ESP8266 project to emulate a "motherclock" as used in earlier times in plants and trainstations
The old clocks can not be simply powered using voltage - they require a impulse each minute with changing polarity.
- "Mutteruhr"
The author here shows to how generate positive and negative voltage out of a MAX232 to drive a clock. - RTCLib
Provided function to communicate with a PCF8583, was light adjusted to make it more useable for my purpose
- ntp howto
- Information for PCF8583
- nodemcu tutorial
- Tipps for the ESP87266
- 9b-esp8266-low_power_solutions_en.pdf