You can get the full working example from GitHub and run on a Raspberry Pi after you correctly connected a GPS module.Īs you can see in the output, each data line (starting with $GP.) is logged. isOpen ()) Running the application on Raspberry Pi print ( 'Waiting till serial port is open' ) while (!serial. open () // Wait till the serial port is openĬonsole. Serial port is open, we run a thread to handle the incoming data. Within this context we can then configure and open the serial port. Initialize the serial portįirst Pi4J needs to be initialized. In the readme of the coding example, you can find the description how you can test the GPS module in the terminal The GPS module used in this example: NEO-7M. In V.2 this listener is no longer provided but canĮasily be achieved with a Thread to handle the incoming data. That example uses V1 of Pi4J with a listener provided by the library.

This example is based on anĮxample from the book “The Definitive Guide to Modern Java Clients with JavaFX” by Stephen Chin, Johan Vos and James Weaver. The following example demonstrates how you can connect to a GPS module to read the data. Identical to the other GPIOs, they useģ.3V so make sure, when you connect other devices, the same voltage is used. The Pi has two built-in connections to GPIOs BCM number 14 (TX) and 15 (RX). Higher (19200, 38400, 57600, 115200) speeds, depending on the speed which can be handled reliably by the device. The most used speed is 9600 bps, but you can use lower (1200, 2400, 4800) or This speed is called the “baud rate” with a value indicating the number ofīits per second (bps). Need to handle the data at the same speed. Serial communication is done at a predefined speed which needs to be known on both sides, as both the sender and receiver full-duplex: both devices can send and receive at the same time.half-duplex: devices can only send or receive at once.simplex: one direction only without a message back to confirm the receiving.The communication between these two devices can happen in different ways: When you need two-way communication, two wires are needed between RX and TX from both sides: In a sequence, through a single wire from a transmitter (= TX) to a receiver (= RX). Serial communication can be used to transfer data between different boards, devices, etc.

Serial tx rx gnd