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16  Using Arduino / Motors, Mechanics, and Power / Re: How to reliably calculate power? on: November 06, 2013, 01:54:20 pm
if you don't have a multi meter to measure the current,

have a go with a 9v battery, see how long it lasts.

generally,
    with a standard UNO, a 9v battery is not going to last long,
          your probably going to want to look at things like the tiny, and look at how to program for low power, sleep states et all.

qed: not easy , if you have to ask how to do it, dont try unless you want to learn.
    just go with a PSU if you can.

and out of interest, the rugged UNO has a DCDC power supply.
17  Using Arduino / Motors, Mechanics, and Power / Re: Wall Climbing robot using suction. Need help in understanding the specs. on: October 27, 2013, 11:50:29 am
this might be interesting

http://gadgetshow.channel5.com/gadget-show/videos/challenge/superheroes-part-four

18  Using Arduino / Motors, Mechanics, and Power / Re: Getting information from power supply on: October 23, 2013, 02:19:18 am
will this help

http://electronics.stackexchange.com/questions/36517/opto-isolated-arduino-input
19  Using Arduino / Motors, Mechanics, and Power / Re: Getting information from power supply on: October 22, 2013, 12:37:53 pm
opto is the way to go,

resistor divider, one of the  resistors to the ground lifts, goes open circuit, , and you put 24 volts on to the arduino,

pop.

optos' the 24 volts is separated always from the arduino,


20  Using Arduino / Motors, Mechanics, and Power / Re: Getting information from power supply on: October 22, 2013, 01:57:34 am
how complicated do you want to go ?

are the leds in a string, wired in series ?

In a string of leds, if one led is off the complete string is off.

if the leds are powered individually , in paralel, then one led can go off , the other will stay on,

or the leds caan be wired as a set of parallel strings,


21  Development / Other Software Development / Re: Performance issues With the W5100 Ethernet Shield on: October 21, 2013, 03:14:18 pm
very impressive,

dont know what can be done,
   the arduino guys are very slow at changing the system,
          look a the list of bugs / features / improvements that have been worked out and are still not used.

I guess , this works, so its used.
   
You would have to account  for when a single byte is written,
   do you wait a certain time before putting that into TCP/IP the packet,  how long ?

22  Development / Suggestions for the Arduino Project / Re: Updates/Comments on Long Term DUE support on: October 21, 2013, 03:01:38 pm
and now the new board as well,
   another arm !

all very confusing,,,,
23  Using Arduino / Motors, Mechanics, and Power / Re: ordinary light switches and arduino, can the coexist? on: October 21, 2013, 12:08:04 pm
if you want the house to be 'standard'

X10 is your friend

these guys amongst MANY sell such things,
   a complete eco system out there,

http://www.uk-automation.co.uk/categories/X10-Home-Automation/X10-Wall-Switches/
24  Using Arduino / Motors, Mechanics, and Power / Re: Autonomous Line Following Hovercraft on: October 21, 2013, 12:04:43 pm
well, very impressed,
   hovercraft dont have breaks, so are VERY difficult to control,
         you must be doing some impressive Kalman  filtering ..

so, blown uno, not to surprised,
   try these guys,

http://ruggedcircuits.com/

a bit more what you want.

probable reason the esc is driving the arduino is the esc  has a pull up on its input to the vsupply.
     so your driving volts to the arduino, the CPU on the arduino has built in diodes to its power and ground, from the io pins. so your volts get put to the arduino, but as its 8v, its goign to blow the arduino,

have a look here, method 3...

http://ruggedcircuits.com/html/ancp01.html

and no I'm not connected to these guys, we just use their boards, and despite my students best attempts, they all still work.




25  Using Arduino / Motors, Mechanics, and Power / Re: Getting information from power supply on: October 21, 2013, 11:55:34 am
will this help

http://ruggedcircuits.com/html/circuit_-28.html

26  Using Arduino / Motors, Mechanics, and Power / Re: Need Help With Scoping Potential Arduino Project on: October 20, 2013, 12:57:59 pm
wifi shield

http://arduino.cc/en/Main/ArduinoWiFiShield

can give you access to the arduino
   but you cant reprogram remotely,

there are others. 

I'd suggest the arduino up by the 'relays' and what ever you control
     I;d also strongly suggest the rugged arduino

  http://ruggedcircuits.com/html/ruggeduino.html

USD 10 more, but much more rugged than the original, especially  in the power in / out portion.

    ,
27  Using Arduino / Motors, Mechanics, and Power / Re: Need Help With Scoping Potential Arduino Project on: October 20, 2013, 07:33:37 am
As well as the switching,
   you also mention time, time of day and week / month.

for this you will probably need  a real time clock chip. the arduino has no knowledge of time when it starts up,

You might also want to think about monitoring / control .
   do you want to go up there to see what the unit is doing, or is a remote monitor the way forward ?

there are answers to this if you want, its complexity compromise.
   you could monitor with a long wire, driving LEDs down stairs,  or you could use an rs232 link to a down stairs computer, or how about Ethernet or wifi,

Some of the wifi and Ethernet shields also have real time clocks on them,  which you could use, else you will have a software timer that needs setting each time the arduino starts, depending how reliable the mains is there.



28  Using Arduino / Motors, Mechanics, and Power / Re: How can I slow down the current draw from a battery? on: October 20, 2013, 06:55:04 am
So current drawn by an object is dependunt upon the voltage applied and the 'resistance' of the object.

Generaly, the lower the voltage the lower the current drawn.  ( Ohms Law )

So if a sencor is drawing too much current you only have three options.
   a) use a different sencor,
   b) run the sencor at the lowest voltage possible
   c) turn the sencor off / on

As for C. If the sencor is a motion sencor, and it can take a reading in say 1 ms, and you can cope with not knowing the motion for 100 milli seconds, ( 10 times per second ) then you could save power by turning the sencor off for 99 ms, and on for 1 ms.

You might not says 99 % of the power due to start up current of the sencor, but you will save quite a bit. And 99ms is not long to wait for a reading. If you only need to know motion every 1/2 second, then yo can save even more.

29  Development / Other Hardware Development / Arm A8 Arduino TRE on: October 20, 2013, 06:38:00 am
http://e2e.ti.com/blogs_/b/toolsinsider/archive/2013/10/03/introducing-arduino-tre.aspx
30  Using Arduino / Motors, Mechanics, and Power / Re: Auto Pilot for Tiny Yacht on: October 19, 2013, 12:10:16 pm
you ight want to have a look at my god daughters web page

http://missisle.com/

she has a rather complex but working auto system,

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