any circuit for a humidity sensor

Archiver

Hello. Check out the Earth Measurements text written by Tracy Allen.
It is part of the Stamps in Class program. Dallas Semiconductor has a
ready make humidity sensor for $20 at their online store (part of the
iButton site: http://www.ibutton.com).

Good luck!
--Jeff Wallace

Add a RTC, 256k EEPROM and an I2C bus to your BS2
http://www.high-techgarage.com/products/timekeeper.php

--- In basicstamps@y..., "patel" <hhppatel@m...> wrote:
> HI all
> Can Any one help me with the circuit and the progam to measure a
> humidity range and triger a relay when the range is required and
> when another range comes switch it of i need it to water my plants.
> Dr Patel

Archiver

>HI all
>Can Any one help me with the circuit and the progam to measure a
>humidity range and triger a relay when the range is required and
>when another range comes switch it of i need it to water my plants.
>Dr Patel

By "humidity" do you mean the moisture in the soil, or do you really
mean the ambient humidity of the air? Those take two very different
kinds of sensors. Also, if plants, are they in a garden at different
locations, or in a greenhouse, or pots? How is the water going to be
delivered, e.g., by drip irrigation etc?

-- Tracy

Archiver

HI all
Can Any one help me with the circuit and the progam to measure a humidity range and triger a relay when the range is required and when another range comes switch it of i need it to water my plants.
Dr Patel