A site about programming, IoT and technology. Find tutorials for many different projects.
In this tutorial we will check how to create a very simple alarm system with a buzzer and a PIR motion sensor. We will be using the Arduino core, running on the ESP32. The tests were performed using a DFRobot’s ESP32 module integrated in a ESP32 development board, and a DFRobot’s PIR sensor module. Introduction In this tutorial we …
Continue reading "ESP32 Arduino: Alarm with PIR motion sensor and buzzer"
In this tutorial, we will check how to draw circles in an image with OpenCV and Python. Introduction In this tutorial, we will check how to draw circles in an image with OpenCV and Python. One common task when using OpenCV is detecting regions of interest with some computer algorithm vision. So, it makes …
In this tutorial we will check how to interact with a PIR motion sensor using an interrupt based approach, using the Arduino core running on the ESP32. The tests were performed using a DFRobot’s ESP32 module integrated in a ESP32 development board, and a DFRobot’s PIR sensor module. Introduction In this tutorial we will check how to interact with …
Continue reading "ESP32 Arduino: PIR motion sensor and interrupts"
In this tutorial we will check how to use a PIR sensor to detect motion, using an ESP32 and the Arduino core. The tests were performed using a DFRobot’s ESP32 module integrated in a ESP32 development board, and a DFRobot's PIR sensor module. Introduction In this tutorial we will check how to use a PIR sensor to detect …
In this tutorial we will check how to save an image to the file system using OpenCV on Python. Introduction In this tutorial we will check how to save an image to the file system using OpenCV on Python. As we have been covering in previous tutorials, OpenCV allows us to read and manipulate images, …
Continue reading "Python OpenCV: Saving an image to the file system"
In this tutorial, we will check how to get user input from the shell, using Python on the Raspberry Pi. This tutorial was tested on a Raspberry Pi 3 model B+, running version 4.9 of Raspbian, installed using NOOBS. The Python version used was 3.5.3. Introduction In this tutorial, we will check how to get user input from the …
Continue reading "Raspberry Pi 3 Raspbian: Getting input from the Python shell"
In this tutorial we will check how to setup a simple Flask server on the Raspberry Pi and send HTTP POST requests to it from the ESP32. Then, we will access the body of the request on the Raspberry Pi. The Python version used on this tutorial was 3.5.3 and it was tested on a Raspberry Pi …
Continue reading "Raspberry Pi 3 Flask: Receiving HTTP POST Request from ESP32"
In this tutorial we will check how to setup a very simple Flask server on the Raspberry Pi and send HTTP GET requests to it from an ESP32 running the Arduino core. This tutorial was tested on a Raspberry Pi 3 model B+, running version 4.9 of Raspbian, and on a DFRobot’s ESP32 module integrated in a ESP32 development board. Introduction In this …
Continue reading "Raspberry Pi Flask: Receiving HTTP GET Request from ESP32"
In this tutorial we will check how to perform string interpolation in Espruino running on the ESP32. The tests were performed using a DFRobot’s ESP32 module integrated in a ESP32 development board. Introduction In this tutorial we will check how to perform string interpolation in Espruino running on the ESP32. It's important to mention that string interpolation is a …
Continue reading "ESP32 JavaScript Espruino: String interpolation"
In this tutorial we will analyze how to use the C++ conditional operator, also known as the ternary operator, on the Arduino core running both on the ESP32 and on the ESP8266. The tests on the ESP32 were performed using a DFRobot’s ESP-WROOM-32 device integrated in a ESP32 FireBeetle board. The tests on the ESP8266 were performed on a DFRobot’s ESP8266 …
Continue reading "ESP32 / ESP8266 Arduino: Conditional operator"
techtutorialsx 