Hay muchas aplicaciones en las que se necesita un sensor preciso de humedad. Una sugerencia para el proyecto es el HDC2080 de Texas Instruments que tiene una precisión de 2% a 3% en el rango de 0 a 100%. En este artículo se incluyen algunas consideraciones sobre el uso de este componente.

Este artículo fue redactado a partir de la información obtenida en el propio datasheet del componente, que se puede acceder a: http://www.ti.com/lit/ds/symlink/hdc2080.pdf. Para la compra a través de Mouser Electronics acceda a: https://www.mouser.com/new/Texas-Instruments/ti-hdc2080-digital-sensor/.

Entre las aplicaciones sugeridas para este sensor podemos citar los termostatos, lavadoras, secadoras, impresoras y mucho más.

La corriente consumida es muy baja, del orden de 300 nA a 550 nA. El rango de tensiones de alimentación va de 1,82 a 3,6 V. El componente es compatible con la interfaz I2C.

En la figura 1 tenemos un gráfico que muestra la precisión del componente.

 

Figura 1 - Precisión RH (humedad relativa)
Figura 1 - Precisión RH (humedad relativa)

 

 

La envoltura de este componente con las funciones de los pines se muestra en la figura 2.

 

 Figura 2 - Pines y funciones
Figura 2 - Pines y funciones | Haga click en la imagen para ampliar |

 

 

Los valores límite máximo, las condiciones de funcionamiento y las curvas de rendimiento se deben consultar en el datasheet.

En la figura 3 tenemos un circuito de aplicación típico con una esfera digital y un microcontrolador.

 

 

Figura 3 - Circuito de aplicación
Figura 3 - Circuito de aplicación

 

 

El detalle del funcionamiento de esta aplicación también se puede encontrar en el datasheet.

 

 

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