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…
This show the 7 x 5-Wire stepper with the intended connectors and an example of the stepper connected. I have 2 errors on this Hat – firstly I have the +V on the wrong side, so I have to turn the connectors around. I will just use straight connectors for testing. The second is that…
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…
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…
This ESP32 Hat work perfect on IO, but as I switch on Wifi it short-cut and reboot. I might have encountered my first bad ESP32 module, but I am not sure yet. I need to assemble another unit and see if this works as this is the first time I assemble this board. This is…
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…