Arduino newsletter

Top new questions this week:

Is there a non-float alternative to pow()?

I've scoured the LANGUAGE REFERENCE in the Arduino web-site (https://www.arduino.cc/en/Reference/HomePage), and I can't find a non-Float equivalent to pow() I've got to be missing something big, but ...

variables float mathematics

asked by VIC-20 8 votes answered by Jason Clark 7 votes

7 Segment display dimming

I've got project that needed to have some (4) digits display, and had plenty of 7 seg. displays lying around. I didn't have any multiplexers left but have instead wired it up as per this diagram: ...

transistor arduino-duemilanove 7-segment

asked by Shane Gadsby 5 votes answered by Milliways 2 votes

Sound Recognition

I'm looking to recognize a particular sound using arduino uno. I need to recognize a clap sequence to trigger a relay. Having given it some thought i need it to be continuous listening mode with out ...

arduino-uno sound

asked by Ajay Free 3 votes answered by Michael Stachowsky 1 vote

Arduino not running the sketch with external power supply of 9v, but runs the program when connected to pc

Can anyone please help me figure out/ point the reason of this arduino problem? I uploaded a simple arduino sketch (blink an LED ) just to test if my real program was the reason of the "abnormality" ...

arduino-uno programming

asked by Ellimenopy 3 votes answered by dpw 1 vote

How can I use stepper for specific degree?

I use Arduino and I'm beginner. I use the code below, but I don't understand what stepper.step(num) and STEPS in Stepper stepper(STEPS, 2,3,4,5) are, and I want to use stepper for specific degree and ...

stepper

asked by ReD 3 votes answered by dpw 4 votes

Running quartz clock off an arduino

I am trying to run a clock off of an arduino following this site: http://www.cibomahto.com/2008/03/controlling-a-clock-with-an-arduino/comment-page-1/ and I tried to combine it with this to get it to ...

arduino-uno oscillator-clock

asked by Coolcrab 3 votes answered by Edgar Bonet 2 votes

Detailed analyse of memory usage

When compiling a sketch, after linking, the build outputs a kind of forecast on RAM usage, e.g.: Minimum Memory Usage: 1456 bytes (71% of a 2048 byte maximum) Is it possible to somehow get a ...

memory-usage

asked by jarnbjo 3 votes answered by Edgar Bonet 4 votes

Greatest hits from previous weeks:

What is commonly done to stop a servo after reaching desired position?

When I started Arduino, I did not expect that everything must be contained in an infinite loop. I thought I could just write something like: motor start -> motor stop. But in actuality, what I get is ...

servo

asked by Beached Whale 5 votes answered by jdr5ca 8 votes

Is using malloc() and free() a really bad idea on Arduino?

The use of malloc() and free() seems pretty rare in the Arduino world. It is used in pure AVR C much more often, but still with caution. Is it a really bad idea to use malloc() and free() with ...

programming sram eeprom

asked by Cybergibbons 25 votes answered by JRobert 20 votes

Can you answer these?

Board.txt configuration change Atmega328p

Hi I am trying to configure an Atmega328p to run with an 8MHz oscillator in part to reduce power consumption and so I don't need to have level shifters all over my project. I have changed the ...

arduino-uno atmega328 arduino-pro-mini

asked by Danny J 1 vote

Send and Read packet xbee AT mode

I have a simple network created using Xbee series 2 devices. My network is very simple, my end-device with Arduino UNO read a temperature and Lightning, display this value into LCD and send using Xbee ...

arduino-uno serial communication xbee

asked by user3836982 1 vote

Problem with sending a POST request using the WiFiEsp library

I'm using an ESP8266 version 1 with the WiFiEsp library to connect to WiFi, and that works just fine. I'm setting up the device using the same code as in the example WebClientRepeating. I need to ...

arduino-uno esp8266 web

asked by Øyvind Bråthen 1 vote