USB-SERIAL WITH ATLAS SCIENTIFIC EZO SENSORS

About: Atlas Scientific is on a mission to convert devices that were originally designed to be used by humans into devices that are specifically designed to be used by robots. We isolate the core functionality of h...

This tutorial shows how to use the Isolated USB EZO Carrier Board to interact with EZO circuits. With a few simple steps, you will be able to calibrate and debug circuits or even monitor in real time the parameter in question.

ADVANTAGES:

  • Works with EZO circuits: pH, EC, DO, ORP, RTD, FLOW
  • No wiring required
  • No programming needed
  • Offers isolation which protects circuits from electrical interference
  • Onboard BNC connector for probe
  • No microcontroller needed

MATERIALS:

Supplies:

Step 1: ASSEMBLE HARDWARE

  1. Ensure that the EZO circuit is in UART mode. Note: I2C mode will not work for this. For more information on how to change from I2C to UART, refer to this link.
  2. Insert the circuit into the Isolated USB EZO Carrier Board. Be sure to match the pins correctly. The carrier board's pins are labeled for convenience.
  3. Attach the probe to the BNC connector.

Step 2: INSTALL EMULATOR AND CONFIGURE THE SETTINGS

The emulator used is Termite downloadable here. It is a free RS232 terminal for Windows OS, where commands can be entered and the circuit responses can be viewed.

  1. After you have installed the emulator on your computer, launch it.
  2. Plug the USB-A end of the cable into your computer's USB port while the USB mini-B end goes to the carrier board. Your device should now be powered on.
  3. In termite, click on the "Settings" tab, a new window called "Serial port settings" will be opened.
  4. In "Serial port settings", make the changes in accordance with Fig1. Click on the "ok" tab when finished. Note: The port should be automatically detected once the USB is plugged into the computer. In this demo, port = COM13. The baud rate is set to 9600 as it is the default of the EZO circuits.

Step 3: INTERACT WITH YOUR EZO CIRCUITS

Refer to the specific datasheet of your circuit for the list of appropriate commands. Datasheets are on the Atlas Scientific website.

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