Construir un pulsógrafo con XO

   
   
   
   
   

Se presenta aquí el montaje de un sensor que al colocarse en una persona, permite monitorear su pulso en la pantalla de la XO, mostrándose un gráfica de "pulso en función del tiempo" donde a cada máximo ("pico") le corresponde un latido cardíaco. El sensor se conecta a la entrada mic y USB de una XO-1 y el programa está hecho en "TurtleBlocks" v.109.

Está previsto programar el cálculo para la posterior impresión en pantalla de la frecuencia cardíaca, si bien podría extraerse este dato modificando este programa para que imprima en pantalla los valores medidos.


Introducción

La Pulsioximetría es un método no invasivo que permite determinar el nivel de saturación de oxigeno de la hemoglobina de un paciente.

Para realizar esta técnica, se coloca un sensor en una parte delgada del cuerpo,....lo cual permite determinar la absorbancia causada únicamente por la pulsación de la sangre arterial. (Hay más información en http://es.wikipedia.org/wiki/Pulsioximetr%C3%ADa y http://es.wikipedia.org/wiki/Ox%C3%ADmetro_de_pulso.)

Nota: la aplicación que mostramos aquí se basa en la pulsioximetría pero no es un ejemplo de este método.

Implementación

pulsografo implementacion
Kick-off for OLPC in NKR

Un LED blanco de alto brillo, conectado en serie a un RESISTOR adecuado se enciende alimentado por 5VDC del puerto USB. Este LED ilumina un LDR (en este caso el GL12537) conectado a la entrada mic de una XO1. Si se disponen en los extremos de una pinza para ropa y se coloca entre ellos una zona como el lóbulo de la oreja o la piel que une el dedo pulgar con el índice de la mano, cada pulsación sanguínea producirá un cambio en la intensidad de luz que incide sobre el LDR, con la variación correspondiente en su resistencia. El programa "TurtleBlocks" v.109 muestra en pantalla la resistencia del LDR en función del tiempo, monitoreando el pulso del "paciente".

Con los valores de voltaje Vled e Iled, puede calcularse el valor de resistencia R y potencia (mínima) P del resistor, como:

pulsografo formula

Al conectar el LED debe respetarse su polaridad, pues de lo contrario, no enciende.(PRECAUCIÓN: tenga mucho cuidado en NO conectar los cables rojo(+) y negro(-) del USB directamente entre sí, ya que podría quemar la XO1, produciendo un daño irreparable!. Si no está seguro, alimente el led con 3 pilas AA o AAA. En este caso usar 4.5V en vez de 5V en los cálculos).

Puede utilizarse el LDR indicado o cualquiera cuya resistencia al ser iluminado se encuentre entre 700 y 14000 ohm (rango de medida de XO1).

Guzmán Trinidad es profesor de física en el Liceo de Solymar, Uruguay. Esta documentando sus proyectos del uso de los XO en la física y biología en este sitio web.

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2 Comments

Buenas tardes.
Soy Henrique y estoy trabajando en el grupo XO/UNICAMP (http://www.nied.unicamp.br/xounicamp/).
Estamos tratando de implementar el pulsógrafo y ahora tienemos el Turtle Blocks. Hemos visto el vídeo en la tabla que mide los latidos del corazón, pero no pudo encontrar los gráficos en los Turtle Blocks.
Por favor, nos puede ayudar?
Gracias
UNICAMP - Universidad Estatal de Campinas (http://www.unicamp.br/unicamp/es)

Hola.
El pulsógrafo funciona en base a una XO1 con SUGAR DEXTROSE, programado en "TurtleBlocks" versión 109 (en esta funciona, en otras, no probé aún).
Mi dirección de correo es [email protected]

Si lo desean les envío los bloques de programación para que puedan poner en funcionamiento el sensor. Saludos, Guzmán Trinidad.

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  • Dear sir
    I have one question to sir?

    -1 why XO Tablet children play OK but when h …

    Comment on The XO Tablet - A First Impression in 750 Words

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