Arduino newsletter

Top new questions this week:

Trouble when avoiding delays

I am new to Arduino and I am learning how to avoid using delay. I have written some code to move my servo by 20° using delays, but can only move the servo once with my current code. In setup(), I ...

arduino-uno

asked by Corey 5 votes answered by Michael 7 votes

How can I load fonts into Adafruit GFX for TFT display (ILI9341)

I get a compile error when I try to set a different font in Adafruit GFX on a TFT display on my Arduino Uno. I'm testing a new TFT shield for Arduino equipped with an ILI9341 by using the Adafuit GFX ...

arduino-uno adafruit

asked by pschalkx 3 votes answered by pschalkx 2 votes

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 ...

gps

asked by geckods 3 votes answered by Dmitry Grigoryev 2 votes

Power Supply Problem with Arduino Yun: Using a log USB cable

I want to use an Arduino Yun as a kind of outdoor weather station. I want to supply the power for the Yun with a 5V USB-Charger. Using a normal USB cable everything works fine. But as the weather ...

power arduino-yun usb

asked by bhneuner 3 votes answered by Dmitry Grigoryev 2 votes

What is the Maximum Current an Arduino can Supply?

I was wondering how much my Arduino I/O pin can output when it is set at Output and is at High. I am using an Arduino Uno R3. Thanks in Advanced.

current input

asked by Bryan 3 votes answered by bigjosh 4 votes

Why does my Arduino freezes when i turn a servo

I have a Servo Motor and an Arduino Uno. I used the Arduino to run a servo motor. The code was very simple. It was to just Turn it 90 Deg Anti-Clockwise when a switch is pressed and Turn back to its ...

servo

asked by Bryan 3 votes answered by user96384 2 votes

What is the memory expense of creating a String from a char array?

I'm writing a little API for processing email messages in Arduinos. Obviously, I need to keep memory use down, but I also want to allow the end user to use the String functions (like indexOf) to ...

c++ string memory-usage

asked by Etienne 3 votes answered by slash-dev 4 votes

Greatest hits from previous weeks:

How to check my Arduino board is working or dead?

When you have a board in your hand but you don't know is it working or not, how to verify if it's working or dead?

arduino-uno testing

asked by Hardik Thaker 9 votes answered by Hardik Thaker 10 votes

Can I program for Arduino without having a real board?

I would like to start the development of some basic Arduino projects but I don't own an Arduino board yet. Is there a way I can write my code and emulate/test it using a desktop computer so after my ...

emulation testing

asked by totymedli 74 votes answered by Anindo Ghosh 53 votes

Can you answer these?

Multi-drop RS485 device control v1.0 - why is limit for "TIME_BETWEEN_MESSAGES "?

I am going to use Nick's rolling-master system library (http://www.gammon.com.au/forum/?id=11428) in my home project. For first experiments and testing, I have: - BAUD_RATE = 9600 - max adress = 2 ...

networking timing rs485

asked by vava 1 vote

panstamp device signature is random

I Have 2panstamp. I can program the first but not the second with the arduino program. When I upload the sketch (a simple blink) on the second, I got this Reading | ...

rf

asked by Thanatheos 1 vote

Can an Arduino Processor act as a GATT Server (Bluetooth LE)

I know it's pretty standard to set up an Arduino system as a BLE client, and use something like an app running on a smartphone as the GATT server, that receives the data and does something with it. ...

bluetooth

asked by Tom Auger 1 vote