Community Digest

Top new questions this week:

Confusion re: getting bootloader onto new-out-of-the-box Nano v3.0 (classic)

I've been trying to do a sort of "crash course" in Arduino but there's something I'm still confused about. I've read about programming ATTiny microcontrollers using Arduino boards, and I've ...

arduino-nano bootloader  
user avatar asked by BirdsInMyBrain Score of 1
user avatar answered by Nick Gammon Score of 1

AREF pin on Arduino Uno R3

edit So then, AREF can only output a voltage when used by the ADC, but not when used by the AC. That is what I sense all your answers are pointing at, yet none has it black on white. My questions ...

arduino-uno adc analogreference  
user avatar asked by kellogs Score of 1
user avatar answered by Edgar Bonet Score of 4

Re-using built-in USB port to charge battery

I'm dipping my toes into using LiPo batteries for supplying power to small devboard projects, currently with an LOLIN S2 mini. So I got hold of a MH-CD42 module, which seemed like a safe way to start ...

battery lipo charging  
user avatar asked by macroController Score of 1
user avatar answered by Greenonline Score of 1

Greatest hits from previous weeks:

Why is my LCD 16*2 is not displaying any characters, although all the wiring is correct?

Recently I have linked up a typical 16*2 LCD (Liquid Crystal Display) display to my Arduino Uno and have linked all the pins up. Here is my connection:(LCD pin first) 1=GND, 2=+5v, 4=11, 6=12, 11=5, ...

arduino-uno programming pins lcd  
user avatar asked by Stratmoss Score of 11
user avatar answered by PhillyNJ Score of 7

I2C LCD Serial Interface Board not displaying text (wrong pins?)

I have a 1602 LCD screen that works fine on its own. However I wanted to free some pins by using an I2C / IIC LCD controller I purchased separately. While the controller seems to be communicating ...

i2c lcd  
user avatar asked by Bort Score of 9
user avatar answered by Anonymous Penguin Score of 3

Use all pins As digital I/O

Increase the number of digital pins There are many post that explain how to use more than just the standard pins on the various arduinos but none of them explain the limitations and the proplems ...

arduino-uno serial pins  
user avatar asked by cocco Score of 15
user avatar answered by Majenko Score of 13

What is Serial.begin(9600)?

I know that this is to initialize something: Serial.begin(9600); But I want to know what it really means?

arduino-uno serial  
user avatar asked by shajib0o Score of 28
user avatar answered by heypete Score of 25

What can I do if I run out of Flash memory or SRAM?

According to the Arduino documentation, the ATmega328 has 32KB of Flash memory for the bootloader + uploaded sketch, and only 2KB SRAM for runtime data. The ATmega2560 has quite a bit more, totalling ...

flash sketch-size  
user avatar asked by Peter Bloomfield Score of 30
user avatar answered by Peter Bloomfield Score of 32

Mac OSX Yosemite no serial ports showing for Uno R3

I have a MacBook Pro running OS X Yosemite (10.10.3). I connected my Arduino UNO R3 to my computer for the first time after the Yosemite upgrade - it worked fine before this! When I opened the ...

arduino-uno usb  
user avatar asked by revive Score of 47
user avatar answered by Tensho Score of 44

How to change baudrate of ESP8266 (12e) permanently?

IMPORTANT: DO NOT USE AT+IPR=9600! (see update) I have an ESP8266 12E module that communicates at 115,200 bauds. Since I use it with an Arduino Nano with SoftwareSerial things get messy. So I found ...

arduino-nano esp8266 firmware baud-rate  
user avatar asked by mvermand Score of 15
user avatar answered by mvermand Score of 5
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