Saturday, August 23, 2014

Microcontroller and SBC in Real World

details required for... Atmels 89C52 Microcontroller A/D D/A converter Keypad LCD display(Or LED Display) 5V Regulated power supply. Temperature & Humidity controller using PID control algorithm implemented using Atmel's 89C52 microcontroller for a AHU unit ( Analog Input from the sensor(4 wire) 0-10v dc & Output from Microcontroller is 4-20mA to the Actuator through a DAC converter).

The Temperature & Humidity to be controlled are 24±1 degree Celsius and 55%±2% Rh respectively. provide me with good LINKS.

mail from SA

Get a sensor that gives a 0-10V or 4-20mA proportional to RH% and Temp deg C. what you need to do now is to select a A/D and a D/A for a real world interface

you can visit these links.......

DigiThermo Wichit Sirichote

DigiThermo 0-100.0 °C Wichit Sirichote

Build your own a laboratory instrument for measuring time and temperature. The DigiThermo demonstrates the use of 'C' language, a dual-slope converter, LCD interfacing, and digital filtering as well..

The Assembly language program for this may be the complex, due to PID. and my uC pages micro-delabs also in my other pages you can find theory on PID etc, in them i have MCS51 code for 2 setpoint process controller.

delabs

Other uC projects sites links

Temperature and Humidity Meter -  This project is a combined temperature and humidity meter. It is an improvement on my PIC-based humidity meter and my PIC and AVR thermometers. I use an ATmega164, which as lots of I/O and memory.
    Temperature and humidity measurements with the AVR web-server- The tuxgraphics Ethernet board has a lot of general purpose IO pins where external hardware such as sensors can easily be attached. In this example we use the sensirion sht11 sensor to measure temperature, humidity and calculate the dew point.

    Friday, August 22, 2014

    Working with SMD and SMT PCB

    One thing tho, i would like to request you to send me some procedures on how to work with surface mount devices (SMD's). I cant get the IC as DIP so i have no choice but improvise an SMD. What is your most professional advice on this? Is it possible you could help me with any procedures for using an SMD on a PCB circuit?.

    mail from CM

    Study These Links.........

    fpga4fun.com - SMD Surface Mount Device and SMT Surface Mount Technology

    you may need a big tabletop magnifier with light and a fine tip soldering iron to get started. It may be difficult and needs a lot of practice, but many people are able to do it.

    Surface-mount technology - Wiki

    Surface-mount technology - Wiki

    An SMT component is usually smaller than its through-hole counterpart because it has either smaller leads or no leads at all. It may have short pins or leads of various styles, flat contacts, a matrix of solder balls (BGAs), or terminations on the body of the component.

    Introduction to Surface Mount Technology and Surface Mount Devices

    By Dean F. Poeth, II, Ph.D., P.E., C.Mfg.E.
    For the Small Manufacturer and Hobbyist: Prototype Manufacturing, Rework, and Repair Techniques

    SMDs have improved performance over through-hole components due to their smaller size, shorter internal leads, and smaller board layouts. These factors reduce the circuit’s parasitic inductance and capacitance. SMDs can also be more cost effective than traditional through-hole components due to the smaller board size, fewer board layers, and fewer holes.

    Hints and Tips for using Surface Mount Technology (SMT) 

    What is Surface Mount Technology? Put Simply - It is a type of electronic component
    package. Most electronic components can be divided into two categories - through hole (TH)
    and surface mount (SM). Through-hole components have been used for many years and are
    designed to be loaded on one side of a printed circuit board (PCB) and soldered on the other.
    SM components are designed to be loaded and soldered on the same side of the PCB.

    Luke Enriquez. Rev 1.3. August 2001.
    VK3EM PO Box 98, Kerrimuir, Vic. 3129. Australia

    delabs

    Tuesday, August 19, 2014

    Datasheets and IC Application Notes

    where can I find on IC data and their application?  mail from EA

    Answer by delabs

    Vintage DataBooks are a valuable source of Electronic Product Design Ideas. Study the Applications.

    Folkscanomy Electronics: Books on Electronics, Circuits and Processors 

    You will also find Radio Electronics and many other Datasheets. Even of firms that do not exist now.
    Datasheets and IC Application Notes

    One of the books here is The " Intersil Hot Ideas" - This was my Mentor Book These helped me build Intelligent Instruments in the 80s. Intersil( GE) was in advanced CMOS before anybody else. They made the smartest chips when the Microprocessors were being examined Skeptically by engineers. (At that time Microprocessors needed many support chips and consumed huge power only later CMOS uC came)

    See also delabs Resources i have created as a reference for such doubts (2007)