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USB - LCD with PIC Microcontroller & FT232
Posted on Monday, April 19, 2010   •   Category: USB Circuts


USB LCD/VFD Controller is a HD44870 based LCD/VFD controller via USB interface. The control command is compatible with Matrix-Orbital's LCD module. So, you can use any MO friendly software to control this baby. Such as LCDC... The firmware are based on David Potter's Serial LCD/VFD Display, but I almost rewrite the entire code.


DTMF Decoder with LCD Display
Posted on Monday, April 19, 2010   •   Category: AVR


The DTMF decoder 2 is a useful tool used for decoding DTMF (Dual Tone Multi frequency) generated by telephones. The decoded digits are viewed on a 16x2 LCD screen.


USB to RS232 Converter
Posted on Monday, April 19, 2010   •   Category: USB Circuts


Why build my own USB to RS232 converter when there are adapters already available from many suppler? The Answer is simple: Neither the strand "USB to RS232 converter" actually worked *properly* with all the devices I tried. But, They did not seem to support ALL the RS232 lines. The USB to RS232 converter using the FT8U232AM and a Maxim-IC MAX235


Ethernet Weather Station
Posted on Friday, April 16, 2010   •   Category: PC Circuits


Using an add-on card to the already existing avr ethernet board we build a weather station. That is: A weather station with a build-in webserver. My original plan was to have sensors for temperature, air pressure and wind. I started a prototype and it worked very well except for the wind measurement part. I plan to improve the wind measurement hardware and add it at a later point in time.


1.5V to 5V Converter
Posted on Friday, April 16, 2010   •   Category: LED


In many cases can be very handy to be able to convert 1.5V to 5V. Then you can power microcontroller or LED from a single AA or AAA battery. It is simple to do this as there are special ICís as MAXIM MAX1674 or MAX7176. This is step-up DC-DC converter that can convert voltages from 0.7V to any in range from 2V to 5.5V. MAX1676 have already preset pins for 3.3V and 5V, that makes easer integration in 3.3 and 5V circuits. IC can dissipate up to 444mW. Bellow is a circuit that converts 1.5V to 5V.


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