In this project we see how to build a device that detects maturation stages based on color with a neural network model. As fruits and vegetables ripen, they change color due to the four families of pigments: chlorophyll (green), carotenoids (yellow, red, orange), flavonoids (red, blue, purple), betalain (red, yellow, purple). These pigments are groups…
The author’s goal was to build a huge floor piano using readily available and inexpensive materials. The result is astounding considering it was built entirely at home. The current version cost him $ 300 per octave (mainly due to the wood and translucent acrylic, and about $ 50 for electronics) and $ 50 for the…
The oximeter is a tool that allows you to calculate the percentage of oxygen saturation in the blood based on the amount of light absorbed. It consists of a photodiode and two LEDs: a red LED and an infrared LED. To make the measurements, the fingertip is placed between the photodiode and the LEDs as…
Have you ever wondered why smartphones are called smartphones? Because they are smart, right? They do some jobs automatically, intelligently. This is the short answer. For example, mobile phones have an automatic brightness control system, which is very useful. But for unknown reasons, computers don’t have an automatic brightness control system. To change the brightness,…
If you often happen to make solenoids, tesla coils, inductors, electromagnets or coils in general, you may want to consider building this project or just take inspiration to make bigger ones. The system is composed of several PVC pipes that form the structure, an Arduino Uno, two NEMA17 stepper motors controlled by the special shield…
The idea for this project came to its creator when he began researching the principle behind commercially available pet dispensers; these all work the same and the difference in monetary terms depends on the controller used. An important point though is that these purchasable food dispensers are generally designed for specific applications, for example the…
As we know, Arduino Uno includes a 10-bit ADC (analog-to-digital converter) inside its ATmega328p, which takes a signal between 0 and 5V and produces a digital value that varies from 0 to 1023. However, attempting to measure any voltage above 5V will cause some less than desirable results, such as creating magic smoke and destroying…
We develop and test applications with the Pro midi 1284P board. Recently we have introduced and described a new prototyping board called PRO midi 1284, based on an ATmega 1284P microcontroller; after this presentation, made in a previous post, we start to work with it and we explain how to interface it in…
This project was inspired by the vision of a real boat equipped with various sensors capable of measuring the depth of the seabed; we therefore thought of building an autonomous small-scale boat to perform the same tasks. This could be equipped with the necessary sensors and programmed to guide you along a desired path and…
It is halfway between an Arduino Mini (in size) and an Arduino Mega in terms of computational capacity, available memory and integrated peripherals. Since the creation of the Arduino project and the subsequent spread of the original boards, the electronics industry and especially the nascent electronics industry for Makers, has moved in two directions:…
Lots of components to make applications that can be programmed with Arduino and assembled like LEGO bricks. How many times did you dream of building something with LEGO bricks when you were a child and see it moving, animated, perhaps integrating a certain amount of programmable electronics to keep up with the times?…
Let’s interface our Energy Meter with Internet to bring measurements to the ThingSpeak platform and see the results in convenient graphs. A few posts ago, we introduced the MCP39F511 integrated circuit, capable of performing electrical measurements in single-phase electrical systems through the FT1346M board. We have integrated it with the GSM board and…
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