A first idea for a super simple RS232 temperature probe with the temp PIC

Jan Panteltje · 2009-08-13T19:06:29+00:00

I have made it even simpler, and managed to interface the PIC to RS232 _without_any extra parts.Test setup: ftp://New diagram: ftp:// Asm code: This is new asm code, you can select non-inverting RS232, this omits the MAX232or transistors.An advantage of doing RS232 in software :-)The idea is based on DTR being positive, and supplying about 10 mA to the 5.1 Vzener.The PIC will switch the RS232 between 0 and +5V.This works great on the USB to RS232 adaptors I have :-)Only 3 parts!The cap needs to be next to the PIC, use a small one, low thermal mass,perhaps cut of some of the PIC pins, even lower thermal mass...Or use a smaller package perhaps. The zener needs to be in a spot that does not heat up, for example the connector.So this gives you a super cheap temp sensor with RS232 out... You can log tempstoo.There is also a programmable temperature alarm output on pin 2, not used in thisexample.

Aug 13, 2009 40 Replies

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Rich Grise 17 years ago

Because he's a devotee to the Church of PIC? ;-)

Cheers! Rich

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A first idea for a super simple RS232 temperature probe with the temp PIC

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