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With today’s technology, even simple microcontroller-based devices can fetch and display data from the Internet. Learn how these two Cornell students built a system that can track stock prices in real time and display them conveniently on an LCD screen. For the design, they used an Espressif Systems ESP8266 Wi-Fi module controlled by a Microchip PIC32 MCU.

We challenged ourselves to build a system using the PIC32 microcontroller (MCU) from Microchip Technology that could track stock prices in real time and display them. The goal was to create a PIC32 system that connects to the Internet and can work as a server/client to perform several functions and eventually serve as a central home hub. The system can be easily modified to fetch and display any kind of data from the Internet, as long as there is an API for it.

The system works as a TCP server that connects to a Python Client and fetches real-time stock information for any company the user inputs. The input is a 12-digit keypad that works like a cell phone keyboard. The user inputs the stock symbol for a company, and the system displays the stock price on an LCD monitor, along with the corresponding arrows for increase or decrease in price relative to the last fetch. A high-level block diagram for our system design is given in Figure 1. In essence, we first wait for the Python Client to connect to the server. Until this happens, the server remains idle. The user can then input a stock symbol using the keyboard at any time, which triggers an API call. The display is then updated with the price of the stock, and refreshes automatically every 5 seconds.

We made use of Sean Carroll’s Development Board, which contains a TFT LCD, the PIC32 MCU, several peripheral pins and support for a port expander. We connected the ESP8266 transmit and receive pins to RA1 and RB10, respectively, on the PIC, as these pins support UART. We used UART channel 2 for communication with the ESP8266. The LCD communicates with the PIC via SPI channel 1 on pin SCK1.

Main Thread: To make the software design more structured and the software workflow clearer, we developed a “main” protothread. This thread first spawned the ESP Init thread, and then waited for a connection from our client, blocking the rest of the system until this requirement was satisfied. Once it had detected the client had connected, it would then check to see if a stock symbol had been entered. If so, it made an API call which updated the corresponding stock price on the LCD in real time.

Unfortunately, this method did not work for receiving stock price responses, which was the most important function of our project. To implement this task, we created a separate function, called APICall(), which was responsible for sending a custom command to the ESP via serial, based on the stock ticker entered on the keypad. The stock price was returned and displayed with its symbol and a triangle to indicate how the price instantaneously changed on the TFT LCD. To receive stock price responses, we read a preset number of characters from the buffer, instead of relying on a terminator. This was feasible because the response containing the stock price was always the same number of characters. We then parsed this response to get only the stock price, so we could display it and compare it with the last price.

In a similar fashion to our stock quote requests, we could make API calls to servers of the national weather service and display temperature, environmental conditions, and general weather data on our TFT display. We could take this even further by then analyzing the weather data and, based on the conditions, stream music that fit the mood of the weather. Streaming would occur via Wi-Fi communication with the ESP module.

Aside from the incorporation of API calls and data requests to external servers, Wi-Fi communication with the PIC could be used in various other applications. It is extremely versatile, so any sort of light display, temperature control circuit, home security unit, or IoT application could be implemented using the ESP module and serial communication over the PIC.

Our touch displays range from standard options to fully customizable designs. In addition, we love to integrate our LCD displays with the latest technology such as IoT, Bluetooth, wireless, voice control and more.  Moreover, our GUI software design toolcan be used to effortlessly design and implement custom user interfaces.

I looked at a few libraries (Arduino ones) to get inspiration. In LCD_I2C_PCF8574.c I have added a lot of background and links to where you can get hold of other source, documentation and data on the PIC18F2685, I2C, the LCD and IO expander should you be so inclined. I also added a link to the library I ripped for the character generation. Thanks Mario. This file also contains details on how you may want to customise to your implementation, these are tagged with "TODO adapt" so you can use the MPLABX task list to grab them.

I took all my details/nomenclature etc. from an Hitachi hard copy LCD manual (yes hard copy, real paper an"all!) I obtained in the early 1980"s when we were still printing on flattened trees.

The code in main.c exercises all the functionality of the display including reading DD and CG ram and the busy flag. It should give a good heads up on how to use the library. I included a link to a YouTube Video so you can see it"s potential.

You can view similar parts to AC320005-5 when available in the Display Development Kits range under the specifications section at the bottom of the details page.

Authorised distributors including Microchip Technology, Farnell, element14, Newark Electronics and Arrow Electronics have stock available or on a lead time for AC320005-5.

iCA05 - Graphic LCD Development Kit is come with complete set of tools that fulfilled any type of applications (Simple Oscilloscope, Signal Monitoring, Chart Display, etc..). With the external GLCD port, user can easily mount the GLCD at the casing. Also iBoard includes analog ports for sensor input (Temperature, Light, Voltage) with the connections to PIC pins.