Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog Understanding Analog Design The Random Number Generator Digital Electronics © 2014 Project Lead The Way, Inc. Project Lead The Way, Inc. Copyright 2009

Random Number Generator Analog Design - Demo Board Game Counter - Analog Random Number Generator Analog Design - Demo Digital Electronics TM 1.2 Introduction to Analog This presentation will Review the Random Number Generator block diagram. Review the circuit design of the analog section of the Random Number Generator. 2 Project Lead The Way, Inc. Copyright 2009

Random Number Generator Block Diagram Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog Analog Section Sequential Logic Section 1 2 3 4 5 6 Combinational Logic Section L1 L2 L3 L4 L5 L6 L7 A B C CLOCK The Analog Section produces a dampened square wave that “rolls” the count and slowly stops. On every pulse of the clock, the Sequential Logic Section increments a binary count from 1 to 6, then repeats. The Combinational Logic Section encodes the binary count into the die’s seven dots. Project Lead The Way, Inc. Copyright 2009

Random Number Generator Block Diagram Board Game Counter - Analog Random Number Generator Block Diagram Digital Electronics TM 1.2 Introduction to Analog Combinational Logic Section The Analog Section produces a dampened square wave that “rolls” the count and slowly stops. On every pulse of the clock, the Sequential Logic Section increments a binary count from 1 to 6, then repeats. The Combinational Logic Section encodes the binary count into the die’s seven dots. L1 L2 L3 L4 L5 L6 L7 Sequential A B C Analog Section CLOCK Project Lead The Way, Inc. Copyright 2009

Random Number Generator Analog Section Board Game Counter - Analog Random Number Generator Analog Section Digital Electronics TM 1.2 Introduction to Analog Schematic Diagram CLOCK Project Lead The Way, Inc. Copyright 2009

Board Game Counter - Analog A Simplified Version Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog When the push button switch is pressed, the 100uf capacitor (C1) will quickly charge to 5 volts through the 1.2 k resistor (R8). As long as the push button switch remains pressed, top end of the 10 k resistor (R9) will be held at 5volts. This results in a simplified version that is equivalent to a standard 555 time oscillator. Actual Version Simplified Version Project Lead The Way, Inc. Copyright 2009

Analysis of Simplified Version Board Game Counter - Analog Analysis of Simplified Version Digital Electronics TM 1.2 Introduction to Analog Period: A RA RB Frequency: C Project Lead The Way, Inc. Copyright 2009

Simulation of Simplified Version Board Game Counter - Analog Simulation of Simplified Version Digital Electronics TM 1.2 Introduction to Analog VOUT VC Project Lead The Way, Inc. Copyright 2009

Simplified Version – Timing Analysis Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog Period: VOUT VC Frequency: Project Lead The Way, Inc. Copyright 2009

Board Game Counter - Analog The Actual Version Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog When the push button switch is pressed and held, the actual analog section of the Board Game Counter performs like a standard 555 time oscillator. However, for the Board Game Counter to operate correctly, the oscillation must slow and eventually stop. This is where the 100uF capacitor (C1) and the 1.2 k resistor (R8) play a role. Actual Version Simplified Version Project Lead The Way, Inc. Copyright 2009

Simulation of Actual Version Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog Push Button Pressed Push Button Released VOUT VC VLimit Project Lead The Way, Inc. Copyright 2009

Actual Version – Timing Analysis Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog When the push button is pressed, the 555 Timer produces a 66 Hz square wave. Once the push button is released, the frequency gradually decreases (period increases). Eventually the oscillation will stop. Push Button Pressed Push Button Released VOUT VC VLimit A B C Project Lead The Way, Inc. Copyright 2009

Timing Analysis at Time A Board Game Counter - Analog Timing Analysis at Time A Digital Electronics TM 1.2 Introduction to Analog Period: Frequency: A Project Lead The Way, Inc. Copyright 2009

Timing Analysis at Time B Board Game Counter - Analog Timing Analysis at Time B Digital Electronics TM 1.2 Introduction to Analog Period: Frequency: B Project Lead The Way, Inc. Copyright 2008

Timing Analysis at Time C Board Game Counter - Analog Timing Analysis at Time C Digital Electronics TM 1.2 Introduction to Analog Period: Frequency: C Project Lead The Way, Inc. Copyright 2009

Random Number Generator Analog Section Board Game Counter - Analog Digital Electronics TM 1.2 Introduction to Analog Analog Section Sequential Logic Section Combinational Logic Section Discussed in a future lesson Project Lead The Way, Inc. Copyright 2009