![]() I also wanted to ask how I would calculate the different values for the resistors, sice we didn't had any resistor math in class yet. I know these are stupid mistakes, and I'm kinda hating myself for them, but still thank you for helping me with my first major project outside of high school physics. So first of all thank you for all the answers. Probably it is something simple I'm missing but I do not spot the mistake. The interesting thing about all this is that it all worked out when I tried it with an LED instead of the DC motor. But looking at the spreadsheet of the transistor it looked good so right now I'm at the point where I do not have any idea what the problem is. Since it is somehow still not working I figured out that the transistor has to be the problem. An optoisolator (also known as an optical coupler, photocoupler, optocoupler) is a semiconductor device that transfers an electrical signal between isolated circuits using light. I cut the optocoupler in order to see if the transistor is the problem. NI Multisim Live lets you create, share, collaborate, and discover circuits and electronics online with SPICE simulation included Browser not supported Safari version 15 and newer is not supported. Relay is an essential component for driving high wattage devices which operates on high. ![]() PSpice users can access a powerful SPICE simulator as well as specialty design capabilities like model creation, graphing and analysis tools, and much more. When I am activating my optocoupler nothing is happening. This video tutorial is based upon the simulation of relay in proteus. When you’re ready to create and simulate your optically isolated circuits using optotriacs, you can design and simulate your circuits with the simulation tools in PSpice from Cadence. Just to specify the way this circuit is not working. My problem with this setup is that my transistor is not working and I'm not exactly sure why. The main control mechanism would be a NPN Transistor which would get its base from an optocoupler, since I want the arduino be isolated from the 9V circuit. I have the motor connected to a 9V block battery, so my motor has enough power to run. I'm will probably use the PWM pins of my arduino mini for this.Ĭurrently I am building my first prototype of the setup so I can test the PWM. Use the optoisolator to interface but connect all grounds together and that should work fine.My current project does involve some DC motors which I have to control the speed of. So just get an LM2596 board, connect 12V to input, feed 5 V output to your MCU. So no, the regulator will not separate the ground. Note that almost all (non isolated) regulators actually have both grounds shorted ! You could use an LM2596 based switching regulator and it will have only one common ground connection. Only if you're using an isolated regulator which is not needed and too expensive for your application. "Would the 5V regulator isolate the two GNDs'?" Confused yet ? My point is, such general "do this" and "don't do this" rules are useless if you do not understand the why. In other cases it is completely forbidden (mains adapters and other mains isolated circuits). "I later learn that this should not be done in an opto-isolated circuit."Īnd do you understand why that is ? There are many cases where this is not required and where it is perfectly OK to just connect the grounds. I think that in your case you can simply connect the grounds together. It seems like you're mixing up things that you don't understand. ![]()
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