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Build your own Tele Presence Robot: |
Parallel Port Interface To allow our laptop to control the Roomba remote control, we will need to build a simple parallel port interface.
The figure below illustrates the basic circuit used to control each relay.
The diode is a general purpose switching device, such as the 1N4147. The transistor is also a general purpose NPN device with gain around 100 or more, such as the common 2N2222. The resistor is a 1/4 Watt, 2200 Ohm. Reed relays have excellent reliability and use very little power, reason why I chose Radio Shack's 275-232 (250 Ohm coil, nominal voltage of 5VDC, nominal current of 20mA). The following figure shows the entire circuit:
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References: http://ourworld.compuserve.com/homepages/Bill_Bowden/r_ctrl.htm http://www.lvr.com/jansfaq.htm Software to control LEDs using a parallel port: http://www.codeproject.com/csharp/csppleds.asp
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