Recent Posts

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TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« Last post by Lotuswins 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
« Last post by LukeZ on July 13, 2020, 04:47:48 PM »
Hi Jerry, sorry for the slow reply. The ZTX651 looks like it should work fine, though I note the order of the pins appears to be reversed from the BC337, so you will just want to double check and probably flip it around when you install it.

Also, to get the full 2 amps out of that transistor you will want to reduce the base resistor to around 200 ohms, this is R4 on your schematic.

Let us know how it works!
TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« Last post by Lotuswins 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
« Last post by Lotuswins 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?

TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« Last post by LukeZ on July 12, 2020, 09:08:47 AM »
Hello Kim! Your design is extremely impressive and interesting. Thank you for sharing! It is very educational to see the design choices you have made and the components you have chosen, I think a lot can be learned from this design. I see you have changed some of the pins in order to manage the onboard main motor drivers, it looks like you had to sacrifice PWM on the Hit Notify and Aux outputs? 

I may be willing to make some changes to OP Config on your behalf but it is something I will want to think about and I may not do it right away. Of course it would benefit you and your club but the extra options in the documentation will only confuse all the hundreds of other people who already have a TCB, so I have to weigh these things carefully.

In the meantime it would be great if you could make your project open source, including the firmware for the Arduino Mega, and board files and bill of materials for your shield. This could be hosted on GitHub. If you are able you can make a fork of the TCB firmware with your changes on your own GitHub, or if you prefer you can provide me the source code and I can fork it myself and host it on the Open Panzer GitHub page.

You may be interested to know that in fact all the functions could be simplified onto the Teensy 3.2 alone, eliminating the need for the 2560 altogether. In other words, we can combine both the sound card ability and all the rest of the TCB functions onto just the Teensy, including onboard main motor drivers as you have done, so that in the end we have a complete single board product. The 3.2 has barely just enough pins if we use some shift registers! I have started writing code for this but it is not yet complete and I don't know when I will have the time to finish it. I haven't even started on a board design. I am not spending much time in development this year due to other commitments, but if the project were to be revived someday I think that would be the way to do it. But for now it is just an idea.
TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« Last post by Heclo on July 10, 2020, 02:42:55 AM »
I could however use some help making some additions to the OP config, to implement some of the changes I have made, a little better.
In order to use 2 sets of onboard motor drivers I have had to "hi-jack" the code of one of the selectable ESC's, I chose the Sabertooth, but it would be neat to have an actual parameter that was called "Build-in driver (Motor C)" and "Build-in driver (Motor D)" or something like that.

I have also made some exspansions to the Forces of Valor IR library, defining ammo types with different armor penetration, and on the receiving end definitions of armor thickness (I'm also working on a directional IR receiver, making side and rear shots a possibility, with a higher chance to penetrate as a result). This is also something I wish to have implemented in the menues.

I know I am asking a lot, but I really wish to keep this project alive and we are a 1/16 rc tank club with about 20 members testing my creations out and the enthusiasm is high.

Best regards Kim Olsen Panzer Club Denmark.
TCB Dev / Re: Testing TCB Firmware with Stock Arduino Mega
« Last post by Heclo on July 09, 2020, 07:38:56 AM »
Hello everyone!

I have been following the Open Panzer project for a while and in my education as a electronics technician I made a "shield" that fit on an arduino mega 2560 R3 board, with most of the functions of the Open Panzer TCB and the Open Panzer sound card onboard, plus some extras.

Instead of the L298 motor driver as the onboard drivers I have opted for 2 x VNH5050 chips which are similar to those found on the OP Scout ESC, but in a smaller package. They can draw 30A each and therefore should be adaquete to most aplications. I have also added 2 additional H-bridges to power the turret elevation and traverse motors, they can draw 3A each.

The high-current drivers have current monitoring which I have implemented into the TCB code so that throttle commands corrosponds to engine wattage instead of a PWM setting, this makes simulating a models scale power a lot easier, resulting in realistic slow down when going uphill or through rough terrain.

All in all this makes Open Panzer a stand-alone board with all the necessary components onboard (except for a radio recaiver I suppose).

It has been tested in so far 6 different tanks with great results.
I have attached the schematics and a pinout rendering for those interested.

Open Panzer Help / Re: replacement for CTS - R resistor network series 743
« Last post by bayou on June 25, 2020, 07:11:55 AM »
Hi Luke.

Sorry for delay. Many thanks for your help and support.

best regards
Show and Tell / Re: Cheap Remote Volume Control
« Last post by Snipah on June 25, 2020, 03:34:37 AM »
Hey great idea, thanks for posting
Open Panzer Help / Re: BDESC-S10E-RTR esc
« Last post by LukeZ on June 22, 2020, 01:04:41 PM »
The Quicruns should work well. Let us know if you have any more issues!
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