Arduino newsletter

Top new questions this week:

Is it possible to upload previously compiled binary?

I have a number of sketches that I keep wanting to load into the Arduino but I don't necessarily need to recompile them because I haven't changed anything since the last compile. Since the compile ...

uploading ide

asked by Lefty 4 votes answered by 25mhz 6 votes

Do I use 3,3V or 5V, when device supports both?

I have a general question regarding the power-supply of the electronic components, that are attached to an Arduino. If I have a device that operates at voltages between 3,3V and 5V (e.g. this RS232 ...

power voltage-level

asked by Michael B 4 votes answered by Marla 6 votes

Connecting arduino to an existing circuit

I have a little clock with a button on it that i need to push four times every second hour. I am trying to get the arduino micro to do it for me. I am trying to figure out how to connect the arduino ...

arduino-micro

asked by lobirkeland 3 votes answered by Chetan Bhargava 0 votes

Since double and float represent the same data type (usually), which is preferable?

It looks like on ATMega based boards, float and double are equivalent 32-bit (4-byte) data types. However, on the Arduino Due, doubles are 64-bit (8-byte) where floats are 32-bit (4-byte), same as ...

programming arduino-ide avr data-type

asked by Ehryk 3 votes answered by Nick Gammon 2 votes

Double ## in macros

I was looking at some macro use in an Arduino code. I believe what this macro does is it expands into a state that basically sets a pin to either input or output, but I'm a little confused about ...

programming pins sketch

asked by Sebastian Freeman 3 votes answered by Majenko 4 votes

Arduino Mega And L298N Motor Driver Board (Controlling using AccelStepper Library)

Can someone help me how to use AccelStepper library in setting the origin position of the stepper? We are using a tact switch and an L298N driver for the stepper motor in setting the origin of the ...

arduino-mega motor library

asked by jaylongkit 3 votes

Are there sensors that can detect the color of an LED?

Are there sensors that can detect the color of an LED? I am working on an Arduino project that needs to detect the color of an LED on an external device. I am trying to identify a light sensor that ...

sensors led

asked by mangotang 3 votes answered by linhartr22 1 vote

Greatest hits from previous weeks:

Difference between Arduino.cc and Arduino.org

Recently I have noticed that there are two arduino sites, arduino.cc and arduino.org. They both have the Arduino logo and both sell what seems to be official Arduino boards. Also, arduino.org came ...

hardware

asked by NULL 12 votes answered by Ignacio Vazquez-Abrams 15 votes

Very long delay() possible?

I'm trying to make an opening and closing little door that should open or close every 12 hours. I was wondering if I could just make a small looping script with a delay() for 12 hours, delay(43 200 ...

arduino-uno timers

asked by Fred Pannekoek 6 votes answered by geometrikal 7 votes

Can you answer these?

Select which XBee router will receive data

I am working on a project which has one Coordinator XBee and 2 Router Xbees. Now, following a condition which will be defined by code in MATLAB (Yes/NO condition), I want the XBee router 1 to receive ...

arduino-uno xbee

asked by Shantanu Jagtap 1 vote

Arduino uno + cnc shield v3 + Stepper Motor Driver A4988 + AccelStepper?

I successfully run the AccelStepper examples on an Arduino Mega with a RAMPS 1.4 shield, two A4988 stepper motor drivers and two 17HS16-0284S stepper motors. I used 3 jumpers on the RAMPS to set the ...

arduino-uno programming motor shields stepper

asked by arthur.sw 1 vote

Daikin Remote ARC

I started off attempting to use the IRRemote Library and a VS1838B Sensor to capture the Daikin air condition signal. I’ve read about the timing and in all honesty, I don’t think I can do it on ...

remote-control

asked by eezetee 1 vote