For example my experience is that Windows 7 will block you from directly writing to the port. If you are using any other language such as C++ where you can directly write to the parallel port, then you should be aware that it will be depend on the Operating System you are using. Since C# does not allow writing values directly to the parallel port I have used the 'Inpout32.dll' that you can download from: It will depend upon the pins you have chosen (D0 to D7). You have to write values (on/off pins) to the data pins of the parallel port. So the completed module contains four transistors inline with four resistors which connects the car remote controller to the parallel port of the computer through it. After finding those points attach wires to them. You have to find the four control points (four points for four switches) of the remote controller and there's one common wire (in Red). Please refer to the transistor data sheets for the above info.Īttaching wires to the control points of the remote controller Temperature Controller 10 products available.

R = supply volt / (load/hfe * (0.77+= (0.77*30%)))įor BC548c Transistor use the fallowing figures Manufacturer of PNP Transistor - TIP32C PNP TRANSISTOR offered by Knowledge Electronics, Salem, Tamil Nadu. Here is the way you can calculate the resistance you need. Ok, so far so good.But again, how much resistance do I need? The answer is it depends on the transistor you are using. The answer is simple use a resistor to control your base current. Note what I said above, that we should send a small current (pulse) to the transistor's base, otherwise the transistor will be explode. And I used my serial port to send a signal to the transistor base, which makes the transistor act as a switch!!ĭo not implement this circuit and try to use it, there's one more thing left to do which is essential. You can use any general-purpose NPN transistor. so I used a BC548c transistor for mine (previously I used a 2SC828). We are going to control these 4 switches via our computer parallel port.Ī transistor can act as a switch, which means theoretically a small current flowing to the base controls the larger collector's current. I have marked the important components for us. Inside of your toy car remote controller

Inside the car (we don't need to do anything here I have just dispatched it).

Creating the program that writes the values to the parallel port.

Building the intermediate circuit that connects the PC interface to the car remote controller.

Isn't it cool? I haven't used any complicated circuit diagrams etc! The idea is really simple the only base theory used is, 'a transistor can act as a switch'. The goal is to control my remote controlled car using my computer's keyboard. This is something I have been working with for some time.

Transistor keyboard or controller