1. Welcome to the Real World

2. What to do ? Input from the mangonel sensors Input expected by the software

3. How to do ? Input arrives from sensors Logic circuit combines and inverts inputs to create a single pulse PICAXE measures the pulse duration and outputs the value to seven segment displays

4. NAND gate Input A Input B Output

5. Basic Logic functions (gates): AND OR NOT

6. JK Flip-flop

7. Pulse width meter circuit diagram

8. Model on a breadboard (find TTL or “Transistor–transistor logic” in wikipedia )

9. Work for today No connection DOT means wire connection

10. Identifying a microchip 1 9 10 18

11. Tips and tricks: Be tidy: Keep the wires short. This improves reliability. Wire Colours does not affect the performance a circuit, but does affect the performance of a person trying to understand it. Connected wires are marked with a dot. Remember about the power supply. –Do not forget to connect –Do not forget to switch OFF when making changes.