long distance interface

[GeorgeLewis]

Hi every body,
I want to connect pic microcontroller to a digital humidity-tremprature sensor SHT11 through a 100 meter distance wire. the sensor communicates through 1 serial clock and 1 serial data in a manner like i2c but it is not. the serial data is bidirectional. both signals are TTL.

How can i do that without loosing the signal.
Can I use optocouplers or what??
What is the circuit??
How much this is guarenteed to work and not affected by noise of long distance wires??

Thanks

 

[xxargs]

Hi every body,
I want to connect pic microcontroller to a digital humidity-tremprature sensor SHT11 through a 100 meter distance wire. the sensor communicates through 1 serial clock and 1 serial data in a manner like i2c but it is not. the serial data is bidirectional. both signals are TTL.

How can i do that without loosing the signal.
Can I use optocouplers or what??
What is the circuit??
How much this is guarenteed to work and not affected by noise of long distance wires??

Thanks

RS485?

read appnotes and see if soloution fit for your design.

 

[Bingo600]

Use a uC to read the SHT (on same remote PCB) , and then use the uC to send it via I2C back to the main CPU


/Bingo

 

[SPATAN]

See this circuit **broken link removed**

 

[GeorgeLewis]

See this circuit **broken link removed**

thank u very much SPATAN but the pdf is in a strange language is it a font problem or it is really a strange language