RH/Temp Sensor Example Code

[Christopher4187]

Bruce,

I may use these for my project. From your experience, how accurate are these sensors? It looks like you don't need a vref voltage which is really good, unless I am mistaken.

[Bruce]

Hi Christopher,

I haven't tested with this one for accuracy, but it's one of the easiest to use RH/temp sensors I've seen in a while.

This one has an onboard processor that sends RH & temp out in standard ASCII format. No need for anything analog. It's real simple to use.

[Christopher4187]

Bruce,

I've ordered three temp sensors, two digital and one analog; they should be here tomorrow. I have some additional questions about your code.

1. I am using the USART port on the PIC for something else so I am pretty sure I can use the temp sensor on another pin for serout/serin but does the code have to be manipulated a lot? Instead of writing:

HSEROUT ["RH=",TEMP(1),TEMP(2),TEMP(3),TEMP(4),"% : "]

Can I write

Serout2 portb.1, 396, ["RH=",TEMP(1),TEMP(2),TEMP(3),TEMP(4),"% : "]

2. The result will be something like 98.3 or 104.6 or 35.4 rather than just 35 or 45 or 198? Is this correct?

Thanks,

Chris

[Christopher4187]

I forgot to mention, maybe I can buy a PIC with 2 USART ports and could solve the problem also.

[Bruce]

Hi Chris,

You won't need a PIC with a hardware USART, and you can use any I/O-pin or
serial command you prefer. I just used the USART since I had a board with a
hardware serial connection for the test.