[ElectroValvulinx]

Este último mes hemos estado desarrollando todo un sistema de electroválvula para automatizar el proceso de llenado de depósitos de agua que usamos para su consumo.

Tener que subir la cuesta para abrir el agua cada vez que los depósitos se vacían ha perdido la gracia, por muchas grabaciones, setas y oscuridades internas del bosque.

El sistema funciona así:

valve-diagram

Arriba del monte en la caseta del agua montamos la electroválvula, un sensor de caudal (flow meter) y un picogenerador (que no se muestra en la imagen) al tubo del agua. Este picogenerador genera corriente DC (creo que 12V) cuando un caudal fluye por él. Este dispositivo consta de un motor electrónico (bobinado e imanes) que (como todo motor electrónico) si le suministras voltaje rota y, viceversa, si rotamos su eje produce voltaje. Por lo tanto, el picogenerador es lo que retroalimenta la bateria que usamos para abrir y cerrar la electroválvula. La bateria va conectada a la electrova¡álvula y mediante reguladores al arduino “electrovalvulinx” y (del otro sentido) al picogenerador (ya que entra la corriente a la bateria, no sale). Al electrovalvulinx conectaremos el receptor que recibe la señal emitida desde la parte de los depositos según si hay que abrir o cerrar la válvula.

En la parte de abajo donde los depósitos añadimos otro sensor de caudal al tubo del agua y dos sensores de nivel y de temperatura dentro de los depósitos. Estos sensores de nivel detectan la disminución del nivel del agua, y mediante arduino un trasmisor emite la señal hasta donde se encuentra la electroválvula.

Con un sensor de caudal arriba y otro abajo del tubo del agua, podemos calcular si la presión del flujo disminuye indicando así una fuga en el recorrido.

Desde el arduino de los depósitos conectamos un tp-link hackeado que manda la información de todos los sensores.

Desde Hacklab se ha desarrollado el código, añadiendo gráficas de todos los sensores, esquemas y imágenes como esta de arriba.

Desde Pechblenda se ha desarrollado el hardware.

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[Medicarduino] Protesis

Navegando por la red encontré este blog dedicado a “proyectos relacionados con medicina y salud con arduino”.

El nombre no me gusta mucho, ni su imaginación en cuanto al concepto del proyecto. Pero, los proyectos molan un montón!

–> Arduino Wireless Animatronic Hand

–> BrailleDuino

–> Haptic Feedback device for the Visually Impaired

[Voices from the Grave, LM386 IC & Evil Genius power supply]

51 High-tech practical jokes for the Evil Genius” written by Brad Graham and Kathy McGowan is one of the multiples books that we can find inside the “Evil Genius collection” dedicated to electronic circuits, schematics and learning.

evilgenius_pic

As the title shows, this one is dedicated to practical jokes which believe me, some can be very funny, some others are pretty scaaary and others can be really painful!…jjj

Evil Genius has a long collection of pdf related to sciences, knowledge and practical projects documented achieving theoric and practical aspects and focused on the learning by doing, that will make your learn fast, accurate and  having some fun.

Just be careful, cause some pdf of this collection are out-of-time such as the Spy Gadgets pdf where they use VHS to develop a video project. :SS

For this time I wanted to leave here the schematics from Voices from the Grave circuit found in the pdf up here. (project 22)

This device is supposed to scare all your visitors, friends and w/e cause from any sound source , mp3, radio, or microphone …  will generate a scary and horrible noise that will sound just as if the sound was coming from hell, as if the voice talking was from 15 feet under.

So, the responsible to produce this effect is that the signal is carried on a beam of weak infrared light and detected by a phototransistor in the receiver circuit producing that the received audio will seem to fade in and out with a ghostly static.

In this device, we will have 2 circuits that use the same IC (LM386 integrated circuit) both working with 9V batteries power supply.

TRANSMITTER (that has an audio input and takes sound from a mp3 source, and that has an infrared led as output)

trans_voices_schemThe 100ohm resistor can also be swapped for a lower value between 10 & 50 ohms if you want to try pumping up the output from the infrared led. This circuit is so easy that I did not use a circuit board, I just soldered them directly. If you do so, add a bit of hot glue to the components after the unit has been tested.

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RECEIVER (that has a phototransistor as input that detects the modulated signal sent by the transmitter and amplifies the signal having as an output a jack or minijack  end.)

reciev_voices_schemThe output signal sent by the infrared led in the transmitter circuit is detected by a NPN Phototransistor becoming the modulated voltage for the input in the receiver circuit. Doesn’t matter which type, just a standard one. The 10microF capacitor can be removed from the circuit or added to a switch if you find that the receiver’s output is too loud, as this controls the gain of the amplifier. You can also add a 50Kohm potentiometer soldered in series with one of the headphone wires that will become the volume control.

Because of the extreme sensitivity of the phototrans to any light changes, the unit will also pick up all ambient light sources resulting in some ghostly crazy sounds.

images

LM386 pin-out: (always check on the datasheet)

LM386 is an op amp that can amplify signal input til a gain of 200 if we connect some components around it. Internally has a gain of 20 already, but we can stronger its capacity by building this next schematic circuit down here:

lm386_gain200

Other posible (between many) circuit to build with LM386 is a Low Distorsion Power Wienbridge Oscillator:

low_dist_power

And last but not least: A square wave oscillator:

square_wave_oscill

Here is a pdf to play with: http://www.nari.ee.ethz.ch/wireless/education/PPS/PPS02/doc/LM386.pdf

[40106 Dual Oscillator]

A simple Schmitt Trigger circuit using one 40106 to create two independent oscillators                                       From http://beavisaudio.com/

40106Dual 

Un simple circuito Schmitt Trigger usando un 40106 para crear 2 osciladores independientes                                 De http://beavisaudio.com/

 

[XCircuit]

xcircuit

Intentando descifrar el código de funcionamiento de Kicad (sin tutorial en mano, o más bien ojos..) conocí XCircuit.

Se trata de un programa desarrollado en software libre para diseño, dibujo y calculo de diagramas, esquemáticos y circuitos electrónicos en general.

Esta vez con tutorial en pantalla, [XCircuit] abre puertas a la construccion, diseño y experimentación digital de circuitos flexibles y modificables, sin follones protoboardinos ni soldatriles.

Miau!

[english version below]

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