Sensor TDS Gravity hace que aumenten las lecturas de pH

[Surbyte]

El DS18B20 consume muy poco asi que puedes alimentarlo con un PIN del Arduino sin problemas.
Para el TDS aca tienes algo que te puede servir

P-channel MOSFET sanity check

I'm a newbie (so go easy on me) designing a Pro Mini shield for housing and controlling several modules (GPS, etc.). Modules are 3.3v and <50mA and powered from the Arduino VCC. I'm using a logic level P-channel MOSFET to switch the modules on/off high side via Arduino pins. The NX2301P seems a suitable option, I think. A schematic of my circuit is attached. Questions: Do I have this generally correct? Are the resistor values suitable? All I know is that the pull-up resistor should be a h…

Si no encuentras el PMOS busca uno similar.