Snack Vending Machine powered by Arduino Uno

hello, greetings indonesia.
this snack vending machine final project. project finished in end of 2015.

the aim of project create vending machine, powered arduino microcontroller, using "any cheap , easy get" components available in local store.

goals: the vending machine has accept amount of money (in coin), before let customer choosing product, , of course delivering product.

so, did achieve goals:

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- first think first, concept.
this sketch first idea of might build. gonna snack vending machine.
accepting coin payment, , using acrylic case.

- create solidworks model. , mean completed model. need determine dimensions of product, in case, snack package. size of accepted coins, size of push button, size of rejected coins, size of coin slot, size of coin ramp. step include determine, pick , measure size of arduino microcontroller used. sensor used, placed, dimension , sizes, accepted coins goes to, think sould put monochrome lcd (its not necessary insist). , finally, still in solidworks model creation, dont forget create holes screw, every parts.
the case made acrylic, , cutted using laser cutting method. thats why create model detailed , accurate can.
because more accurate model, more preccission case get.

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- filtering coins, first using coin dimension. designing slot coin, managed determine coins size allowed enter machine. second filter, determine coin size allowed accepted , rolling down coin holder. because using gravity force, if coin sizes (diameter) smaller length of coin ramp/track, falling down , rejected.



on pic above, coin on left wont enter slot coin.
coin on middle fall , rejected.
coin on right accepted coin, goes down coin holder.

this video when doing coin testing, show how method working.
https://www.youtube.com/watch?v=ydrfbdblnp0

- finally, arduino , friends.



i use:
1 arduino uno. (should use arduino mega, more io)
1 sensor shield.
3 infrared (reflective) or line follower sensor, used product detection.
1 proximity (electromagnetic) sensor, used coin sensor number 1.
1 distance interupter (infrared/optocoupler) sensor coin sensor number 2.
1 power supply 6v dc motor.
3 dc motors, 6v, complete wheels, relay dc motor, , stuff, namely lcd (nokia 5110 lcd), led, push button, speaker (silent boring). note: lots of them not on pic

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- testing lcd. of course testing others too. push button, relay, led, try combine , learn different logic , coding.

- 1 of important part on vending machine, delivering mechanism. using spiral mechanism, alluminium wire (2mm wire diameter), manually shaped spiral of 9cm diameter pvc pipe.

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spiral wire tied wheel using cable ties. when dc motor on, wheel rotating, , spiral wire wil rotate. rotating spiral converting rotational linear movement of product.



finished 3 spiral mechanism

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- coin sensor number 1, using proximity sensor, or induction electromagnet sensor.
when accepted coin pass sensor, trigger arduino start counting time (in millisecond).

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and when accepted coin pass coin sensor number 2, distance interupter sensor, arduino stop counting time, , time required particular coin, travel sensor number 1 sensor number 2.

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using magnets, attached alongside coin ramp, can filter between coin did not affected magnetic field, , coin being affected magnetic field. coins affected magnetic field rolling down slower (just 300 500 millisecond slower), again depend on how many magnets attached along side coin ramp. dont use many magnet jam , make coin stop in middle of coin ramp. dont want happen, because need counting time every coin, "travel times" between sensor number 1 , number 2. "travel times" (in millisecond), used arduino determine value of accepted coin.

logic: if "travel times" more or equal xxx millisecond, yyy coin, else zzz.



this video when testing method, filtering coins using magnet.
https://www.youtube.com/watch?v=7rxvzyr_he0

- using 3 infared sensor product detection when fall being pushed/moved spiral mechanism. when product fall, trigger sensor, sending off signal dc motor (via relay).
so when product falls, spiral mechanism stop rotating.



this video show how product detection working in vending machine.
https://www.youtube.com/watch?v=vhj58t4uyeo

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- , lcd show information (in indonesian currency) accepted coin value, how total balance accepted coin, , other general instruction step step operate machine.

- finally, finished snack vending machine. after 3 months, or so, ready final test machine, payment/coin test, product selection, , product delivery.



this snack vending machine final test video, big arduino, , google.
https://www.youtube.com/watch?v=6qpcrwp8l4s
i hope project of you, maybe give inspiration or idea,
about building , creating next arduino powered vending machine.

rooms improvement:
add coin changes mechanism.
accept paper money, bitcoin, digital payment.
show product stock on lcd.
notify via internet/network every time transaction happen.
notify when product stock empty, , etc.

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