3D Upfitters Temp Sensor Manual de usuario

Temp Sen s or / VO C S en s or

Installation Manual 2.6

August 2022

We forgot to put something on this page.

Thank You!

We appreciate you putting your trust in 3D UPﬁtters to deliver on a new concept in 3D printing.

Yeah, it's just a touchscreen data logger, but we’ve put a lot of care, countless hours, and

money into taking something we enjoy using and making it available to everyone. !

This is a work in progress, and we welcome feedback on how to make operation and

installation as seamless as possible. We depend on customer feedback to help shape this

product's future directions.!

Installation and Conﬁguration

Power Cable

Ain't nothing gonna happen ’til you plug it in. The touchscreen comes with a USB-C to USB-A

connector. The USB-C side plugs into the bottom of the case, as shown below. We don’t provide a wall

wart as we highly recommend purchasing power strips with built-in USB power. It’s crucial that when

you start up the touchscreen, the air is clean, and no 3D prints are running. The VOC sensor will

calibrate that level of VOC as the baseline. !

Mounting the Case

Installation depends on what exactly you want to do with the touchscreen. The ﬁrst release has

two separate temperature sensors on long wires. The simplest thing is to lay the touchscreen

on the table for testing purposes and use a cable access port to bring the cables inside the

enclosure. However, the air quality VOC meter should be close to the top of the enclosure to

get a good reading. We’ve had good luck mounting the case near the top of the sides on the

left or right. !

If you purchase a 3D UPﬁtters enclosure, it will come pre-cut to place the touchscreen case at

either the top left or top right near the front.!

If you’d like to mount the touchscreen on your enclosure, the STL for a drill template is

available at the bottom of the main product page. The holes labeled S1 and S2 will enable you

to bring the sensor cables into the enclosure hidden behind the case for a cleaner look.!

Note that holes will be added to the fan controller in future versions. While we don’t like having

to drill holes, this is the least bad of the available solutions. We will make every eﬀort not to

change the holes' location; future directions force later versions to not be compatible with this

hole pattern. If you are squeamish about leaving holes in your enclosure, you’ll probably want

to wait until later versions are released in the latter half of 2022. !

Sensor Placement

Two binder clips are provided to help position the sensors inside the enclosure, or you can DIY

your solution. The VOC sensor is inside the case, which can be exposed to air inside the 3D

printer enclosure.!

Basic Operation

Temperature S e n s o r s

There are two temperature sensors. The main screen shows both of the temperature values in

Farenheight. We can add Celcius in the future if people tell us they want it, but we kept the

initial release simple in case customers wanted us to go in a diﬀerent direction.!

To view the historical time for each sensor, tap on one of the blue buttons:!

VOC Sensor Calibration

Warning: Do not place touchscreen in direct sunlight! It is designed to be used indoors.

You can calibrate outdoors as long as its in the shade.

The button in the middle is the air quality reading from the SGP30 air quality sensor board,

which measures TVOC (total volatile organic compound). Typically we see values of up to 500

ppb (parts per billion) inside an enclosure when printing ABS and half that when printing PLA

depending on the particular brand of ﬁlament. !

The VOC sensor uses a MOS (Metal Oxide Semiconductor) sensor to track VOC levels. A MOS

sensor is a small metal plate coated in various materials which allow it to attract or repel

speciﬁc types of molecules. A constant charge is applied to one side of the MOS plate, and the

resulting resistance is read on the other side. Resistance temporarily increases as molecules

bounce oﬀthe plate, and this change in resistance is logged and fed into an algorithm to

calculate the VOC parts per million.!

When you start the touchscreen for the ﬁrst time, the VOC sensor will go into calibration mode

for 12 hours and assume that the surrounding air is a clean baseline, i.e., no 3D printing, laser

cutting, or other air pollutants. Why is the ﬁrst 12-hour calibration necessary? The ﬁrst time

your device is powered on, it has no preexisting baseline, so it must ﬁnd one. Because each

sensor has atomic-level diﬀerences due to the manufacturing processes, each has a unique

baseline resistance. Running the sensor for 12 hours initially allows it to come into contact with

ordinarily occurring VOCs (and other molecules regularly found in its environment). So it will not

VOC Sensor Recalibration

Why might be recalibration necessary? Over time, as molecules bounce oﬀthe MOS plate, the

coating slowly degrades, and molecules may become 'stuck' to the plate. The molecules

gradually increase the resistance by sticking to the MOS plate, which reduces sensor accuracy.

To counteract this, recalibration is occasionally required. By recalibrating the VOC sensor, a

new baseline will be created, and all future values will be compared to that baseline and

adjusted accordingly. Recalibration should only be run while the air is as VOC-free as possible.

To recalibrate the sensor, go to the Info Page (press the 'i' in the top-right of the screen), and

then press the "Recalibrate" button - it should ﬂash green. For the next 12 hours, the main

page's VOC button will display "Calibrating."!

When should I recalibrate? We recommend recalibrating your touchscreen once every two-

three weeks; however, the device can be recalibrated at any time.!

What if power is lost? If the device is powered down during calibration, the calibration will need

to be restarted (for a total of 12 hours). If the device is powered down after an initial calibration,

it will restart with the previous baseline values.!

Note: On power up, with pre-existing baseline, it may take up to ten minutes before the

VOC sensor warms up and displays accurate values.

What readings are “good” and what are “bad”? Air quality is a big subject and requires a lot of

background knowledge, and even then is pretty complicated. When we were testing the

device, the readings didn’t make sense at ﬁrst, as the values didn’t seem to correlate to the 3D

printing process, and then we discovered the laser exhaust wasn’t working correctly. The point

here is that the 3D printer is only one source of poor indoor air quality, so keep that in mind

when interpreting the readings.!

When the sensor is in the fresh air, it typically reads about 50, so for us, that is the baseline of

“good air.” Some sources suggest that 200 ppb is acceptable, but it's unclear if that is for 24/7

or only occasional exposure. We prefer to err on the side of caution, but the important thing is

to arm yourself with actual measurements.!

Optional Cable Box

If your main use case is to use one of the sensors to measure the room temperature outside the

enclosure, then an optional sensor wire box is provided. This tidies up the exterior cable AND allows

you to mount the sensor away from the enclosure, so the radiant heat doesn’t aﬀect the reading.!

The provided screws ﬁt into the square nuts, inserted into two slots in the box. While these instructions

are decidedly terse, hopefully, the pictures will give enough information.!

Raw Data

The raw temperature data points in Fahrenheit are logged every hour to text ﬁles on the

SDCARD named “sensor1.txt” and “sensor2.txt”. To read or parse the ﬁles move the SDCARD

to your computer and view them using your favorite text editor. Temp values are logged every

hour, with T+0 (the latest values) at the bottom of the ﬁle. !

The VOC values are a bit diﬀerent. The values in the graph are capped at 200 ppb, but the

actual RAW sensor values are captured on the SDCARD. Again, refer to the documentation for

the SGP30 for more information.!

Wiﬁ/Octoprint

The values for temperature and air quality can optionally be displayed in real-time in Octoprint.

If you want to run Octoprint, that’s beyond the scope of this manual, but there are plenty of

online resources on how to hook your 3D printer to Octoprint. These instructions will focus on

connecting this device to an existing Octoprint installation.!

The ﬁrst step is conﬁguring the device for Wiﬁ by following the instructions on the touchscreen.

You’ll need to use your mobile phone, but it's pretty straightforward.!

Once Wiﬁ is conﬁgured, the next step is to conﬁgure Octoprint. The 3DUPﬁtters plugin

depends on another plugin called Plotly. Please search for this plugin and add it to the Plugin

Manager. !

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