Arduino Weekly Newsletter - Wednesday, April 29, 2015

Arduino newsletter

Top new questions this week: What is the best way to define an I/O pin? I read definitions like const int ledPin = 9; and also #define ledPin 9 I know that a definition like int ledPin = 9; is a bad practice if you're not going to change it (which you usually ... programming   asked by Joris Groosman 5 votes answered by Srinag Rao 7 votes Level tracking using optical or capacitance sensors I am looking to devise a level tracking system using arduino and some sensors. My particular situation is I have solute that is coming out of solution and I want to track the formation rate of the ... arduino-uno sensors   asked by TheCodeNovice 2 votes How can I best control various high power LEDs without using PWM I want to be able to dim various high powered (20mA) LEDs in an array (8X12 LEDs). I do not need individual control, but would like to be able to dim each row (or two rows together) so that I can ... led potentiometer   asked by Uli 2 votes answered by jwpat7 1 vote My button control working in reverse I built this circuit to learn button control. But my code (or button) is working in reverse. I want to initialize led flash effect when the button is pressed with this code buttonState = ... arduino-uno button   asked by wizofwor 2 votes answered by Gerben 0 votes Proportional water flow control I've been looking at water flow control with Arduino and I'm finding a huge difficulty in managing to do an 'analog' control on water flow. The mainstream solution seems to be the well known solenoid ... arduino-uno motor   asked by Arengorn 2 votes answered by jdr5ca 3 votes Is it harmful to write to unused bits in PORT registers? Background: I'm looking at writing a library to drive an LED matrix panel (one of these:http://www.adafruit.com/product/607) from my newly acquired Arduino Due. My background is C++ programming, not ... arduino-due   asked by Mick Waites 2 votes answered by Majenko 2 votes Why does the pin 2 of arduino Mega stay always HIGH? Without declaring the pin 2 as INPUT or OUTPUT, it remains constantly HIGH. Can anyone explain why is it so? arduino-mega   asked by explorer 2 votes answered by Joris Groosman 1 vote Greatest hits from previous weeks: Can I program for Arduino without having a real board? I would like to start the development of some basic Arduino projects but I don't own an Arduino board yet. Is there a way I can write my code and emulate/test it using a desktop computer so after my ... emulation testing   asked by totymedli 49 votes answered by Anindo Ghosh 35 votes I2C 2 way communication between Arduino Uno and Arduino Mega if I remove the transmission code from slave this works properly but I need to transmit from slave. Here is my master code #include <Wire.h> void setup() { Wire.begin(3); ... avr i2c   asked by srinivas 2 votes answered by Wayne 4 votes Can you answer these? How I could make a bus connection in a prototype shield? I am a programmer but pretty new to electronics , I recently bought a prototyping shield like the picture : In my view there is no bus connections here . I have lots components need connect to ... arduino-uno arduino-mega shields   asked by Yank 1 vote send SMS for 1 time with arduino GPRS SIM900 if an iput is HIGH I faced a problem to send 1 SMS if an input is HIGH,and if it is LOW==> no SMS to send,if LOW to HIGH==> send 1 SMS. this code not working,just sent SMS when I turn the GPRS on,and after nothing is ... arduino-uno gsm c   asked by Tariq Talbi 1 vote Sending values to an Arduino Yun across different networks I have quite a lot of experience with Arduino but have recently been faced with a challenge that has stumped me. The project is to create a robot that can be controlled from a separate network than it ... wifi arduino-yun remote-control   asked by Omer Eldar 1 vote

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