The yellow line is 5V and the blue line is 3.3V. I connected my scope to see if I saw something and the good news that it is not an interference problem at all. I basically have a horrioble ripple situation out from DRV8213. This indicate that my capacitors are not doing its job at…
Testing Thunderstick I started to notice strange behavior as I increased MCU frequency – in fact I am unable to tick the MCU above 84Mhz powered from the DRV8301 Buck Converter. This indicate that I have interference between the Buck Converter and the MCU on higher frequencies. To prove my case I powered the board…
This MCU was hard to re-solder. You can see why by looking at the picture. I had a heck of a challenge with removing short-cuts and making sure every pin was soldered, but finally the Led blink normally and current usage is back to 10mA. Another modification I need on some of the motor controllers…
What I have done here is to draw the circuit for DC-Rail and copied 2 resistor values without changing them – doh. I also assembled according to this and testet 30V, meaning I have injected 15V on a 3.3V ADC port – hmmm – wonder if that still works 🙁 To make things even worse…
I have a strong preference for making some doc I call “Annotated Schematics” as I start coding and making a project. This doc break up and explain the schematics, programming info etc and everything I basically need as a SW developer to get going. The annotation above is the 3D model annotated to show content…
The wires and caps are a bit tricky to get right. the cap should actually be the other way, but I need access to the SWD so had to bend it over the MOSFET’s. This mounting is not ideal, but it is working. It is a 2000uF 63V Electrolyte that is mounted. The only thing…
Finally mounted one unit, only lack capacitors and power wires and we can start spinning motors. I assembled 5mOhm shunts for now to experiment + I used 30V/100A MOSFET’s since I have few of the 60V and this should not be using 60V on this anyway. I will limit testing to 12V and 24V which…
I started assembling Thunderstick and also start finding things I need to change. Mostly small things except one schematic error on the buck converter. It is not fully assembled yet, but 3.3V is working and it’s time to run the MCU. The mechanical mount holes are to close to ground, meaning the bolts my connect…
My Thunderstick PCB’s arrived some time ago, but it has been very hectic at work so I simply had no time to work on it. I also have a new 1kw motor that will be nice to test. The pictures above is the board with DRV8301 mounted. I have to start with this because…
This is the Ethernet board 3D from front. This 3D model is a bit ruff, but it serves its purpose and looking at this I realize that the RJ45 connector is to high. This is not critical as I can adjust hight by extending the pins to the next board (not shown) and use extended…