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  1. Hellmut1956

    RGB leds color changing help...

    Yes, terrible to always fall in the trap of literally translating when writing in a not native spoken language! But to my contribution. It is lot of fun experimenting and verifying in experiments that what I have in mind actually works as expected or to adapt to what is learned in the excercise!
  2. Hellmut1956

    RGB leds color changing help...

    Why do not take a Raspberry Pi ZERO and modules from China that offer 16 PWM on a cheap board to which you communicate via I2C. I do so to monitor my power panel, has 8 different tensions. For each tension I do use an RGB LED with a transistor to protect the GPIOs of the ZERO. I put a WiFi...
  3. Hellmut1956

    Career or Degree in Electronics

    Why you just go to Coursera and have a look. You could select courses there for free from prestigious universities like Stanford and many others, of go to MIT from the MIT in Boston. You can study courses from those universities and no cost, or a minimal cost, 71,-Euros per course to get your...
  4. Hellmut1956

    How to choose and where to get proper electronic fuses

    Thx a lot for your answers. I am getting the impression that as long as the max. voltage is high enough only the amount of current should be used to select a proper electronic fuse. For the 6 A requirements I have to select a fuse type that has its hold value at 6A and a trip value, assumed to...
  5. Hellmut1956

    How to choose and where to get proper electronic fuses

    Hi, I am building a Panel for my electronic lab and I want to protect it from possible short circuits: This first picture shows a front view. The different voltages coming from a modified PC 600 W power supply are fed hidden to the lower row of receptacle connectors, then fed to the switch...
  6. Hellmut1956

    RaspBerry Pi Zero

    Thx for responding so fast. I am going to use RGB LEDs which have 4 pins, one being in my case a cathode. This means that for each LED I need to have 3 PWMs to control the intensity. The combination then gives the resulting color! 8x an RGB LED results in 24 PWMs! Additionally for capturing the...
  7. Hellmut1956

    RaspBerry Pi Zero

    Hi friends, I have been looking around to purchase a Zero and none of my sources have those in stock! Can you help me why apparently the Zero is not available? I have a bit crazy purpose to study the Zero. I am building a Panel for my electronic lab: Its purpose is to put all the tensions I...
  8. Hellmut1956

    microcontroller or raspberry?

    If what you wrote is really what you want to learn about, than image processing is your objective. I might be wrong interpreting your objectives. A powerful tool and a way to learn a lot is buying a personal license of the software Mathematica from Wolfram Software. If you want to get yourself...
  9. Hellmut1956

    Expanding the data partition of Raspbian Jessie on a USB-HDD

    I will pass this thread to a new project log, so please no further responses here!
  10. Hellmut1956

    Expanding the data partition of Raspbian Jessie on a USB-HDD

    I had succeeded to place the image of Raspbian Jessie on the FAT32 formated HDD with 1 TB, copied the required files to the boot partition on the microSD and have the new Raspbian Jessie start. Now I followed the instructions to have the data partition of the USB-HDD be expanded to include all...
  11. Hellmut1956

    Windows 10...opinions?

    I have installed Windows 10 on an empty HD I have available in my PC. Starting the PC from that HD makes it impossible to access my RAID10 disk on which my usual Windows 7 runs. As a consequence when starting in a way that makes it possible to start Windows 10 I do not have access to my raid...
  12. Hellmut1956

    Determining ratings on stepper motor

    @hevans1944 Share with us when you investigate the topics at Trinamic. I had written that I did chose the "chat forum because it should neither be a "tutorial" kind of thing, I am not even close enough to be really knowledgeable in the field of stepper motors. As I wrote I see in the market s...
  13. Hellmut1956

    Determining ratings on stepper motor

    Dear hevans1944, you should have a look at the site of "trinamic.com. Their controllers take benefit of a deep understanding of the internals of the stepper motors and implement functions that increase the efficiency of stepper motors usage, allow to use lower performance stepper motors by being...
  14. Hellmut1956

    Chatting about stepper motors and their control

    The reason it is a 3Nm torque specified motor I guess. You are right, the laws of physics fully apply to a stepper motor as well. What probably because I am not an english native speaker I miss in what you write and my explanations are poor and may be the cultural differences generate the...
  15. Hellmut1956

    Chatting about stepper motors and their control

    Hi Minder, let me start explaining the responses to my questions.Every time the control circuit changes the inputs to the motor to have it step to the next step, yo may have on both, or on just one of the phases a change of polarity when dealing with full step motion. This change of motion...
  16. Hellmut1956

    Chatting about stepper motors and their control

    All I was writing is what to many is not obvious that any modern stepper motor control system you automátically have the PWM limiting the current to a value to be selected by the user and this he is doing depending which motor he wants to use. The answer of Old Steve did apparently shown he...
  17. Hellmut1956

    Chatting about stepper motors and their control

    Thanks for your response "Old Steve". it proves that a very important aspect of stepper motors is unknown to most, and it is extreme important to know this as it is key to have the best performance available. I will explain why! Both stepper motors offer a performance of 12 W, right? But the...
  18. Hellmut1956

    Chatting about stepper motors and their control

    Great my dear friend Minder! In light of all that wisdom, how do you respond to my question and why?
  19. Hellmut1956

    Determining ratings on stepper motor

    Here I try to give some initial hints: This picture of a very simple 2-Phase-Stepper that has 4 cables coming out explains graphically what Colin Mitchel suggested. Each of the phases "A" and "B" consists of two coils connected in series. Measuring the resistance over each phase helps first...
  20. Hellmut1956

    Chatting about stepper motors and their control

    Hi friends, I have fallen in love with stepper motors and this goes together with studying technical detail about those motors, their mechanical, electrical and magnetic behaviour. recently I listened to a 3 day seminar about motors offered by the "digikey university", if remember it correctly...
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