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DIY Microcontroller Projects for Hobbyists

DIY Microcontroller Projects for Hobbyists

By : Garcia-Ruiz, Pedro Cesar Santana Mancilla
4.5 (17)
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DIY Microcontroller Projects for Hobbyists

DIY Microcontroller Projects for Hobbyists

4.5 (17)
By: Garcia-Ruiz, Pedro Cesar Santana Mancilla

Overview of this book

We live in a world surrounded by electronic devices, and microcontrollers are the brains of these devices. Microcontroller programming is an essential skill in the era of the Internet of Things (IoT), and this book helps you to get up to speed with it by working through projects for designing and developing embedded apps with microcontroller boards. DIY Microcontroller Projects for Hobbyists are filled with microcontroller programming C and C++ language constructs. You'll discover how to use the Blue Pill (containing a type of STM32 microcontroller) and Curiosity Nano (containing a type of PIC microcontroller) boards for executing your projects as PIC is a beginner-level board and STM-32 is an ARM Cortex-based board. Later, you'll explore the fundamentals of digital electronics and microcontroller board programming. The book uses examples such as measuring humidity and temperature in an environment to help you gain hands-on project experience. You'll build on your knowledge as you create IoT projects by applying more complex sensors. Finally, you'll find out how to plan for a microcontroller-based project and troubleshoot it. By the end of this book, you'll have developed a firm foundation in electronics and practical PIC and STM32 microcontroller programming and interfacing, adding valuable skills to your professional portfolio.
Table of Contents (16 chapters)
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Coding a program to send the sensed data to the internet

In this section, we will continue using the NodeMCU development board to receive the data from the STM32 and send it to the internet. However, unlike Chapter 10, IoT Plant Pot Moisture Sensor, where a digital value (1 or 0) was sent directly between both microcontrollers, we now need to send the voltage value using serial communication between these microcontrollers.

Serial transmission is done by sending the data using the RX/TX pins.

Let's create the program to connect the NodeMCU and the STM32:

  1. In setup(), we need to add new serial data transmission to 115200 bps. It is the recommended speed for the NodeMCU board:
    void setup() {
      serial.begin(9600);
      Serial1.begin(115200);
    }
  2. The loop() instance needs a new line after the sensor reading and voltage conversion. The write() function sends the data as an integer value:
    void loop() {
      int sensorValue = analogRead(sensorPin)...

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