I have a version of XPortHub that works fine, so I have not been in any hurry to make this 2. unit with Ethernet, but I will finally order the PCB’s. XPortHub is very simple as it is only a switch between USB, CAN, RS485, RS232 and Ethernet. But, that exact functionality is what I…
This is a new version of my 32 x IO/Servo Hat. I have always been a bit unhappy with pin-header connectors since they can be disconnected easily, so I decided to try how a surface mounted 2-pin JST worked out and voila – 32 2 pin connectors with signal and ground. This means I drop…
2nd Draft of my new 32xServo/IO Hat rev 1.4. Added the leds and missing SPI resistors + reorganized connectors at bottom. I notice that I need to add a capacitor to assist D2 (TVS) on the bottom + I want to add 2 jumpers allowing left and/or right array to be connected to 5V as…
First draft of 32xServo/IO Hat. Designed withh KiCAD this time, but still a 2 Layer design. I lack 3D packages for Power connector, USB port, JST CAN port and Q1 Crystal. The Q1 Crystal footprint was my first footprint design, but is was rather straight forward. Next I will have to try adding a 3D…
These two 3D models show my old and new 32xIO. It’s a layout difference, but except for that they are mostly identical. The old board have the DIP selecting CS Pin for SPI, while the new dropped that. Revison 1.1 Revision 1.3 The challenge with these 32xServo ports are that I do not have 32…
This is rev 1.3 of 32xIO/Servo Hat. It’s been a few revisions that I never bothered to build because the original is working well. But, I need some changes on this: SWD need to change to new format. Connection to SPI1 need resistors. 2nd Power connector needs to be added. Connection between motor and 5V…
This drawing is an overview of the Hat’s in progress. A few is only on the planning stage, but most electronics is on prototype level and SW is coming on. Raspberry PI is the obvious core if I need heavier processing. Due to the nature of it’s SPI I can only connect one of these…
This illustrates the BasicPI Firmware Stack in progress. What I always do in embedded applications is to make a “standard” main.cpp as follows: void AppInit() { // wire hardware } int main() { AppInit(); // start OS } A team I worked in years ago agreed on this standard so we should…
This is the last version of the 32 x IO Hat. I just modified it to use the faster SPI towards RPI bus. The Power connector on the right side is for Servo’s. It enables a different voltage than 3.3V supplied from a separate PSU Hat. The jumper need to be set for 3.3V to…