Design task – Logic gates

Specification:

In this design task you need to create a circuit implementing two logic gates, using transistors, as per the diagram below.

You are required to implement the above system where the LED turns ON when the output of the logic circuit is true/1. 

Inputs of the circuit are considered true/1 as outlined below. 

• LDR input is true/1 when it receives light of intensity above a certain threshold (you can set this threshold).  Otherwise, it's considered false/0.
• Push button input is true/1 when it is pressed, otherwise false/0.
• Slide switch input is true/1 when moved to the right, otherwise false/0.

Permitted Components:

• 1 x Mechanical slide switch
• 1 x Pushbutton switch
• 1 x LED
• 1 x LDR
• Transistors as needed
• Resistors as needed

Tasks:

1.  Draw the circuit diagram (using draw.io) showing all the electrical components.
2.  Present your calculations (you will be asked to explain how you did the calculations).
3.  Build the working circuit on a breadboard and bring it to the assessment (with the circuit diagram and the calculations). 
4.  Display the output waveform (from the LED) on one channel of the DSO and the input waveform from the LDR on the second channel of the DSO.