Use the ESP32 to receive data from the Alexa database and IOT control any device with your voice and from anywhere in the world with internet connection. See the circuit and code with a relay control.

I've made a development board so you could learn and try step by step on how to make my multimeter board and larn a lot of new parts with Arduino.

Control any 220V AC outlet using radio connection all around your home. Homemade project of a PCB that has a 433MHz radio transmitter and another one a receiver and controls a 2A 220V SSR relay.

Tutorial on how to extract a code from an already programmed Arduino in a hexadecimal file adn then upload it back to another Arduino.

How to properly read the data from a MQ-3 gas sensor and detet the % of alcohol in the air with good precision. Then make a homemade alcohol meter breathalyzer with display.

Create the schematic for ESP32 NES console with a TFT display, SD card reader module, music decoder and buttons and uplaod .NES files to the cart an play any old Nintendo games.

Control the movement of two axis of a mirror with coils and magnets using PWM signals from the Arduino. Steering control for a laser dance machine.

Split the light with a diffraction grating, use a digital camera and read the spectrum intensity with the Arduino mega and a TFT display.

Using a Nextion Touchscreen and an Arudino Micro with the Keyboard library we can make a cool stream deck for livestreams.

A PCB with ESP32 an SSR relay and 220V AC converter. Very small IoT control with Arduino code and homemade PCB. Control via Internet from with database from anywhere in the world.

Tutorial on how to make a homemade FOC controller PCB with L6234PD driver for brushless triple phase motors BLDC with closed loop control and AS5048A magnetic encoder.

Homemade handheld multimeter and PCB with multiple modes for voltage, resistance, capacitance, current, inductance, frequency, diode, continuity and more. Measure everything with such a small PCB and 3D case.

How to make filament out of plasitc bottles with a 3D printer nozzle, bottle cutter and a PCB controlled with Arduino for strady temperature and rotating a stepper motor with 3D printed gears.

How to use the MC4725 Digital to Analog converter module with the Arduino and set a steady voltage, signals for sine, square, triangle and sawtooth

Tutorial on how to program the ESP32 with Arduino IDE and make a WIFI connection, create a database and make a IOT project with POST method and php MYSQL

Recognize voice with the Raspberry pi and send the commands with UART to an Arduino. Voice control and Google Speech API tutorial.