gyro chips

[beer-man]

Since I've taken out two of my gyros in the last three weeks, (pg-03 & teedee hh) I'm looking for some place that sales gyrostar chips by Murata

I think the part number is enc-03ja

It would be great to get some samples from them. :D

[Comatose]

They're really expensive and hard to come by in small quantity. I was quoted about $25 each for 100.

[beer-man]

Well that sucks, I'm willing to pay $10 to $15 for a couple. I did find a place selling them for $75 ( some gyro toy shop) I guess I'll watch ebay and try to get something for my teedee or try to get some samples.

[Eric_N57105]

Well that sucks, I'm willing to pay $10 to $15 for a couple. I did find a place selling them for $75 ( some gyro toy shop) I guess I'll watch ebay and try to get something for my teedee or try to get some samples.

A lot of the 3n1 and 4n1 (rx, esc, bec, gyro) units in microhelicopters (Honey Bee, Blade CP, Walkera, etc) use that part. You can buy a new E-Sky 3n1 (esc,bec,gyro) from heli-direct for $36.

You would have to remove the part, of course. It's surface mount which can be a bitch to replace, but since you are only going to cannibalize it, use a heat gun to melt the solder and slide the gyro off. I sometimes salvage all the parts from old cordless phones, etc this way (good source of 31136 FM IF detectors for RC RXs). I heat them with the heat gun, rap the board on a cookie sheet and all the parts jump off!

You're on your own soldering it onto another board. It's lots of fun.

Anyway, look around and you might find a fried 3n1 or 4n1 (usually they fry the MOSFETS...I've never seen a gyro failure) you can salvage the gyro from. If you know someone with a microheli, chances are 50/50 they have a fried unit in a drawer somewhere. The gyro will likely be fine even if the rest of the board is a crispy critter.

Eric
www.ke6us.com

[Surfs]

Try this : http://sg.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=3349317
They are selling are SGD 102.91, almost USD$60.

BTW how are u gg to make it into a functional circuit that controls the servos? Do you have any resources that i can read up?

[sajeev]

i just came to the DIY forum to ask if there is a circuit around to make my own gyro - and viola ! comeone just asked it :)

well ? is there a circuit ? is it cheaper to make one or to buy one ?

thanks,

sajeev

[Eric_N57105]

i just came to the DIY forum to ask if there is a circuit around to make my own gyro - and viola ! comeone just asked it :)

well ? is there a circuit ? is it cheaper to make one or to buy one ?

thanks,

sajeev

It's ALWAYS cheaper to buy one than to build one. Nobody in his right mind builds electronic stuff to save money. The only reasons to build are, it's:

* interesting
* fun
* possible to get special features not otherwise available.

Eric
www.ke6us.com

[sajeev]

hi Eric :)
beg to differ on that :

its cheaper for me to build -

4 S lipo charger :- commercially available - ~ $45 to $50
home made - $ 5 to $10

Variable Current VOltage 0 -30 volts, 100ma to 5 amps power supply with display for both

commercial - $ 150 to 400
home made $ 35 to $80

PIC Programmer paralle port:

commercial - $ 30 to $245
home made - $10 to 15

Yup. its fun to build and interesting so i have not added cost for time used to build the project :)

but then . Yes its cheaper to buy some stuff like BL controllers and gyroscopes cos the components are sold in bulk and are more expensive than the finished commercial product. :)

[jeffs555]

Eric's only mistake was saying ALWAYS as there is an exception to every rule. In the overwhelming majority of cases, if you count your labor, it would cost more to build than to buy. DIY for the enjoyment, DIY to learn something, DIY to get features not available commercially, but if you DIY only to save money you will be disappointed.

PS Add in time for scrounging parts, as you must have done. You sure didn't build a 5A regulated voltage and current supply with dual meters for $35 to $80 by ordering parts from Digikey. Just a transformer and case alone would be nearly $80.

[beer-man]

I'm looking to repair these gyros, but you could take the output of one of these chips and feed it in to a pic processor. I was hoping to locate some chips for a reasonable price. I've gotten some off ebay for $20 to $30 bucks. also (Eric) I would beleave most bad ones would have a dead gyro chip as mine do.

[chinlin0924]

I am interesting to build my own gyro too.
but the first step is to understand how the main component of gyro works in electrics, and its attributes.

any circuits or code samples would be welcome!

thank you

[JMP_blackfoot]

http://www.platan.ru/cgi-bin/qwery_isea.pl/ENC-03J.html
These guys sell them for 688 ruble (ENC-03JA) or 519 ruble (ENC-03JB) a piece
1 dollar US = 27 ruble
688 ruble = 25.4 USD
519 ruble = 19.2 USD

[Eric_N57105]

I'm looking to repair these gyros, but you could take the output of one of these chips and feed it in to a pic processor. I was hoping to locate some chips for a reasonable price. I've gotten some off ebay for $20 to $30 bucks. also (Eric) I would beleave most bad ones would have a dead gyro chip as mine do.

Beer-man

Yeah, that's exactly what they do in the 4n1s. The gyro signal feeds the uC directly and everything is done in software. But they are simple routines doing nothing but dampening the tail using the yaw rate info. Of course, I have no idea what the software looks like since it is a proprietary chip, but it shouldn't be very tough to do it with a PIC.

I've repaired over 60 of the 4n1s for the Honeybee and Blade CP from all over the world. I've only seen one gyro failure. That was a very hard impact on the corner of the ESC/gyro board that popped off the metal cases for the gyro and the uC resonator.

Most of the problems with those boards are not directly from impact. In most cases the MOSFETs (Fire Emitting Transistors) explode or catch fire when the tail or main motor stalls in a crash. That usually fries the board deep into the fiberglass, but the gyro is fine. I sometimes restore the MOSFET circuitry by mounting the new ones dead bug style and have no problems from the gyro.

So that's why I'm pretty sure you could recycle gyros from fried 4n1s, assuming you could find the guys that have them.

Eric
www.ke6us.com

[beer-man]

Eric,
Yes your right about 4n1's frying, I wasn't thinking about that. It did make me think about the flaky walkera 4n1 I have. looked at it last night and it has a diferent gyro,surface mount,but I did find pin outs for both. hope to play around tonight.

JMP_blackfoot
thanks for the link $25 bucks might be do-able, if I can just get one or two.

[beer-man]

Ok I've successfully transferred a surface mount one to my pg-03 for testing. Now since it works I'm going to try to get it in my teedee hh. Also I opened one of the dead enc-03ja's theres a processor chip on the bottom and a crystal suspended by z shaped wires, and there was a chunk broken off the end.

[Hell-e-Guy]

Fire Emitting Transistors....Eric.... Never heard a more accurate explanation.

[mattijs321]

Beer-man

Yeah, that's exactly what they do in the 4n1s. The gyro signal feeds the uC directly and everything is done in software. But they are simple routines doing nothing but dampening the tail using the yaw rate info. Of course, I have no idea what the software looks like since it is a proprietary chip, but it shouldn't be very tough to do it with a PIC.

I've repaired over 60 of the 4n1s for the Honeybee and Blade CP from all over the world. I've only seen one gyro failure. That was a very hard impact on the corner of the ESC/gyro board that popped off the metal cases for the gyro and the uC resonator.

Most of the problems with those boards are not directly from impact. In most cases the MOSFETs (Fire Emitting Transistors) explode or catch fire when the tail or main motor stalls in a crash. That usually fries the board deep into the fiberglass, but the gyro is fine. I sometimes restore the MOSFET circuitry by mounting the new ones dead bug style and have no problems from the gyro.

So that's why I'm pretty sure you could recycle gyros from fried 4n1s, assuming you could find the guys that have them.

Eric
www.ke6us.com

Its probably not that hard building a gyro that works to some extent...biulding a good one is very tricky because you have the have the coefficients of the PID good. Be it in software OR hard...
That is if you want a heading hold gyro....a rate one will be easier.

If you have the eauipement i think you can do the bodeplot of a known gyro....but im not sure that can be done accurate