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1  Using Arduino / Installation & Troubleshooting / Re: LCD I2C Library interfering with serial? on: September 21, 2014, 04:29:33 pm
Post the code.  The whole sketch.  In code tags, please.
2  Using Arduino / Installation & Troubleshooting / Re: LCD I2C Library interfering with serial? on: September 21, 2014, 04:00:52 pm
Is the LCD I2C or serial (does it connect to A4 & A5 or does it connect to RX & TX)?  How about a link to the LCD datasheet?  Which I2C lcd library, there is more than one?  Define trouble, like no display,  row of black squares, etc. 
3  Using Arduino / Displays / Re: [SOLVED]LCD Liquid Crystal Display Screen only shows squares in top row on: September 21, 2014, 03:04:00 pm
There were pictures.  OP must have removed them or I am dreaming again.
4  Using Arduino / Displays / Re: LCD Liquid Crystal Display Screen only shows squares in top row on: September 21, 2014, 02:03:13 pm
It looks to me like you have R/W connected to the arduino and EN is not connected to anything.  R/W (LCD pin 5) should connect to ground and EN (LCD pin 6) connects to the arduino.
5  Using Arduino / Programming Questions / Re: Turning on multiple relays with space bar on: September 20, 2014, 09:56:23 pm
Single quotes are for single character literals.  '10' is not a single character. 
6  Using Arduino / Project Guidance / Re: Safety Concerns with Lighting with Arduino? on: September 20, 2014, 08:41:06 pm
Be aware that there are electrical codes that must be followed in almost any country, state, etc.  You should study the laws in your locality before you start your project.
7  Using Arduino / Project Guidance / Re: Using I2C on Arduino UNO with Raspberry Pi (as slave) and with other modules on: September 18, 2014, 07:51:26 pm
Can the Pi I2C address be changed?
8  Using Arduino / General Electronics / Re: Need Suggestions for Extending Approximately 40 Wires within 1 larger Wire on: September 18, 2014, 07:39:28 pm
How about flat cable like a hard drive data cable?  IDC (insulation displacement connector) connectors are easy to install and cheap.
9  Using Arduino / Installation & Troubleshooting / Re: Arduino to processing "Arduino cookbook 2nd edition" sketch issues on: September 18, 2014, 02:12:36 pm
Quote
public static final char MOUSE_TAG = 'H';

in the Processing code

Quote
const char MOUSE_TAG = 'M';
in the Arduino code
10  Using Arduino / Project Guidance / Re: Using I2C on Arduino UNO with Raspberry Pi (as slave) and with other modules on: September 17, 2014, 02:41:34 pm
I2C is a bus.  Each I2C device has SDA (data) and SCL (clock) pins.  All of the SDA pins connect together and all the SDApins connect together.  Be sure to have the required pull up resistors installed.
11  Products / Arduino Due / Re: attachInterrupt get interrupted pin on: September 17, 2014, 02:33:45 pm
The external interrupt flag register, EIFR, has a flag for each external interrupt. You should be able to check that register to see which pin caused the interrupt.  Check the data sheet under external interrupts.
12  Using Arduino / General Electronics / Re: help with components for a bike light system on: September 17, 2014, 10:44:44 am
The Nano can easily take care of blinking the turn signals.  No need for relays anywhere as you can drive the lights with MOSFETs controlled by Nano digital outputs.  Pick your LEDs.  Once you know how many LEDs and their current requirements you can specify the transistors and power supply(s).
13  Products / Arduino Due / Re: attachInterrupt get interrupted pin on: September 17, 2014, 10:34:38 am
+1 for a handler for each interrupt.
Take the serial prints out of the interrupt handler(s).  Set a flag in handler and print in loop() when the flag is set.   
14  Using Arduino / Sensors / Re: ADC and SD Card Data Logger Problem on: September 16, 2014, 07:42:10 pm
The sensor datasheet says that normal supply current is 300uA so the 3 are pulling less than 1mA.
15  Using Arduino / Motors, Mechanics, and Power / Re: Any ideas for a "water dripper" on: September 16, 2014, 07:13:53 am
How about a small peristaltic pump.  Their output volume is very precise.
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