Post by thread:thermostat

Hi, Is there anyone can provide me info. on how to make a thermometer using PIC? P.S. By the way, can anybody suggest where to obtain spec. of I2C bus? Regards. Peter Ming Tak Eric Chan________________________ Pager: 7636-1323 Email: Personal: spam_OUTmykonosTakeThisOuTvol.net Business: .....mtericKILLspam@spam@hk.super.net WWW: http://www.geocities.com/Paris/2829 ==================================== Happiness is like the bluebird of Maeterlinck: try to catch it and it loses its colour. It's just like holding water in your hands. The more you squeeze it the more it runs away. ====================================

>Hi, > Is there anyone can provide me info. on how to make a thermometer using > PIC? What are your constraints? Easy programming? Cost? Temperature range? High precision? Here are just a few ideas... Easy programming - how about hanging an LM35 sensor and a cheap op-amp onto the analog input of a 16C6xx Low cost - use a thermistor and a 7555 or similar to make a temperature dependent oscillator. Calibrate this in software. Wide temperature range - use a type-K thermocouple and a AD595 cold junction compensator/amplifier. Feed this into a 12 bit a-to-d with a serial interface. High Precision - Use a platinum resistance thermometer and a commercial linearisation module (or design your own if you feel brave) Feed this into a 16 bit a-to-d with a serial interface. I hope these are some help, Keith. ========================================================== Keith Dowsett "Variables won't; constants aren't." E-mail: kdowsettKILLspamrpms.ac.uk Phone: 0181-740-3162 Fax: 0181-743-3987 Snail mail: MRC Clinical Sciences Centre, Cyclotron Unit. Hammersmith Hospital. London W12 0NN.

>Hi, >Is there anyone can provide me info. on how to make a thermometer using PIC? Well, you need a temperature sensor and some method of output. A thermostat may have outputs to control temperature to either a fixed or variable setpoint. An example of a temperature sensor can be found in application note AN512. Its available in the Embedded Control Handbook and on http://www.microchip.com Regards, Dana Frank Raymond .....dfrKILLspam.....icom.ca

I'm currently developing one using a thermistor I bought at Radio Shack. It works great, and I've got it displaying on three 7-Segment LED Displays. The only problem is with the calibration. I have a scheme for it that works, but I'm having some problems with writing to the EEPROM (to save the calibration value). More as it happens, Myke {Quote hidden}>Return-Path: <EraseMEowner-piclistspam_OUTTakeThisOuTMITVMA.MIT.EDU> >X-Sender: dfrspam_OUTicom.ca >Date: Wed, 21 Aug 1996 10:25:09 +0600 >Reply-To: pic microcontroller discussion list <@spam@PICLISTKILLspamMITVMA.MIT.EDU> >Sender: pic microcontroller discussion list <KILLspamPICLISTKILLspamMITVMA.MIT.EDU> >From: Dana Frank Raymond <RemoveMEdfrTakeThisOuTICOM.CA> >Subject: Re: thermostat >To: Multiple recipients of list PICLIST <spamBeGonePICLISTspamBeGoneMITVMA.MIT.EDU> >X-UIDL: 1fa0aabf60a087c0772bcc95cddd5ce1 > >>Hi, >>Is there anyone can provide me info. on how to make a thermometer using PIC? > >Well, you need a temperature sensor and some method of output. A thermostat >may have outputs to control temperature to either a fixed or variable setpoint. > >An example of a temperature sensor can be found in application note AN512. >Its available in the Embedded Control Handbook and on http://www.microchip.com > > >Regards, Dana Frank Raymond >TakeThisOuTdfrEraseMEspam_OUTicom.ca > > Do you ever feel like an XT Clone caught in the Pentium Pro Zone?