Assembled and tested my Micro DC Motor Controller. Running the test motor on 50ma in the picture. Added a coin to show how small these boards actually are. A few mechanical issues only. The SWD connector is “ok”, but it is a bit close on the MCU. The screw terminal (blue) is almost on top…
I would like to make a small 3P Motor Controller for 20A and it’s plenty of SO8 size HEXFET’s that can do the job. The challenge is how to get the PCB to support this without going to large. I made this draft that I will try out. This is a snap from the EDA…
2nd draft of a mini 2 x Stepper module. The connectors are wrong, but they have the same footprint as the ones I need. The size is 55mm x 15mm, but I actually want to draw a mini 3 axis simply because 50 x 50 PCB will be cheaper. Drawing is easy so it’s worth…
This is the first draft of a 7 x Stepper Motor Hat. It target uni- or bi-polar steppers up to 500mA per phase like the 28BYJ-48. It also have 7 x end-point connectors. Using the ULN2003 as driver it also provide generic PWM and digital ports that can be used as such. The PSU is…
I tend to end up with ST on MCU and TI on motor drivers. This is accidental as I always look for what is out there at a reasonable price and availability. I started with DRV8313, but abandoned it because the PCB ended up to complex for a 1A controller. Looking for a simpler concept…
Luckily I have a dev board on STMF030F4 that I also can use for verification. The board work (Motor driver not connected), but (1) debug don’t work from CoIDE on this device and (2) the printf() I pulled from the CoIDE repository is unstable. It is the UART driver itself that is unstable, so this…
It is always exiting to receive PCB’s. I am looking forward to work on this one because it is a very small (40 x 12 mm) 3-phase Motor controller. It is designed to communicate using RS-X and control the motor in the background. The block diagram show the components on the board. Communication is RS485,…
I did earlier state that many of the STM32 series are pin compatible making it easy to scale up. I have to my surprice discovered that this is NOT true for STM32F405Rx versus other R series. I just mounted a F405 on a F103Rx design for testing and it did not work as expected. Paying…
This is Revision 1.0 of the R breakout boards. I already made Revision 1.1 before I received these because I realized I needed a few led’s on the board. This board can be used on several R size STM32 MCU’s. The board contain the MCU will all pins available, a SWD connector, PSU and a…
As mentioned before I am a big fan of STM32F105RB as the smallest MCU that I use unless package size is an issue. I have other preferences for LQFP48 and TSSOP20. What puzle me is a comparison between STM32F103RB and STM32F105RB on functionality and prices from AliExpress. I suspect that the reason for the low price on…