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Dr_C

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Dr_C

311 posts

Hi Andy, the point about no brakes is correct but only part of the analog mode story... digital chipped cars have very poor low/medium speed handling in analog mode specifically with ARC PRO... it is to do with the powering up cycle of the digital chip during low duty ratio PWM signals from the ARC PRO. The advice should be digital cars only for digital mode and analog cars only for analog mode.

 

The subject was raised here because a user was experiencing difficulties with low speed handling... wrongly set to analog mode is a possible cause. Hope this helps...

 

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Dr_C

311 posts

Is the lane changing function working? if not you might be in analog mode. When digital cars run in analog mode with the ARC PRO - they tend to run too fast in my experience... and demonstrate the annoying characteristics you mention...

 

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Dr_C

311 posts

Maybe I am misunderstanding the situation - if so please forgive me...

 

1/ the ARC PRO should automatically connect over Bluetooth as soon as the app is opened. This, of course, assumes the bluetooth function on the smart phone Has been enabled.

 

2/ if you use the usual bluetooth search and connect function inside the smartphone operating system then the ARC PRO will not show up. You cannot connect manually to it As you would when pairing other devices such as headphones etc.

 

3/ there is a useful app called BlueLight which you can use to scan for all bluetooth devices in the vicinity of the smartdevice including those which are normally hidden. Load this app and start scanning and then thevARC PRO should show up. Does this happen?

 

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Dr_C

311 posts

Yes, I too believe there are two unrelated issues here.

 

1/ I believe the voltage reading issue points to the need to upgrade PIC18 to firmware v2.4 which we know corrects an analog in-balance of power between the two lanes at full throttle. I believe this relates to how the internal drive electronics generates the required gate drive voltages for the high side output transistors. This drive electronics needs a pulsed waveform to generatr these voltages... hence the sydtem needs to be firmware controlled to never quite reach 100% duty ratio. Well thats my explanation, but the simpler answer... if you are in the habit of driving at 100%... then do the v2.4 firmware upgrade.

 

2/ I believe the effects observed while driving are more likely due to intermittent connections at track joints... IMO.

 

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Dr_C

311 posts

Just a few thoughts from me:

1/ the ARC PRO in analog mode uses a technique known as pulse width modulation to vary power to the motor. Hence, digital multimeters operating in dc have an impossible task - are we loooking for mean dc level, peak level or something else?

 

2/ earlier firmware version (PIC18 v2.1) had a very slight imbalance on max power levels so likely would record a difference on digital multimeters - though in fact the power level differences for cars on track appeared very small.

 

3/ I suspect the problem is not related to any of the above and may come down to poor connections. What happens if the car is held in position on track with the drive wheels lifted up? How consistent and smooth is the throttle control?

 

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Dr_C

311 posts

I did precisely as Woodcote describes and was happy with the result...

 

C

 

https://www.slotforum.com/forums/index.php?showtopic=22159&p=2229175

 

Dr_C

311 posts

It appears that ARC PRO powerbases manufactured from week 14 of 2018 onwards should use an internal printed circuit board (labelled v0.4) that corrects track polarity reversal. These later powerbases allow 2-into-1 connection of lane rails and so do not require the modification to CLCs as described earlier in this thread. They may still require a simpler modification if analog operation is to be retained.

 

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Dr_C

311 posts

TGreat point Andy P, the improved lap counter performance will certainly make it easier to implement random lane changing for autonomous pacer cars for use with the ARC PRO... that nicely reminds me to get the SSD compatible multi pacer car project finished :)

 

Many thanks

 

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Dr_C

311 posts

The ARC app manual, written for all users and with insights from an experienced user perspective... is great! Big thanks to Woodcote, we are all benefitting from his superb drafting and editing skills.

 

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Dr_C

311 posts

And, the two ARC PRO Le Mans sets I have seen recently both have the new updated powerbase. This removes the track polarity concern of the earlier version of ARC PRO and it effectively sorts the LC button press issue when crossing the start finish line. This is a great development!

 

For home race circuits, at normal fast speeds, the lap counting is now fully reliable whether LC is pressed, or not, when crossing the S/F line. For very fast raceways and very fast drag strips there may still be some residual ID read issues when the LC button is pressed for the higher IDs e.g. IDs4-6... In these extreme circumstances a rule of not pressing the LC button while passing the S/F line would still make sense. For the rest of us, who race our cars at normal fast speeds, for the latest powerbase hardware solves the LC button issue.

 

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