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1500 questions
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2 answers

How do I use Arduino and node.js?

I am new to Arduino, however I have experience in web development, lately I have been using, meteor js and the mean stack for different projects. However, I am open to trying any language for development. What I am trying to do is build a simple…
Anders Kitson
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1 answer

Problem programming Mini Pro via Arduino as ISP

I just picked up a pair of Arduino Mini Pro 5v clone boards (Inland, sold at Microcenter, currently $4 USD) and I wanted to use my Uno as an ISP like I've done with ATmega328 and ATtiny85 chips before. I've programmed the Uno with the instructions…
Dennis Munsie
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Will the arduino power autoselection logic short the regulated 5V and the USB 5V?

From the reference design of the Arduino UNO r3, I find that USBVCC will be connected to +5V via mosfet T1 if Vin is below 6.6V. Doesn't this short the two sources if Vin is just below 6.6V? The datasheet for regulator U1 (NCP1117) mentions input…
Trygve Flathen
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8
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3 answers

What is the rise time of an output pin of atmega328 changing its state?

I've already searched a lot and didn't found the answer. Also, I don't have an o'scope. Anyone can help me?
Pedro Quadros
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8
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7 answers

Good button debouncing/stateChange library

I need debouncing/stateChange for a push button configuration. Is there a good library for debouncing/stateChange buttons in Arduino (without delay)?
Ariyan
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8
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3 answers

Serial Print, String And Variable On Same Line

How can I print to the serial monitor a string or just single character followed by a variable like "L 55"
Root0x
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8
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1 answer

7 segment LEDs on wood face

I'm not sure this is right place for this question, but does anyone have any idea how a 7 segment display is projected or embedded in wood for products like this? Full product info at…
devth
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8
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1 answer

Arduino and ESP8266 Web server

First things first, if there was an ESP8266 StackExchange, I would post this there. I am setting up a web server that will programmaticly be controlled from an external Python script, and I am currently able to send this server data using this…
Butters
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2 answers

Is there a way to make wiring a bare microprocessor to a shield easier?

I currently do most of my AVR work on breadboards, but the large variety of Arduino shields and code out there makes me wonder if I'm not beating my head against the wall sometimes, and looking up port to pin mappings both wastes time and slows me…
Ignacio Vazquez-Abrams
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3 answers

What's the smallest (cheap) USB Host solution for Arduino?

I'm building a project that will connect to users' phones (Android at first, but iPhone too, if there's enough interest) via USB. Of course, this means that I need a USB host in the project. The total size of the device has to be about the size of…
Sniggerfardimungus
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8
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2 answers

What are the implications of running an ATmega328P at 8 MHz and 3.3 V with the Arduino system?

I'm working on a custom arduino that will run at 3.3 V with no regulators or USB chips (for power consumption). I've heard that overclocking the chip at 16 MHz/3.3 V is generally fine, but I'd like to stay within spec anyway. First: to run at 8…
Vulcan
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8
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6 answers

Compiling is slow

Compilation of even the simplest program (like Blink) is extremely slow, the progress bar often hangs halfway for nearly half a minute. Is this normal? I understand that not all computers are equally fast, but there's a huge difference between 3…
Joris Groosman
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8
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6 answers

Two Arduinos Send data via Analog Pin?

What I want to do is allow Arduino A to send some constant value to Arduino B. I sense something inherently wrong with my approach, but I cant figure out what it is. So in the diagram below you will see Arduino A setting its Analog Pin 0 as OUTPUT…
lucidgold
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8
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1 answer

RTClib library dependency on Wire library

I downloaded the RTClib library from https://github.com/adafruit/RTClib. In every provided example, #include is written immediately above #include "RTClib.h" at the top of the sketch. Why is this necessary? I know the RTClib library…
Zilliput
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8
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1 answer

Increasing payload size above 32 bytes using nRF24L01+

I tried to modify the example in the following page, by replacing the given string with a 56 bytes one after making all the suitable changes to read(), write() and max_payload_size(increased to 64 bytes), payload_size() parameters/methods in the…
Naveen
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