Naturally, the next step in WiFiChron's evolution was to upgrade to Atmega644P/1284P. Since there was no room on the board for the 40-pin DIP package, I settled for the SMD version.
The schematic is shown below.
Although functional, the board I designed is far from perfect:
- requires pull-up resistors for buttons; I relied on software pull-up, but that does not work in the current Sanguino library;
- requires a couple of more decoupling capacitors;
The WiFiChron-1284 board has the same dimensions as the previous revision, and it still fits in the Serpac A20 box.
I burned the bootloader using the on-board ICSP header.
Thanks again to MikeM, who contributed the software (Arduino 1.6.7 - compatible), featuring:
- proverb display;
- moon phases;
- a few new menu options for user settings;
- improved support for ESP8266;
- integrated support for GPS module.
More on the code later.