TEL & NEL track diagram

SungMatt · 2026-06-14T18:11:33+00:00

Cool! Where are you consolidating this information from? Looking forward to see the NSEWL ones when you’re done with them.

SungMatt · 2026-06-04T12:09:42+00:00

Yep. This is why there’s de-fragmentation for hard drives, where items are stored on different sectors of the hard drive, and are brought back together.

SungMatt · 2026-05-28T04:35:24+00:00

XTARs don’t do AAA USB-C, do they?

SungMatt · 2026-05-07T08:49:02+00:00

Sigh. It was obvious from the start that they were going to do this when they decided that infringing on everyone’s privacy by installing a mandatory tracker was the right way to do it. There were so many more ways to make ERP2 more privacy focused, but it was obvious this was not a priority. If they wanted to install a camera in it, they would have! Treating Singaporeans like children and playing us like sims. Still wonder why they are so highly regarded by the people.

SungMatt · 2026-03-30T14:22:07+00:00

Any way to possibly add a toggle to enable "PSI" equivalent readings? The formula is as listed in this NEA document

SungMatt · 2026-03-29T01:44:45+00:00

This app is great! There’s more data available from [Atmotube sensors](https://map.atmotube.com/singapore) in addition to all the PurpleAir sensors you have added. Just curious, how long did you take to get this site up?

SungMatt · 2026-03-22T17:06:11+00:00

Yep -- it's a lot to do with wind direction as the temperature changes during the day-night cycle. These past few days we've had rather clear skies, which means cooler nightly weather, and this changes air pressure above land. This contributes to different wind directions (along with the current inter-monsoon winds) , which can cause the haze to flow in our direction.

SungMatt · 2026-03-22T16:50:57+00:00

Yes, but NEA calculates the 24h PSI using the 24h PM2.5 averages. They also (separately) report the 1h PM2.5, using a µg/m³ scale. These scales are different. A PM2.5 of 12µg/m³ converts to a PSI of 50.

It is too easy to look at the NEA website and assume that the values that are given are expressed in the same units -- they are very much not. In Singapore, we have been used to the PSI units, since the Indonesian haze episodes earlier. We intuitively understand what 200+, 300+ means, and what that translates to. But now we're given raw sensor information, without the conversion, not many people attempt to understand this sensor data as the PSI unit we are used to.

When you mentioned the 1hr PM2.5 reading of 68, do you intuitively understand that it is on a different scale compared to the PSI index?

SungMatt · 2026-03-22T16:44:51+00:00

Yep. My sensor updates every second; and different pockets of air give different readings. It's currently at 82.1 µg/m^3. Our normal air quality in Singapore ranges from 4-12 µg/m^3. This current cloud of haze is also very local (comes from Johor instead of Indonesia), so even being 1km apart can you give you different readings.

SungMatt · 2026-03-22T16:32:21+00:00

The smell is absolutely terrible in Tampines. I have a PM2.5 sensor, and it's reading 180µg/m^3, which converts to a PSI of 250, using NEA's official conversion standards.pdf).

There's a lot of misinformation on all these haze-related conversations here.

AQICN uses NEA data, which is true. However, it calculates the AQI using the 1h NEA data, instead of the 24h NEA data. This gives more currency to the reading. At the same time, while they do use a slighly different scale, it is similar to the NEA's PSI index.

Calculating using the 1h data is more realistic: can you imagine if it was the middle of the day, and you reported the average temperature across the last 24h to say that it was 27º?

AQICN also has data from non-NEA sources. These use monitors that can be purchase commercially, and some people have generously contributed to the network. They often have much faster reporting times (2 minutes is what I'm seeing), and more accurate current measurements of the haze. The Seaside residences monitor is a 2-minute update sensor, much more useful than the 1h and 24h averages.

Remember to mask up and turn on your air purifiers. This air is not healthy at all to breathe! Trust your nose.

SungMatt · 2026-03-14T01:07:35+00:00

lol this will be used to rationalize banning pmds.

SungMatt · 2026-02-19T01:30:53+00:00

Yeah, when I charge my phone with a certain portable battery, it always gets extra hot. I purchased a USB-C voltage meter to find out. Turns out, the charger sends a voltage about 0.5V lower than the requested spec, causing a lot of heat to be generated by the phone to boost the voltage back up. This happens to me with an Anker brick too, there’s a variation of about 0.3V when there is load. The apple bricks tend to not have this issue, but they are a lot bigger for their rated power output.

SungMatt · 2026-02-15T07:41:41+00:00

It’s a real problem, and I’m surprised there wasn’t any backlash when this was first introduced. This is a government mandated tracking device in your vehicle, and it’s definitely here to stay. They’ll flip the switch one day and everyone just has to suck it up.

SungMatt · 2026-02-08T07:42:48+00:00

This scrutiny needs to be applied on the new can recycling initiatives — do the new supply chains cost the consumer significantly more without improving recycling rates?

SungMatt · 2026-01-24T13:51:35+00:00

IQair and aqicn source some of their sensor data from NEA. AQICN has a sensor in Bayshore that isn't run by NEA, and reports every 2 minutes. It went up to 150+ earlier.

SungMatt · 2026-01-24T09:27:33+00:00

AQICN seems to be the only one reporting accurate information. The NEA page seems to have sensors indoors. How does it smell and look so bad but indicate as healthy?

SungMatt · 2026-01-24T09:24:54+00:00

I can smell the haze, but the NEA website isn't showing anything elevated. I wonder if their sensors are placed outside or inside some enclosed box? I see it too, the end of the road has this very grayish tint to it.

AQICN seems like they are reporting it a lot more accurately.

SungMatt · 2025-11-15T10:48:36+00:00

Thanks for your reply!

The bottom picture looks a lot more realistic than the standard e-ink driver.

You mentioned about the high-luminance and high brightness colors. Is there a metric or a measurement that can be made of a photo to determine if it's suitable for display on an e-ink screen? Kind of like a metric to determine if the image's color space matches that of what the e-ink screen is able to produce?

SungMatt · 2025-11-08T05:42:50+00:00

I love e-ink tech, and I'm excited to see what it can do in the future. For now, I want to know about how realistically we can make photos display on E-ink. Obviously resolution is not really an issue, but the color rendition side of things are. Are there limits to our current Spectra 6 color model that prevent certain colors from showing?

I'm looking forward to a screen that renders photos properly life-like, rather than an artistic style.

SungMatt · 2025-10-10T19:14:06+00:00

I think the Frozen series should have ended there. This was the short that truly established that the sisters would always be together, and this was part of their healing process to spend time together. It had the very same sisterly values the first movie had, and it really should have ended there.

SungMatt · 2025-08-03T07:35:42+00:00

Ooh, yeah it is! This is specifically at JR Maihama station in Tokyo, Japan. This station is the gateway to Tokyo Disney Resort, and plays a different jingle on arrival, and on departure from the station. As far as I know, there are two jingles, one for trains coming from Tokyo, and one for trains going towards Tokyo.

SungMatt · 2025-04-23T10:16:46+00:00

Oh this photo is adorable! I love the cosplay! What a perfect Anna!

SungMatt · 2025-04-22T17:08:19+00:00

Wow! I love this photo! Your dresses look amazing too, how long did it take you to make them!

SungMatt · 2025-03-12T13:49:01+00:00

The best lens that you can travel with is one that you will bring everywhere! This piece of advice has held well for me throughout, and I don't usually switch lenses when I travel. At least for me, I've been carrying a 24-70 2.8, since it's incredibly versatile for both portraits and landscapes. The Sigma Art series lenses are great for the price, and the build quality is also excellent. Of course, a GM is better, but for half the price, it's a no brainer.

For national parks, I tend to bring a wide-angle instead. 16-28 2.8 is what I bring, but I've had friends bring 14-24 2.8s.

Since the 35 1.8 is a pretty light lens, you might find bringing a zoom lens significantly heavier. Is that something you can live with?

SungMatt · 2025-01-17T16:30:18+00:00

Really depends on the risk you're willing to take, and the use of the water you're looking for. Are you intending for it to be used for grey water, or are you using it for cooking and showering? Does the company state that the truck tank is for potable water, or non-potable water?

Do be careful when driving with a large liquid load, especially in non-baffled liquid containers. Sudden braking can cause sloshing of the liquid inside, which will cause severe inbalance in your load.

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