My crazy Micro Heli FPV idea. I need some advice!

caall99 · 05:47 PM

I am using the FPVhobby.com 200mW 5.8GHz transmitter that draws 330mA @ 3.3V...

and a MC-495A camera that draws 75mA @ 3.3V to 6.0V.

Total theoretical draw is 405mA. This is a micro heli FPV setup (which may never fly from the added weight). Every gram counts here and i predict a 10 minute (at the very very most) flight time off the 180mAH main battery. I would like to match my video setup to the main battery's limited flight time, in order to keep the weight as low as possible.

1. Any recommendations on camera and Tx batteries and where to get them at the lowest price? Since I assume these batteries will be sub 100mAH, what sort of charger should I be using?

2. How can I effectively drop the 4.2V from a fully charged 1S battery to 3.3V to power the Tx and camera? Will LD1117 LDO do the trick? Or should i be using a diode?

Thanks for the help guys! Ordering everything right now!

caall99 · Oct 03, 2011, 09:39 PM

Any tips while i am buying stuff?

caall99 · Oct 04, 2011, 04:49 PM

bump? lol

It appears that the LD1117 requires an input voltage of at least 4.75v to output a regulated 3.3v. We all know a 1S battery won't achieve 4.75 volts, so it looks like i cannot use this chip. Are there other voltage regulators that can regulate to a 3.3v output and accept a 2.7v to 4.2v input?

Thanks.

caall99 · Oct 05, 2011, 04:51 PM

Yipee! Talking to myself. Perhaps this LDO meets my requirements?
http://search.digikey.com/scripts/Dk...0-33WLDIDKR-ND

Can someone confirm?

Also, i still need to find myself a battery for the VTx.

caall99 · Oct 06, 2011, 03:28 PM

What do you do if no one responds to your thread?? Just sit there? lol...

Mark Wood · Oct 07, 2011, 11:40 AM

This should be asked in the FPV forum where the experts reside. You'll likely get the info there that you are looking for.

mw

caall99 · Oct 07, 2011, 12:00 PM

Is there anyway this topic can be moved please?

everydayflyer · Oct 07, 2011, 12:28 PM

Click on the Report This Post to a Moderator
and then request it be moved to..................

caall99 · Oct 08, 2011, 02:32 AM

Thanks for moving this... Maybe i will have more luck here!

marco899 · Oct 08, 2011, 02:51 AM

I have done it with a micro heli, but your transmitter is to heavy and has to much output power. You better grab a set of these http://www.fpvhobby.com/143-sub-nano-combo-set.html and use a seperate lipo for it.

FPVistanbul · Oct 08, 2011, 09:14 AM

Hi caall99.

Why do you want a regulator device from 4.2V to 3.3V? Our 5.8gHz 200mw Tx module works with 3.3V - 4.2V directly. No need a step-down regulator for it.

Best regards.
Adnan.

CrashMeUp · Oct 08, 2011, 10:36 AM

https://www.insecure.ws/2010/02/25/u...heli-blade-msr

caall99 · Oct 08, 2011, 11:28 AM

Quote:

Originally Posted by FPVistanbul

Hi caall99.

Why do you want a regulator device from 4.2V to 3.3V? Our 5.8gHz 200mw Tx module works with 3.3V - 4.2V directly. No need a step-down regulator for it.

Best regards.
Adnan.

Because I found the unit for 15 dollars new (shipped), vs. your cost of $39. So i am looking to make the modification myself.

CrashMeUp · Oct 08, 2011, 11:41 AM

also 1s 50mah zippy at hk for flights shorter than 5 min are fine. else 160mah hk nanos

the 5.8ghz rx is 2x cheaper at hk too.
the camera has a decent price at fpvhobby but it probably is much cheaper if you find a larger supplier.
i usually get all from fpvhobby cause its convenient execpt the rx, at hk

Oct 03, 2011, 08:08 PM	#1
caall99 Power-line attraction pilot United States, MA, Natick Joined Jun 2011 471 Posts	My crazy Micro Heli FPV idea. I need some advice! I am using the FPVhobby.com 200mW 5.8GHz transmitter that draws 330mA @ 3.3V... and a MC-495A camera that draws 75mA @ 3.3V to 6.0V. Total theoretical draw is 405mA. This is a micro heli FPV setup (which may never fly from the added weight). Every gram counts here and i predict a 10 minute (at the very very most) flight time off the 180mAH main battery. I would like to match my video setup to the main battery's limited flight time, in order to keep the weight as low as possible. 1. Any recommendations on camera and Tx batteries and where to get them at the lowest price? Since I assume these batteries will be sub 100mAH, what sort of charger should I be using? 2. How can I effectively drop the 4.2V from a fully charged 1S battery to 3.3V to power the Tx and camera? Will LD1117 LDO do the trick? Or should i be using a diode? Thanks for the help guys! Ordering everything right now!
	Last edited by caall99; Oct 05, 2011 at 05:47 PM.

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Oct 03, 2011, 09:39 PM	#2
caall99 Power-line attraction pilot United States, MA, Natick Joined Jun 2011 471 Posts	Any tips while i am buying stuff?

Oct 04, 2011, 04:49 PM	#3
caall99 Power-line attraction pilot United States, MA, Natick Joined Jun 2011 471 Posts	bump? lol It appears that the LD1117 requires an input voltage of at least 4.75v to output a regulated 3.3v. We all know a 1S battery won't achieve 4.75 volts, so it looks like i cannot use this chip. Are there other voltage regulators that can regulate to a 3.3v output and accept a 2.7v to 4.2v input? Thanks.

Oct 05, 2011, 04:51 PM	#4
caall99 Power-line attraction pilot United States, MA, Natick Joined Jun 2011 471 Posts	Yipee! Talking to myself. Perhaps this LDO meets my requirements? http://search.digikey.com/scripts/Dk...0-33WLDIDKR-ND Can someone confirm? Also, i still need to find myself a battery for the VTx.

Oct 06, 2011, 03:28 PM	#5
caall99 Power-line attraction pilot United States, MA, Natick Joined Jun 2011 471 Posts	What do you do if no one responds to your thread?? Just sit there? lol...

Oct 07, 2011, 11:40 AM	#6
Mark Wood characters welcome! United States, CA, Bear Valley Springs Joined Feb 2000 24,575 Posts	This should be asked in the FPV forum where the experts reside. You'll likely get the info there that you are looking for. mw

Oct 07, 2011, 12:00 PM	#7
caall99 Power-line attraction pilot United States, MA, Natick Joined Jun 2011 471 Posts	Is there anyway this topic can be moved please?

Oct 07, 2011, 12:28 PM	#8
everydayflyer Southern Pride Haralson County GA. USA Joined Oct 2004 34,187 Posts	Click on the Report This Post to a Moderator and then request it be moved to..................

Oct 08, 2011, 02:32 AM	#9
caall99 Power-line attraction pilot United States, MA, Natick Joined Jun 2011 471 Posts	Thanks for moving this... Maybe i will have more luck here!

Oct 08, 2011, 02:51 AM	#10
marco899 Registered User Netherlands Joined Sep 2007 401 Posts	I have done it with a micro heli, but your transmitter is to heavy and has to much output power. You better grab a set of these http://www.fpvhobby.com/143-sub-nano-combo-set.html and use a seperate lipo for it.

Oct 08, 2011, 09:14 AM	#11
FPVistanbul Registered User Istanbul / Turkey Joined Oct 2007 174 Posts	Hi caall99. Why do you want a regulator device from 4.2V to 3.3V? Our 5.8gHz 200mw Tx module works with 3.3V - 4.2V directly. No need a step-down regulator for it. Best regards. Adnan.

Oct 08, 2011, 10:36 AM	#12
CrashMeUp Crashomatic United States, CA, SF Joined May 2010 1,825 Posts	https://www.insecure.ws/2010/02/25/u...heli-blade-msr

Oct 08, 2011, 11:41 AM	#14
CrashMeUp Crashomatic United States, CA, SF Joined May 2010 1,825 Posts	also 1s 50mah zippy at hk for flights shorter than 5 min are fine. else 160mah hk nanos the 5.8ghz rx is 2x cheaper at hk too. the camera has a decent price at fpvhobby but it probably is much cheaper if you find a larger supplier. i usually get all from fpvhobby cause its convenient execpt the rx, at hk