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Animated Christmas Star
Posted on Monday, December 27, 2010   •   Category: Miscellaneous


The star is about 35cm across and designed to be displayed indoors in a window. I originally created the star three years ago using a 16F872 controller. The original version worked ok - but had no spare memory for adding more features. This new version uses a 18F2620 because I now prefer the 18F series and decided it would be a good general purpose 28 pin chip to use. It has more than enough memory (64K) so I can add as many features as I want now. (It should also work using a PIC18F2525 instead if you find it easier or cheaper to obtain) Since, I made the first version, brighter LEDs are now available and cost is much lower - this project currently uses a total of 60 comprising of 25 Blue, 15 Green and 20 Red.


DS18B20 Bluetooth Thermometer
Posted on Friday, December 17, 2010   •   Category: PIC


One morning I woke up and wanted to know what the temperature outside was, and instead of running over to Home Depot and picking up a $2.00 glass thermometer, I decided to build my own wireless temperature sensor. At the heart of the board is a PIC12F675 microcontroller in an SO8 package. The right-hand side of the board houses the linear power supply (LP2950), bottom-center is the DS18B20 1-Wire temperature sensor, and out in left-field you can see the Sure TTL Bluetooth Module.


MCP9700, MCP9700A, MCP9701 and MCP9701A Temperature Sensors
Posted on Friday, December 17, 2010   •   Category: Sensors


The MCP9700, MCP9700A, MCP9701 and MCP9701A Temperature Sensors from Microchip offer exceptional performance for the low price. Each have different temperature ratings and accuracy parameters. MCP9700, MCP9700A, MCP9701 and MCP9701A sensors are available in different packaging and are very simple to interface with. Vdd, GND and Vout are all that are required. You should check the datasheet to get a better idea of the parameters for the device you decide to use, though keep in mind that the user module listed below will automatically calculate the temperature depending on the device in use.


AC Power Meter
Posted on Wednesday, December 15, 2010   •   Category: Miscellaneous


If you attempt to save power in the house thoroughly, you can not ignore the standby power consumption of appliances. We made a device to measure the power consumption of appliances. Actually, to say the AC power meters measure the 100V AC current is flowing in the power cord over do it. In general, the voltage is measured casually, is difficult to measure the current. To cut off a part of the circuit current flow from a current meter must be connected to it.


PIC18F2550 Project Board
Posted on Wednesday, December 15, 2010   •   Category: PIC


The new PIC18F2550 Project Board was designed as the development platform for student projects. The board platform is suitable for developing the microcontroller based instrumentation. Students may build the signal conditioning board, plugs it to PIC project board, develops the code and programs it with loader cable easily.


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