KNOWLEDGES
HARDWARE
Polycarbonate sheet
All the different layers from SmartCash machine will be done using laser cut polycarbonate. Thickness 2 mm.
PLA filament
Some particular pieces harder to manufacture will be 3D printed using PLA plastic filament.
PVC tube
The storage for the coins will be some 32 mm diameter and 1,8 mm thick clear PVC tube.
Threaded rod
Overall the structure will be held with some M6 galvanised steel threaded rod.
Tube profile
The before mentioned threaded rod will have an aluminium tube profile on the outside as spacers in between the layers. Diameter 8 mm.
ELECTRONICS
Arduino Mega
The brains of our machine will be the Arduino Mega, with enough capacity to process all the input data.
LCD screen
This component will let us communicate with the user by telling him what to do next.
Keypad
In order for the user to "talk back" to the machine. It is 4x4 buttton option.
IR sensors
This little sensors will do the job of counting new coins getting storaged.
Motor drivers
To be able to communicate to the motors through the Arduino, we use two different motor drviers the A4988 (Stepper) and MaX14870 (DC).
MOTORS
NEMA 17 Stepper Motor
The stepper motor will hold the servo with the rack and pinion system and make them turn. It is needed precision.
HS-485HB Servo Motor
This servo is in charge of pushing the rack to make the coin fall. It is required to beat the elastic rubber force.
99:1 DC Gearmotor
The last and fundamental motor, the DC will provide the speed and force to turn the coin selector and entry layers.