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Top new questions this week:

Collection of functions for arduino IDE

I am having troubles creating a collection of functions to be used in Arduino sketches and libraries. What I want is not a class, but simply a group of functions which do not require an object to be ...

library ide

asked by tomph 5 votes answered by Majenko 6 votes

How is the bootloader activated when device is running?

For the sake of specificity I am referencing my question to Arduino. It applies to all AVRs with hardware USB and a bootloader though. The bootloader is capable of receiving new program data over the ...

Powering Arduino with reverse car lights?

I'd like to build a reverse car sensor using Arduino When we select reverse gear, the reverse lights powers, so we can take electricity from them. My question is can i power my Arduino directly from ...

arduino-uno

asked by Man Man 3 votes answered by Majenko 3 votes

Arduino beginner question

I just got a new pro-micro Atmega32U4 board, and installed the current Arduino IDE (1.8) and cannot get it working. There is no entry for a pro-micro, so I chose Leonardo as it uses the same chip. ...

bootloader

asked by ctrl-d 3 votes answered by Celary 2 votes

Hardware logic gates for a simple demo with LEDs

I need some logic gates for a simple demo like this one. I will use a regular breadboard and an Arduino UNO as a 5 V and GND supply. I found these ICs from Texas Instruments SN74LSxxN (NOT, AND, OR, ...

arduino-uno electronics

asked by GeMir 1 vote answered by Nick Gammon 1 vote

How to execute commands on Arduino (via PC) without touching uploaded sketch

I am working on my first Arduino project. Its a Reverse Geocache. Basically, its a puzzle where a battery powered Arduino is mounted inside a locked box, and is able to unlock the box if the user ...

servo sketch tinygps

asked by Laurence 1 vote answered by Nick Gammon 1 vote

Port Manipulation and serial communication

i'm working on a laser timer using arduino and i saw that using direct port manipulation can have a really better time precision. My only concern is about serial communication, because i am using some ...

softwareserial timers port-mapping

asked by user117043 1 vote

Greatest hits from previous weeks:

Is there a way to have more than 14 Output pins on arduino?

Is it possible to have more than 14 output pins on the Arduino, I am working on a project in which I need to light up several LEDs individually. I only have an Arduino Uno, and I don't want to get a ...

pins arduino-uno

asked by JVarhol 38 votes answered by Ricardo 39 votes

Parse JSON with arduino to turn on LED

Hi i'm trying to parse JSON resposne from webserver in my arduino in order to turn on and off a LED light. I'm using the wifi client repeating example to make a get request to my server: ...

arduino-uno shields wifi

asked by user1424508 14 votes answered by sachleen 8 votes

Can you answer these?

Play music with an buzzer by Matlab

I'm trying to play a tone with a buzzer on Matlab. there are a lot of example of music for Arduino IDE but I can't find any helpful example in Matlab by the way I've tried this code to play music ...

sound matlab

asked by asci 1 vote

RFID reader for unknown tag 125kHz

I have a unknown RFID tag and try to read his value. I bought two readers RDM6300 125KHZ and RC522 13.56MHz. Each of the readers connected to arduino works well with the purchased corresponding tags, ...

rfid

asked by Honzík 1 vote