The first thing I noted was that my current readings went into negative voltage, so a bit research and I moved the ref pin 1 to ground – it seems to work better. I won’t know for sure before I activate the ADC and print readings. INA210 is supposed to have gain 200, but I…
These two scope pictures stunned me before I realized the mistake that stunned me even more. The first picture show HEXFET Output in yellow, Logic High/Low Cyan and Purple and BEMF voltage in Blue. The upper picture is with no load and the 2nd is with a DC motor as load. Why do my High…
This schematics show the PWM driver stage of MC4X15A. IRF7862 is rated at 17-21A continuous current and pulses as high as 170A, but yesterday I took out two simply because I replaced IR2103 with IR2101 and did not realize that the later have no short-cut protection – so the MCU switched on both High and…
I wanted to share this picture of a INA210 through a microscope. The size of this component is ca the same as a 0603 Component with 6 pins. It is small, but soldering it is not the issue – this bugger have 6 pins and where is PIN 1? I assume it is top left…
My main concern about the 3.3V PSU ripple is this schematics. It is the current sensor of my MC4X15A Motor Controller. As 3.3V is used as reference and ripple I might see sensor variations I don’t want – basically adding to the sensor noise.
This scope pic is from the 3.3V on my MC4X15A – Universal Motor Controller. The MCU is running and I have the 0.33F Supercap mounted. Ca 200mV point to point ripple is to much for my taste, but it works and this is far better than I have measured out of the Lab PSU’s. I…
I decided to test my LMR14206 based DC/DC again and replaced the 15uH inductor with a 47uH inductor on the 12V design. The scope pictures was a shock: This first scope picture show what I saw as 12V out. It is 12.2V, but look at that ripple picture of several voltages. To compare I scoped…
Starting at left is a ESP32 Breakout board, then one of my own STM32F405RG breakout boards, a 5″ HDMI, Wireless keyboard and Raspberry PI 3 with my 5 port Hat – and your right it’s a different Hat with screw terminals, so I do have 2 x 5 port Hat’s working. What I will do…
This shows a Raspberry PI 3 with a Communication Hat, Display and mini keyboard. This is basically all the hardware I need for a very advanced CAN Adapter & Analyzer. The main reasons I am skeptical is the wiring needed on this solution. Using a HDMI display is very powerfully, but you need a large…
This is a 5 port communication Hat mounted on a Raspberry PI 3. It contains 3 x RS485 and 2 x CAN ports. The design is not new for readers of this blog, but it is actually the first time I assemble rev 1.1 – just before I am about to order rev 1.2. The…