28th Nov 2012
Week five:
The Vishay bpw24r photodiode is suitable for the 3 sensors required
in this tracking device, this photo sensor will be biased with a voltage and
calibrated to the micro controller, this component has a small aperture of
12 degree’s so it is more directional and will not pick up the incidental light
(noise frequencies) that are undesirable as readily.
Other components like the BJT’s have been chosen so as to allow for enough current to flow to power the movement of the servo’s these are 2N2222, they have a max current of 0.6 amps collector to emitter so these can be limited to the required current of around 0.2 amps.
Other components like the BJT’s have been chosen so as to allow for enough current to flow to power the movement of the servo’s these are 2N2222, they have a max current of 0.6 amps collector to emitter so these can be limited to the required current of around 0.2 amps.
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| Ref. http://www.engineersgarage.com /electronic-components/2n2222-transistor |
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| Ref. http://us.100y.com.tw/ChanPin.asp?MNo=57169 |
Software and Testing:
As the flow diagram is satisfactory for the function of the tracker the writing of the software is to be started using the Arduino UNO R3 and a test circuit is to begin.
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| Ref. http://www.arduino.cc/en/Main/arduinoBoardUno |
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