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1500 questions
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Precision voltmeter using Arduino

I am newbie, I need to measure precise voltage in range 0.00-0.80V, two digits precision. The voltage will not be greater than 1V-1.2V. I wonder if I need divider or not, I am sure that voltage won't rise above 1.2V. Can I connect the point to…
solderingiron
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Unable to use RGB matrix and the serial monitor at once

Recently I bought the following matrix: https://learn.adafruit.com/32x16-32x32-rgb-led-matrix/overview I own an Arduino Uno for those who are interested. I got the 32x32 variant and I am very happy with it. I managed to connect all the wires…
Quartermain
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Can I use a GPS from old Garmin with an Arduino?

I'm working on an Arduino project, and I'd like to add GPS functionality. I could buy a GPS module, but those are expensive. I had an old Garmin Forerunner 305 lying around, so I took it apart and took a peek inside. There are two PCBs - one…
geckods
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Suggestions for a program for drawing simple schematics

I'm wondering if there are free programs or web sites that let you draw simple schematics similar to this example:
dlu
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I2C LCD displaying weird characters

I have connected an LCD with an I2C backpack to my Arduino Uno but it prints the wrong characters. The weird thing is that it worked fine for a while and when I updated the code (but didn't change anything to do with the LCD) it started displaying…
Wouter van Dijke
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What's the difference between ICSP vs ISP?

I'm not sure if these terms are interchangeable or not. What's the difference between ICSP and ISP? Is it simply the reset? I've shown two configurations in this question I just asked. Are they both ICSP?
Evan Carroll
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How to have precise measurements

I need to display measurements of a sensor which need to be presented on a precise time-scale. Since the loop function is not quite precise, how can i make sure that i can measure at say for example exactly 1ms? ( I am using an ADXL345 sensor )…
user15977
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3 answers

Problem with serial driver for CH340G board

I bought a USB Nano V3.0 ATmega328 16M 5V Micro-controller CH340G board For Arduino and tried it with Arduino 1.6.6 on my MacBook Pro running OS X 10.11.1 The USB serial could not be seen. I searched on the web and found a few posts about this…
Milliways
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Creating a library for attiny85 out of working program

Apologies if this is the wrong sub-forum, the involvement of ATTiny and arduino places this into a strange category. Please correct me if I should post elsewhere. It is important for this to be a library as small kids will be using this program and…
lukeb28
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Arduino Christmas light project with dimmer

I have an existing project using an Arduino Yun that controls Christmas lights with relays to turn them on/off. There are currently 13 separate rows of lights on the (60 foot) tree, each plugged into a wall wart that's controlled by its own…
chris.nesbit1
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Arduino Power - DC adapter

I have a 12V 2.5 ampere Dc adapter.Can i use it to power arduino uno board? It says on the arduino website that i can use 9-12V and upto 1 ampere. I am concerned with current limit here..
Awais Saifi
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powering the arduino uno

I need to power an arduino uno with a battery but for a very long period of time. And I read a lot of thing about this. Some say do not use a 9V battery with a regulator some other say that it is the best way. SO I am really confused and I need to…
iMadz
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Arduino IDE Based Data Logger - Stops Running

I have created a data logger that writes to a MicroSD on a user defined interval. The data logger also has the ability to use an xBee unit to transmit the data received to a base station. This is a link to the code and pictures of the data…
Alex Bohleber
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Uploading Sketches from Windows Command Line

The resources I've found regarding the Command Line interface seem to be out of date so I was hoping to find someone with experience using it. I'm currently running Arduino 1.5.6-r2 BETA on Windows 8.1 looking to upload code to an Arduino Leonardo.…
Karoly S
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Is there any way I can turn off the 5V pin?

I'm trying to find a way I can toggle the 5V pin to turn on/off. I want the voltage to pass to another wire at a certain point. It should be off and then when something happens, the 5V should turn on. How can I do this?
ninesalt
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