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1  Using Arduino / General Electronics / Re: Open Collector - Input digital signal on: September 27, 2011, 02:17:23 pm
The pir is wireless and connects to the receiver.

http://cpc.farnell.com/jsp/search/productdetail.jsp?SKU=HK00444
http://cpc.farnell.com/jsp/search/productdetail.jsp?SKU=HK00442

The receiver requires a 12v supply. I was going to use same supply which supplies the arduino. I have a 12v 2a power supply. This would mean ground is common.

So the open collector from the receiver on the diagram would connect direct to the input pin on the arduino ? (within internal pull up resistor on)
2  Using Arduino / General Electronics / Open Collector - Input digital signal on: September 27, 2011, 11:10:48 am
Hi,

I have a wireless receiver board with 4 channels (for wireless PIR). This as open collector outputs. See attached diagram.

Is it safe to wire these direct to the arduino digital inputs. I want to avoid using relays. Would using an opto coupler be better.

Any advice would be appreciated.

Thanks
Steve
3  Using Arduino / General Electronics / Re: Interface to existing alarm system on: September 08, 2011, 06:47:52 am
Yes its low voltage. Need to check the voltage.

I thought of a relay but I have 5 zones so would need to 5 relays.

I have attached a circuit diagram. Would this work OK ?
4  Using Arduino / General Electronics / Interface to existing alarm system on: September 08, 2011, 04:07:53 am
Hi,

I have an existing wired alarm system and wish to interface it to my Arduino.

The zone is a normally closed circuit which opens when the sensor is activated. I would like to keep the existing alarm system working but have the zone inputs going to the Arduino as well.

Not sure how I could wire this safely.

Any help would be appreciated.

Steve
5  Using Arduino / Programming Questions / Cellular Shield get network time on: August 28, 2011, 09:14:44 am
I have just ordered the Cellular Shield with SM5100B.

I wondered if it was possible to set the time on the Arduino from the cellular network. This would save adding an RTC to my project.

6  Using Arduino / Programming Questions / Re: USB Serial Adapter on: August 24, 2011, 01:07:44 am
Thanks.

I already have a ftdi cable 3.3v. However this does not work. I think I need the 5v version.
7  Using Arduino / Programming Questions / USB Serial Adapter on: August 23, 2011, 04:07:43 pm
Does anyone know where I can but the USB serial Adaptor (http://arduino.cc/en/Main/USBSerial) in the UK.

I want to use this to program a Ethernet with POE (http://arduino.cc/en/Main/ArduinoBoardEthernet)


8  Using Arduino / Programming Questions / Re: Ethernet with poe sketch upload problem on: August 20, 2011, 01:01:20 pm
I have tried it with 9v battery connected to the board with same results.

The hardware spec clearly states I can use a ftdi cable to program the unit.

"Arduino Ethernet - This board contains an ATmega328 microcontroller and the same ethernet IC used on Ethernet Shield. You need a FTDI cable or a USBSerial adapter to program the ATmega328."

Can anyone suggest anything else to try.
9  Using Arduino / Programming Questions / Re: Ethernet with poe sketch upload problem on: August 20, 2011, 10:47:09 am
I am using a 3com poe power supply. This has 2 ports, one back to the switch and the other to the device injecting the power onto the cat5 cable. The board powers up of the poe ethernet connection without anything else connected.

I am assuming this would supply the required 5v without connecting anything to the vin pin.
10  Using Arduino / Programming Questions / Re: Ethernet with poe sketch upload problem on: August 20, 2011, 10:03:13 am
Won't the poe connection power the board or do I have to connect a separate 5v supply to vin. Going to try a 9v battery on the 2.1mm connection.
11  Using Arduino / Programming Questions / Ethernet with poe sketch upload problem on: August 20, 2011, 05:36:51 am
I have just started with ardunio. I have bought a uno and the ethernet with poe (not shield).

I can program the uno no problem with the usb cable.

I cannot upload a sketch to the ethernet verison. I have purchased a ftdi cable from http://www.oomlout.co.uk/usb-serial-cable-33v-p-232.html

Using Windows 7 64bit with version 22 and latest drivers for ftdi cable.

However when I uploaded the sketch I get the following error. Used the new boards.txt file from http://arduino.cc/en/uploads/Main/boards.txt I have checked I am using the correct board and port in tools menu.

avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

Checked out the post http://arduino.cc/forum/index.php/topic,67777.0.html and several other posts.

I have powered the board over the POE port and connected the ftdi cable. The board lights up with just the ftdi cable or just the poe or with both connected. I don't have anything powering the 2.1mm jack. I assume the board can be powered in several different ways.

Do I need to use a separate power supply to power the board when uploading ? Another post said I need to supply 5v to the Vin pin. How would this be wired ?

I can find very little information on this board (examples etc) I assume because it so new.

Any guidance would be appreciated


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