Team SS J8 roster: Jia Juan Koo, Matt doo, Joon Lee Thong, Thaddeus Kee

Published February 20, 2024

Sustainable Vending Machines

Making vending machines more energy efficient and sustainable.

BeginnerFull instructions provided530

Things used in this project

Hardware components

M5Stack Mini RFID Unit RC522 Module Sensor

only cashless payment

M5Stack ENV II Unit with Temperature Humidity Pressure Sensor(SHT30+BMP280)

ensure the temperature of the machine stays optimal for chilled drinks

SG90 Micro-servo motor

turns the spiral thing in the machine to dispense the product

M5Stack Light Unit with Photo-resistance

in the day, the vending machine lights will be dimmer

M5Stack PIR Sensor Human Body Infrared PIR Motion Sensor (AS312)

checks if people are at/using the machine. If no one is there, lights of the vending machine will dim, saving energy.

M5Stack I2C Hub 1 to 6 Expansion TCA9548A Module

Software apps and online services

M5stack Uiflow

Story

Vending machines are very convenient and have been increasingly popular in recent years. However, they may not be used at most times of the day while still consuming high amounts of energy. This project aims to develop a smart and scalable solution that reduces the energy used with sustainable technology.

Objectives:

To develop and apply sustainable methods in vending machines that will help reduce energy consumption.
To make vending machines self-sustainable with lesser human intervention required to maintain them.

Existing product problems (vending machines) :

1) Runs 24/7, high energy consumption (key problem)2) Slot to accept hard cash as payment; easy to hack and break

Features to tackle problems:

Uses PIR sensor to detect the presence of consumers, auto turn on/off; conserve energy (solves problem 1)
Solar panels installed on vending machines located outdoors, a sustainable source of energy, decreases energy consumption from power sources (solves problem 1)
Light sensor to detect the presence of light outside, adjust brightness level in the vending machine, reducing energy consumption (solves problem 1)
Uses RFID scanner to accept payment, no cash accepted; (solves problem 2)

Additional features:

Button inputs logs item stock, data can be used to analyse which items are favourites, how fast they sell out depending on where each vending machine is located, optimising product sales
PIR sensor detects people walking by (crowd), logs data; used for analysis of crowd at different vending machine locations

Common features (already in existing products)

Buttons to input product selection & quantity

Servo motor to push product out of vending machine

Servo motor to push product out of vending machine

ENV sensor to detect and maintain temperature for temp-sensitive products e.g. chilled drinks

ENV sensor to detect and maintain temperature for temp-sensitive products e.g. chilled drinks

Video presentation

Front view (what users will see)

Side view (cable management)

Top view (inside of the vending machine)

flowchart (1)

flowchart (2)

flowchart (3)

flowchart (4)

from m5stack import *
from m5ui import *
from uiflow import *
import espnow
import wifiCfg
import time
import unit

setScreenColor(0x222222)
servo_0 = unit.get(unit.SERVO, unit.PORTA)
pir_0 = unit.get(unit.PIR, unit.PORTB)


mac = None
Data_send = None
quantity = None
price = None

wifiCfg.wlan_ap.active(True)
wifiCfg.wlan_sta.active(True)
espnow.init()

title0 = M5Title(title="vending_ui", x=3, fgcolor=0xFFFFFF, bgcolor=0x0000FF)
label0 = M5TextBox(190, 33, "Item", lcd.FONT_DejaVu24, 0xFFFFFF, rotate=0)
label1 = M5TextBox(145, 78, "Quantity:", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
quantity_lbl = M5TextBox(253, 78, "Text", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
label2 = M5TextBox(134, 198, "+", lcd.FONT_DejaVu40, 0xFFFFFF, rotate=0)
label3 = M5TextBox(58, 198, "-", lcd.FONT_DejaVu40, 0xFFFFFF, rotate=0)
label4 = M5TextBox(207, 208, "Checkout", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
label5 = M5TextBox(146, 109, "Price:", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
price_lbl = M5TextBox(252, 109, "Text", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
mac_lbl = M5TextBox(1, 20, "Text", lcd.FONT_Default, 0xFFFFFF, rotate=0)
image0 = M5Img(16, 52, "res/default.jpg", True)

from numbers import Number




def recv_cb(_):
  global mac,Data_send,quantity,price
  mac, _, Data_send = espnow.recv_data(encoder='str')
  lcd.setBrightness(100)
  servo_0.write_angle(0)
  wait(1)
  servo_0.write_angle(90)

  pass
espnow.recv_cb(recv_cb)


def buttonA_wasPressed():
  global mac, Data_send, quantity, price
  quantity = (quantity if isinstance(quantity, Number) else 0) + -1
  price = 2.5 * quantity
  pass
btnA.wasPressed(buttonA_wasPressed)

def buttonB_wasPressed():
  global mac, Data_send, quantity, price
  quantity = (quantity if isinstance(quantity, Number) else 0) + 1
  price = 2.5 * quantity
  pass
btnB.wasPressed(buttonB_wasPressed)

def buttonC_wasPressed():
  global mac, Data_send, quantity, price
  espnow.add_peer('98:f4:ab:6b:a1:71', id=1, channel=0, ifidx=0, encrypt=False)
  espnow.send(id=1, data=str(price))
  quantity = 1
  price = 2.5
  pass
btnC.wasPressed(buttonC_wasPressed)


mac_lbl.setText(str(espnow.get_mac_addr()))
quantity = 1
price = 2.5
while True:
  if (pir_0.state) == 0:
    lcd.setBrightness(1)
  else:
    lcd.setBrightness(100)
  quantity_lbl.setText(str(quantity))
  price_lbl.setText(str(price))
  wait_ms(2)

from m5stack import *
from m5ui import *
from uiflow import *
import espnow
import wifiCfg
from flow import ezdata
import unit


setScreenColor(0x222222)
rfid0 = unit.get(unit.RFID, unit.PAHUB0)
light0 = unit.get(unit.LIGHT, unit.PORTB)
env21 = unit.get(unit.ENV2, unit.PAHUB1)


mac = None
Data_send = None
stock = None
transactions = None
sold = None
quantity = None

wifiCfg.wlan_ap.active(True)
wifiCfg.wlan_sta.active(True)
espnow.init()
wifiCfg.autoConnect(lcdShow=False)

price = M5TextBox(179, 109, "Text", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
title0 = M5Title(title="paymentSystem", x=3, fgcolor=0xFFFFFF, bgcolor=0xff0047)
label3 = M5TextBox(66, 109, "Total Price:", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
stock_lbl = M5TextBox(117, 27, "stock_lbl", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label5 = M5TextBox(0, 77, "Transactions:", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
sales_lbl = M5TextBox(142, 82, "sales_lbl", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label1 = M5TextBox(0, 22, "Stock left:", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
label6 = M5TextBox(9, 112, "Internal Temp:", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label7 = M5TextBox(52, 134, "Lighting:", lcd.FONT_Default, 0xFFFFFF, rotate=0)
lighting = M5TextBox(115, 134, "lighting", lcd.FONT_Default, 0xFFFFFF, rotate=0)
temp = M5TextBox(267, 112, "temp", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label8 = M5TextBox(0, 49, "Stock sold:", lcd.FONT_DejaVu18, 0xFFFFFF, rotate=0)
sold_lbl = M5TextBox(124, 54, "sold_lbl", lcd.FONT_Default, 0xFFFFFF, rotate=0)
scan = M5TextBox(41, 160, "Please scan to pay", lcd.FONT_DejaVu24, 0xFFFFFF, rotate=0)
label2 = M5TextBox(41, 214, "Back", lcd.FONT_Default, 0xFFFFFF, rotate=0)

from numbers import Number


# Describe this function...
def stats_hide():
  global mac, Data_send, stock, transactions, sold, quantity
  label1.hide()
  label5.hide()
  sold_lbl.setPosition(x=999)
  stock_lbl.setPosition(x=999)
  sales_lbl.setPosition(x=999)
  label2.setPosition(x=999)
  label6.setPosition(x=999)
  label7.hide()
  label8.hide()
  lighting.setPosition(x=999)
  temp.setPosition(x=999)

# Describe this function...
def stats_show():
  global mac, Data_send, stock, transactions, sold, quantity
  label1.show()
  label5.show()
  stock_lbl.setText(str(stock))
  sales_lbl.setText(str(transactions))
  sold_lbl.setText(str(sold))
  sold_lbl.setPosition(x=120)
  sales_lbl.setPosition(x=142)
  stock_lbl.setPosition(x=120)
  label2.setPosition(x=41)
  label6.setPosition(x=10)
  label7.show()
  label8.show()
  lighting.setPosition(x=115)
  temp.setPosition(x=115)
  lcd.setBrightness(100)
  while not (btnA.isPressed()):
    lighting.setText(str(light0.analogValue))
    temp.setText(str(env21.temperature))

# Describe this function...
def payment_hide():
  global mac, Data_send, stock, transactions, sold, quantity
  label3.hide()
  scan.hide()
  price.hide()
  label2.setPosition(x=999)
  lcd.setBrightness(0)

# Describe this function...
def payment_show():
  global mac, Data_send, stock, transactions, sold, quantity
  label3.show()
  scan.show()
  price.show()
  label2.setPosition(x=41)
  lcd.setBrightness(100)



def recv_cb(_):
  global mac,Data_send,stock,transactions,sold,quantity
  mac, _, Data_send = espnow.recv_data(encoder='str')
  payment_show()
  scan.setText('Please scan to pay')
  price.setText(str(Data_send))
  while not (btnA.isPressed()):
    if rfid0.isCardOn():
      espnow.add_peer('98:f4:ab:6b:a3:85', id=2)
      espnow.send(id=2, data=str('test'))
      scan.setText('Payment successful!')
      speaker.tone(800, 200)
      transactions = (transactions if isinstance(transactions, Number) else 0) + 1
      ezdata.setData('m4kkE3iXSzN01jLI6QN0D9bytn23prU5', 'transactions', transactions)
      quantity = float((float(Data_send) / 2.5))
      stock = (stock if isinstance(stock, Number) else 0) + int((quantity * -1))
      sold = (sold if isinstance(sold, Number) else 0) + int(quantity)
      ezdata.setData('m4kkE3iXSzN01jLI6QN0D9bytn23prU5', 'stock_sold', sold)
      break
  payment_hide()

  pass
espnow.recv_cb(recv_cb)


def buttonB_wasPressed():
  global mac, Data_send, stock, transactions, sold, quantity
  payment_hide()
  stats_show()
  pass
btnB.wasPressed(buttonB_wasPressed)

def buttonA_wasPressed():
  global mac, Data_send, stock, transactions, sold, quantity
  payment_hide()
  stats_hide()
  pass
btnA.wasPressed(buttonA_wasPressed)


lcd.setBrightness(100)
stock = 10
transactions = int((ezdata.getData('m4kkE3iXSzN01jLI6QN0D9bytn23prU5', 'transactions')))
sold = int((ezdata.getData('m4kkE3iXSzN01jLI6QN0D9bytn23prU5', 'stock_sold')))
payment_hide()
stats_hide()
quantity = 0

Sustainable Vending Machines

Things used in this project

Hardware components

Software apps and online services

Story

Code

m5stack_1

m5stack_2

Credits

Jia Juan Koo

Matt doo

Joon Lee Thong

Thaddeus Kee

Comments

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Sustainable Vending Machines

Sustainable Vending Machines

Things used in this project

Hardware components

Software apps and online services

Story

Code

m5stack_1

m5stack_2

Credits

Jia Juan Koo

Matt doo

Joon Lee Thong

Thaddeus Kee

Comments

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