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Online trading has become an important component of the portfolio of investors as it provides an attractive and profitable investment option in spite of the risk involved. Many individuals embraced diversified financial portfolios and started investing in Stocks, Cryptocurrencies, Bonds, Metals and Commodities through online portals. It needs constant attention to the price of the financial commodities for obtaining profits. However, majority of the investors are landing in losses because of lack of such continual monitoring of the prices to ascertain the changes in the prices of financial commodities all the time. In this work, to assist user in order to avoid this tiresome task of continual monitoring, a prototype of a low cost portable device for change indication in price of multiple financial commodities of various trading paradigms based on NodeMCU is proposed. The device includes Data retrieval and processing (DRP) unit in the form of nodeMCU, control unit, and notification unit. The DRP unit initially obtains the list of the financial commodities and control parameters including sampling rate, threshold, and time delay from the Google firebase real time database which are collected from user through a mobile application. Further it fetches the real time price data of the financial commodities to compute the percentage change in the given time duration and obtain the prioritized list i.e., the list of financial commodities as per the descending order of absolute percentage change and instruct the notification unit to generate alarm through an audio buzzer incase at least if one of the financial commodity exhibits an absolute percentage change greater than a predefined threshold. The notification unit also contains Red and Green LED corresponding to each of the financial commodity to indicate negative and positive changes that are exceeding the threshold. Further, a LCD displays the details of the first financial quantity in the prioritized list. The control unit comprises of two designated switches to change the financial quantity whose details are to be displayed on LCD and a silent mode switch to disable the audio notifications for the sake of convenience of the user. A prototype of the proposed device is realized with 16 cryptocurrencies, a sampling rate of one sample per minute and a time delay of one hour for the purpose of the testing the device. A maximum of 0.20 % of mean error rate is observed in price of the Doge coin, and 0 % of mean error rate is observed in percentage change of price corresponding to all cryptocurrencies. Further the number of notifications using RED and GREEN LEDs are computed for all cryptocurrencies which are found to be exactly in match with the original data with various threshold values of 1%,2%,5%, and 10%. The total number of notifications including both Red and Green LEDs are found to be higher in HBAR. The proposed device assists investors to take timely decisions for profitable trading and provides valuable insights about the momentum of various markets to readjust the investments and balance the portfolios accordingly.

A NodeMCU based low-cost portable device for change indication in multiple financial commodities of various market paradigms