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MSP430 Touch pro tool

Rajasaravanan Nagaraj
Prodigy 20 points

Other Parts Discussed in Thread: MSP430G2553

Hi everyone,

I am using MSP430G2553 to detect the change in capacitance and view them in real time using the MSP430 touch pro tool. On the Y-Axis of the touch pro tool I could see the default description as "Channel Data". What data is this..?? Is this value the no of oscillation counts..??? And am using the RO method to detect the change in capacitance. 

  • 0
    TI__Mastermind 23005 points

    Rajasaravanan Nagaraj,

    The Y-axis of the data being reported is arbitrary.  The Touch Pro GUI just plots whatever data is reported to it, regardless of units.  Therefore, it is necessary for the user to understand what the data is that is being plotted.

    Are you running one of the demos that ships with the GUI without any modification?  If so and you are also using the touch sense boosterpack, then there are two possibilities (the demos support both with commenting out a #define line).  The first (and default, I believe) is that each of the 4 buttons on the wheel is reporting the "delta".  The "delta" being the difference in counts between the baseline (no touch event) and the current count level (with or without a touch).  The other configuration reports position along the wheel.  This reports a number from 0 to n, where n is the number of possible positions you are trying to realize (I think n = 24 by default in the example).  If no touch on the wheel is detected, it reports a number significantly larger than n (50 in this case).

    For additional information, please see the Touch Pro Gui Users Guide in your install directory (defualt:  C:\ti\msp430\TouchPro_1_01_00_00\32bit\SLAU486_TouchPro.pdf)

    Mike

  • 0 in reply to Mike Pridgen
    Prodigy 20 points

    Thanks Mike. Yes I am using the default Coding given by TI (TouchProTool_Demo_Bit_Banging). But instead of the Booster pack I connected one of the out pins of MSP430 (P2.1 the pin which connects to the left element in the booster pack wheel) to a Capacitor in a Breadboard. When I add another capacitor in parallel the no of counts increases. But in RO method Capacitance is inversely proportional to the no of counts right. So why does the counts increase when I add a Capacitor in parallel.??? And I have connected the other end of the Capacitor to the GND pin of MSP430. 

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