Pool-projekt with pic microcontroller

[klimpfinger]

hi. my name is Johannes klimpfinger. for my graduation i need to make a projekt,wich measures chlorin,temperatur and ph-value. the meassured values should be transmitted via radio
and then displayed on a LCD-dispay.as microcontroller we use a pic(typ not yet secivied)

I wanted to ask if any of you made something like thatand could provide some help.maybe someone has some usefull tipps,ideas. aspecially the trannsmitting and the lcd-display controll should be programmed in the next days. if someone had made LCD-display progs and hardware i would be thankfull to have a look at them as an example.

greetings and thanks for any help

[Nicko]

Re: Pool-projekt with pic microcontroller

I would use some of the very nice serial VHF modules that transmit up to 300mtrs at about 9600 baud, though you would probably only need a very low baud rate. An example is http://www.computronics.com.au/module/txrxpair/index.shtml, but there are many others.

How frequently do you need to read the values? How far do you have to transmit the results.

Sample the transducers with a little PIC, say a 12F629 which has analogue inputs in an 8-pin low power package. Use bit-banging to create an RS232 data stream to drive the transmitter.

Use a PIC16F627 or similar PIC to read the serial data stream from the receiver, then drive a 2x16 LCD with on-board controller.

All the hardware could probably be bought for USD 20. Its easy to make, there are loads and loads of examples for driving LCDs and bit-banging on PICs, both in C and assembler available for free on the web. As a starter, look at the PICList archives, or the usenet news group comp.arch.embedded.piclist (http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&group=comp.arch.embedded.piclist)

HTH,

Nicko



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