It's NOT working on pins 37 and 38 (and maybe other pins), but it IS working on pins 25, 26, 27 !!! Source: I tested this today, it's working like a charm!. But the good news is that the "Serial.begin" function has an option to change the pins! By using "Serial2.begin(9600, SERIAL_8N1, 25, 26) " you have the Serial2 port on pins 25 (Rx) and 26 (Tx). The default pins are 3 (Rx) and 1 (Tx) for Serial(0) ,Īs you can see, with the limited number of pins on this TTGO board, none of them are there.For different embedded devices, you will need to check on the datasheets to understand which pins can be used for UART.įor example, this is a table for UART pins on common Arduino boards. It has two data lines, one to transmit (TX) and another to receive (RX). It is a simple serial communication protocol that allows the host to communicate with the other devices. UART (stands for Universal Asynchronous Reception and Transmission ). In this article, I would be focusing more on the UART serial communication protocol as think it would be the easiest to get started with. Note: You need to check on the hardware's datasheets to make sure the UART/SPI/I2C pinouts are available. UART, SPI, and I2C are the common hardware interfaces people use in microcontroller development when we’re talking communication protocols. More specifically, the data bits are transmitted one at a time in sequential manner over the data bus or communication channel in Serial Communication. one after the other then the communication protocol is known as Serial Communication Protocol. This exchange of data bits in microcontroller is done by some set of defined rules known as communication protocols. In embedded systems, the communication means the exchange of data between two microcontrollers in the form of bits. The communication is very well known terminology which involves the exchange of information between two or more mediums. What’s Serial Communication? Before starting with Serial Communication Protocols, Let’s break the terminology in three parts. How to use UART to communicate between two boards?.Why Serial Communication Between Embedded Devices?.In this Part 1 detailed article, I will be covering the following: In this Part 1, I will be discussing serial communication using the hardware UART pins available on the embedded devices.įor Part 2, I will be discussing serial communication between your laptop device with the external embedded devices using popular Python programming language.
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