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« Reply #75 on: December 10, 2010, 06:29:36 PM »
Ashta
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Dear kaushik,
good evening... did not do any other scratch builds other than this copter which took lot of my time, mainly reading and getting a hang of this.. still far away from learning to fly... Old is not gold for learning.....
see u this sunday
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« Reply #76 on: December 11, 2010, 02:52:43 PM »
Ashta
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1. A low voltage alarm is a must for Tri/Multi copters since there is no wing and there for lift. Hence, once the battery is empty the Tri can come down and crash like a stone.
2. It is always better to Power on the recievers and the Gyro first and stabilise them before giving Power to the EScs. This is because some of the ESCs need to see a valid PPM signal for a good healthy Power on. Hence BEC is a good idea.
3. In a SIGNGUY TRICOPTER, the gain of three motor gyros are combined and given to throttle channel. It is a good idea to have aconnector to do it on board.

all the above requirements are obtained in the given cct attached. This whole cct costs lesss than rs40.00
This is not my cct. i have gathered it from several places.
I have wired this on a proto board on my TRICOPTER and it works very well.
Sharing the Photo and the cct.
thanks
ashta

* BEC-LOW VOL ALRM-GAIN GYRO CCT.pdf (78.2 KB - downloaded 1222 times.)
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« Last Edit: December 11, 2010, 04:13:55 PM by Ashta » Logged

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« Reply #77 on: December 11, 2010, 03:51:02 PM »
anwar
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Nice !

So a single battery is used, for the BEC also ?

When I was messing with the quad, I also realized that powering up the gyros first is important, but I did it with an external BEC and a separate 2s receiver lipo.
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« Reply #78 on: December 11, 2010, 04:12:49 PM »
Ashta
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So a single battery is used, for the BEC also ?
yes Anwar. The same 3 cell Battery's balancing plug is used to power on the RCVR and the Gyros. Once the Light on the Gyros is stable ( indicating that they are initialised and armed), then u connect the main Connector of the battery to the Escs. Each power on requires throttle calibration.. so keet the throttle channel full before power on.




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« Reply #79 on: December 11, 2010, 07:03:48 PM »
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all the above requirements are obtained in the given cct attached.

The Circuit diagram for the voltage alarm would be fantastic.
I see you are using the servo connector to connect the Lipo balance lines to the board. JST-XH male/Female (including 90 degree connectors) are available in SP Road by the name of 'RMC' connector. Arihant Electronics on the main road (near the temples) have good quality ones.
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« Reply #80 on: December 12, 2010, 12:21:27 AM »
anwar
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The Circuit diagram for the voltage alarm would be fantastic.

Already posted above...

http://www.rcindia.org/self-designed-diy-and-college-projects/new-tricopter-build/?action=dlattach;attach=628384

PS: That reminds me... I have to put a bigger icon for PDF attachments.
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« Reply #81 on: December 13, 2010, 11:02:18 AM »
Ashta
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probabaly u missed the cct diagram i had attached as a PDF file in my post. The very idea of my post was to share this.
I am using the same Balance connector matching male connector (available form SP road) to Tap the 12V from the balance connector of the Lipo. This is fed to the "Low volatage alarm" and BEC circuits.
hope this is clear.
ashta
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« Reply #82 on: January 20, 2011, 03:04:46 PM »
Ashta
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Not able to fly for many weekends.

Just could try my TRI, two days back. Progressing inch by inch.. but very stable platform..

here is a short video.


thanks.
ashta
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« Reply #83 on: January 20, 2011, 03:15:41 PM »
rohitgupta322
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Wow rock stable ashta sir  Salute Salute. BTW how susceptible is it to winds.
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« Reply #84 on: January 20, 2011, 04:48:44 PM »
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Man.. That thing is stable! Ashta sir, how much flight time does it give? ( Damn.. I sound like a Maruti Suziki ad don't I...  Kitna deti hai? Giggle )
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« Reply #85 on: January 20, 2011, 04:50:13 PM »
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LOL! I just remembered the Maruti Add before I could read your complete quote!!
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« Reply #86 on: January 22, 2011, 09:41:31 AM »
Ashta
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Thanks rohit. sorry for the late reply.
I have tried this in moderate winds w/o problems. 10 -15 KM/hour i suppose.




Wow rock stable ashta sir  Salute Salute. BTW how susceptible is it to winds.
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« Reply #87 on: January 22, 2011, 09:45:04 AM »
Ashta
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i use two type of batteries.
1. 2200mah,3cell= gives me 10-12 mins
2. 4400mah,3cell= gives me 20 mins
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« Reply #88 on: January 22, 2011, 10:34:51 AM »
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Ashta Sir's creations, as far as I am concerned, serve one major purpose. They make me feel so mediocre and my efforts seems so inadequate. Seriously.

Maestro! Bow Bow Bow
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« Reply #89 on: January 24, 2011, 12:16:45 PM »
Ashta
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dear vc,
not at all.... The efforts that you are doing and the services that u provide (coaching IIT students..) are remarkable. Waiiting to see your hovercraft in full swing..
best regards
ashta

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« Reply #90 on: January 31, 2011, 08:30:22 AM »
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Hello Ashta sir; i want to build a tricopter as a final year project what home work did u do before the actual build. any suggestions on what books to read?
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« Reply #91 on: February 01, 2011, 02:38:23 PM »
Ashta
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Hello Ashta sir; i want to build a tricopter as a final year project what home work did u do before the actual build. any suggestions on what books to read?
hi arhun,
sorry for the late reply. I was out of station.
u can see all the posts here. it is a long read...
http://www.rcgroups.com/forums/showthread.php?t=1142429

i got all the information from the above posts


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« Reply #92 on: February 01, 2011, 03:39:26 PM »
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Thanks a lot  Bow
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« Reply #93 on: March 05, 2012, 04:27:33 PM »
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Then got 1.5 mm FRC sheet for the frame.
Where did you source these sheets from?
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« Reply #94 on: March 05, 2012, 05:51:13 PM »
Ashta
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conatct pcb vendors in pune
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« Reply #95 on: March 05, 2012, 05:55:54 PM »
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will try that, thanks.
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« Reply #96 on: March 05, 2012, 06:03:09 PM »
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Hello Ashta sir.
I am currently building a quad with a MultiWii CRIUS board. I am using aluminium square pipes. Did you come across any FRC sheet sellers ONLINE? Thanks.

Vineet
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« Reply #97 on: March 06, 2012, 11:19:05 AM »
Ashta
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no vineet, i got it from a local PCB vendor
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« Reply #98 on: January 10, 2014, 08:12:27 PM »
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where did you order all the parts from , ashta ji ?
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