i2pi

8 ms·

1.
by i2pi 2mo ago
Love this!
2.
DIY scanner to visualize sound waves in 3D [video](youtube.com)
2 points by i2pi 6mo ago|0 comments
3.
by i2pi 11mo ago
(void) space. :P
4.
by i2pi 3y ago
Given that this is HN, I should add that I used the wonderful ray-optics Python package for doing the optical design: https://ray-optics.readthedocs.io/en/latest/
5.
by i2pi 3y ago
I was challenged to make a lens for a friend without buying any new optical elements. I have a pile of glass that I've salvaged from old camera lenses that I've modified. I wanted to make a cooke triplet but didn't have any n
6.
I made a bad camera lens from some old glasses [video](youtube.com)
181 points by i2pi 3y ago|62 comments
7.
by i2pi 3y ago
Now try 430Hz.
8.
by i2pi 3y ago
As someone who has just moved back to Australia after ~20 years in the USA, I was surprised to notice how many people reverse park here. It seems to be an ego thing , particularly when I notice how many people do it at the supermarket, wher
9.
by i2pi 3y ago
Muscle movements, think talking, chewing, or blinking, generate voltages orders of magnitude higher on the scalp than sources from neural activity inside the skull.
10.
by i2pi 3y ago
I'm the CTO at Seer Medical, we make a wearable EEG device that's designed to be worn for ~10 days, including during sleep. Totally agree that the electronics is not the difficult part (battery management, and power consumption as
11.
Analog HD video connector shootout(youtube.com)
1 points by i2pi 4y ago|1 comments
12.
by i2pi 4y ago
Really fantastic interview with Uri here at The Amp Hour: https://theamphour.com/599-an-interview-with-uri-shaked-wokw... It's quite a contrast to their previous interview with the creator of LTSpice: https:/&#x2
13.
HD video chromakey in an analog circuit(youtube.com)
1 points by i2pi 4y ago|0 comments
14.
by i2pi 4y ago
You can read more about the underlying algo here: https://medium.com/seer-medical/finding-patterns-in-seizure-... Happy to answer questions about anything seizures, epilepsy, or med-tech related.
15.
We built the first seizure forecaster with no brain implant required(seermedical.com)
4 points by i2pi 4y ago|1 comments
16.
by i2pi 4y ago
The gold standard for BP measurement is direct measurement via an arterial catheter - an invasive and relatively risky procedure. For a device to be approved as a Class 1 medical device for blood pressure measurement, the FDA wants +/-
17.
by i2pi 4y ago
I'm the CTO at a relatively well established medical device company (EEG/ECG). Before I arrived at my current company I spent a year of my own time tinkering in the BP space. The article, while relatively, light on details gives a
18.
Using circular statistics in Python to forecast epileptic seizure risk(medium.com)
7 points by i2pi 5y ago|0 comments
19.
Engineering for Epilepsy(medium.com)
2 points by i2pi 5y ago|0 comments
20.
by i2pi 8y ago
We have p2p wifi between our barn and farm house. The barn is powered by solar. I use engenius WAPs, a 100Ah battery, 2 100W solar panels, a $15 solar charge controller, various buck/boost converters for other power requirements. The s
21.
by i2pi 10y ago
Feel free to make it with Lead Free solder. See RoHS standards: https://en.wikipedia.org/wiki/Restriction_of_Hazardous_Subst...
22.
by i2pi 11y ago
The standards are now much higher, which may be limiting demand. It is far less attractive to apply for a new charter when your growth is curtailed and examinations are more intense and frequent for your first _seven_ years of operation. Yo
23.
by i2pi 11y ago
Money transmission laws are irrelevant in this case. Standard Treasury was never keeping customer cash on their balance sheet, they were enabling APIs for banks. If you're a payments business and cash passes through your balance sheet,
24.
by i2pi 11y ago
De Novo charters are available, but in very limited supply. I think there have been maybe 5 new charters since the crash. Prior to 2008, 100's were issued annually. The problem with acquiring an existing bank is that for any tech compa
25.
Infrastructure as Code(simple.com)
6 points by i2pi 12y ago|0 comments
26.
by i2pi 13y ago
This is the best explanation I've read: http://www.michaelnielsen.org/ddi/how-the-bitcoin-protocol-a...
27.
by i2pi 13y ago
Yes. It's called fractional reserve banking. It isn't a secret conspiracy, nor a deception http://en.wikipedia.org/wiki/Fractional_reserve_banking The alternative is full reserve banking. To the best of my knowledge, there are no full res
28.
by i2pi 13y ago
The market is large enough, the transactions are relatively large, too. In Kenya, M-Pesa is by far, the #1 payments service, with nearly half the country using it. It grew acceptance as a replacement for the other way of remitting money fro
29.
by i2pi 14y ago
Here's my humble attempt: http://blog.i2pi.com/index.cgi?p=182
30.
by i2pi 14y ago
(Josh from Simple here) Not sure if I quite follow. We don't let our customers write checks directly. They can send checks from our apps, but they don't get a checkbook. Even if someone produced checks with one of our customer's account num

More ›