RS485 communication system using PIC18F4520

Posted on 12 Nov 2008

RS485 communication system using PIC18F4520
This project is a RS-485 based bidirectional communications system using PIC18F4520 to communicate between several nodes. The project will consist of two separate circuits (per node) a) an RS-232 to 2-wire RS-485 converter and b) a 2-wire RS-485 peripheral transceiver.The converter will allow a PC serial port to be converted to and from electrical signal levels required for 2-wire RS-485 format. The RS-485 interface allows up to 32 standard load nodes on a shared data bus.[more]


Posted in : Communication related | PIC projects | RS232 related

Frequency Meter with 100 MHz RF desktop channel

Posted on 29 Apr 2008

Frequency Meter with 100 MHz RF desktop channel
This basically the frequency meter section of the frequency meter/pulse generator based on the AT90S2313 described elsewhere on this site, combined with the 100 MHz RF interface described in the page about the RS-232 to 100 MHz RF desktop channel adapter. Built and align this is the same manner as the 100 MHz RF desktop channel adapter. The frequency meter has a maximum input frequency of 4 Mhz and counts up to 65535. Time bases of 10 ms, 100 ms, 1 second, 10 seconds, and 100 seconds are selectable from the keyboard via the RF link.[more]

Posted in : AVR projects | Measurement projects | RF projects

USB LCD/VFD Controller

Posted on 20 Feb 2008

USB LCD/VFD Controller
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.Some features :this project uses a FTDI FT232BM chip as the USB bus controller,upports industry-standard LCD interface ,Configured for 16×2,20×2,20×4,40×2 LCD/VFD module,include hardware 19200-baud RS-232 input,the LCD/VFD can configured via commands.control with Microchip PIC16F873 MCU ,use 93C46 to store data.[more]

Posted in : PIC projects | USB projects

PIC16C63 Midi controlled Light dimmer

Posted on 13 Feb 2008

PIC16C63 Midi controlled Light dimmer
This is a MIDI box interface. There’s an input connector and an output connector. The boxes’ output connector goes downstream to the next boxes’ input connector. There’s a DIP switch in each box to select which of the 16 channels the box will respond to, and what device the first light will respond to. The four lights and the relay will respond to four consecutive device addresses.This design can be modified to use standard baud rates, and the RS-232 Electrical interface. Then you can just fire off commands via RS-232. Cakewalk would be a little difficult to interface to if you just wanted to make a home lighting system that responds to opening doors and time of day. For that you just wip something up in Visual basic using standard com port commands.[more]

Posted in : PIC projects

GPS Serial Communications

Posted on 05 Feb 2008

GPS Serial Communications
handheld GPS unit, that comes with a serial cable allowing you to interface it with a PC. Using a terminal program like Windows’ Hyperterminal or DOS’ Lynx, one can directly access the GPS to view the incoming geospatial message received from satellites orbiting Earth. Among other parameters, the message describes the unit’s position (longitude and latitude) and speed (if carried or transported in a vehicle). Using a terminal program to read the geospatial message isn’t very practical. The messages scroll too quickly to read well and they contain a lot of extraneous information.[more]

Posted in : GPS projects

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