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1500 questions
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6 answers

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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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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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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14
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1 answer

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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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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3 answers

Arduino Mega timeout communication with programmer error

I have an Arduino Mega 2560 and it was working fine until about lunch time when I started getting this error: avrdude: stk500v2_ReceiveMessage(): timeout avrdude: stk500v2_getsync(): timeout communicating with programmer I know it isn't the code…
bladepanthera
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Cannot program two arduinos at the same time because they both use the same COM port

I am not able to program my second arduino because they both use the same com port. In other words this picture says it all: In order to upload my sketch I have to disconnect one arduino. How can I tell windows to use a different COM port? It will…
Tono Nam
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6 answers

Why do you need a second resistor when using a photoresistor/LDR?

A photoresistor is already a resistor and will limit the voltage in the circuit. Why can't this be connected to a pin and measured? Why is a second resistor needed to connect the photoresistor to ground?
Jason
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_delay_ms() is much slower than expected (by a factor of 6) on TinyAVR 0/1 (ATTiny1604)

I designed a custom AVR development board using the Atmel ATTiny1604 microcontroller. It belongs to the new Tiny-0 family, due to its recentness, some required changes to relevant toolchains have yet to be included into the stable version (I prefer…
比尔盖子
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