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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 4 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

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

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 ...

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

Greatest hits from previous weeks:

Arduino Pro Micro, get data out of Tx pin?

I have a Sparkfun Arduino Pro Micro with an ATmega32u4 on it and a Roving Networks RN32 Bluetooth Module Theoretically, I should be able to solder the Rx of the Bluetooth to the Tx on the arduino and ...

serial arduino-pro-micro

asked by user3320919 2 votes answered by Chris Stratton 10 votes

How to toggle LED on button press?

I want to have a LED turn on when I push a button and go off when I push the button a second time. This code doesn't work: const int buttonPin = 4; const int motorPin = 10; const int ledPin = ...

button

asked by Julian Köberle 1 vote answered by Peter Bloomfield 5 votes

Can you answer these?

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

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

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