i created a schematic. Does it make any sense?  - Page 1
Forum section: electronics / beginners

author: karatektus
author_rank: Newbie
timestamp: November 24, 2017, 12:50:26 am
content: Hi,since this is my first post, a little introduction probably is in order:I'm Paul, a2930year old webdeveloper from germany. Also I am an absolute electronics newb. I recently got into building racequads because i wanted to do more soldering. That kinda snowballed a little and I just ordered a few naked PCBs to build some ESCs for an electric skateboard (well - a mountainboard but whatever). For that I do obviously need a remote, but couldn't find one that is to my liking.Then i found a guy on a different forum, who built his own remote with an arduino and of the shelf parts which was kinda what i wanted, but still not quite. Therefore I installed CircuitMaker and started reading datasheets.I know have a schematic with a SAMD21 microcontroller, a powersupply, a batterycharger and an usb port. Thats basically everything you need to do absolutely nothing.Since this is the first time I have ever done that I wanted to post that here in the hopes that somebody could take a look and tell me if and where i went wrong before I start and acutally figuring out how to add a display and the rf circuitsThanks in advance!A few specific things I'm not sure about:The stat output of the chargerIC is a tri state output and its relative to the USBs Voltage (so high is 5V) That would be too much for my uCs inputpins. NowI added a voltagedivider to ground so the pin is pulled low when it is not charging (and no usb is connected) and high is only 2.5V so I can sense that as high on a digital pin of my uC. Im not sure if that will work...jI'm pretty confident that the powersupply would work, but I wonder if its too much?Is the way i connect things correct? I mostly just use the bar style PowerPorts to create signal linesAny kind of constructive criticism would be very welcomePaul

author: IonizedGears
author_rank: Regular Contributor
timestamp: November 24, 2017, 01:05:49 am
content: I can see in your schematic that you have grounds pointing upwards in several places. It's a standard in schematic drafting to keep grounds pointing downwards and voltage rails pointing upwards for clarity.Sent from my Pixel XL using Tapatalk

author: tpowell1830
author_rank: Frequent Contributor
timestamp: November 24, 2017, 02:38:41 am
content: Quote from: IonizedGears on November 24, 2017, 01:05:49 amI agree with your your comments, and that is what I like to see as well.To Karatektus, welcome to the forum, the overall look is very nicely done, very neat well thought out. No comments on your design as to whether it will work as designed, but a well planned layout and good look and feel. Although your ground symbols are clearly labeled GND, for form and overall look sake, I make my grounds pointed down, even if I have to go up and turn two 90° turns to get them to point down. Also, VCC pointed up and labeled at the VCC source (at least) of what voltage VCC is set to.Are you planning on using a trimmer or just use a 1% resistor there on R5?EDIT: Corrected typos and rearranged paragraph to address OP. Added resistor question.

author: karatektus
author_rank: Newbie
timestamp: November 24, 2017, 04:51:51 am
content: Heya. Thanks for your comments. I'll change my grounds. R5 is thought as a fixed value but just because i didnt think of a trimmer. Thats probably a good idea. I even have some 10ks on hand.Regarding the pulldown resistors for usb-c: thanks! I didnt even think of looking at the specs.