This is an early draft of a 12 x Analogue Input Channel board. 12 single ended inputs and 8 delta channels – all fully galvanic issolated, 24 bit sample precition and 64Kbps sample rate. The board uses the same box as 3xCAN, but goes wall to wall – each M12-6 Female connector hold 3 analogue…
What you see is my dev box with the new front and back panel attached. This has so far worked out very well. My solder station broke before I could assemble Ethernet components, but I have a new one next to me. As always – with a project this complex it is lots of mistakes…
Just the back-side of the 3xCAN box this time showing holes for Ethernet, SD-Card, USB and Power. The power connector is not 100% yet as I lack components. Getting a 3D printed panel adapted is a lot of try & fail, but I got it right in the end. The left side have room for…
I finally assembled my first prototype box using a 3D printed panel. The first change is that the front had to be reduced to 5 x DSUB9 connectors because I needed extra space between them for the connectors in front – even 5 might be ambigious, but we will see then the canles w/connectors arrive.…
The D-Sub 9 to right contains the pinout for CAN. And As I use a flat-cable to connect to the header to Left I also did the mistake of assuming that Pin 2 on the header is pin 2 on the D-Sub 9 so my pinout is completely messed up. Looking at the left header…
CPU load in out case is a definition – if I say that a cycle time of 100yS (0,00001 Sec) is 100% CPU Load then the data above indicate we have 10% CPU Load – if we say 1ms is 100% we are at 1% CPU load. We use in average 10 yS to execute…
The idea is to have 1:1 between connectors and D-SUB9, but for testing I just connected all three on the same cable with a D-SUB9 for Laptop connection. This is a stanadard 10x flat cable. Pin 10 is shield if needed. I have not connected 5V and GND on D-Sub9, but I will in the…
Got more parts today so I finally have connectors, USB and SD-Card mounted – lack Ethernet yet + discovered that the PSRAM has a more narrow footprint than I used. Not sure I am bothered with mounting PSRAM on this version because strapping another nCS will be difficult – one nice thing with narrow footprint…
As you build a modular system you will implement a lot of variables in each module that you might want to change as part of configuration or see as they are sensor values. To do this I create a separate module called a “Dictionary” that is illustrated below. The dictionary itself is a large Index…
I am waiting on parts for the USB, SD-Card, Ethernet and Modules so the next task I can work on is the CAN interface. The actual barebone CAN interface is autogenerated by STM32CubeIDE in C, so all we need to do is to create a proper IO queue, deal with timing and error handling. Most…