Tentacle Shield for Arduino

Rated 5.00 out of 5 based on 3 customer ratings
(4 customer reviews)

$ 102.32$ 112.55

An arduino shield to host and individually isolate up to 4 sensor circuits from Atlas Scientific to measure PH, Dissolved Oxygen, Electric Conductivity (E.C.) and Oxidation-Reduction Potential (ORP).

Please select:

  • kit: The Arduino pin headers are included, but not soldered. You can solder the included headers or use your custom connectors
  • assembled: the Tentacle ships fully assembled and ready to use
SKU: T1 Category:


Tentacle is an Arduino shield to host up to 4 sensor circuits from Atlas Scientific to measure PH, Dissolved Oxygen, Electric Conductivity (E.C.) and Oxidation-Reduction Potential (ORP) and temperature (RTD). The sensor circuits are not included. Works with current and all previous versions of these Atlas Scientific sensor circuits: PH, EC, DO, ORP, RTD

Easy Setup

Use the setup sketch to easily set up your circuits interactively. It even comes with circuit auto-detection!


The Tentacle shield is COMPATIBLE with all 5V-tolerant Arduinos (Uno, Mega, Yun, & many more). However, the Tentacle shield is NOT COMPATIBLE with Arduinos that can’t tolerate 5V on their I/O pins (Zero, Due, etc). If you need 3.3V compatibility, the Tentacle Mini is for you.

  • stack 2 shields to get 8 isolated sensor channels
  • I2C and UART compatible


Individually isolated measurement circuits and communication lines prevent noise and ground loops for precise measurements even in closed-loop systems. Read our blog post Atlas circuit isolation, noise & crosstalk tests for more details on the isolation of sensor circuits.

Mix and match legacy and new EZOTM sensor circuits

Compatible with all versions of sensor circuits by Atlas Scientific. Freely combine different types of sensors. For example use 4x PH or 2x PH and 2x E.C. or any combination of PH, dissolved oxygen, E.C., ORP, temperature that fits your needs.

With the on-board serial multiplexer you can use up to 4 serial sensor circuits (or EZOTM in serial mode) per shield using just 4 pins of your Arduino. Stack two tentacles to get 8 serial channels.

Arduino-style simplicity

Extra long pin headers to stack multiple tentacle (or other) shields on your Arduino hassle-free. On-Board reset-button to reset your Arduino without removing shields. Includes a mounting kit with plastic standoffs.

Get Started

Example Code


The Tentacle shield is certified Open Source Hardware (OSHW). Certification number is CH000003. Its schematic and pcb layout are licensed under Creative Commons Attribution-ShareAlike 4.0 International. The CAD sources are available. View on GitHub.

Additional information

Weight 0.130 kg
Dimensions 15.5 x 9 x 3.8 cm
Shield headers

assembled, kit


Whitebox Labs

Open Source


4 reviews for Tentacle Shield for Arduino

  1. Rated 5 out of 5

    Eric Burger

    Great Shield! Very easy to use and to customize to a project. Also, the whitebox example code is really good. I wouldn’t recommend getting any of the sensors without also getting this shield. The readings from my pH sensor were useless until I added the tentacle shield.

  2. Ferry (verified owner)

    Great shield. Even for me as a starter in electronics and programming!

  3. Rated 5 out of 5

    Tarik Chrigui (verified owner)

    Great shield, Perfect Customer Service arrived on time. Thank you.

  4. Rated 5 out of 5

    Anthony Genovese

    So easy to work with! Awesome product!

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