This is a write-up on StratoSpore, a payload I designed and launched to the stratosphere. The goal was to test if we could estimate physical altitude based on algae fluorescence (using a lightweight ML model trained on the sensor data).
The blog post covers the full engineering mess/process, including:
- The Hardware: Designing PCBs for the AS7263 spectral sensor and Pi Zero 2 W.
-The biological altimeter: How I tried to correlate biological stress (fluorescence) with altitude.
- The Communications: A custom lossy compression algorithm I wrote to smash 1080p images down to 18x10 pixels so I could transmit them over LoRA (915 Mhz) in semi-real-time.
The payload is currently lost in a forest, but the telemetry data survived. The code and hardware designs are open source on GitHub: https://github.com/radeeyate/stratospore
I'm happy to answer technical questions about the payload, software, or anything else you are curious about! Critique also appreciated!"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["altimeter"],"value":"Show HN: I turned algae into a bio-altimeter and put it on a weather balloon"},"url":{"matchLevel":"none","matchedWords":[],"value":"https://radi8.dev/blog/stratospore/"}},"_tags":["story","author_radeeyate","story_46016288","show_hn"],"author":"radeeyate","children":[46059571,46059867,46060312,46061420,46061895,46062025,46064155,46064710,46066456],"created_at":"2025-11-22T17:11:52Z","created_at_i":1763831512,"num_comments":13,"objectID":"46016288","points":142,"story_id":46016288,"story_text":"Hi HN - My name is Andrew, and I'm a high school student.
This is a write-up on StratoSpore, a payload I designed and launched to the stratosphere. The goal was to test if we could estimate physical altitude based on algae fluorescence (using a lightweight ML model trained on the sensor data).
The blog post covers the full engineering mess/process, including:
- The Hardware: Designing PCBs for the AS7263 spectral sensor and Pi Zero 2 W.
-The biological altimeter: How I tried to correlate biological stress (fluorescence) with altitude.
- The Communications: A custom lossy compression algorithm I wrote to smash 1080p images down to 18x10 pixels so I could transmit them over LoRA (915 Mhz) in semi-real-time.
The payload is currently lost in a forest, but the telemetry data survived. The code and hardware designs are open source on GitHub: https://github.com/radeeyate/stratospore
I'm happy to answer technical questions about the payload, software, or anything else you are curious about! Critique also appreciated!","title":"Show HN: I turned algae into a bio-altimeter and put it on a weather balloon","updated_at":"2026-03-05T23:05:17Z","url":"https://radi8.dev/blog/stratospore/"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"tnorthcutt"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["altimeter"],"value":"Airline CEOs make U-turn, now say 5G isn\u2019t a big problem for altimeters"},"url":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["altimeter"],"value":"https://arstechnica.com/tech-policy/2022/01/airline-ceos-make-u-turn-now-say-5g-isnt-a-big-problem-for-altimeters/"}},"_tags":["story","author_tnorthcutt","story_30030943"],"author":"tnorthcutt","children":[30030955],"created_at":"2022-01-21T22:46:32Z","created_at_i":1642805192,"num_comments":0,"objectID":"30030943","points":25,"story_id":30030943,"title":"Airline CEOs make U-turn, now say 5G isn\u2019t a big problem for 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- API calls and cache efficiency
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- API calls and cache efficiency
- Per-model breakdown
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era"},"url":{"matchLevel":"none","matchedWords":[],"value":"http://www.pnas.org/content/early/2018/02/06/1717312115"}},"_tags":["story","author_nabla9","story_16369277"],"author":"nabla9","created_at":"2018-02-13T18:09:12Z","created_at_i":1518545352,"num_comments":0,"objectID":"16369277","points":1,"story_id":16369277,"title":"Climate-change\u2013driven accelerated sea-level rise detected in the altimeter era","updated_at":"2024-09-20T02:05:44Z","url":"http://www.pnas.org/content/early/2018/02/06/1717312115"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"jayliew"},"story_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["altimeter"],"value":"
This is just an MVP; the back end does not scale well (this is so not intended for outside of just our small HN community here). I'm actually embarrassed to post this here, but if you're not embarrassed, you've waited too long to launch, right? So here's my first pitch for HN-peer-review.
Q: In a nutshell, what is it? \nA: Auto-response, for Twitter. (Twitter for now, possibly Facebook later)
Q: Why the name? \nA: It's from Altimeter's Jeremiah Owyang's 18 Use Cases of Social CRM report, I thought this app would help in the use case(s) he listed: http://bit.ly/csoAJC
Q: I don't want to even visit the site, just 'show me' the value prop.\nA: Ok, tweet \"@jaysern hi !!!\"
Q: Anything else in it just for HN readers?\nA: Aside from the use cases I listed on the site, here's one I did not list: I also pull tweets from public_timeline, so if you try match on hot trending word, your twitter account will tweet out to strangers you've heard of. Here's my user page: http://www.rapidsocialresponse.com/user/jaysern/ (If none of this makes sense, don't worry - just ignore)
I was delaying posting this on HN because I wanted to make sure I got the Mixpanel analytics working right (since learning is point!) Thanks much YC alumni & Mixpanel's cofounder @trefn for helping me with the tech support!"},"title":{"matchLevel":"none","matchedWords":[],"value":"Ask HN: Pls review my product: Rapid Social Response "},"url":{"matchLevel":"none","matchedWords":[],"value":"http://www.rapidsocialresponse.com"}},"_tags":["story","author_jayliew","story_1306883"],"author":"jayliew","children":[1306887,1306931,1306982,1307080,1307138,1307143,1307609,1307642],"created_at":"2010-04-30T01:58:17Z","created_at_i":1272592697,"num_comments":23,"objectID":"1306883","points":26,"story_id":1306883,"story_text":"<oops> I posted this Ask HN wrong - this body of text is supposed to be up there, but I don't want to delete and repost this because I'll lose the comments here.\n</oops>
This is just an MVP; the back end does not scale well (this is so not intended for outside of just our small HN community here). I'm actually embarrassed to post this here, but if you're not embarrassed, you've waited too long to launch, right? So here's my first pitch for HN-peer-review.
Q: In a nutshell, what is it? \nA: Auto-response, for Twitter. (Twitter for now, possibly Facebook later)
Q: Why the name? \nA: It's from Altimeter's Jeremiah Owyang's 18 Use Cases of Social CRM report, I thought this app would help in the use case(s) he listed: http://bit.ly/csoAJC
Q: I don't want to even visit the site, just 'show me' the value prop.\nA: Ok, tweet \"@jaysern hi !!!\"
Q: Anything else in it just for HN readers?\nA: Aside from the use cases I listed on the site, here's one I did not list: I also pull tweets from public_timeline, so if you try match on hot trending word, your twitter account will tweet out to strangers you've heard of. Here's my user page: http://www.rapidsocialresponse.com/user/jaysern/ (If none of this makes sense, don't worry - just ignore)
I was delaying posting this on HN because I wanted to make sure I got the Mixpanel analytics working right (since learning is point!) Thanks much YC alumni & Mixpanel's cofounder @trefn for helping me with the tech support!","title":"Ask HN: Pls review my product: Rapid Social Response ","updated_at":"2023-09-06T19:26:44Z","url":"http://www.rapidsocialresponse.com"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"rlrhaeck"},"story_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["altimeter"],"value":"I have been working on a new mountain biking app for the last year called Hangtime. It is a free ride computer app that uses a smartphone's GPS, accelerometer, gyroscope, and altimeter to track a mountain bike ride. After recording a ride, the user can go back and see their performance in turns, jumps, climbs, etc. Below is a video that shows off some of the app's features.
https://youtu.be/TXiwzf-UJhQ
I wasn't sure I could get the performance required from Flutter/Dart vs. native as a one hour ride generates well over a million data points from all of the sensor data. However, performance has been more than adequate and the single code base has streamlined development.
If you want to give it a try, below are links to the app stores.
https://play.google.com/store/apps/details?id=com.rlued.hangtime
https://apps.apple.com/us/app/mtb-hangtime/id1516615267"},"title":{"matchLevel":"none","matchedWords":[],"value":"Show HN: A New Flutter App for Mountain Biking"}},"_tags":["story","author_rlrhaeck","story_26937229","show_hn"],"author":"rlrhaeck","children":[26938184,26947087,26955174],"created_at":"2021-04-25T22:14:32Z","created_at_i":1619388872,"num_comments":4,"objectID":"26937229","points":6,"story_id":26937229,"story_text":"I have been working on a new mountain biking app for the last year called Hangtime. It is a free ride computer app that uses a smartphone's GPS, accelerometer, gyroscope, and altimeter to track a mountain bike ride. After recording a ride, the user can go back and see their performance in turns, jumps, climbs, etc. Below is a video that shows off some of the app's features.
https://youtu.be/TXiwzf-UJhQ
I wasn't sure I could get the performance required from Flutter/Dart vs. native as a one hour ride generates well over a million data points from all of the sensor data. However, performance has been more than adequate and the single code base has streamlined development.
If you want to give it a try, below are links to the app stores.
https://play.google.com/store/apps/details?id=com.rlued.hangtime
https://apps.apple.com/us/app/mtb-hangtime/id1516615267","title":"Show HN: A New Flutter App for Mountain Biking","updated_at":"2024-09-20T08:25:26Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"ugur2nd"},"story_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["altimeter"],"value":"I wonder if OpenAI has gone public. Are all these investments closed investments? Thrive Capital, Microsoft, Khosla Ventures, Nvidia, SoftBank, Fidelity Management and Research Company, Altimeter Capital, MGX. I know these are closed investments. But if OpenAI is listed on the stock exchange, I might want to consider it.
What do you guys think?"},"title":{"matchLevel":"none","matchedWords":[],"value":"Ask HN: OpenAI IPO?"}},"_tags":["story","author_ugur2nd","story_41729486","ask_hn"],"author":"ugur2nd","created_at":"2024-10-03T11:11:14Z","created_at_i":1727953874,"num_comments":0,"objectID":"41729486","points":1,"story_id":41729486,"story_text":"I wonder if OpenAI has gone public. Are all these investments closed investments? Thrive Capital, Microsoft, Khosla Ventures, Nvidia, SoftBank, Fidelity Management and Research Company, Altimeter Capital, MGX. I know these are closed investments. But if OpenAI is listed on the stock exchange, I might want to consider it.
What do you guys think?","title":"Ask HN: OpenAI IPO?","updated_at":"2024-10-03T11:14:18Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"magneticmonkey"},"title":{"matchLevel":"none","matchedWords":[],"value":"FCC considers crackdown on bad wireless receivers"},"url":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["altimeter"],"value":"https://arstechnica.com/tech-policy/2022/03/fcc-considers-crackdown-on-bad-wireless-receivers-after-5g-altimeter-debacle/"}},"_tags":["story","author_magneticmonkey","story_30587331"],"author":"magneticmonkey","children":[30587428,30587564,30588131,30588597],"created_at":"2022-03-07T13:15:21Z","created_at_i":1646658921,"num_comments":4,"objectID":"30587331","points":10,"story_id":30587331,"title":"FCC considers crackdown on bad wireless 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