The vending machine which provides the beverage like snacks, cold drink, it is also used for ticketing. These systems are operated on either coin or note or manually switch operated. This paper presents the system which operates not on coin or note,
In this document the VHDL code is given to print our name on the LCD screen of FPGA.
In this document the VHDL code is given to print our name on the LCD screen of FPGA.Description complète
Chattel, Rental, etc
Condom Vending MachineDescription complète
Full description
digital signal processing and fpgaDescripción completa
Full description
Full description
Descripción completa
VHDL code for 4-bit ALU
8:1 Multiplexer The multiplexer is a combinational circuit which accepts several data inputs and allows only one of them at a time to get through to the output.Descripción completa
--using textio.all Entity Soda_Machine is port( --would need maximum of 30 nickles NICKEL_IN : std_logic_vector(4 downto 0); --would need maximum of 15 dimes DIME_IN : std_logic_vector(3 downto 0); --would need maxium of 6 quarters QUARTER_IN: std_logic_vector(2 downto 0); SELECTION: std_logic_vector(15 downto 0); PRICE: out std_logic_vector(15 downto 0); RESET: BOOLEAN; CLK: BIT; --return change and soda NICKEL_OUT, DIME_OUT, DISPENSE: out BOOLEAN ); End Soda_Machine; architecture BEHAVIOR of Soda_Machine is signal Current_Coin_Count, Next_Coin_Count: INTEGER range 0 to 30; -- 30 nickles is $1.50 signal Current_Return_Change, Next_Return_Change : BOOLEAN; begin process(NICKEL_IN, DIME_IN, QUARTER_IN, RESET, CLK, Current_Coin_Count, Current_Return_Change) --maximum amount of coins --possible is 30 niickles variable Temp_Coin_Count: INTEGER range 0 to 30; begin -- Set all Change Returned to 0 NICKEL_OUT <= FALSE; DIME_OUT <= FALSE; DISPENSE <= FALSE; Next_Coin_Count <= 0; NEXT_Return_Change <= FALSE; -- Synchronous reset if (not RESET) then Temp_Coin_Count := Current_Coin_Count; Case SELECTION is when "000" => PRICE := "110010"; End Case; -- Check whether change was put in the Machine if (NICKEL_IN) then Temp_Coin_Count := Temp_Coin_Count + 1; --counting number of nickles inputed elsif(DIME_IN) then Temp_Coin_Count := Temp_Coin_Count + 2; --counting number of dimes inputed elsif(QUARTER_IN) then Temp_Coin_Count := Temp_Coin_Count + 5; --counting number of quarters inputed end if; -- Keeps track if enough change was put in machine
--Macine Requires 25 Nickles if(Temp_Coin_Count >= 25) then Temp_Coin_Count := Temp_Coin_Count - 25; --soda given to customer DISPENSE <= TRUE; end if; --If too many nickles change is returned if(Temp_Coin_Count >= 1 or Current_Return_Change) then if(Temp_Coin_Count >= 2) then --dime returned DIME_OUT <= TRUE; Temp_Coin_Count := Temp_Coin_Count - 2; --stil return more change Next_Return_Change <= TRUE; end if; if(Temp_Coin_Count = 1) then --nickle returned NICKEL_OUT <= TRUE; Temp_Coin_Count := Temp_Coin_Count - 1; end if; end if; Next_Coin_Count <= Temp_Coin_Count; end if; end process; process begin --returns change on positive clock edege wait until CLK' event and CLK = '1'; Current_Return_Change <= NEXT_Return_Change; Current_Coin_Count <= Next_Coin_Count; end process; end BEHAVIOR;
