

Is there any easy way to upload a program/sketch from an iPad or Android tablet without adding extra an shield (Bluetooth or Wi-Fi)? If not, can it be done using shield? Which shield is preferred? Also what are the IDE options available?
Rajendra
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What is the point of D0-D3 on LCD?

The Arduino LiquidCrystal library has 4 constructors with different arguments: LiquidCrystal(rs, enable, d4, d5, d6, d7) LiquidCrystal(rs, rw, enable, d4, d5, d6, d7) LiquidCrystal(rs, enable, d0, d1, d2, d3, d4, d5, d6, d7) LiquidCrystal(rs, rw,…
Friend of Kim
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Changing the brightness on a Hitachi HD44780 LCD screen

I am finishing up a project- an LED game alarm clock. Seeing as this is a clock, I need to have a way to conserve power, which right now my Uno R3+ is eating up like a politician. My question is, how do I turn the screen off, or turn the back-light…
Mr. Floppy
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