the__alchemist

194 ms·

3091.
by the__alchemist 6y ago
Audiobooks - I hope this isn't cheating! The Baroque Cycle, by Neal Stephenson. A mix of swashbuckling adventure, science, alchemy, courtly romance, and politics.
3092.
by the__alchemist 6y ago
I can post the design if you'd like, although it's easy to tell from the datasheet, which lists the main parts. It uses a pair of AD8603 op amps feeding the differential input of a TI ADS1115 ADC. The intent is to use the op amps
3093.
by the__alchemist 6y ago
I'm wondering how feasible it would be to make a system with 3 pumps, and holders for ion-selective probes (pH, ORP etc). In an automated process, flood with sample; measure; evacutate; flood with water to clean; evacuate; flood with K
3094.
by the__alchemist 6y ago
Nice! pairs well with the 3Blue1Br video on the subject: https://www.youtube.com/watch?v=X8jsijhllIA Hamming's book The Art of doing Science and Engineer's a solid read. Mixed topics, centered around problem solvi
3095.
by the__alchemist 6y ago
I hadn't heard of the tech before - but looks like it would solve some of the constraints on glass electrodes. I'm curious now too.
3096.
by the__alchemist 6y ago
Hopefully my reply to xupybd above should share light on calibration. The device doesn't have onboard memory, so you use the software to get calibration data, then save it to either your program file, or save/load to a file, memor
3097.
by the__alchemist 6y ago
Haven't tested on ESP, but that would be a great idea, given its ease of use with IoT/connectivity. I've only tested on Arduino, Raspberry Pi, and STM32.
3098.
by the__alchemist 6y ago
Correct. You need solutions at those levels. As sovreign said, they're typically available at levels around 4, 7, and 10. With the example code, you'd insert into the buffer solution, then run (for example, in Python) ``` # place
3099.
by the__alchemist 6y ago
This is about a secondary point brought up: It's clear and unhidden large tech companies like Google, Apple, and Amazon rely on self-interacting ecosystems. This isn't always aligned with making a good product for the user. I wond
3100.
by the__alchemist 6y ago
No idea. Sounds awesome. Might be a higher quality probe, or one designed with low drift rate in mind, given its marketed as an industrial probe. That length doesn't specify how much drift is expected, so it's unclear what toleran
3101.
by the__alchemist 6y ago
Great idea - on it.
3102.
by the__alchemist 6y ago
I don't think there's a way around periodic calibration if you want precise measurements. At least not with normal glass electrodes. If the precision requirements are loose, you could go months between calibration. If you're
3103.
by the__alchemist 6y ago
Unknown - I'm testing them, but can't provide data longer than the time since start. They're double-junction, which helps with logevity by slowing contamination of the internal KCl solution. My intent is to have them used for
3104.
by the__alchemist 6y ago
I love the formatting, pictures, and cautions. Good visual flow too. I'm a bit surprised it doesn't go into the technical aspects of what's going on with the transfer functions, which op-amps/ADC are used etc.
3105.
by the__alchemist 6y ago
I'm working with the creator of [Mycodo]( https://kizniche.github.io/Mycodo/ ) on a PR to get it added there. I don't have much experience with Mycodo, but it seems like a nice consolidated platform for measuri
3106.
by the__alchemist 6y ago
I was surprised that this doesn't seem to be the case - For example, I can't find any pH sensor on Adafruit. There is a model that's easy to find on eBay or Amazon, sold under various brands - I was unable to get this working
3107.
Show HN: AnyLeaf – PH Sensor for Microcontrollers(anyleaf.org)
90 points by the__alchemist 6y ago|58 comments
3108.
by the__alchemist 6y ago
How old were the victims who died?
3109.
by the__alchemist 6y ago
I know no one who has it, or had had it. One of the spouses of someone in my organization had it. North Carolina, USA
3110.
by the__alchemist 6y ago
It's not clear the article describes or provides evidence for its headline. Anecdotes about well-off people having the luxury to short-term move overseas, buy webcams on Amazon, stocks etc. No justification. Could have made the point b
3111.
by the__alchemist 7y ago
I'm attempting to make Python tooling as simple and user-friendly as possible. Python's a beautiful language, but its dependency, interpreter-management, and build ecosystem is comparatively clumsy; I think we can improve it witho
3112.
Pyflow – A Cleaner Python Workflow(github.com)
4 points by the__alchemist 7y ago|1 comments