Reverse Vending Machine

Projects General Guidance
1

Greetings to whoever is reading this.. Im trying to help my sister do her project (RVM) but Ive never really touched coding before in my life up until 3 days ago. With the amount of research ive done ive figured out how to do this project but not as a whole more like individually. you see the arduino uno im using doesnt have enough pins so I resulted to using a breadboard but I have nooo clue what goes where.. please help out..

materials im using :

  • proximity sensor ( to detect the bottle )
  • hx711 load cell sensor and amplifier ( to detect the weight of the bottle )
  • servo motors ( to open the hatch for the bottle and coin dispenser )
  • 830 point breadboard
  • arduino uno
  • jumper wires (m2m m2f f2f)
  • lcd 2x16
  • buzzers
  • lcd
  • buttons

I also do hope you wont judge me rudely for not being able to do this on our own. Just to let you know my sister is 11 so she wont exactly be much of help.

2

Whose project is this?

Does the LCD (written twice) have FOUR pins or SIXTEEN pins?

That is the best way to start! You are half-way to earning your sister a very good grade for not knowing how to program.

You have individual SIX sketches to write...

  1. Proximity Sensor (5vdc)
  2. Servo motor(s) (4vdc to 6vdc)
  3. HX711 load sensor with amp (5vdc)
  4. LCD (5vdc)
  5. Buzzer(s) (Arduino will supply the power)
  6. Button(s) (Arduino will supply the power)

You need to know the VOLTS each of these use to operate. I have written some down, above.

You need a POWER SUPPLY like a laptop computer power supply with 5vdc. A "USB phone charger" might not supply enough current (amperes or amps or A). If the USB phone charger is 2.4A, the phone charger will work.

Now... search the internet (or whatever you use for information) on "arduino proximity sensor" and usually the first link is "good enough" to connect, power, and code a working project. Do this for each device.

When you have all six projects complete, or if you get stuck... return here for questions and answers.

"to whomever" when the person is the object of the prepositional phrase.

1 Like
3

Worth mentioning that a breadboard is good for prototyping but not for any reliable medium-to-long-term use.

1 Like
4

genuinely tysm

5

Et tu, Brute?

6

The post was flagged for moderator review as possible spam by the forum AI and as such was hidden

It has been reviewed and restored

1 Like
7

Its perhaps worth mentioning that once you get around to avtual coding, that inside the Arduino IDE, under Tools -> Examples, you can find a number of code examples for various Arduino features. Each board package or device library that you install will add further related examples to the list relating to that item. Its a useful resource.

8

Use Arduino 5V → breadboard red rail, GND → blue rail.
Power servos from that rail, not directly from Arduino 5V.

Pin setup:

  • Proximity sensor (HC-SR04): Trig to D8, Echo to D9.
  • HX711: DT to D4, SCK to D5.
  • Servo hatch to D6.
  • Coin-servo to D7.
  • Button to D2 (use internal pull-up).
  • Buzzer to D3.
  • LCD with I2C: SDA to A4, SCL to A5.
    Also, check this example for similar coin-dispensing machine for guidance: Coin Register IOT for Vending Machine - Share Project - Justway
9

What is the difference? A breadboard is not a power supply.

Again?

Power Servos with external power supplies. See Post #2.