All posts in the 'RS232 related' Category
Posted on 15 Jul 2008
When experimenting with microprocessors a serial interface with 3.3 digital voltage level is often needed. A MAX232 can be used, but often also an usb-serial interface is needed since modern computers, like the Apple iMac’s do not have a serial interface. Here is a description to get a very cheap usb-serial interface based on a cellphone USB data cable which uses the Silicon Labs CP210x single-chip USB to UART bridge. [more]
Posted on 15 Jul 2008
This small realization, based on one of the most common IC (MAX232) is designed to create a small and convenient TTL to RS232 and vice versa convertor.All you need is 4 caps, one IC and 2 connectors. If you want to add a small regulator on the board (already foreseen on the PCB) you just need to add a 78L05 regulator and a cap.[more]
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]
