All posts in the 'RS232 related' Category
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]
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]
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]
ICSP, as the name suggests, allows programming of a PIC โin circuitโ, avoiding the need to constantly take it in and out of the programmer and the subsequent bending of pins. This programmer works with any standard serial port (1) and successfully programs PIC16F628ย� in HVP (high voltage programming) mode that givingย�an extra pin on PORTB - which is handy. As with the LVP programmer, it draws power for the PICโs main supply voltage (Vdd) from a USB port.[more]
The Digital QRP BreadBoard is an evolving homebrew project being designed and presented in this column, serving as a general purpose QRP accessory that can be used on the operating bench and in the radio shack in a variety of ways. Approximately 6″ x 9″ x 1.5″ in size, this project contains a number of peripherals that QRPers find useful in applications around the shack โ an LCD, shaft encoder, DDS chip, audio amplifier, RS-232C serial port, general purpose I/O buffers, and a daughterboard expansion port all provide convenient design flexibility. [more]
