The EVAL-ADPD410x-ARDZ allows 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 ISO 7027 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 uses a network of 860 nm 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.
Pre-built hex files can be found here:
The latest source code can be found here:
To set up the optical path, use the prototype board that comes in the box with the EVAL-ADPD410x-ARDZ as a base. The connection diagram for the QED123 LED and the two QSD123 is shown below:
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.