The Thermometer  (AQI BOARD)

Play "Young and Beautiful" by "Lana Del Ray" to see this post.

Getting a 110mm glass piece is STILL not easy. Goddamn. So I ended up making it 125mm again.

Youtube video of the real thing: Soon will be uploaded

This project is on Instagram highlights by "\ t.l_AQI /" on @ro_h_bots

So how about we find out what's the temperature of my room in the MOST GLORIOUS way. It even HAS a Dew Point Indicator, Just so you knows THIS IS THE MOST BEAUTIFUL THERMOMETER EVER MADE. 

Below the CAD will do the talking. I have included a 3D interactive assembly of the entire thing. There's exploded views and working animations of the entire thing as well! I love this system so much oh my god, you have no idea.

This one was made to look extraordinarily beautiful in my room on a board which will house:

• Hygrometer
• Thermometer
• AQI Meter
• VOC Meter

It took me 264 hours of effort time to perfect and go through 3 drafts to make sure this will remain as the most glorious themometer of this age!

Tick 1 Tick 2 Both Ticks

An Interactive 3D View of The Full System Assembly 

The Mechanism

Here's the 3D model of it below. There's a working animation of it as well, with both tick 1 and tick 2 engaged, as well as with just one tick engaged.

So here, tick 1 (the brass rod) represents the dew point temperature, and tick 2 (the planetary gear system, in white) indicates the current temperature of the room.

The mechanism was made in a way that made sure both the ticks are powered by N20 motors, with the focus on the presentation of the planetary gear set for aesthetic purposes. Also, the internal mechanism was made in a way that made sure both ticks could be polled mechanically with absolute encoders. One last thing acted as the highest priority constraint: it was the motor shaft gear visibility and its symmetry in the face. That was the main problem to solve when designing this gear set.

Tick 1: The tick 1 system is simple—one N20 motor driving a helical gear in cross with itself. The helical gear is attached to a 22-tooth spur gear, which is driving another 22-tooth spur gear. Why? To make sure I can poll the 57-tooth helical gear in 1:1 motion to the tick to poll the position via an absolute encoder. The tick itself is attached to the 22-tooth spur gear.

Tick 2: Kind of complicated. It's a basic planetary gear set which is being driven by the ring and producing the output on the ring gear. So 1:1? Well, kind of, but no. The ring itself has a helical gear attached to it on the outer circumference, which is being driven by a crossed helical gear on an N20. The planet output is then adjusted using a spur gear set for 1:1 absolute encoder positioning.

Both Ticks Engaged Mechanism

The Housing - Body

Pretty simple. Two-part design. Top and Bottom housing. Just that. Top housing houses a bunch of bearings and the motor itself using a tad bit of friction. The bottom housing houses the magnets and electronics. In the top housing, the nuts are embedded during the printing.

Below, there are the interactive 3D models for developing further understanding. I included both empty and filled versions.

The Top Housing

The Electronics

The mainboard was made by me, and the dev board I used for the ESP32-C3 unit was made by Seeed Studio. Here's the model of it for developing understanding, and there's a schematic at the end of this page for you to see how the entire thing connects.

So the mainboard has the exact placements for the AS5600 magnetic encoders for the two ticks. The driver/motor I used for this project was a DRV8833. I made reverse connection and ESD protection systems in place to protect the connectors from outside interference. The I2C is multiplexed by a PCA9546a to handle all the I2C devices. 

I used this combination of components because I had all of them lying around and didn't have much funds to buy specific stuff.

I am very proud of this board since I had so many constraints to work with, including financial, but it just worked at the end and looks absolutely beautiful!

The Main Board

The Manufacturing

This device is relatively easier to manufacture than the hygrometer. 3D all the parts normally except the top housing. 

You need use the Sharpie Technique to make sure the supports make the interfacing layer very very flat.

Nothing much noteworthy except the top housing. 

That's it! I hope you liked the designs, and don't forget to comment below if you have something to say about this device.

Have a nice day

-Rohit 

Made in Rudra, India by RolandThsive

I Love it

The Main Board Schematic (Click to enlarge)