EK Technologies

Integration of Embedded Capacitors and Resistors in Multi-Layer Printed Circuit Board (PCB) Olome Baudouin Ekute  EEF714: PCB DESIGN AND FABRICATION Faculty of Engineering and Technology, University of Buea   I.                    I. Introduction The rapid development and high demands for more efficient, miniature electronic devices as well as increases reliability, have led researchers to develop new technologies in manufacturing printed circuit boards. In 1956 the first PCB was patent in the US which began with a single side on the PCB, then later the double sided PCB was developed forming connections between the components using the surface mount technology and the hole technology   [1] . Due to high functional demand, the multi-layer printed circuit board was developed with smaller component sizes. In order to achieve this, passive components like capacitors and resistors whi...

Interfacing LM35 temperature sensor with PIC microcontroller An LM35 temperature sensor senses the temperature and produces Analog signals which is fed to a microcontroller which interprets the result. The microcontroller used here contains an Analog to Digital Converter (ADC) which receives the signals from the LM35 and produces a corresponding digital signal and the value of the temperature displayed on an LCD. Application: Room temperature control Egg incubator Dryers e.g. cocoa dryers, Green agriculture, etc. Materials: An LM35 A PIC 16F877A Two relays 2 transistors BC549 2 protective diodes (fly-back diodes) A Fan A heater A 16x2 LCD Supply DC 5/12V, AC 230V Circuit diagram of LM35 temperature sensor interface with microcontroller The circuitry is shown below Operation Lets control the temperature such that if the temperature is less than 25 degree Celsius, the heater is put ON and the fan OFF. If the temperature is about 25 degree Celsius, the...