Creative DIY Microcontroller Projects with TinyGo and WebAssembly: A practical guide to building embedded applications for low-powered devices, IoT, and home automation

Cover
Title Page
Copyright and credits
Contributors
Table of Contents
Preface
Chapter 1: Getting Started with TinyGo
	Technical requirements
	Understanding what TinyGo is
		How TinyGo works
		Comparing TinyGo to Go
	Setting up TinyGo
		Installing on Linux
		Installing on Windows
		Installing on macOS
		Installing on Docker
	Understanding IDE integration
		VS Code integration
		General IDE integration
		Setting up Goland
		Integrating any editor
	The Arduino UNO
		Getting to know the technical specifications
		Exploring pinout
	Checking out the Hello World of Things
		Getting the requirements ready
		Preparing the project
		Programming the microcontroller
		Flashing the program
		Using TinyGo Playground
	Summary
	Questions
Chapter 2: Building a Traffic Lights Control System
	Technical requirements
	Lighting an external LED
	Lighting an LED when a button is pressed
		Building the circuit
		Programming the logic
	Building traffic lights
		Building the circuit
		Creating a folder structure
		Writing the logic
	Building traffic lights with pedestrian lights
		Assembling the circuit
		Setting up the project structure
		Writing the logic
	Summary
	Questions
	Further reading
Chapter 3: Building a Safety Lock Using a Keypad
	Technical requirements
	Writing to the serial port
	Monitoring the serial port
	Monitoring input from a keypad
		Building the circuit
		Understanding the workings of a 4x4 keypad
	Writing the driver
		Driver variables
		Configure
		GetIndices
		GetKey
		main
	Finding drivers for TinyGo
		Contributing drivers to TinyGo
	Controlling a servomotor
		Understanding SG90 servomotors
		Building the circuit
		Writing the servo control logic
	Building a safety lock using a keypad
		Building the circuit
		Writing the logic
	Summary
	Questions
Chapter 4: Building a Plant Watering System
	Technical requirements
	Reading soil moisture sensor data
		Assembling the circuit
		Finding thresholds
		Understanding ADC in TinyGo
		Writing a library for the sensor
		Testing the library
	Reading water level sensor data
		Writing a water level sensor library
	Controlling a buzzer
		Writing a buzzer library
	Controlling a pump
		Working with relays
		Writing a pump library
	Watering your plants
	Summary
	Questions
	References
Chapter 5: Building a Touchless Handwash Timer
	Technical requirements
	Introducing the Arduino Nano 33 IoT
		Installing Bossa
	Learning to measure distances
		Understanding the HC-SR04 sensor
		Assembling the circuit
		Writing a library
		Unit testing in TinyGo
		Writing an example program for the library
	Using 4-digit 7-segment displays
		Using a MAX7219
		Writing a library to control the MAX7219
		Writing a library to control the hs42561k display
	Putting it all together
	Summary
	Questions
Chapter 6: Building Displays for Communication using I2C and SPI Interfaces
	Technical requirements
	Exploring the TinyGo drivers
	Displaying text on an HD44780 16x2 LCD display
		Building the circuit
		Understanding I2C
		Writing the code
	Displaying user input on the display
	Building a CLI
	Understanding SPI
	Displaying a simple game
		Building the circuit
		Using an ST7735 display
		Developing a game
	Summary
	Questions
Chapter 7: Displaying Weather Alerts on the TinyGo Wasm Dashboard
	Technical requirements
	Building a weather station
		Assembling the circuit
		Programming the weather station
	Sending MQTT messages to a broker
		Implementing the Wi-Fi package
		Implementing an MQTT client abstraction layer
		Implementing the weather station
	Introducing Wasm
	Displaying sensor data and weather alerts on a Wasm page
		Serving the application
		Implementing the weather app
	Summary
	Questions
Chapter 8: Automating and Monitoring Your Home through the TinyGo Wasm Dashboard
	Technical requirements
	Building a home automation dashboard
		Creating a reusable MQTT component
		Setting up the Wasm instantiation code
		Creating the HTML template
		Implementing the login view logic
		Implementing the dashboard component
		Implementing the main logic
		Serving the app
	Building the home automation client
		Setting up the circuit
		Implementing the logic
	Requesting data from the microcontroller
		Checking other implementation ideas
	Summary
	Questions
Appendix – "Go"ing Ahead
	Blocking a goroutine
		Reading from a channel
		A select statement
		Sleeping is a blocking call
	Finding heap allocations
Assessments
	Chapter 1
	Chapter 2
	Chapter 3
	Chapter 4
	Chapter 5
	Chapter 6
	Chapter 7
	Chapter 8
Afterword
	Why subscribe?
About Packt
Other Books You May Enjoy
Index