I hope to join the Coral Reef project, but we are waiting on an update from St. Monica’s. Hopefully once Izze has a meeting we can figure out where to go from here and I can officially sign on.
Izze S. (24′) and I are trying to use the Arduino to design a thermistor circuit to be used as a temperature probe. We ran a test to find out it’s an NTC thermistor, and a test to run code to blink an LED. From here have to hook up the thermistor to the Arduino. We have a meeting with St. Monica’s tomorrow to figure out where to take the project from here.
We met with St Monica’s for the first time after summer today. Izze and I need to finish setting up the temperature probe and thermistor within the next week-ish to deliver to MORI next week/beginning of the week after.
Joe set up the voltage sensor to input graph points to the Pasco while the temperature sensor measures in a different column. We’ve set up a hot plate to boil the water and get the highest point at 100º Celcius, then set up an ice bucket on a stirring plate to put the boiling water beaker in to lower the temperature and measure points along the way. The Pasco graph measures points every minute. Once all our data is collected, we need to do a curve fitting and create an equation from voltage to temperature.
This week Izze and I have created the voltage to temperature equation as well as the voltage to DS (digital signal) equation. We’re working on coding the Arduino to read out in temperature instead of the current numbers in the serial monitor. We have a readout that’s in temperature format, but isn’t accurate to the climate it should be reading from. We’re changing the Arduino code to try to fix this.
Last week we fixed the Arduino’s code and it now gives a comprehensive temperature readout in degrees Celcius. I have to package the circuit and send the code to MORI probably within the next week or two. We’re also working towards finishing the RoCCS poster for the Fall poster session. The ceramic printer will be back up and running for the first time since summer this week, and I cut and packaged some clay to fill it with today. We should be able to run a test Wednesday.
Today we had the Fall poster session. We met the MORI group in person for the first time and each delivered our presentations together. The clay printer had some issues but otherwise everything went smoothly and we’re moving on to packaging the probe for delivery.
After cutting, stripping, and soldering all the wires in order onto the breadboard, I moved on to solder and shrink wrap the thermistor pins. This went smoothly and I plugged the Arduino into the Rasberry Pi. I can now access the temperature readout from the VNC Viewer, at home or from WISRD.
After trying to cut a section from the breadboard with a hacksaw and the Glowforge, I decided our best option was to have Chance cut it on the CNC. He finished cutting the small section today and from there I met with Wills to design a box to hold our probe for delivery to MORI. Wills will be making a spacer so I can determine where to place the board on the Arduino and how short my wires can be, and from there I’ll re-solder all the wires on.
Since we’ve been back, I’ve been working collaboratively with Wills while he works on a design prototype to hold our circuit for delivery to MORI. We’ve had two prints so far and are incorporating feedback to create the final product. Once the print is successful and we’ve changed what needs to be changed, I’m going to re-solder the wires and arrange everything in our box. After the final design is printed, I can finally get the temperature probe to the tank at MORI for use.
Over the past couple weeks a lot of progress has been made. We’ve gone through many models of the box to hold the Arduino as well as re-soldering the wires and testing the code twice. As of now, the soldering is finalized and the code is working. The last things to do before delivery are re-print a model of the top of the box to hold the thicker wires and figure out a way to hold the thermistor in the tank. I reached out to Luca with questions about the tank, so I should be able to figure out a way to implement a wood beam to hold it over the tank. Once Wills’ print is done and I have a support beam, the probe will be ready for delivery/pickup to MORI. Toby also reached out asking about printing a new clay model Luca had designed, so after the probe is delivered I’ll start re-setting up the printer.
Wills finished the final top for the Arduino and I got the dimensions of the tank from Luca, so the last thing to do before dropoff is cut a piece of wood to hang the thermistor over the tank. I was asked to be interviewed for the WISRD podcast, so I spent today filling out the questions Ian sent.
Today I had Jackson cut a hole in the block of wood that’s going to hold the thermistor over the tank. The final steps are to find a clamp for the wire and drop the probe off at MORI with Joe. The interview might take place on Thursday.
I helped Honor and Canada run tests with the EMOTIV today in the library and set up my test profile. I also did the interview with Ian after school for the podcast, which went quite well and he offered to nominate me for the board next year.
We found out the copper in the brass thermowell of the thermistor is toxic to coral in certain volumes, so I have to wait for the new stainless steel probe to come to re-calibrate it and set everything up all over again. This is a big setback, but hopefully the calibration won’t take as long as it did last time. We finally figured out the issues with the Cura on the Recon laptop and Joe did the first print since poster night.
We’re currently trying to re-calibrate the new thermistor. The probes are conducting heat differently so we have a different curve when measuring temperature going up vs going down. Brass conducts heat better than steel, so the temperature is hitting the steel probe slower than the previous brass probe. The temperature probe it’s being measured against is giving readouts much quicker than the thermistor, which makes the data inaccurate. The new experiment needs to consist of bringing the water to a specific constant temperature, waiting, measuring the temperature/voltage, then doing it again for multiple other points. I’ve also done a couple of new prints with the new files, the first came out well and the second failed. Poster presentations are also semi-soon, so we need to start the outline of ours or think about what it would look like to write a whitepaper instead.
The new thermistor has (hopefully) been calibrated correctly and I did one of the most successful clay prints I’ve done. The poster presentation is coming up soon, and because St. Monica’s has different spring break scheduling to rehearse is becoming difficult. We don’t have a poster outline yet because I’ve been working so we have to start soon. Today I’m going to de-solder the breadboard and try to work on getting it onto the new thermistor.
The new thermistor was set up fully (aside from a missing screw), and last Wednesday I dropped it off at MORI with Joe and Megan. It was my first time in their labs so Luca gave me a tour of the tanks and lab. The thermistor successfully read the temperature in Celcius, and I can now VNC in to see their readings. The WISRD board retreat was yesterday as well, and I was officially elected to the board. I will be running for Program Director in the coming weeks. Currently, Izze is working to calibrate the pH sensor and all my effort is going into the poster for Spring poster presentations.
Our Spring poster session was Monday the 26th and I set up the clay printer to run for it. It worked for half of the print then had a motor overload so it didn’t complete the print but otherwise things went smoothly. Yesterday I fixed the overloaded motor with Joe and let a print run while I was out of class. It seems to have gone fine but has some cracks and is not a viable print to drop off at MORI.
I finished taking apart the printer and the final print that I did I don’t think will be viable to be dropped off at MORI. It had a lot of cracks that I patched and cracked again, and I don’t think drying it with wet paper towels worked as well as with a rag. I’m finishing up my vitae in the last four weeks and Izze and I need to brainstorm where we want this project to go next year, as our role has shifted from ceramics to more technical aspects and probe building.
Everything ceramics-wise and probe-wise has wound down, so I’m working on writing a whitepaper about our thermistor setup procedure. It’s been through one round of edits from Joe and Megan and needs some more along with adding photos. I have four more WISRD periods before the end of the year, so I’d like to finish the paper in that time in case other work comes up over the summer. Joe and Luca are building a mechanized machine over the summer to insert and remove the probes from the saltwater. The temperature probe is supposedly having some issues giving a readout, but I haven’t had any luck accessing VNC to see what the issue is.
Today is my final WISRD period of the year. I finished looking over my thermistor whitepaper, and am waiting for final edits from Joe. I think I’ll miss the publication deadline in this journal, but it can always be submitted in the future. Joe’s retirement party was today as well and we gave him the guardian bells and notes.