Other Parts Discussed in Thread: BOOSTXL-CAPKEYPAD, , MSP430FR2672
We're designing a keypad with 3x5 capacitive touch buttons, where we want wake-on-proximity functionality. I have the BOOSTXL-CAPKEYPAD for testing, and it seems to work good, except that it has 3 buttons less than what we want.
I have set up 3x5 buttons in the Captivate Control Center and added the proximity sensor. When clicking "auto assign" I got the following error: "sensor proximitySensor, Electrode TX00 is unconnected".
I connect TX00 to one of the pins and it seems to be happy.
Is this an okay assignment, or do I have to use another MSP430 with more captivate IOs to get this working?
What I really want is to get the best proximity sensing distance possible? Please see the screen shot below for our very premature Keypad PCB.
-Would it be possible to use one of the TX channels and increase it with a track surrounding the board. And sample all RX channels at the same time to achive a sensor as large as possible?
-Or is it possible to use the RX channel(s) as both a self-capacitance sensor for proximity and later as mutual capacitive sensor when the device is awake?
Please let me know if you can guide me in the right direction having a 3x5 keypad with proximity using the , or if it is necessary to switch to one of the larger MSP430's?
