Hello,
I'm working on interfacing a Teros 12 sensor (SDI-12 protocol) with an Arduino Nano and considering adding an ESP module for remote data monitoring. The sensor operates at 12V, while the Arduino Nano operates at 5V. I am contemplating whether a voltage level shifter is necessary for this setup.
1 Is voltage level shifter required to safely interface these components?
2. Any specific recommendations for integrating these different voltage levels?
3. Would appreciate any tips or experiences with similar setups.
Thanks in advance for your insights!
The data sheet shows the interface voltages are all compatible with a 5 volt Arduino. Why are you asking about 12 volts?
A logic level shifter is required when interface two devices operating at different logic level voltages.
However, many industrial sensors have "open collector" or "open drain" outputs that do not impose an output voltage signal. Instead they act as an active ground connection, and can be interfaced with any input using pullup resistors to the appropriate logic HIGH voltage.
"SDI-12 sensors require 12 VDC power. Typically, this power is supplied by the data logger Power out 12V terminal." -from Campbell Scientific. Since I'm using a Arduino Nano or Mega it can provide 5V only so I'm confused on whether I can integrate it without a logic level shifter or not. If you could provide any resources since I'm new to this it'll be really helpful. Thank you.
Quit worrying about the power to the sensor. Worry about what is connected to the Arduino. They are 5 volt compatible signals, as per the sensor documentation! Read the sensor specification writing.
The real question is for you! What connections do you want to make?