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Messages - Sub
1
« on: September 04, 2023, 10:15:13 AM »
Hi,
Thx for your quick reply, to answer a few of your questions,
The board is a stock Arduino mega 2560, nothing i have made, it is flashed with Luke's DIY Arduino firmware, 7.2volts power is supplied to the board via the jack plug utilising the on board 5v volt regulator for running the board only and utilises a separate 5v independant board for positive and negative feeds for the ancillary components, servos, leds etc with a common negative.
I have now managed to identify and isolate the issue, i had an incling what it was and further testing has confirmed it, as i mentioned in my earlier post, it works fine on 7.4volts but not on anything more despite being rated from 5 volts to 12v input
I checked the specs and various youtube testing videos of the AMS 1117 5.0 VOLT regulator chip mounted on the board and it appears that they are equipped with a thermal regulator that shuts the chip down if it gets over voltage or over current, then re sets when cooled ( provided you have not blown the chip off the board )
It would appear that for some reason my regulator chip has become defective and its parameters have gone out of whack and it tripping this failsafe too early.
I had another chip on an Arduino Uno i was not using so removed it and soldered it back onto my Mega board and everthing is now working fine
A pic of the offending regulator chip.
Hope this may be of use if someone else has this issue.
Regards.
Sub
2
« on: September 03, 2023, 03:53:13 PM »
Hi,
I have suddenly started having an issue with my Arduino Mega 2560 diy board.
The issue is that if i connect a freshly charged NIMH 7.2v pack or 2cell lipo via the jack plug the board throws a fit by flashing all the lights on in quick time, All the lights, those on the model and board and forward and reverse indicators, the board will not function, the receiver is powered up and lights up but the board is giving the signal of no radio connection yet it is, or low voltage but it is not???
The puzzling part is if i connect a slightly used NIMH pack say around 7.5 volts the board powers up first time every time, even when i connect a 6v NIMH pack it functions correctly, but not with a fully charged pack. It is as if something is limiting the voltage going into the board at a set voltage
Does any one have any ideas how to fix this issue its driving me nuts..thx
Regards.
Sub.
3
« on: September 03, 2021, 06:16:41 PM »
Hi Jhamm. Thats great work, a really nice model. Thanks for sharing.  Regards. Sub.
4
« on: September 03, 2021, 06:02:06 PM »
Hi.
Don't know if this will help....but i have come up with some good solutions for my latest scratch build by using the mixing function on my Turnigy 9x ( not a million miles from a flysky tx.)
Using mixing on the Tx i have opening hatches on the throttle hold switch and the MG and Cannon fire on a 3 position switch, centre both off up mg, down cannon flash and recoil, by setting 3 mixes on the flap settings, plus all the usual f+r, left / right, turret turn and elevation etc, i even have turn indicators from the io ports.
The turret stick also switches on running lights and 2 sets of headlights, engage / disengage transmission, just set the turret turn delay to max 0.5 seconds, more than enough to quickly flick the stick to the light position without the turret moving.
Its worth thinking about the mixing settings as you can do some great things on them and gain extra channels, i certainly have after running out of the standard 8 channels.
I now have 13 functions from a standard Turnigy 9X.
On one of my models the smoker port controls a servo that rotates the commanders gun sights ( I dont use smoke machines )
Hope its of use to someone.
Regards.
Sub.
5
« on: July 20, 2021, 05:42:40 PM »
Hi Mr Jahmm
Very, very nice Chieftain in the Berlin brigade colour scheme, just finished doing the same scheme on a scratch built British FV432/30 bulldog in 1:13 scale used in Berlin at the same time as your Chief.
I can confirm that with careful use of a quality masking tape this scheme is do able but skill is required too with a good airbrush and patience, took me 2 weeks to paint mine and as Jahmm says most of that is masking up.
Regards
Sub.
6
« on: May 29, 2021, 03:23:57 PM »
Hi Luke.
Many thx for all your time and patience with these questions, come to think about it the ESC have there own mosfets fitted so bit of an uneducated question on my behalf really LOL.
Thank you once again, other than a BEC / separate supply votage for the servos it looks like i am there WOHOO.
As an aside the vendor i bought my Megas off sent me a replacement today, took about 3 seconds to connect and download the firmware, so to test it i downloaded the saved settings for the first Mega i had just done and everything was perfect.
So it looks like the other had a defect.
So i now have 2 more working TCB's.
Once again many thx to you and those that have helped.
Regards.
Sub.
7
« on: May 27, 2021, 05:12:19 PM »
Hi. Well. Here is where i am at today. Rx plugged into Mega and recognised, OP opened up and all radio settings added, settings updated for the tank it is going into and preferences written onto the board all without any issues. Radio functions tested whilst in snoop, all brake lights, forward and reverse (red / green) indicator board lights working and correct way around. Lights 1 and 2 functional, mg light flashes, cannon fire led flashes when ca nnon activated. Servo 2 steering works, turret traverse servo works when placed into Rc output. barrel elevation works on servo pan. This was tested with just 1 servo being moved to its relevant pin number. Left / right turn indicators work and turn off with steering. Engine start / stop works and i can engage and dissengage transmission. The only thing i could not get to work was the recoil servo, snoop said the cannon was firing but the servo didnt move but led flashed.... Edit re above...now have recoil servo working, turned out i had looked at Sergeys schematic which is NOT correct as he has recoil in servo pos 4, pin 26, i found the error after going back to read the pin position PDF, for the upteenth time... the recoil servo is pin 25 servo pos 5. Dont know if that is how Sergey's radio is set up BUT for any other newcomers like me, just go off the PIN PDF and be wary of some one else's Arduino set up schematics. If i wish to use a heng long motor gearbox for turret traverse i take it i use an esc connected to pin 27 for signal and then one of my mosfet modules for power and ground ? or will the Mega be able to pwer the ESC on its own. Also need to connect the Taigen sound unit to see if that works. Just gone about as far as i can now without some advice....its working well though it appears.  Regards. Sub.
8
« on: May 27, 2021, 10:29:38 AM »
Hi,
Me again....at risk of becoming a PITA, i think i have have grasped the MOSFET module and an application i could use it on, I SAY MAY have grasped it.
If i apply 6v to the vin and gnd terminals, my servo + and - manifold to the V+ and V- terminals, then connect pins gnd to the Mega and sig to 5V pin on the mega when i switch on the mega it will provide 5v to the mosfet module switching it on and supplying the 6v from the battery plus about 1 to 3 Amps to the servo manifold if i use a heat sink over 1 amp.
Or am i just deluding myself....
Sub.
9
« on: May 27, 2021, 10:00:49 AM »
Hi chaps.
Thx for you reply...so if i understand you correctly, the esc would provide about 2 amps to the board but this would only be enough to power 1 servo at max stall ?.
So i would be better off using a separate power supply for the servos as then they could draw what amperage they require from the battery with a 6 volt regulator and just wire the servo signal wires into the Mega then leave the Mega with its own 7.2v supply from the ESC, bec to run the board and Leds, and just connect the grounds together for Mega and servos.
I have been looking through my electronics spares box
I have found 2 MOSFET modules pics attached, i think ( from my limited electronic knowledge that these could be used with the mega for switching Higher amp load applications, is that correct and for the LEDS if i need more than the 40 mah that the mega can supply.
A lot of questions so i apologise in advance chaps, bit i am trying to learn and improve my electronics skills and knowledge...or err... lack of...LOL.
regards
Sub.
10
« on: May 27, 2021, 05:06:40 AM »
Hi, thx for the info and encouragement.
Re the servos, if i use the BEC of the speedo will that be ok or will that be limited with going through the mega too.
Or if i just use a separate power source for the servos and speedo but link all their grounds up to the megas ground will that be ok.
Regards.
Sub.
11
« on: May 26, 2021, 06:32:35 PM »
Well, wired up my Mega to fit my receiver, connected dipswitches and input button, the large manifold on the right is for servo pos and neg for the tank it will be going into, also red / green leds for board read out.
Bit of a rats nest at the moment but will be cleaned up if it works, now to set radio up in OP config. I will unplug the servo connections for setting up.
Sub.
12
« on: May 26, 2021, 10:25:07 AM »
I have now concluded it must be a defective board on the communication port, it has been returned to the Vendor.
Sub
13
« on: May 25, 2021, 12:08:20 PM »
Hi Luke. So here goes, I bought 2 Mega 2560 and connected them up in turn, found the com ports shown, installed the jumper from A12 to gnd. downloaded the DIY TCB hex file and Flashed one straight away and was able to connect the TCB and all was okm awaiting radio etc. Now the other one, I did exactly the same, it stated com port 5, but it would not flash the firmware, it kept stating wrong com port, I could connect to com port 5 through snoop and it showed connected, but again i tried to flash from snoop and it disconnected saying wrong com port. tried snoop and it connected to com port 5 ?. I have the latest OP config and latest Firmware so am now stuck anyone any ideas ? 
14
« on: May 25, 2021, 10:17:55 AM »
Oops re the LCD screen, that should read 2.8 TFT lcd Shield V3
15
« on: May 25, 2021, 10:09:00 AM »
Hi Luke,
Outstanding service as usual, many thx for your super quick reply.
I did read that posting and thought it was the A8 and A9 pins that were utilised so looks like i am understanding the general gist of things LOL.
The LEDS i use only draw 10 ma each so i should be fine, thank you for pointing that out.
I was graciously gifted an Arduino Uno and the LCD screen that goes with it plus various other bits by a good friend and was wondering if this screen could be utilised some how with a DIY TCB using a Mega board, all the pins correspond to each other, or is my brain going way too fast for my skill level at the moment ?
It would be cool if it could be used to show what the board is doing some how, even if it was only current voltage of the battery.
Once again thank you for your time.
Kind regards.
Sub.
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