Pollin DCF77 module

The DCF77 module of www.pollin.de is a cheap DCF module that is easy to connect to the arduino. The pins are VCC, GND, DATA, PON where the VCC pin is the one closest to the antenna cables. Connect VCC to 3.3V, GND to GND and DATA to analog pin A1 (so you do not need to change the code). The PON pin goes to GND and enables the module. If you want to save power, you can switch off the module using this pin, but the power consumption is so low, that is not worth the effort. In addition, after power up, it may take up to 20 minutes until the module is working correctly.