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271  Using Arduino / Project Guidance / Re: XBee querues. on: May 21, 2011, 07:10:05 am
As the XBees - except the new programmable ones - have no logic, you need at least an input (PC, µC or else) to tell the radio modules how/ when to act. XBees have both digital and analog inputs as well as digital outputs (no PWM yet).
For example you can interact with Processing and a connected XBee to your PC and a whole network of other XBees which are standalone.

You can learn a lot in the new book "Building Wireless Sensor Networks" by Robert Faludi.

markbee
272  Using Arduino / Programming Questions / Re: triggering relay at a certain time on: May 20, 2011, 11:46:36 am
look for digitalWrite() and delay();

markbee
273  Using Arduino / Networking, Protocols, and Devices / Re: Using Xbee to implement a wireless network on: May 20, 2011, 01:26:26 am
Hi Raoul,

actually I never tried it but you might try periodic sampling (in API mode) and send the data to your own DH/ DL address. Remember this only works in API mode else the XBee will not send out data to UART.

Maybe you have a look at the data sheet, chapter 8, I/O sampling.

markbee
274  Using Arduino / Networking, Protocols, and Devices / Re: Using Xbee to implement a wireless network on: May 18, 2011, 01:35:43 pm
I can only emphasize this.

O'Reilly has weekdays a "Deal of the Day" for ebooks. Sometimes the Faludi-book is there on sale for abot $15. That's a fantastic bargain.

markbee
275  Using Arduino / General Electronics / Re: Transistor - How to use? on: May 17, 2011, 06:24:00 am
You have to change the value of the series resistor to the IR LED. This is the current limiting factor.

markbee
276  Using Arduino / General Electronics / Re: Transistor - How to use? on: May 17, 2011, 05:18:29 am
...and now you know what a resistor is good for...
277  Using Arduino / General Electronics / Re: Transistor - How to use? on: May 17, 2011, 04:13:37 am
Maybe you can put in a normal red LED (take 330 ohms as resistor) and check the circuit again. It should be working. You get about 4.5mA with 1k resistor to the base, that might be more than enough to drive the LED (it needs about 9mA with 330 ohms).

Pay attention to the wiring in respect to the IR LED (Anode, Kathode) and type of IR LED. I'm not quite sure about that, maybe the hFE for the BD137 is not enough with 4.5mA on the base to drive the IR LED.

How did you measure current and what source did you use (USB) for the Arduino board?

markbee
278  Using Arduino / General Electronics / Re: Transistor - How to use? on: May 17, 2011, 03:40:22 am
Hi,

if you don't measure any current increase this could have different reasons.

It would be easier to answer if you post the sketch and the type of the transistor. How did you calculate the base resistor for the base? Does the IR LED still work (single test with digicam or webcam)?

markbee
279  Using Arduino / Networking, Protocols, and Devices / Re: Using Xbee to implement a wireless network on: May 16, 2011, 05:16:40 am
Go for XBees Series 2 with the coordinator connected by USB to the laptop. Everything else is programming.
280  International / Deutsch / Re: Anfänger - Hilfe bei DS1820 Temperatur auf LCD bringen. on: May 15, 2011, 01:35:16 pm
und jetzt mal den ds 1820 mit ext. spannungsversorgung anschließen, da es ein DS18S20 zu sein scheint.

also pin 1 des ds1820 an GND, pin 2 an pin2 am arduino mit 4k7 resistor und Vdd an +5V Vcc.
281  International / Deutsch / Re: Anfänger - Hilfe bei DS1820 Temperatur auf LCD bringen. on: May 15, 2011, 12:43:17 pm
bitte mal das ds1820 datenblatt lesen smiley-wink

natürlich pin3 vom ds1820 mit GND

im datenblatt steht das alles genau erkärt.
282  International / Deutsch / Re: Anfänger - Hilfe bei DS1820 Temperatur auf LCD bringen. on: May 15, 2011, 12:02:29 pm
ich sehe grade, dass pin3 im parasitären mode bei dir nicht an GND ist. evtl. liegt da der fehler
283  International / Deutsch / Re: Anfänger - Hilfe bei DS1820 Temperatur auf LCD bringen. on: May 15, 2011, 11:40:08 am
85 ist die standard fehler meldung. d.h. es ist etwas nicht iO
gerade der DS18S20 hat probleme mit der parasitären stormversorgung. also einfach mal direkt anschließen
284  International / Deutsch / Re: Anfänger - Hilfe bei DS1820 Temperatur auf LCD bringen. on: May 15, 2011, 11:34:37 am
Ich würde mal versuchen den DS1820 nicht parasitär zu betreiben (also GND an GND, DQ an pin 2 und Vdd an 5 volt).

markbee
285  International / Deutsch / Re: Anfänger - Hilfe bei DS1820 Temperatur auf LCD bringen. on: May 15, 2011, 11:14:51 am
dazu müsste man mal den ganzen sketch sehen
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