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Objective Design a gumball machine control logic, including the finite state machine and circuit design. Problem Statement The gumball machine delivers a piece of gum after receiving 15¢ in coins. The machine has a single coin slot that accepts nickels and dimes, one coin at a time. A mechanical sensor indicates to the control whether a dime or a nickel has been inserted into the coin slot. The input N is asserted when a nickel is inserted into the coin slot. D is asserted when a dime is deposited. The machine asserts OPEN for one clock period when 15¢ or more has been deposited since the last reset. Then the controller's output causes a single piece of gum to be released down a chute to the customer. The machine does not give change. A customer who pays with two dimes get a piece of gum, but overpays 5¢. Coin Gum Gum release sensor dispenser mechanism FSM Reset CLK • Nis asserted for 1 clock period when a nickel is inserted into the coin slot. • Dis asserted for 1 clock period when a dime is inserted into the coin slot. • Machine asserts Open for one clock period when 15¢ (or more) has been deposited since the last reset. This does not completely define the behavior of the FSM. For example, what happens if a penny is inserted into the coin slot, or what happens after the gum is delivered to the customer? Let's assume that: • Coin sensor returns coins it does not recognize. • External logic resets the machine after the gum is delivered.

Objective Design a gumball machine control logic, including the finite state machine and circuit design. Problem Statement The gumball machine delivers a piece of gum after receiving 15¢ in coins. The machine has a single coin slot that accepts nickels and dimes, one coin at a time. A mechanical sensor indicates to the control whether a dime or a nickel has been inserted into the coin slot. The input N is asserted when a nickel is inserted into the coin slot. D is asserted when a dime is deposited. The machine asserts OPEN for one clock period when 15¢ or more has been deposited since the last reset. Then the controller's output causes a single piece of gum to be released down a chute to the customer. The machine does not give change. A customer who pays with two dimes get a piece of gum, but overpays 5¢. Coin Gum Gum release sensor dispenser mechanism FSM Reset CLK • Nis asserted for 1 clock period when a nickel is inserted into the coin slot. • Dis asserted for 1 clock period when a dime is inserted into the coin slot. • Machine asserts Open for one clock period when 15¢ (or more) has been deposited since the last reset. This does not completely define the behavior of the FSM. For example, what happens if a penny is inserted into the coin slot, or what happens after the gum is delivered to the customer? Let's assume that: • Coin sensor returns coins it does not recognize. • External logic resets the machine after the gum is delivered.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Objective Design a gumball machine control logic, including the finite state machine and circuit design. Problem Statement The gumball machine delivers a piece of gum after receiving 15¢ in coins. The machine has a single coin slot that accepts nickels and dimes, one coin at a time. A mechanical sensor indicates to the control whether a dime or a nickel has been inserted into the coin slot. The input N is asserted when a nickel is inserted into the coin slot. Dis asserted when a dime is deposited. The machine asserts OPEN for one clock period when 15¢ or more has been deposited since the last reset. Then the controller's output causes a single piece of gum to be released down a chute to the customer. The machine does not give change. A customer who pays with two dimes get a piece of gum, but overpays 5¢. Coin N Gum Gum release sensor dispenser mechanism FSM Reset CLK • Nis asserted for 1 clock period when a nickel is inserted into the coin slot. • Dis asserted for 1 clock period when a dime is inserted into the coin slot. • Machine asserts Open for one clock period when 15¢ (or more) has been deposited since the last reset. This does not completely define the behavior of the FSM. For example, what happens if a penny is inserted into the coin slot, or what happens after the gum is delivered to the customer? Let's assume that: Coin sensor returns coins it does not recognize. • External logic resets the machine after the gum is delivered.
Transcribed Image Text:Objective Design a gumball machine control logic, including the finite state machine and circuit design. Problem Statement The gumball machine delivers a piece of gum after receiving 15¢ in coins. The machine has a single coin slot that accepts nickels and dimes, one coin at a time. A mechanical sensor indicates to the control whether a dime or a nickel has been inserted into the coin slot. The input N is asserted when a nickel is inserted into the coin slot. Dis asserted when a dime is deposited. The machine asserts OPEN for one clock period when 15¢ or more has been deposited since the last reset. Then the controller's output causes a single piece of gum to be released down a chute to the customer. The machine does not give change. A customer who pays with two dimes get a piece of gum, but overpays 5¢. Coin N Gum Gum release sensor dispenser mechanism FSM Reset CLK • Nis asserted for 1 clock period when a nickel is inserted into the coin slot. • Dis asserted for 1 clock period when a dime is inserted into the coin slot. • Machine asserts Open for one clock period when 15¢ (or more) has been deposited since the last reset. This does not completely define the behavior of the FSM. For example, what happens if a penny is inserted into the coin slot, or what happens after the gum is delivered to the customer? Let's assume that: Coin sensor returns coins it does not recognize. • External logic resets the machine after the gum is delivered.
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