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leo1954au	#1 01/03/2014 - 23h50 Top
Class : Apprenti Posts : 7 Registered on : 27/02/2014 Off line	I'm using the battery powered setup by benmeijer and wanted to know would 27 Ohm 1/4w resistors do instead of 30 Ohm ones because I cannot find a place that sells that type Thanks EDIT: Just noticed in his instruction saying { Feel free to use resistors (metal film or carbon film) between 20-40 Ohm. 1/4 watt E24 } So I guess that answers my question Edited by leo1954au on 02/03/2014 at 00h01.
Stormrider	#2 02/03/2014 - 12h05 Top
Class : Légende du Forum Posts : 466 Registered on : 02/01/2013 Off line	EDIT: Just noticed in his instruction saying { Feel free to use resistors (metal film or carbon film) between 20-40 Ohm. 1/4 watt E24 } So I guess that answers my question it also depends on what kind of battery you use.Regular are 1,5V and rechargeable 1,2V. Keep in mind, batteries run empty.You have a slow(hopefully not fast) voltage drop.You leds brightnesss also changes. If you want it to be wireless think about something like a usb-backup battery.You have a steady 5V output and you can play for hours with it without a problem.
leo1954au	#3 02/03/2014 - 18h04 Top
Class : Apprenti Posts : 7 Registered on : 27/02/2014 Off line	I was thinking of AA battery enclosure purely for convenience at not having leads everywhere but after connecting up a SFH845p Led with a 33 Ohm resistor to the battery enclosure to test it I'm not getting any light from the led what so ever so I tried a 22 Ohm with the same result so don't know what the problem is the two 1.5V batteries are new and so are the leds resistors. I'm going to try the USB connection and see if the leds light up, Hope so I had to order the leds online and the thieves charged me $11 postage
Stormrider	#4 02/03/2014 - 18h25 Top
Class : Légende du Forum Posts : 466 Registered on : 02/01/2013 Off line	I was thinking of AA battery enclosure purely for convenience at not having leads everywhere but after connecting up a SFH845p Led with a 33 Ohm resistor to the battery enclosure to test it I'm not getting any light from the led Ir-light of those leds is not visible for the human eye.You can only check it with a digital camera or webcam.Maybe you connect it wrong.I also had a few times that it didn't light-up.I made a mistake with the positive an negative side of the led.They only work one way.
leo1954au	#5 02/03/2014 - 18h56 Top
Class : Apprenti Posts : 7 Registered on : 27/02/2014 Off line	Ok thanks I didn't know their light was not visible to the human eye I just followed the instruction from the Easy build setup with SFH485P on the forum that are pretty easy to undersand and I'm sure I had it setup right.
leo1954au	#6 02/03/2014 - 19h41 Top
Class : Apprenti Posts : 7 Registered on : 27/02/2014 Off line	Just checked the led using a PS3 eye webcam and it's working good thanks for the info about the leds not being seen by the naked eye
benmeijer	#7 05/03/2014 - 14h02 Top
Class : Habitué Posts : 208 Registered on : 19/07/2008 Off line	Updated my "Easy Build Topic" with more info how to check your build!

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