Funny how things work out some times. I initially planned for this to be a more narrow board, but had to extend the height to 40mm due to MCU and connectors. This left space unused on top and bottom of the driver making it easy to add mounting holes for an adapter and now a…
One of my main concerns for some time have been to find a free development kit that actually works for Raspberry PI. I intended to develop directly on the PI, but the drawback with that is that I need a 3rd screen + keyboard/mouse and I simply have no room for it as is. The…
Earlier I had a BEMF issue with my smaller motor controller, so I have been reading up on other peoples experience and solutions to design my own. What I came up with is 3 changes on the MC4X15A. Added a 0.33F super capacitor on 3.3V protected by a TVS (on the back) at ca 4V.…
The original current sensor logic will use a shunt between the lower HEXFET and ground (low side current sensing). This is fine for 3-phase, DC or Stepper motors, but it will not enable measuring of current on a single, stand alone Half-Bridge. An alternative way of doing this that fix this issue is to measure…
Finally had the time to assemble a 32 x Servo Hat. Have not written any code for it yet, but always nice to see SWD answering and led’s coming up with a 10mA current on the lab psu – Things look normal. Will get down to wrapping up a servo controller and assembling a…
First actually finished draft. I call it 0.9 because I plan some minor changes before I send it out. Firstly the size did not work out as expected. I ended up using 40mm width due to the MCU and mount holes. I first extended it at bottom to get M2 mounting holes. Later I had…
This Motor Controller is still a bit of work in progress, what is remaining is the communication parts and a review of protection logic. The actual challenge here is size. I am mounting components on both sides to get it small, but as it get smaller the PCB routing get far more advanced. I am…
This picture is a Dual DC-/Stepper- Motor shield for Arduino. It is available on various sources for ca 5.- USD +/-. The Picture is borrowed from one of the shops on AliExpress. The interesting thing about these monster chips is that they are full H-Bridges capable of working up to 40V with a 30A continuous output.…
This little fellow have the same layout as a classic 7805 and is a 35V to 3.3V switched regulator capable of 600mA. The circuit handle 42V, but the capacitors will limit the circuit to 35V I think. I just fancied making this as a bread-/vero-board breakout. The entire circuit is 20×10 mm and occupy less…
I was initially quite happy with the way this cable fitted, particularly as I found a trick on how to solder these. But, this is how it looked after having fiddling with it for a day. I could add a proper micro match connector, but they are a bit expensive. Another solution is to add…