Hackaday1 年
ESP32 Keeps Track Of Hot Tub’s Vital Signs
An ESP32 reads the sensors and sends out the ... As with many chemical sensors, the pH and ORP probes gradually lose their active material and need to be replaced after about a year.
Hackaday1 年
pH sensor
An ESP32 reads the sensors and sends out the ... As with many chemical sensors, the pH and ORP probes gradually lose their active material and need to be replaced after about a year.