Saturday, September 22, 2012
Sunday, May 27, 2012
LCD PIC Clock with the Maxim DS1307 RTC
Giorgos Lazaridis writes:
A friend of mine asked me to design a home automation for him. He wants me to build something that will communicate with his air condition through an IR receiver that it has, and it will act as a programmable timer, to turn it on and off automatically. This circuit will help you understand how to use the built-in I2C communication module of PIC microcontrollers, and also how to use the Maxim DS1307 Real Time Clock chip.
LCD PIC Clock with the Maxim DS1307 RTC - [Link]
PWM 3-Wires Fan Controller with RPM feedback (Pulse Stretching Method)
Giorgos Lazaridis writes:
Using a potentiometer, i control the speed of a PC fan, from 350rpm up to it's max speed (1300 rpm). The fan is a 3-wire PC fan. Using the Pulse-Stretching method, i get accurate RPM feedback, twice a second, and display them on an LCD display.
PWM 3-Wires Fan Controller with RPM feedback - [Link]
Voltage Controlled PWM Generator
Giorgos Lazaridis writes:
From time to time, i have use many circuits that generates PWM pulses. Most of them will translate a resistor value into duty cycle change. Although that is handy and easy, sometimes a voltage controlled PWM generator is needed. There are of course those micro-controllers that could make almost any kind of PWM signal translation, but i preferred to study and create a circuit without the use of such chips. I tried to keep it as easy as can be, but without this reflecting to the accuracy and integrity of the output pulses.
Voltage Controlled PWM Generator - [Link]
Removing the built-in thermostat of an aquarium heater
Giorgos Lazaridis writes:
I just got a 100 Watts submersible aquarium heater from ebay! No, i don't have a fish aquarium in my house, nor any other living creature larger than bacteria or other microorganisms. The reason that i bid on this item is because i will use it for my homemade PCB etch bath!
Removing the built-in thermostat of an aquarium heater - [Link]
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