Arduino Stack Exchange newsletter

Top new questions this week:

Best way to power an arduino using Vin pin

I have a powerbank rated 5v.The battery is actually 3.6v which is powering the built-in smps to give out 5v. What I am currently doing is that I have stripped one end of the USB cable coming from the ...

power

asked by Bodhisattya Dutta 4 votes answered by Nick Gammon 5 votes

clear Arduino as a global variable in Matlab

I'm trying to use Arduino in Matlab. cause I used Arduino in some function I had to define Arduino as a global variable. clc,clear,close all; global a a = arduino(); . some functions . clear a at ...

matlab

asked by asci 3 votes answered by Niki Dimitrov 0 votes

avrdude: stk500_recv(): programmer is not responding - OSX10.11

I'm getting the following error with a genuine Arduino Uno on Mac OSX10.11 El Capitan when uploading to it (the green light is on, the orange light flashes intermittently while attempting to upload). ...

arduino-uno ftdi programmer

asked by Agent Zebra 3 votes

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 3 votes answered by Tom Carpenter 0 votes

Making an automated watering system with Arduino

I am trying to make an automated watering system using an Arduino. Here is my wiring diagram: And here is my circuit wired up: Here is the code that I'm using with Arduino. The code seems alright ...

arduino-uno programming c++ c code-review

asked by James 3 votes answered by Majenko 3 votes

How to execute commands on Arduino (via PC) without touching the current sketch?

I am working on my first Arduino project. It's a Reverse Geocache. Basically, it's 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 3 votes answered by Nick Gammon 5 votes

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 answered by Amorris 0 votes

Greatest hits from previous weeks:

How can I connect to an Arduino using WiFi?

I'm working on building a solar powered, Arduino based weather station. The weather station consists of a temperature sensor and a photoresistor, and I plan to add an anemometer in the future. I would ...

arduino-uno wifi xbee

asked by jlbnjmn 16 votes answered by sachleen 18 votes

How do I erase the memory of the Arduino Uno?

I'm just a tinkerer learning Arduino with my son and I was surprised that when I plugged the USB cord back in to the Arduino the program was still running and I thought to myself, "it's a good thing I ...

arduino-uno safety flash

asked by Peter Turner 10 votes answered by Manishearth 13 votes

Can you answer these?

Multiple tones with one piezo buzzer

I have figured out how to make a piezo buzzer play two tones at once with analogWrite() and tone() but how would I make an actual song by playing both bass and treble, such as this one. Here is the ...

arduino-uno pwm piezo

asked by Amorris 1 vote

How to create a heart rate detection system that uses a chest strap?

I want to create a system that uses a chest strap from available Bluetooth-based heart rate monitoring systems. The straps seem very convenient compared to available Arduino pulse detection systems ...

sensors

asked by rur2641 1 vote

UART from Arduino to NodeMCU

I'm trying to connect an Arduino nano to a NodeMCU 1.0 via the hardware UART, in order to send information one way from the Arduino to the NodeMCU (and from there to the network). I'm connecting the ...

arduino-nano uart nodemcu

asked by Photon 1 vote