This document describes a smart trolley system with automated billing being developed by students at Mbeya University of Science and Technology. Data was collected through observation and interviews on the existing manual billing system. This showed billing time increased with more customers and items. The proposed system will use RFID tags on items and a reader on the trolley to automatically scan items and display the running total. Circuit diagrams and specifications are provided for components like the display unit, RFID module, microcontroller, and power supply that will be used. Flow charts and simulation results demonstrate how adding or removing items updates the displayed total price in real time.

1. MBEYA UNIVERSITY OF SCIENCE AND
TECHNOLOGY
COLLAGE OF ENGINNERING AND TECHNOLOGY (CET)
DEPARTMENT OF ELECTRICAL AND POWER ENGINNERING
COURSE OF ELECTRICALAND ELECRONICS ENGINNERING
TITLE : SMART TROLLEY WITH AUTOMATED BILLING SYSTEM
HOSTS : VENANCE F MASSAWE
: HASSAN H MPYA
SUPERVISOR : MR. ROMANUS LYANDA
DATE : 25 APRIL 2023
ACADEMIC YEAR 20222023

2. DATA COLLECTION
Methods used to collect data included observation and
in some cases interview were used.
Primary data as the data collected from first hand
source by methods like surveys, interviews and
experiments.

3. DATA COLLECTION
In the data collected, it shows that the more the customers and the items
purchased per customer, the more the time consumed at the billing
section.
By using barcode system for scanning the items. Each item is required to
be scanned so as the price and total bill to display at the screen monitor.
The collected data of existing system help to know the components to be
used in different parts of the proposed system.

4. DATAANALYSIS
Different design parameters were obtained based on the analysis of a number of
data as discussed on the previous chapter.
Display unit
 Character per line Minimum: 16 characters minimum 24 characters
 Number of lines: 2 to 4 lines
 Input: At least 2.5V (dc)
RFID Module [RC522]
 13.56MHz RFID module
 Operating voltage: 2.5V to 3.3V
 Maximum Data Rate: 10Mbps
 Read Range: 5cm
 Current Consumption: 13-26mA
 Power down mode consumption: 10uA (min)

5. DATAANALYSIS
ESP8266 NodeMCU
The NodeMCU ESP8266 development board comes with the ESP-12E
module containing ESP8266 chip having Tensilica Xtensa 32-bit LX106
RISC microprocessor.
 Operating Voltage: 3.3V
 Input Voltage: 7-12V
 Digital I/O Pins (DIO): 16
 Analog Input Pins (ADC): 1
Buzzer
It used in this project to set alarm sound when an obstacle is detected in
sensor receive signal from microcontroller and convert electrical energy
into sound energy.

6. DATAANALYSIS
Power Supply
All of the components in the proposed system uses DC voltage. To
convert 240V/50Hz AC to +5V/0Hz and 3.3V/0Hz DC. Power supply
unit will consists of, step down transformer, bridge rectifier, filter circuit
and voltage regulators.

7. FLOW CHART

8. SIMULATION RESULT
 When the item is added to the trolley;

9. SIMULATION RESULT

10. SIMULATION RESULT
 Displaying the total price

11. SIMULATION RESULT
 When the item is removed from the trolley;

12. SIMULATION RESULT
 Total price after removing the item

13. SIMULATION RESULT
v. Finish shopping