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The EVAL-ADPD410x-ARDZ allow users to take advantage of the flexibility of the ADPD4100 and ADPD4101 as multimodal sensor front ends to a wide range of applications. One example of a specialized application is the CN0409, a reference design for turbidity measurement. This demonstration shows how to measure turbidity using a similar method but using the EVAL-ADPD410x-ARDZ.
The International Organization for Standardization (ISO) developed a design standard known as ISO7027 Water Quality—Determination of Turbidity, which is best known for its requirement of a monochromatic light source. Most instruments that comply with this standard use an 860 nm LED light source and a primary detector at an angle of 90°. Additional detection angles are allowed, such as a detector at an angle of 180°, to increase the range of measurable turbidity levels.
The demo will use a network of 860nm Infrared emitters and silicon PIN photodiodes to achieve a water turbidity measurement system. The system can measure low to high water turbidity levels ranging from 0 FTU to 1000 FTU.
The following is a list of items needed to replicate this demo:
Configure the onboard jumper header and solder jumper connections, as shown below.
|Shorted Pin 2 and Pin 3
|Shorted Pin 1 and 2
Set the following EVAL-ADICUP3029 switches according to their configuration on the table below.
Connect the EVAL-ADPD4100-ARDZ or EVAL-ADPD4101-ARDZ to the EVAL-ADICUP3029 using the headers shown below.
Connect the EVAL-ADICUP3029 to the PC using the micro-USB to USB cable. Drag and drop the appropriate .hex file from the list below to the Daplink Drive. (See driver-/-firmware-setup)
Pre-built hex files can be found here:
The latest source code can be found here:
To setup the optical path, use the prototype board that comes in the box with the EVAL-ADPD4100-ARDZ or EVAL-ADPD4101-ARDZ as a base. The connection diagram for the QED123 LED and the 2 QSD123 is shown below:
To connect to the EVAL-ADPD410X-ARDZ, solder the 2 18-pin single row female headers at the bottom sides of the prototype board. Solder the 4 6-pin female headers enclosing a 5 x 5 pad space as a DIY cuvette holder. Solder the LEDs and photodiodes at 3 adjacent sides of the cuvette holder and directed inward. A photo of a completed test board setup mounted on the EVAL-ADPD410X-ARDZ and the EVAL-ADICUP3029 is shown below using Female-to-Female headers for connection.
You can place a sample placed in a cuvette to the square space at the center as shown below.
This demo uses a PyADI-IIO example script. See Software Setup for the complete installation instructions from libiio to pyadi-iio.