Abstract
A very interesting and useful complement to classical cash-registers is presented in this paper, coming up with a real-time auto-counting solution for the money inside a cash drawer. The system allows knowing not only the total amount of money but also how many coins and banknotes there are of each value. The embedded solution developed has been intended to become a low-cost solution, allowing better control over the money and helping both owners and workers in the establishments. By using this system, new utilities including automatic final balancing, instant error handling when making operations, and the lack of certain types of banknotes or coins inside the drawer or the excess of some in a certain compartment, could be implemented. Coins-counting solution is based on their weight, and small individual scales made by load cells have been integrated in each coin compartment. With respect to the banknotes, an innovative alternative based on the electrical properties of capacitors is presented. Additionally, considering the relevance of interoperability in today’s systems, a Bluetooth module has been integrated into the system, allowing for data to be accessed remotely from any smartphone, tablet or computer within the range of the module. In this work, an Android application to both control and interact with the system has also been designed.
Highlights
The invention of the cash register, dated around the end of the 19th century, responded to the need for quicker and more accurate ways of providing summaries of daily transactions at points of sale [1]
This paper aims to present the development of a prototype for a new product capable of counting the exact amount of money inside the cash drawer in real-time, combining features of both cash registers and currency-counting machines
The prototype proposed in this paper aims to prove the feasibility of a manageable and low-cost solution, which would increase its scope of application
Summary
The invention of the cash register, dated around the end of the 19th century, responded to the need for quicker and more accurate ways of providing summaries of daily transactions at points of sale [1]. There are not, so many works related to counting the money once it is inside the drawers of such cash register machines This is important in terms of accounting (so as to know the amount of money available in the cash machines at any given time), and in order to guarantee that shortages in cash registers are avoided. This paper aims to present the development of a prototype for a new product capable of counting the exact amount of money inside the cash drawer in real-time, combining features of both cash registers and currency-counting machines. Validation of the performance of the capacitive sensor developed by means of tests that confirm the accuracy and repeatability of the measurement
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