Digital Temperature Meter using PIC16F688

A digital temperature meter based on PIC16F688 microchip and DS1820 temperature sensor that displays temperature on Celsius and Fahrenheit scales.

Very cool project, firmware written in mikroC compiler.

Read

40x7 Running Message Display using PIC Microcontroller

LED matrix message displays are really cool. Here is one based on PIC microcontroller that displays time, calendar, temperatures, and, text messages. It can store for up to 10 messages, each 250 characters long, and supports both static and running messages. Message selection can be done through an IR remote control. The brain of this device is a PIC18F252 microcontroller and uses 16-bit serial-in-parallel-out shift registers to drive the LED columns. It operates with 12-24 V DC power supply.

Read

Serial LCD Driver using 74HC595 Shift Register

HD44780 based character LCD displays are very popular among hobbyists. They are easy to interface with microcontrollers and most of the present day high-level compilers have in-built routines for them. However, the bad part is at least 6 I/O pins of microcontroller are required to use them in your project. Therefore, they are not applicable for 8-pin devices like PIC12F series microchips. The aim of this project is to allow LCD interfacing to such devices using 3-wires. I am going to demonstrate this with PIC12F683 microcontroller. The character data or command from the microcontroller will be transferred serially to an 8-bit serial-in parallel-out shift register (74HC595), and the parallel output will be fed to the LCD driver pins.

Read rest of the project.

Frequency Counter Using PIC12F683

The Timer1 module inside PIC12F683 is a 16-bit timer/counter. If used as an asynchronous counter, this module can be used for counting the frequency of an external clock source applied to its GP5/T1CKI port. The following example is a 0-65535 Hz frequency counter using Timer1 module of PIC12F683. The Timer1 module is reset first and then turned ON for 1 sec to count the clock pulses arrived at its T1CKI port during that period. The number of pulses arrived in  second is frequency itself. The measured frequency value is sent to PC through serial port and displayed on a hyperterminal receiver window. If the external clock frequency is over 65535 Hz, Timer1 overflows and an interrupt is generated. In case of the overflow, "Frequency out of range " message is displayed on the window. A 555 Timer IC running as an astable multivibrator is used as the external clock source.

 Read rest of the project here.

Gas Sensor Using PIC16F84A

Here's a gas sensor circuit based on PIC16F84A and GH-312 sensor. GH-312 is able to sense gases like smoke, liquefied gas, butane and propane, Methane, alcohol, hydrogen, etc. Once it senses any of these gases, it triggers the microcontroller, which in turn switches on a buzzer and flash a LED.

Read rest of the project.