This shows and early draft of rev 1.4 on KiCAD using their normal 3D model. KiCAD have a more realistic version that is a bit slower to draw, but for all poractical purposes it does the job. Accurate details is IMO not important here, the objective is to verify as much of the mechanics as…
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…
Started to make a few modifications on PWM12 Rev 1.3. replaced spring terminals with 2.54 pitch screw terminals. Discovered that if I mount them on the edge I can access the screws. And I did not like the spring terminals at all. Also removed the 5V connector and added SPI resistors.
I have used these on the PWM12 Hat and the one I have mounted was worn out after 3-4 times of inserting and removing a wire! I am not impressed!
Designing a PWM Interface is easy, but using ST’s “HAL” layer requires a bit of testing. A friend of mine decided to write his own drivers because he believe ST’s drivers are over-complicated and too low level. I agree, but I prefer to make my own C++ Abstraction Layer on top of the drivers. So…
This puzled me because the 4 circuits on PWM12 was copied from the working motor controller, but looking at the schematics I suddenly realized that 3.3V out from the buck converter is connected to ground – which explains why I draw 10mA++ extra current and why the internal logic don’t respond – it was shorted.…
This screen shot is from MC3X60V3A that also uses DRV8313. I fired it up and looked at code because I need a reference as I try to understand the errors I have on the PWM12 board. I use the same circuit, so I am puzled. Trapsoidal algorith is a 6 step brute force algorithm where…
I have used DRV8313 in a project before and it worked well, but on my PWM12 Hat I seem to have 2 busted chips so far. I selected both from the same batch, so I will add a 3rd from a different batch and see if it works. PWM12 is a very simple Hat and…
We are getting closer to x-mas and I am about to start setting up led strings in my garden. I have a load of 12V and 24V led strings, so I plan using my PWM12 Hat as LED Driver as illustrated below. The system set up is straight forward – I use a number of…
A quite like UML State Diagrams as they give a good high level view of what happens in the code on functional levels. I was first introduced to this by a tool that actually let you create embedded code. This overlap a bit with PLD, but it creates a better overview of event-flow and an…