USB to tablet and charging tablet at same time.

[Henry]

We want to use a tablet running shadowdash as a dash in our racecar. We want to use a usb conenction for stability, but also need to charge the tablet at the same time. Is there a way to get power from our MS2 and have sensor connection at the same time?

[nathaninwa]

I went through this with my ms3pro. It does data only with no charging. I found a product called Vener8 which allows takes data in and power and charges, transmits data to the tablet. I'm running a Dell Venue 8 twblet

[Henry]

Cool. Thanks. The webpage mentions drivers. Do you know if it will work with an Android tablet?

[rickb794]

You cant say stability and USB in the same sentence.

USB does not tolerate the electrically noisy automotive environment well.

You will notice the USB adapter that DIY sells has NO CORD, there is a reason for that!

USB operates at a milli-volt level, RS232 runs at 5v.

[Henry]

So, I should use a bluetooth adaptor and pass data from the MS to the tablet that way?

[rickb794]

Seems like it might be a solution.

[bbbrad]

If running a bt adaptor and a USB for charging, can you please tell me if the Bluetooth disconnects during cranking?

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[bbbrad]

Found this...
Power from PIN 9 - Many of the better RS232 Adapter, but not all offer the option to power off of pin 9. This lets you just plug the Adapter into your v3.0 or v3.57 MegaSquirt and the BT adapter will be powered by the MS with no extra power line. This is much more convenient and automatically powers on the Adapter when you power on the ECU. However this can be troublesome if you are trying to diagnose an issue while cranking your vehicle; each time you power cycle the Adapter, The PC or Android device will need to re-pair with the adapter and recreate the virtual com port. This will cause a delay and you will not be able to communicate with your ECU for 15-30 seconds. This is likely not a big deal for normal operation, but if you are diagnosing a cranking issue you will either want a cable or a separate power source for your BT adapter.

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[Bman]

While you can power off pin 9 on rs232 make sure the volts are the same, if not use a converter.