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226  Forum 2005-2010 (read only) / Interfacing / Re: Cheap sound chip with eeprom on: May 24, 2010, 02:15:41 pm
Thanks, those are exactly what I was looking for.
227  Forum 2005-2010 (read only) / Interfacing / Cheap sound chip with eeprom on: May 22, 2010, 01:48:51 pm
Anyone happen to know cheap ICs that can store and play short audio samples? Like the ones in children's toys that  plays those awful noisy sound effects. Sound quality don't have to be good and a half dozen samples a few seconds each is enough.
228  Forum 2005-2010 (read only) / Interfacing / Re: Can I run a 12v fan off Arduino or sensor shield? on: May 08, 2010, 01:32:08 pm
The fan will probably rotate on 5V, but digital out almost certainly can't handle the current the fan would draw, at least not when the fan starts up. If Arduino is powered from USB,  you can draw a few hundred mAs from Arduino's 5V pin, if that's enough for the fan. You need some additional electronics, e.g., a transistor and resistor to switch the power to the fan.
229  Forum 2005-2010 (read only) / Interfacing / Re: how to choose a suitable relay? on: April 21, 2010, 12:59:45 am
Am I right to assume that a waterpump is resistive?

No. Water pumps have motors and as  brtech said above, that is not resistive, but inductive load. However, if your pump draws 5W@230V, current will be well below 5A.  
230  Forum 2005-2010 (read only) / Interfacing / Re: what basic stuff to buy for a electronic hobbyist on: December 17, 2009, 09:28:20 am
Solderless breadboard is a must. Timers, e.g., LMC555 and shift registers may be also useful.

231  Forum 2005-2010 (read only) / Interfacing / Re: My next project: laundromat watcher! on: October 27, 2009, 02:19:27 pm
My 2nd project with the Arduino is going to be something that watches the washers/dryers in my laundromat, and the computer will monitor the serial port to see when a washer/dryer has started/stopped and update a website accordingly.

My wife just asked earlier today wouldn't it be possible to receive an SMS when the laundry is ready  smiley-grin Let us know how your project goes on.
232  Forum 2005-2010 (read only) / Interfacing / Re: What would I need to build a bitcrusher? on: December 12, 2009, 06:15:06 am
I've got two problems. First, the Arduino only has 4-bit A/D conversion.

Actually, the Arduino has 10bit A/D conversion.
233  Forum 2005-2010 (read only) / Interfacing / Re: xbee question on: December 10, 2009, 03:45:43 am
the IR angle is 17 degrees. is that too narrow?
For transmitter (shooting end) that is probably too wide. I think you can easily narrow the angle by placing the transmitting led inside a tube  (the gun barrel). Deeper inside the barrel => more narrow angle.
234  Forum 2005-2010 (read only) / Interfacing / Re: Serial LCD for arduino on: December 05, 2009, 07:15:40 am
I bought this one from DigiKey. It only cost about 18$. It is ridiculously easy to use. It only need three wires: +5V, GND and one digital out pin. No need to hassle with backlight/contrast pots, everything is programmatically. I used NewSoftSerial library with it.
235  Forum 2005-2010 (read only) / Interfacing / Re: XBee as standalone sensor/actuator on: November 16, 2009, 09:33:41 am
Thanks a lot for replying! Now I am not going to waste money for buying wrong kind of XBees.

Actually, the XBee module is not a sensor, but, if a sensor supplies it a value, the Xbee can transmit it.
Yes, I understood that. I am going to plug a current sensor in it in order to find out if some electrical device is on or off.
236  Forum 2005-2010 (read only) / Interfacing / XBee as standalone sensor/actuator on: November 16, 2009, 07:32:09 am
I got the impression that  stand-alone XBee modules can be used as sensors (transmitting Analog/Digital input values to another XBee) and  actuators (driving digital out HIGH/LOW according to commands it receives from another XBee). I am planning to use several standalone  XBee modules as sensor/actuator slaves and one master XBee connected to an Arduino. Stand-alone means here that XBees are not phycially connected to MCUs. Analog/Digital inputs are connected to sensors and digital outs drive relays

Do all Xbee modules support this kind of sensor/actuator functionality, or should I pick up some spesific models?
237  Forum 2005-2010 (read only) / Interfacing / Re: Variable length input from keypad on: November 14, 2009, 07:25:10 am
As a work around I'm using int(key-48) which returns the correct value, but is there a better way to do this?

The way you figured out yourself is perfectly good way  to convert numbers from ascii charaters to integers.
238  Forum 2005-2010 (read only) / Interfacing / Re: Comminication between Arduinos  - powerline or RF? on: November 13, 2009, 05:59:00 am
Opps.  At first I thought you had ethernet at the coffer maker. Now I see you were talking about eth over powerline.

Ethernet over powerline was just one example of possible ways to communicate between Arduinos, although probably too expensive and compicated for my needs.  I am just looking for simplest possible way (excluding additional cabling) to send the status of an electric device to the master and swich the device off/on by a command from the master.

239  Forum 2005-2010 (read only) / Interfacing / Re: Comminication between Arduinos  - powerline or RF? on: November 13, 2009, 04:19:56 am
How does one send information via the AC wiring?

There are several ways to do that. One of the most widely used is X10 protocal. It sends a bit every time when AC voltage crosses zero, so it is very slow and has also quite limited functionality. More advanced solutions include ethernet over powerline (HomePlug) and PLC-UART (serial over powerline). Google will give you more info about those.
240  Forum 2005-2010 (read only) / Interfacing / Re: Comminication between Arduinos  - powerline or RF? on: November 12, 2009, 03:49:53 pm
Thank you all for excellent suggestions. I should have made more clear at the beginning that I don't want to add extra cables. One requirement is that the control/monitoring apparatus is easy to move from one place to another.

You could probably replace the slave Arduino with an XBee which has analog measurement and digital I/O capabilities.
I will definitely check that one.

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