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Premium Member
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100 Posts
Discussion Starter · #1 ·
Hi.

We are checking compability between the the SCP-01 and our Wireless SCS system.

But can anyone describe the output comming from the SCP-1d, as I understand it does not output a recistance value but an voltage value.....correct?

If this is correct we probably can adapt put transmitterbox to handle this signal to as long as I get information of the values.

Anyone has these values?

Happy new year everyone!

Thobias
www.Slotcarsolutions.com
 

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Greg Gaub
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14,670 Posts
I would have no idea how to measure it, but I would bet Maurizio would be able to hook you up with the numbers you need. Check out the slot.it forum for his posts, and send him a private message.

Or, if you tell me what and how to measure, I'll do my best. I have an SCP-1d and an electronic voltmeter with a bunch of settings.
 

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Premium Member
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Discussion Starter · #3 ·
Thank you Greg,
I aminterested in if the controler is giving a resistance similar to the standard SSD controler or if it is giving avoltage signal.
It can be measured by a voltmeter and simply measure on the connector that should be plugged into the base and give full throttle and press the different buttons.

I willsend a PM to your suggested guy also.

Thank you
Thobias
www.slotcarsolutions.com
 

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Greg Gaub
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14,670 Posts
Hopefully Maurizio can help. I can't imagine how to measure the controller output if it's connected to the base.
I can power the controller externally, and hold the meter leads to the cable tip, but I'm lost from there on. I can set my meter to resistance or voltage, I guess, but I don't know if I'll be able to decipher the readings. I'll probably give it a try today, just out of curiosity, though.
 

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Premium Member
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Discussion Starter · #5 ·
Hi Greg,
Thanks, is is actually no rocket sience! :)

The controler can not be connected to the base during measurement, start with measure voltage,if you get 0 or close to 0 switch over to recistance to cover about 30 kohms.

Regards
Thobias
www.slotcarsolutions.com
 

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Premium Member
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4,882 Posts
Best thing to do is to calculate the voltages.

A quick recap on the Controller, The throttle is a 5K variable resistor (0 Ohms is Min throttle, 5K Max) This is connected in series with the LC resistor (8K2) & the Brake resistor (18k) LC & Brake resistors are shorted until the buttons are pressed, which then brings them into circuit.

The bottom of the chain is grounded and the top of the chain goes to an A-D converter in the Powerbase this is also connected to 5V through an 18K resistor on C7030. (3.3V on C7042) forming a potential divider.

So although the throttle is a variable resistor because one end of the resistor chain is grounded & the other end is connected to the supply through the 18K resistor, the A-D actually sees a voltage that will vary between 0V & 5V.

So now armed with this info you can calculate all the voltages. So a couple of exmples.

Throttle at Min, BK & LC not pressed. We will have 18K to 5V & 0 Ohms to ground, so A-D will see 0 Volts
Throttle at Max BK & LC not pressed. We will have 18K to 5V, 5K to ground, so A-D will see 5V / (18K + 5K) * 5K = 1.08 V

Throttle at Min BK not Pressed, LC pressed. We will have 18K to 5V 0 + 8K2 to ground, so A-D will see 5V / (18K + 0 + 8K2) * (0 + 8K2) = 1.56 V
Throttle at Max BK not Pressed, LC pressed. We will have 18K to 5V 5K + 8K2 to ground, so A-D will see 5V / (18K + 5K + 8K2) * (5K + 8K2) = 2.11 V

So best thing is to put together a spread sheet and calculate them all.

As can be seen although quite simple externally the software in the Powerbase microcontroller has to do some clever maths because the range & resolution of the throttle voltages change dependant on which buttons are pressed. In the above examples with no buttons pressed Min to Max throttle is 0V to 1.08V. However with LC pressed Min to Max becomes 1.56V to 2.11V.

All the above is for C7030, for C7042 you need to change 5V to 3.3V which is why SCP-1d which sends out a voltage simulating the effect of the potential divider does not work and you need a SCP-1d 3.3V.


If you want your controller to also function with the SCP-1d easiest way is to copy the Powerbase input circuitry with the 18K to 5V, controller resistance chain to ground, then if your box works with a Scalextric controller it will also work with SCP-1d. If you also want it to work with SCP-1d 3v3 you will have to do some clever stuff in the firmware to correct for the reduced voltage range. If you have a "resistive" output at the Powerbase end then that should be fine for both C7030 & C7042.

Rich
 

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Premium Member
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Discussion Starter · #7 ·
Thank you Rich, it was as I thought then....

I will look into the possibilities in our system.

Thank you again

Thobias
www.slotcarsolutions.com
 

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Premium Member
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100 Posts
Discussion Starter · #8 ·
Just to update the thread.
The SCS system is now compatible with all resistive and voltage based controllers such as True speed and Slot.it. The SCS system can also work as a converter to use 5V Slot.it controller to APB and 3,3V Slot.it controller to PB6 and PB4. No extra cartrige for the Slot.it is needed.

Please contact us for more information.

Thobias
www.slotcarsolutions.com
 

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Vendor
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2,920 Posts
Good job! I haven't been following this development (just came across the thread) but seems a good thing. Glad to know that it can bridge the 3.3V - 5V systems.
 
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