Dear all, I am not completely sure where my problem is but I think I have narrowed it down to its core and it seems to be a power (stability) issue. Solving it might be a hassle but maybe you can help.
I have a 3Dtouch sensor from microchip: https://www.microchip.com/DevelopmentTools/ProductDetails/DM160225 And I also have a Wifi USB dongle from Edimax: https://www.edimax.com/edimax/merchandise/merchandise_detail/data/edimax/global/wireless_adapters_ac1200_dual-band/ew-7822ulc/ Both are connected through USB to the beaglebone, the 3Dtouch on bus 002 (the USB bus on the pins) and one on bus 001 (the micro USB OTG connection) using a micro USB to USB A female adapter. The board is powered with a duo cell LiPo using a step down regulator from Pololu (5V, 5A) on Vin and VB and Vin-USB (pin 1-1, 1-5, 1-7). Sensordata from the 3Dtouch gets distorted by the Wifi dongle and I suspect that interference on the power bus is the cause of it since a stronger power regulator does help somewhat in stabilizing the issue. Furthermore using a USB extension cable on the USB wifi dongle reduces the problem substantially. Such a cable on my project would aesthetically and practically not be preferred though. From the schematic of the board I see that USB1 and the micro USB are connected with a ferrite bead (FB1). 1. Would it be an option to remove FB1 and power USB1 separately from the microUSB? 2. Would it be possible then to power the USB bus 002 with the sensor board on pin 1-5 and 1-7 and the rest of the board including the micro USB bus 001 through V1-1 with a separate power supply (separate power regulator)? 3. Should I also do something with Vbat? And of course would that probably solve my problem? Or does someone else recognize my issue and has a better solution? Thanks for paying attention. Best, Hans. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/eab38679-4cf6-45cc-9687-d68b05842e44%40googlegroups.com.
