wireless temperature controller

[uzaireen]

wireless temperature

Hi All,

I would like to do a project related to wireless room temperature. The reqirements are simply described as follows.

Function: detect Temperature at the transmitter part and the receiver collect temperature data. the temperature increases over 30 degree Celsius in form of LED turn on and the buzzer sound
Communication: Use RF module to transmit and receive data

Power Supply: battery rechargable circuitry
Microcontroller: PIC16f877A
Data output: LCD display to show the information of the temperature

So i would like to obtain some advise from you all. Information like selection of hardware circuitry, source code for the wireless at trasnmitter module and the receiver module, etc....would be welcomed.

Thanks for the help from you guys.

uzai

 

[IanP]

Re: wireless temperature

As it is not crucial temperature reading for a nuclear power station you can use one-way transmission using “el-cheapo” 433MHz modules ..
Here are examples of such devices:
**broken link removed**

Protocol can be very simple ..
The transmitter sends starting byte (quite often it is AAh, and it can be repeated for several times) followed by data string containing temperature reading, checksum and an end-of-transmission character, for example, CR (0Dh) ..
So it may look like the following:

AAh, 33h, 35h, 34h, CheckSUM, 0Dh

AAh – frame start
33h, 35h, 34h – ASCII coded 35.4 deg, you may, or may not use ASCII
ChecSUM – XOR of all characters up to this point ..
AAh xor 33h xor 35h xor 04h = 98h

As temperature sensor you can use the very popular LM335 which has sensitivity of ~10mV/degC
**broken link removed**

Rgds,
IanP

 

[kokabanga]

Re: wireless temperature

https://www.rentron.com/rf_remote_control.htm

 

[uzaireen]

Re: wireless temperature

how to make coding for wireless temperature. i have fully coding temperature control. how to make the coding in the form of wireless