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1  Using Arduino / General Electronics / Looking for recommendations to control a 12V alarm flashlight on: January 29, 2013, 05:01:27 am
Hello!

I have my Arduino based alarm sytem and found a 12v 500mA alarm-flashlight which I would like to use.

Now I have 2 problems here:
1) where do I get the 12 V 500mA from? Battery with step-up? Need a 12 v charger?
2) how do I control this flashlight? Relay?

Can anybodysteer me into a direction?
Idealy with a ready-to-buy solution from some vendor, because I am more the programmer guy and not the solder-iron-savy guy..

Any hints are appreciated.
2  Using Arduino / Programming Questions / Re: Serial message between 2 Arduinos using xbees - receiving garbage on: January 27, 2013, 08:00:00 am
Thanks for your hint on checking the baudrate.

In the Softwareserial description I found:
" It is possible to have multiple software serial ports with speeds up to 115200 bps."
So I thought I was ok... but:

Nevertheless I changed by baudrate down to 9600 and it solved my problem. Strange though.
3  Using Arduino / Programming Questions / Re: Sending several integers through serial on: January 26, 2013, 04:00:25 pm
Hi.

I am having a similar issue.Have a look at this post, especially the parsing part:
http://arduino.cc/forum/index.php?topic=88647.0

Maybe this helps..

I am very interested in your code with just one value being transmitted. Could you post it here or maybe in my question thread:
http://arduino.cc/forum/index.php/topic,145137.0.html
Thanks!
4  Using Arduino / Programming Questions / Serial message between 2 Arduinos using xbees - receiving garbage on: January 26, 2013, 03:03:28 pm
Ladies and Gents,

I am stuck with this little issue and searching could not help either.

I have a setup of 2 Arduinos connected with xbees.
The sending Arduino is sending this message every 5 seconds:
<1>
<2>
<3>
etc.

Code:
int MeasurementID = 1;
...
Serial.print("<");               // Start Char
Serial.print(MeasurementID);
Serial.print(">");           // end char
MeasurementID++;
...

The receiving Arduino is using this code:
Code:
void setup() {
   Serial.begin(57600);    
   mySerial.begin(57600);}

void loop() {
  while(mySerial.available() > 0) {
    char inChar = mySerial.read();
    Serial.print(inChar);
  }
}

On the serial monitor I receive this:
<‘œ˜Ÿ
<<±œšŸ
etc.
Basically the first char of the message is correct then I receive garbage.

Can anybody tell me why I recieve this?
5  Using Arduino / Installation & Troubleshooting / Re: FIO Gives Serial garbage on XBee after waking up on: January 10, 2013, 07:03:17 am
I also have exactly the same issue here.
If anyone has solved this please share.

6  Using Arduino / General Electronics / Re: Power supply for arduino and several boards using one adapter on: August 02, 2012, 09:46:56 am
Ok, I realiseI  can use 5v external supply for the Arduino as well. I was reading about the recommended 6v-12v.
Ok then I have no problem:)

As for the adapter I will use a normal one:
e.g. in UK
http://www.amazon.co.uk/LINDY-2-5mm-Country-Switching-Adapter/dp/B005NF4C7O/ref=sr_1_9?ie=UTF8&qid=1343918592&sr=8-9

I believe this to be sufficient, because all current numbers are for peak levels. So I am 250 mA short if all boards peak at the same time. I will give it a try.
7  Using Arduino / General Electronics / Power supply for arduino and several boards using one adapter on: August 02, 2012, 01:05:49 am
Good morning !

I have a project that involves 3 boards and I want to power them up using a single power source (that I will buy, dont have it yet):

1) Arduino Uno: 6-12 Volt recommended, lets say 250mA
2) GSM modem board, 5V, 2A in peaks (!)
3) Raspberry pi, 5V, 1A

It there a way to power them all using one adapter?
And is there a ready to buy solution to take care of the voltage difference for the Arduino?

Whats your experience?
8  Using Arduino / General Electronics / Re: Reed switch closed in 99.9% of time - how to setup on: August 02, 2012, 12:56:01 am
Thanks to everybody for sharing their advice!

It took me a few days to try it all out but now it works like a charm. 
9  Using Arduino / General Electronics / Re: Reed switch closed in 99.9% of time - how to setup on: July 25, 2012, 03:10:05 pm
Thanks for all your answers!

@Magician: I am not fully understanding your suggestion although I read about the internal pull-up resistor.
If I wire the reed switch between a pin set to input with activated pull-up and Ground on the other side: How Do I read the switch state?
Could you elaborate a bit more?

10  Using Arduino / General Electronics / Reed switch closed in 99.9% of time - how to setup on: July 25, 2012, 11:48:26 am
Hello!

This might be a simple questions but it bothers me and I could not find an answer:

I have a simple reed switch, that is closed in normal state (door closed) and open when the door opens.
That mean in 99.9 % of the time the switch is closed.

Can I simply hook it up to a digital pin and VCC  of the arduino (of course including the usual pull-down resistor) and have it read by the software (digital read)?

Or will I setup a situation where all the time a significant amount of ampere will flow (due to the closed circuit in 99.9% of the time)?
Is this setup smart?


any hints will be appreciated.

Best regards!
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