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. 2021 Dec 7;21(24):8179. doi: 10.3390/s21248179

Table 4.

Pin assignment of ESP32 Wi-Fi module for proposed multi-sensor system.

Pin No. Pin Function Function Remark
3 GPIO36 (ADC0) pH reading Input only
4 GPIO39 (ADC3) DO reading Input only
5 GPIO34 (ADC6) EC reading Input only
6 GPIO35 (ADC7) Temperature reading Input only
14 GND Ground
19 5 VDC Power supply