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DIY Microcontroller Projects for Hobbyists

You're reading from  DIY Microcontroller Projects for Hobbyists

Product type Book
Published in Jul 2021
Publisher Packt
ISBN-13 9781800564138
Pages 320 pages
Edition 1st Edition
Languages
Authors (2):
Miguel Angel Garcia-Ruiz Miguel Angel Garcia-Ruiz
Profile icon Miguel Angel Garcia-Ruiz
Pedro Cesar Santana Mancilla Pedro Cesar Santana Mancilla
Profile icon Pedro Cesar Santana Mancilla
View More author details
Toc

Table of Contents (16) Chapters close

Preface 1. Chapter 1: Introduction to Microcontrollers and Microcontroller Boards 2. Chapter 2: Software Setup and C Programming for Microcontroller Boards 3. Chapter 3: Turning an LED On or Off Using a Push Button 4. Chapter 4: Measuring the Amount of Light with a Photoresistor 5. Chapter 5: Humidity and Temperature Measurement 6. Chapter 6: Morse Code SOS Visual Alarm with a Bright LED 7. Chapter 7: Creating a Clap Switch 8. Chapter 8: Gas Sensor 9. Chapter 9: IoT Temperature-Logging System 10. Chapter 10: IoT Plant Pot Moisture Sensor 11. Chapter 11: IoT Solar Energy (Voltage) Measurement 12. Chapter 12: COVID-19 Digital Body Temperature Measurement (Thermometer) 13. Chapter 13: COVID-19 Social-Distancing Alert 14. Chapter 14: COVID-19 20-Second Hand Washing Timer 15. Other Books You May Enjoy

Connecting a soil moisture sensor to the Blue Pill board

We will start this section by learning how to use a sensor to measure soil humidity in a plant pot, and you will later learn how to connect it to the STM32 Blue Pill board to build a plant pot moisture-monitoring system.

Introducing soil moisture sensors

A soil moisture sensor consists of two pads that measure the amount of water in the soil. The sensed value is acquired by allowing the the electric current running through the soil to pass through, and according to resistance, this shows the level of humidity in the plant pot.

You can find a generic breakout module that is pretty straightforward to use. This is shown in the following photo:

Figure 10.1 – Soil moisture sensor breakout board

Figure 10.1 – Soil moisture sensor breakout board

The pads are connected to the breakout board with the included female-to-female jumper wires. The breakout board connects to the STM32 Blue Pill board with four pins, outlined as follows:

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