The objective of this post is to explain how to declare and handle simple variables in MicroPython, with the ESP8266. Introduction The objective of this post is to explain how to declare and handle simple variables in MicroPython, with the ESP8266. First of all, we need to take in consideration that Python is both a …
ESP8266: MicroPython support
The objective of this post is to explain how to use MicroPython on the ESP8266. Introduction The objective of this post is to explain how to use MicroPython on the ESP8266. MicroPython is an implementation of Python that includes a small subset of the Python standard library and is optimized to run on microcontrollers [1]. …
Python OpenCV: Face detection and counting
How to perform face detection and counting in images, using Python and OpenCV
Oracle SQL: Row locking on select statement
The objective of this post is to explain how to lock a record on a Oracle Database, using a select statement. Introduction The objective of this post is to explain how to lock a record on a Oracle Database, using a select statement. This allows us to lock a record without the need to change …
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SQL Developer: Executing queries in different transactions
The objective of this post is to explain how to execute queries in different transactions using SQL developer. Introduction The objective of this post is to explain how to execute queries in different transactions using SQL Developer. This way, we can execute queries simultaneously and test aspects related to concurrent transactions accessing the same tables …
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Python OpenCV: Reading and displaying an image
The objective of this post is to explain how to read and display an image with Python and OpenCV. Introduction The objective of this post is to explain how to read and display an image with Python and OpenCV. This will be a very simple introductory code. You can check here how to install OpenCV …
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ESP32: Sending JSON messages over MQTT
The objective of this post is to explain how to send JSON messages over MQTT using the ESP32. Introduction The objective of this post is to explain how to send JSON messages over MQTT using the ESP32. To do so, we will be using two libraries that handle the low level details and expose us …
ESP32: Creating JSON messages
The objective of this post is to explain how to create JSON formatted messages using the ArduinoJson library and the ESP32. Introduction The objective of this post is to explain how to create JSON formatted messages using the ArduinoJson library and the ESP32. You can install this library via Arduino IDE libraries manager, as indicated in this …
LinkIt Smart 7688 Duo: Publishing messages to MQTT topic
The objective of this post is to explain how to use the LinkIt Smart 7688 Duo to publish messages to a MQTT topic. Introduction The objective of this post is to explain how to use the LinkIt Smart 7688 Duo to publish messages to a MQTT topic. To do so, we will use a Python …
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LinkIt Smart 7688 Duo: Subscribing to MQTT topic
The objective of this post is to explain how to connect to a MQTT broker and subscribing to a topic, using the LinkIt Smart Duo. Introduction The objective of this post is to explain how to connect to a MQTT broker and subscribing to a topic, using the LinkIt Smart Duo. This will be done …
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