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…
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…
This 12 x PWM Hat have 12 x high side current sensors. The PWM driver have a separate PSU, DRV8313 is rated 60V and INA194 is rated -16 to 80V so they are not that easy to break giving the Hat a very decent protection level. A separate TVS and capacitor bank on motor PSU…
This Hat was actually a challenge to route, but I managed it at the 4th attempt. I am quite happy with the result as well. Raspberry PI Hat Format STM32F405RG MCU, 32bit ARM M4, 168Mhz, 1Mb Flash, 196Kb SRAM. 42Mbps backbone network. ca 30Mbps With Raspberry PI. CAN Network USB Separate PSU for PWM 12…