All posts in the 'RS232 related' Category
Posted on 19 May 2008
This digital thermometer was built by using the temperature sensor LM35DZ, PIC16F877 microcontroller and MAX232 IC. Temperature measurements can also be viewed on a computer program which can monitor the state of COM ports of a PC. Sample measurement data received through COM2 is being viewed on the SERIAL WATCHER program which is distributed freely on the internet.[more]
Posted on 19 May 2008
This is a small ajustable clock, It’s made based on PIC16F84A microchip.The hardware part is very simple because it only uses 74hct238 demultiplexer, 4×7 segments, and some rezistors. The software part is programmed through a device connected to serial port with icprog and made/debuged with MPlab.[more]
Posted on 11 May 2008
The concept is : fully software controlled RS232 reception and transmission for PIC16F8x.Display of received ASCII characters sent from PC via RS232 and their corresponding decimal value on the LCD. Microcontroller sends feedback of received characters back to the terminal window. When the PIC terminal is idle, it sends a status message ‘@’ to the PC every 2.75 seconds.[more]
Posted on 17 Apr 2008
This is a Physical Hit Counter V2 designed by Bob carret. Bob writes:There is nothing more in this version except, I use MAX7219 and 7-segment common cathode LED display x 8 instead using mechanical counter like the early version. MAX7219 is a 8-Digit LED Display Drivers and serially interfaced.I use MAX7219 because I got two samples from MAXIM.To interface MAX7219 with PC serial port without MCU, we must convert RS232 voltage level to TTL level.[more]
Posted on 09 Apr 2008
The PICADC is a simple 12-bit, 8-channel analog to digital converter (with 4 additional digital inputs), which may be connected to the PC through the serial interface (RS232).
The sequence of sampled channels, and sampling frequence are programmed by the PC.
The maximal sampling frequency is limited by the data transmission rate, and at 115200 baud is equal to ca. 3kHz for 1 channel without digital inputs, and to ca. 500 Hz for 8 channel with digital inputs.The analog input voltage range is -2.5V to 2.5V.The digital inputs may be used for recording additional digital signals, eg. the time code used to synchronize the recorded data with other events.The PICADC is based on PIC16F84 (or PIC16C84) microcontroller, and MAX190 (or MAX191) ADC.[more]
