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Messages - Lotuswins

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Open Panzer Help / Re: Recoil wiring
« on: October 26, 2020, 05:18:18 PM »
Isn't that an old Taigen/HL recoil unit, not an airsoft?  Are you saying they are wired the same? Makes sense though, just a motor moving until switch opens/closes....


Show and Tell / Re: FatFingers Cradle
« on: August 05, 2020, 05:34:07 PM »
Before you ask, here is one for the OPTCB.....

Show and Tell / FatFingers Cradle
« on: August 05, 2020, 01:31:30 PM »
Hi all,

Thought I'd share the cradle for the FatFingers DIY board. 


TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: July 31, 2020, 01:09:05 PM »
Hi Luke,

2.1 amps....back in 18......must have been an abused smoker  8)

I seem to have melted a few down too..... :-\

So I pulled out two new, one used Taigen V2 smokers out of the spares bin and messed around for a little while. 

I hooked up my FatFingersV2 board, and put the Fluke in series measuring amps in the AVG (average) mode.  At 80 percent setting at idle, I got 0.56 to 0.60 amps on all three smokers.  It goes up a bit when increasing the throttle to 100% as set up on the board, but not much.

So I then plugged the smokers directly into the battery at 7.89volts unloaded 6 cell NiMh.  This yielded 0.73 to 0.80 amps.   

A curious thing is happening though when you let the smoker run for a while.... The current reading, starting at 0.6 amps, would slowly rise.   At roughly the 2 minute mark, the amps had increased a little over 10%.  The front of the smoker got hot, could hardly touch it....I wonder if my previous readings were maximums with a very warm smoker?  Perhaps.....

So the resistor in the stock Taigen V2 units is a NiCr wire, wrapped around a fiberglass or silicone fabric cylinder, right?  Small, but effective..  I've seen them, after much use, turn all black, burnt to a crisp.  I wonder if the heating action eventually turns the insulator to carbon, reducing the resistance causing even more current to flow?  Right now, I've given up on the smokers, just replace them as they fail since they are cheap.   HL now has a newer version though, that has an improved resistor configuration (V6.0 I think) which has the wire wrapped piece inside an insulating tube, which wicks up the fluid.  The resistor is smaller than the Taigen version, and instead of a wad of cotton to wick the fluid up, they use a little sponge.  I have one in my JS2, and so far it hasn't failed me.  I haven't done a current read on it yet, but the resistance is in the same ballpark as the Taigen IIRC.

Thanks for doing the current calcs, at least it looks like the board will survive a stock smoker.  No temperature rise on the traces was detectable after the 2 minute run above.

TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: July 27, 2020, 11:29:42 AM »
Hi Luke,

Thank you so much for the kind words, especially since mine is obviously an amateur effort.  One doesn't appreciate what effort goes into a boards design until one attempts his own!!  Your layout is really a piece of art!!  I can't imagine how long it must have taken to get all those bits and pieces to align and fit on a 2 layer board, it boggles the mind.

The Arduino I've located to replace the Robotdyn that works is from ebay:  I have two operating, so far so good.  I hope Robotdyn has fixed the 5v regulator issue, as I fear the ebay source will eventually dry up/change.... I will try again at Robotdyn, in the near future.  I could not find another 'commercial' outlet for the board, that would be a better source?

I think the OSH boards are better quality than the Seed version.  I was replacing that pesky transistor Q7, and the pads wanted to distort/lift on me with the Seed PCB.  The OSH pads seem to be better anchored to the substrate.  The reason I got the thinner board from OSH is that they don't offer the 1.6mm board and 2 oz. copper.  I have a good friend who I went to school with that went into the electronics field, and he recommended I use 2oz copper.  I'm not sure how 1 oz would work?  I really didn't do any current calcs on the board, simply went with as large a trace that would fit in the confines for other than signals (smoker, airsoft, etc.).   Also, the purple is a nice relief from the standard green color  8)

I feel honored that I'm the first on the Members Design!!! thank you.....Jerry

TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: July 25, 2020, 03:10:18 PM »
Hi Luke,

Well I think I'm done with my shield.  I called it 'FatFingers' since us old folks can't seem to manipulate the SMD components too easily. 

I've included the Gerber zip file, and in the Here is the FatFingers V2 boards zip is the PDF of the schematic, the BOM in excel, an assembly writeup in Word, and the Eagle files.

I hope this helps someone who wants a TCB but can't manage the SMD and flow soldering.  Let me know if you have any comments?  I've assembled 4 of these so far, with 6 more to go.  Takes me about 3-4 hours for one, but doing multiple takes less time per board.


TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: July 13, 2020, 09:22:47 PM »
Thank you Luke, especially for the advice on the bias resistor. 

I hope to finalize everything soon if this works, all else seems okay.   I plan to share the eagle/gerber files along with BOM and details on assembly.  It should be a much easier build than the original, but same footprint and connectors though without some of the frills which I have never used in any of my 12 tanks that have OPTCBs.....

Anyway, hopefully it will help your awesome design continue on.  I cannot thank you enough.   :)


TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: July 13, 2020, 01:48:38 PM »
Hi Luke,

I just ordered these up to test...should work?  I hope not to have to modify the boards/submit a new board request since it took 3 months last time from Seed  :'(


TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: July 12, 2020, 02:41:46 PM »
Hi Luke,

I'm just about finished with my shield, but am having difficulty with the airsoft.  I measured 1.7 amp max on my DVM for the airsoft unit, and I don't think the BC337 is up to the task since it won't even start the motor running.  BC337 is rated at only 0.8 amps, and the surge must be too much on motor start.

Would you have a recommended TO92 replacement in mind?

Open Source Sound Dev / Re: SD socket hand solder?
« on: May 20, 2020, 04:04:30 PM »
Thanks Rich,

I'd not heard of conductive adhesive.....sounds long as its long lived? 

I finally found a socket that had pins accessible by a soldering iron....tiny indeed!! 

Now if Seed would finally get my first run PCB's to me....the Corona seems to have way laid them ;)  and OSH seems to have raised their prices by 1/3....sheese.


Show and Tell / Re: Cheap Remote Volume Control
« on: May 11, 2020, 05:12:04 PM »
.stl files for those who might be interested....



Cost is $3 for servo from HK, and $6 for the pot from IMEX/Taigen, other than the hardware and new 3D printer....;)


Show and Tell / Cheap Remote Volume Control
« on: May 11, 2020, 04:48:59 PM »
So I've been making remote volume control for some time, using a cheap servo and the stock potentiometer for HL or Taigen.  Unfortunately this in line configuration doesn't give full rotation, the pot having a 270 degree sweep, and the servo only giving 120 degrees.  Enter a newly given 3D printer for my birthday, and having learned a little CAD on Fusion360, and finding an insert into the program to do spur gears, I've assembled this configuration which gives full travel:

The long M3 screws are 25mm long, you have to drill the gears to fit the pot and servo splined shafts, but be careful as you don't want to drill all the way through.  When assembling, plug both the servo and the pot into the tank, and turn the pot clockwise until the volume just goes to zero, and using the transmitter turn the servo counter clockwise all the way and then pop the large gear onto the servo.  Test to ensure it travels smoothly all the way to both stops.  The cover keeps you from jamming any wires into the gears. 

It fits rather well into a crook or cranny in the tank pretty easily. 

I'll load the .stl files next post.


TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: April 29, 2020, 12:40:28 PM »
Hi Luke,

Thanks for answering.  My shield does not use the 5v output from the Arduino reg, but the digital pins do output a 5v signal, so too many outputs for the little reg they installed?  However unlikely that is, I did rob an old reg chip off a parts arduino and both new ones are now working fine (it is an 800ma output also), so as you surmised, it is probably the chinese made issue.

Oh well, I've ordered from another source so we will see if they will be more reliable.  I have two Robotdyn ones functioning okay, from older manufacture, and these two new ones failed in one week.....only discernible difference (to my humble observation skills) are the 5v reg stampings.


Open Panzer Help / Re: tamiya mech recoil
« on: April 29, 2020, 12:19:22 PM »

I assume your answer is that you did a continuity check and it was okay?

Okay, looking at your radio details, aux 4 has a low of 1500 and high of 2011.  That seems odd.  Try resetting all your radio inputs so that you get 988 to 2011 for their range.  It could be the radio input is telling the TCB to fire continually.

Another thought is to raise your deadband on channel 4, it may be just on the edge. I've had that happen on my turret settings, kept getting the sound continually or intermittently.

FWIW, Jerry

TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« on: April 24, 2020, 01:35:01 PM »
Hi Luke,

I hope COVID19 isn't impacting your life too much.  Being retired, it is only the stay at home that is tiresome, but then I do modeling a lot and I just got a Prusa Mini in the mail which is keeping me occupied  ;D

So I am still chipping away at the Arduino shield, and got my first set back from OSH.  I had worked a few more days on the board layout and finally rearranged it down enough to get it onto a two layer board.  That was a chore!!  I found four errors on the OSH boards after initial testing, and have those corrected so I sent version 2 off to Seed since they have thicker boards (the 30 mill OSH ones are nice, but prying off the arduino really stresses them) and I can get 10 boards for almost the same price ($49).   Once I have those tested I can share it all. 

So the reason for my post is the Robotdyn Mega2560Pro auduino boards I have been using seem to now have a defect.  The ones prior have all worked, as long as you get the right one as was brought up earlier, but now apparently they have changed the 5v on board regulator to a more recent version and on both boards I just received, the regulator has failed.  One on initial power up, and the 2nd after a few days of testing. 

Details on the 5v regulator:

Earlier boards that work fine:  AMS1117 5.0 H904LP

These, faulty boards: AMS1117 5.0 GMIC 1938

I don't know if these are clone chips or not.  Anyways, I replaced the regs on both and they are now working.

So my question is: Does anyone know of another source of the Arduino Mega2560Pro other than Robotdyn that can be flashed okay by OPConfig??

thanks, Jerry

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