Ceramic resonators are a practical, compact, and reliable alternative to standard crystal caps combinations.
Add-on kit, specifically for the AXE033 Serial/I2C LCD and clock module
The I2C-RTC board is a 6-pin CMOS Real-time Clock device using I2C bus. There are no external components required.
The PICAXE is a great chip, but the programming interface is a bit bizarre, using a 1/8" stereo jack. Last time we looked, breadboards didn't have stereo jacks... Good thing these adapters are available!