Good news is that TPS54160 is working. C5 & C4 did the trick of getting me past 35V input. I tested 50V In for now. Minor is that the values shown on R1/R2 and R5/R6 are wrong. R1/R2 can be dropped to always enable the DC/DC. R5 needs to be ca 140K for 12V, the…
These are the 4 different motor drivers I have made so far. The smallest (at left) is capable of 24V @2A. It uses DRV10983 and one of the smallest STM32’s. I got it working, but I had some trouble controlling the logic to behave. The second one uses a DRV8313 that basically is 3 x…
This is the diagram of an Unipolar Stepper Motor with the 5-wire connector at right. The most used Unipolar stepper is the 28BYJ-48-5V pictured below and this is the target of my 7x5WStepper Hat. This is a high quality/low cost stepper available for < 2.-USD. I purchased one for test and was quite take by…
All MCU vendors will deliver some C code they call “HAL”, while I call that Low Level Drivers (or BSP – Board Support Package) and implement my own HAL (Hardware Abstraction Layer). A proper HAL need to abstract from hardware and secure portability of code. But, most important is that I want to write source…
I use CubeMX to verify the wiring of my Boards and one of the features I like is that it auto-generate a report like the one below. Just click on the link and you can see the full report of the 7xStepper Hat. 7x5WStepper This is basically information that is very handy to have available…
My STM32 Tester finally arrived, and 12 rejected MCU’s which is ca 40% of all STM32F405’s I had is the result. The sent me a different tester than I ordered, but it did the trick. One MCU broke under testing as well. 10 x STM32F405RG cost va 45.- USD from China and ca 90.- USD…
To effectively have a small production line you need to have 3 pieces of equipment/processes. First step is using a stencil to apply solder paste. this can be done with a stencil alone as a mask on top of a PCB, but a better way is to use a 200.- USD stencil printer. This pic…
One of the challenges I face is that I would like to start producing electronics in volumes, but assembling at an factory is expensive. It easily add 50-100.- USD to unit cost at low volumes and I don’t have the financial backing to go high volumes. One alternative is to use an Asian factory, rather…
I do at present have 8 PCB’s + 3 designs I have not ordered yet in my modular control system, so I have a far to large backlog of electronics that need testing and code. The difference with my last 12 x PWM Hat is however that it target a project – my upgraded 3D…
I decided to Change the 12 x PWM Hat to use High Side Current Sensors. Below is the schematics of the new sensors. This means I measure current out on each PWM signal. Using high side sensors actually simplified the routing so it was a straight forward change. The reason I started with low side…