Hi Charles, Any GPS module with a 1PPS signal and NMEA sentence which outputs the amount of sattelites received should work. I think the U blox NEON7N is a good choise. I do not think you will have to change anything to the source code. Joost Breed

Hi dantop, I think that the generation of Ozon  can't be avoided by the way, I built my ion- grnarator. But you have two possibilities to avoid a lot of ozon. You can set the intensity of the electrical field strength by changing the distance of the electrodes or/and changing the value of the high voltage. My experience is to use not more than 3 kV. The distance of the electrodes depends on the "quality" of the sharp needles. Sharper elecrodes produce a higher field strength. If you smell Ozon, it is to much and could be dangerous. Many comercial ionizer are used for air cleaning. The  "Deutsche Lungenstiftung" warns against the use of Ionizer, which produce ozon, because the degrations products of nicotine and cigarette smoke is more dangerous! Ozon is a strong oxidizing agents. Best Regards Carl

Dieses Projekt zeigt, was man mit absolut minimalem Aufwand erreichen kann. Aber mit einigen zusäatzlichen Komponenten wird aus einem simplen Tester ein Prüfgräat mit erstaunlichen Fähigkeiten: https://www.mikrocontroller.net/svnbrowser/transistortester/ Was die Entwickler hier auf der Basis eines ATmega328 auf die Beine gestellt haben, sucht seinesgleichen.

WHO KNOWS WHY THE NEGATIVE ION AFFECT BAD TO THE RUBBER, LIKE DESTROY THE  DRIVE BELTS FROM THE VCR.

Negative Ion generator : Nice idea , but how not to make an ozon generator too ?(Ozon is not really good to breath...)