FloDar Updates
Author: Andrew Walker
- New Lab Calibration System
Author: Andrew Walker
- Currently testing the sensors in the Lab
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I have been testing the completed board and hardware configuration for a few weeks now. We are running into some issues with both the ultrasonic flowmeter and the turbidity sensor. We are hoping that creating a lab experiment that is more reflective of the current field use will increase the accuracy of the flowmeter, but for now the sensor is reporting values far too low. When the pump is on, bubbles and turbulence form in the fluid and may be the primary cause for inaccuracies. We will not know until we test, so we are hoping to make changes quickly.
The turbidity sensor has many problems associated with it at the moment. We are hoping to address these through collaboration between other OPEnS Lab members as it is in multiple projects. For now, the sensor can only indicate qualitative differences accurately, all quantitative measurements varying from one day to another. This will be an ongoing effort and we will do out best to update you as we make progress.
Author: Andrew Walker
- Schematic for the PCB made and sent in for validation.
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I think I have finally finished a completely integrated board for the FloDar project. It is currently being critiqued by the Chet and Cara, but it was a quite fulfilling project so far. We hope to know soon if it is good enough to get printed, populated, and implemented in the testing phase. Another large step toward finishing the first prototype of the project, but still many finishing touches to go!
Author: Andrew Walker
- Machined inserts for the thermocouple and turbidity sensor.
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Hadi and Bradley worked in the OPEnS Machine Shop to created a new pipe with the turbidity and thermocouple sensors inserted and in contact with the water. Though it took two tries - the first pipe breaking due to the stress of the leveling process - the product turned out great and is ready to start testing! It has shown to be be water proof, now for accurate sensor measurements.
Author: Andrew Walker
- Created a functioning protoboard circuit for testing.
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We have been working to make a protoboard of the circuit we will be using. The breadboard was a bit difficult to handle! Hopefully we will be able to convert this board to a proper PCB soon so that we can begin working towards a final prototype.
Author: Andrew Walker
- 3D printed a holder for the transducers to easy installation process.
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Hadi has created a great print to hold our flowmeter transducers. Installing the transducers has been a pain due to the awkward curve of the pipe and easy slippage. With the new compartments the transducers will be held in place while they are strapped down and set the exact distance apart thanks to the plastic spacing between them.
Author: Andrew Walker
- Created most of the bread board circuit necessary to power all components and transmit them to the ADS1115.
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We are working on completing the necessary circuitry for the FloDar computing. So far we have implemented a 150Ohm resistor to convert the current analog from the flowmeter to voltage, implemented a voltage divider to step down the 5V from the turbidity sensor to 3V, and sending both signals to a 16 bit ADC for more accurate measurements.