lemmings
Member
Hey everyone, I'm making a teensy synth that I want to be able to play with my m-audio mini usb-only keyboard--and plug directly into the teensy synth without any computer or USB-DIN/Serial converter. I've decided to use a Seeeduino (SAM21 mcu with USB host capability) as a usb host board instead of the Arduino USB host board (cheaper, smaller). The PJRC guide suggested using at least a 120uF capacitor just to account for the sudden current draw that occurs when plugging in a USB device that will be powered from the same source as the teensy. Does where I place the 120uF especially matter? Should I place it right in front of the Seeduino VIN or near the Teensy VIN, or does either work? Also, is there a reason the guide suggests only a 100uF capacitor if not using a power supply? USB Host Shield Library, For Connecting Other USB Devices
I'm only planning on using small low power mini keyboards with this project, so I am not worrying too much about needing a power supply, I think the standard 500mA should be fine to run everything. I've attached some screenshots of my schematic if that helps. Also I am using a PowerMUX board and voltage regulator for the optional use of a power supply, the power mux board limits current to 2.0A max. Thank you!
I'm only planning on using small low power mini keyboards with this project, so I am not worrying too much about needing a power supply, I think the standard 500mA should be fine to run everything. I've attached some screenshots of my schematic if that helps. Also I am using a PowerMUX board and voltage regulator for the optional use of a power supply, the power mux board limits current to 2.0A max. Thank you!