RAK2560 alternatives for water potential sensors

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I purchased six RAK2560 modules to connect Meter Teros22 water potential sensors to my LoRaWAN. My order, #PX2FXE1VC, confirmed on 8-July-2026, has not yet arrived. I am at a point in my project where I need to seek an alternative LoRaWAN transmitter to integrate my water potential sensors. Is there a comparable RAK module that has availability while I await arrival (unknown at this time) of my RAK2560 order? (My gateway is US915 tied to TTN and download to an Ubuntu LTS server. The TEROS22 water potential sensors have a 3.3V interface.)

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Hi @MichaelOboy,

Iā€™m sorry that your order has not arrived and that this has delayed your project.

For assistance with the delivery status, please contact [email protected] and include your order number.

Regarding compatibility, the TEROS 22 uses SDI-12 communication and requires a 4ā€“15 V sensor supply. The RAK2560 itself does not provide a direct SDI-12 connection so a Probe IO may be required.

Although the Probe IO supports one SDI-12 device, third-party sensors that are not listed as an existing SensorHub Solution require a separate compatibility check. We therefore need to confirm that the current Probe IO configuration and firmware support the TEROS 22, including its water-potential and temperature measurements, before recommending that it be connected.

If the TEROS 22 is not supported by the current Probe IO solution, a RAK4631 US915 with a WisBlock Base Board and RAK13010 SDI-12 module could be considered as a custom development alternative. However, it would require custom sensor and LoRaWAN firmware and would not be a drop-in replacement for the RAK2560.

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Dear Sir:

Thank you for your reply. You have provided me alternatives, which I appreciate.

I will contact support about my missing delivery status. Iā€™m sure it was a filter issue with my ISP.

Also, I realize I am getting a bit impatient. Our continuing drought conditions makes my existing irrigation system either waste water through runoff or stress vegetation with insufficient watering.

The alternatives you suggest help me move forward. Thank you again.

Respectfully yours,

Michael Overeem

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