Photodiode circuit for this project is quite simple and easy to implement since I'm using SFH551/1-1V. According to the data sheet the SFH511 is a silicon based and directly connected to a transimpedance amplifier that works as a pre amplifier. And also a differential amplifier is connected in series and works as a post amplifier. Then its output is passed to the internal Schmitt- trigger that drives bipolar NPN transistor. So the data out signal is from the collector of the bipolar transistor. Since SFH551 is a transimpedance amplifier with TTL open collector output stage and therefore a pull up resistor of 330ohm is used as shown in figure. And the capacitor is to reduce interference and it is recommended that it must place close to SFH551.
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