AboutDave Nyce Expertise I have been an electronics engineer for 25 years. I can answer questions on analog and digital circuits and my specialty is sensors.
Experience I am the inventor on 23 US patents, and also some foreign ones. Developed sensors for over 25 years. Licensed private pilot (airplane and rotorcraft), have HAM radio license. I'm not an expert in computer networking.
Expert: Dave Nyce Date: 7/1/2008 Subject: rtd interfacing
Question sir i need to interface an RTD with the 8086 microprocessor.
this is a part of my project at a summer internship in a power plant..
sir could you please help me out by giving me a lead..as in how should i begin with this interfacing..and what techniques can be used for this task
i have to design a control system using pid controllers for steam temperature controlling..
im a 2nd yr student of electronics and instrumentation engineering
awaiting ur reply
Answer 1. You can buy an RTD signal conditioner with a digital output type that you'd like to use. They are available from many sources, such as one with RS-485 output from Rhopoint
You can probably also find ones with other types of digital interfaces.
2. Or you could make your own interface module. For that you could use a TLC555 or other CMOS version of a 555 timer, and build the circuit in the application note for an astable multivibrator. Then use an NPO capacitor and the RTD for the timing components. The frequency will vary with the temperature. Look up the RTD nonlinearity curve, and correct for it in the software.
