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Honeywell manufactures many temperature and humidity sensors.There are many sensors types and sub types available for both temperature and humidity measurement.The choice of the sensor can be made by based on the required accuracy , operating temperature range etc.
In india Platinum RTD 100 ohms cost around 20$
and HIH 3610 humidity sensor around 60$
Hi Ammamon,
I have heard of a method of doing this with a resistor. I haven't had time to try it yet, but I think it will work well, and do plan on trying it.
You scrape the outside layer off of the resistor to expose the carbon to the atmosphere. The resistance will vary with humidity, and you can use this in an op Amp circuit to measure and scale it to a reasonably linear output.
I have used the Humerel sensors, which work fairly well, but also need to be put in circuit with a 555 timer, which will then output a frequency which is dependent on humidity.
Also the sht1x, or sht7x can output both temperature and relative humidity by SPI, without additional circuits, but they tend to cost more. I have seen these for as low as $10 USD, and as high as $29
The best prices for the sht10s I have seen, is on the site posted just above this one
TechToys. The 80 Hongkong dollars translates to $10.29 USD, and I think it is the best deal for this sensor on the net! Plus, John is very generous in terms of providing information and help.
John, I have been planning on ordering some things from you for a while. (Some of these sensors for sure.) I'm just waiting to see how much the PIC 4550 board will go for. It should be ready very soon, yes?
I was also able to find the small joysticks you are using on the 89s52 boards, here in Korea, for what I think is a very good price. I grabbed a bunch to play with.
Thank you very much for your feedback. With your encouragement, I will speed up the PIC board. The PIC board Should be around the corner now.
Honestly, that job has been put aside for a while because of the workload in getting thru' the AT89S52 board. However, most of the software modules for 89S52 work with PIC C18 even though they are totally different microcontrollers. So there will be less effect in making the PIC board.
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