Bascom and AVR, Morse code sender with OLED and Avago (formerly Agilent) HDSP-R881 display
Generating morse code has been explained in the
sound chapter. Here, an extra 'gimmick' is added by using an
8x8x3 led display.
This display is used in the program to display a single character as it is sent to both
the LCD and the loudspeaker. Make sure you read the complete datasheet before using a HDSP-R881 display.
I used only the blue and green leds from this display. The blue and green led cathode columns are switched by
eight-bit I2C I/O extenders. Note that the TI PCF8574A I2C addresses differ from the Philips PCF8574!
The anode led rows are switched directly by the ATMega8. The switching is done in a timed interrupt.
The morse code is produced with the the Bascom 'sound' command. As it is often interrupted, it sounds rather
I used an OLED 16x2 display for the first time. It is really great! Much better contrast than backlit LCD's.
See the morse code sender
. (poor quality, 0.5MB AVI, highly compressed, I apologise for the creaking chair...)
Have a look at the
and have fun!