Top-level Schematic (1) X1 X2 X3 & & & encoder1： 3-bit input to 8-bit output B[7:0] x1 x2 x3 Q[7:0] Clk1=20MHZ X4 X5 X6 X7 CLK1 clk D[7:0] A1 Q[7:0] R Adder Money [7:0] CLK1 … The circuit also provides the processor with an early warning that the power is about to fail, and allows it time to finish any time critical tasks before the power is removed. Ryan Bates has built a much cheaper DIY Vending Machine using Arduino, and he named it ‘Venduino’.
Another principal object of the present invention is the provision of an improved and more versatile control circuit for vending and other coin or check controlled machines.
It uses a coin acceptor module to accept coin payments. Each driver 26 has an individual latch line directly from the processor 18 to pin 5 thereof to latch only data into a chip 16 that is valid for that particular chip. The serial examination of the data precludes the pushing of two selection switches simultaneously by a customer having an erroneous effect on the operation of the machine. Prices subject to change without notice. 10. 9, and initially checks the serial data from touch panel 12 which has been stepped through shift registers 14 and 20 to determine if a vend selection has been made by a customer. 13. Aug 15, 2016 - Schematic Diagram for Arduino Based Vending Machine.
The interrupts for the processor are first disabled before this incrementing action and then enabled thereafter, in a manner similar to that described with respect to the Selection Switch Subroutine, to prevent a power failure from causing an erroneous entry. The current detecting circuit 32 indicates to the processor the presence of absence of current therethrough, thereby indicating to the processor whether or not the chosen product is out-of-stock. Figure 1: Vending Machine Top-Level Module Diagram. The status of all of the switches is latched into the shift register 20 in the same manner as the signals from the touch panel 14 and is then shifted into the processor 16.
Further, a strobe generator is responsive to actuating signals from the logic circuit for generating strobe signals for the plurality of capacitively coupled switches, with the amplitudes of the strobe signals being adjusted by the common potentiometer.
After the data from touch panel 12 is latched into the shift register 14, the transistor generating the strobe signal is turned off to remove the strobe signal. The capacitor voltage is coupled through a 1M ohm resistor to several buffer gates 41 to buffer the impedance of the signal and convert it to a digital signal which then interrupts the processor by the signal to pin 6 thereof.
This power supply, regulated by voltage regulator 37, also supplies a regulated 12 volts DC to transistor 2N3904. The signal then passes through an R-C delay circuit formed by R8, R9 and C10 to two additional gates 42. The Set Special Subroutine then recalls Subroutine A for the second item in the special, associated with the second digit of the display. The gates 41 function in the manner of Schmidt trigger circuits.
This arrangement eliminates a substantial amount of circuitry and wiring compared to conventional systems. Alternatively, the second and third digits of the credit display might be set to zero in this subroutine, in which case selection switch six becomes in essence an ordinary vend button, causing the dispensing of only one item of product. If adequate change can be made, the processor checks to determine if the selected product is in stock.
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