I don’t get much sense out from the INA210 at 0 – 2A. Firstly I realize that I use a far to large Shunt resistor. I use a 0.1R by mistake. 100mA would give 10mV that amplified with 200 should be 2V. At this size the Shunt become my weak point. At 3A it starts…
I fancied testing my MC4X15A motor controller as the driver for a PSU. The code is very simple as I bit-bang a PWM with 50% duty and use filter consisting of a 100uH coil and 1000uF capacitor. The result was quite good. I did however notice some input ripple. As I also scoped the Lab…
I am so far happy with the MC4X15A PWM channel with the exception of the current sensor. I have 3 more channels to solder up, so I will do the next without the low pass filter for comparison. I did not like the scope pictures, but will be interesting to see what I can do…
This model is not complete, but it gives an idea. I still lack the battery and the TF Card. The objective here is that I need a low cost CAN Adapter with Wifi to create an adapter that always work as an Analyzer as well.
These are the two different PSU’s used on MC4X15A – notice the supercap X20. I mounted a 0.33F Supercap for the purpose of keeping the MCU alive during powercut’s + act as a spike absorber on 3.3V. I am impressed – the PWM cut instantly, but Led’s and MCU keeps going for several seconds.
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.