From 69ee9e39d0859d81ec1e04448ca9d21c50e29f8c Mon Sep 17 00:00:00 2001 From: Ruben Castro Date: Sun, 18 Nov 2018 21:05:01 -0500 Subject: [PATCH] Update README.md --- README.md | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 17139f7..edf6506 100644 --- a/README.md +++ b/README.md @@ -35,8 +35,31 @@ BOTTOM +A few concerns here arise with v2.0 that need to be addressed by checking some +parameters in person, which I shall do tomorrow. +Problems +___________ +The fill for GND that goes towards the Motor GND has a choke point at the corner +due to the headers for uploading code being right next to the power and GND sources. +To solve this, I will move the MOSFETS towards the left and up, enough to get +a decent amount of fill, but before then, I want to check how the physical +mounting of the programming female headers fit with the male headers on the board +to solidify the perimeter of the board. +The highest value that I have been able to get the ADC on the ATKBBB to read +is 1.5V. I need to test it again with every possible combination detailed in the +manual to see what the actual max is to consider changing the size of the +shunt resistor. Right now it is set to 7mOhm, which would return to the ADC +150mV/A + + +Solved Problems/Interesting Challenges +_________________________________-- +Due to the way the PWR and GND are conected, I had to get creative with the GND +planes. With the limited knowledge I have gathered. I limited the motor GND to the +TOP plane, and kept the Bottom ground plane as clear as possible for the Gate Driver +, which required some creative routing of some components. @@ -75,9 +98,13 @@ Always have a ground plane. Try to be as symmetric as possible Differential pairs routing for pairs of traces. +Many many more to be copied from my notebook soon. - - +Sources: +MOSFET: https://www.digikey.com/product-detail/en/alpha-omega-semiconductor-inc/AON7410/785-1581-1-ND/3621507 +Gate Driver: http://www.ti.com/product/DRV8701/technicaldocuments <<< A bunch of great resources there for general pcb layout knowledge. +General TI-DRV-style Motor Driver PCB Layout manual: http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=slva959&fileType=pdf +Great Resource on ground planes - https://www.maximintegrated.com/en/app-notes/index.mvp/id/5450 -- GitLab