Temperature controller, Electrical Engineering

Assignment Help:

This assignment concerns the planning of a software development. You are required to plan the software development for a typical microprocessor based, 4-channel temperature controller. You should assume the hardware has already been defined and planned.

Specification

Key Features

• A small LCD display, 4 lines, each of 32 characters

• A small keypad with 7 keys:

o select Commissioning mode

o select Programming mode

o select Run mode

o Inc - allows the user to increment a value

o Dec - allows the user to decrement a value

o Move right/up - allows the user to move right on a display line or up to the next display line

o Move left/down - allows the user to move left on a display line or down to the next display line

Inputs

• Temperature - analogue inputs, between 0 and 100 degrees Centigrade, 4 channels

• Keypad - digital levels, 7 bits

Outputs

• 4 voltage-free relay contacts, to switch 240V mains. The four relays are reed relays, one for each channel.

Operation

• Pressing any of the three mode keys enters the selected mode. Pressing the key again exits that mode and leaves the unit in aninactive state.

• In Commission mode, the user must be able to set the date and time (today's date).

• In Programming mode, the user must be able to set the time for which each channel relay operates if the measured temperature is less than the channel low temperature limit, or greater than the channel high level temperature limit.

• In Programming mode, the user must be able to set both a low and high level temperature limit for each of the system channels. If the channel temperature is less than the channel low limit, the channel relay contacts are closed. If the channel temperature is greater than the channel high level limit, the channel relay contacts are opened.

• When the user presses the Run key, the product enters the run mode if all the necessary channel data has been set. Pressing the

Run key a second time puts the unit into an inactive state.

• During Run mode the data for each channel is displayed and the user can scroll round the channel data using the Inc and Dec keys.

• In addition to three modes described, a Self Test mode is to be provided. Self Test is entered when power is applied with all three mode switches depressed.


Related Discussions:- Temperature controller

Generator, loses and efficency of generator

loses and efficency of generator

Bronze is an alloy of which metal, Bronze is an alloy of  (A) Copper....

Bronze is an alloy of  (A) Copper.  (B)  Aluminium. (C)  Silver.  (D)  Carbon. Ans: Bronze is an alloy of copper.

Basic working of optical coupler, Q. Basic working of optical coupler? ...

Q. Basic working of optical coupler? The optical coupler is suitable for frequencies in the low megahertz range. The photodiode type shown above can handle only small currents;

Find the current flow through a resistor, Q. Find the current flow through ...

Q. Find the current flow through a resistor ? Consider the circuit shown in Figure (a). Reduce the portion of the circuit to the left of terminals a-b to (a) a Thévenin equival

Operation of an integrating circuit, Q. What is the principle of operation ...

Q. What is the principle of operation of an integrating circuit? The RC integrator is typically a series RC circuit that uses the capacitor to develop its output. Since voltage

Power distribution, Power Distribution You will study about the legisl...

Power Distribution You will study about the legislative measures that have been taken by our government to address these challenges. In particular, we discuss the Energy Conse

Power mosfet - power semiconductor devices , Power MOSFET MOSFET stands...

Power MOSFET MOSFET stands  for metal oxide semiconductor fields  effect transistor.  A power  MOSFET has  three  terminal  drain source  and  gate,. It  is unipolar device  me

Ic packaging, which type of ic package is more advantageous,suitable and ve...

which type of ic package is more advantageous,suitable and versatile

What do you mean by bezier curve, What do you mean by Bezier curve? Shown B...

What do you mean by Bezier curve? Shown B0 (1,1), B1 (2,3), B2 (4,3), B3 (3,1) the vertices of Bezier polygon, calculate seven points on Bezier curve. Write in brief the differe

Linear and digital ics, write down the application of shift register and ex...

write down the application of shift register and explain it.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd