@francc@mastodon.online
@francc@mastodon.online avatar

francc

@francc@mastodon.online

Independent software developer, compulsive learner and things maker.

👨🏻‍💻🤓📚🔬🛠⚡🤖🌎🌦️🌈🥑🍌🐒🚶🏻‍♂️🎋

#programming #C #python #rust
#electronics #embedded #esp32 #avr #sensors
#lighting #LED #architecture #design
#woodworking #ceramics #diy
#energy #resilience #climate #airquality
#plants #gardening #compost #bamboo
#argentina #laplata

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francc, to Electronics
@francc@mastodon.online avatar

I learned some days ago how gets trapped inside enclosures used for when exposed to daily cycles of heat and cold.

The cold creates lower pressure inside. If that overpowers the seals, then outside air gets sucked in, carrying moisture. This extra moisture can condense inside and accumulate at the bottom.

In the next warm part of the cycle, if some air is expelled because of the higher pressure, that moisture is not carried out because it is in a liquid state.🧵

francc,
@francc@mastodon.online avatar

Repeat this a lot of times, and you will get the electronic circuit diving inside the enclosure 😂

I want to measure how the humidity and pressure fluctuate inside an enclosure that I'm prototyping for an industrial composting temperature sensor, so I assembled a quick hack with an Adafruit ESP32 Feather V2 running SensorWatcher that will report that every 10 minutes. The sensors are an HTU31D for humidity and a BMP388 for pressure.🧵

#electronics #enclosure #research #esp32 #adafruit

francc, to esp32
@francc@mastodon.online avatar

Finally, I have the first complete working prototype of the temperature sensor for large-scale composting I was working on 🥳

The circuit uses the Xiao ESP32S3 board with a DS18B20 temperature sensor probe and three NiMH low-self-discharge cells.

The sealed enclosure is made with standard heat fusion water pipes of 1/2" and 1" diameter.

The measurements are sent over HTTP to a backend once per hour, with an expected battery life of 1 to 2 years.

#esp32 #compost #sensor #electronics 🧵

Upper part of the enclosure
Enclosure

francc, to random
@francc@mastodon.online avatar

Research about the interaction between low-PH input materials and temperature on the first stage of the composting process:

"When composting acidic feedstocks like food waste, providing a mesophilic phase at the beginning of the process allows the pH to quickly rise to the neutral range, eliminating the inhibitory effects of low pH."

https://www.biocycle.net/optimize-food-composting/

#Compost #CompostScience

compost, to books
@compost@regenerate.social avatar

It is not too late to please a compost lover with a book if you celebrate Christmas.

What is your favorite book on compost? You can post your recommendations for those who are out of ideas.

#compostodon #books

francc,
@francc@mastodon.online avatar

@compost This is the last one I bought:

The Composting Handbook
A how-to and why manual for farm, municipal, institutional and commercial composters
https://www.compostfoundation.org/Education/The-Composting-Handbook

It is focused on medium- to large-scale composting and has lots of information on its 1002 pages! 🤓

There is also an older version from 1992 that is available for free:

On-Farm Composting Handbook (NRAES 54)
https://ecommons.cornell.edu/items/c66de614-e524-46a3-a4cb-031c9a1e7e11

#compost #books

francc, to Hydrogen
@francc@mastodon.online avatar

An interesting podcast episode about the reality and myths of hydrogen as a tool for decarbonization:

https://www.thegreatsimplification.com/episode/63-paul-martin

#hydrogen #energy #transition #climatechange

francc,
@francc@mastodon.online avatar

@Hypx Maybe if you take the time to actually listen to the referred episode before calling it bullshit, your comments will be taken more seriously.

francc, to woodworking
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Santa is early this year! Handmade woodworking tools made in Argentina by Tomás Schenfeld 🎄🎅🥳

https://tswoodtools.com

#woodworking #tools #handmade #argentina

francc, to gardening
@francc@mastodon.online avatar

Three months of kitchen scraps turning into compost, that then will turn into strawberries 🍓🤤

#compost #compostodon #gardening

francc, to random
@francc@mastodon.online avatar

It seems it is #PortfolioDay, but posting a programmer's portfolio is too boring compared with the pictures others are posting now. So here is the portfolio for one of my hobbies instead, which is making lamps 😁

Older posts about these projects are on my feed, tagged with #HuanacusLamp, #PalitoLamp and #Opos.

image/jpeg
image/jpeg
image/jpeg

ScaredyCat, to Electronics

Ok, sorry another n00b question again.
What's the downside of using huge numbers for my resistors in a voltage divider. I can't see any. Even based on price of the components.
There appear to be a lot of upsides for a battery operated device.

Example circuit, hover over the resistors for more detail on current / wattage etc use

http://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgoqoQFMBaMMAKACURMVxCquRCAFigjBtEVRgIWAJ04ZuYXvO4oxIhJXjxZKzuv7Y0GrdsgsA7nrVUxfdeYDmeo3wUg7ElgHsPA4baQpFCw8BiEKMTYxIII2GAoSDDaZIQIEUmcftgsQA

#electronics

francc,
@francc@mastodon.online avatar

@ScaredyCat Maybe it will depend on how much current you need to get from the middle point? Bigger resistors will make it easier for the voltage at the middle point to deviate from the ideal value when you put a load on it.

francc,
@francc@mastodon.online avatar

@ScaredyCat I haven't done any low-power design yet, but I have seen some tricks being used for such cases, like using a FET to disable the divider when the micro is sleeping or even using a GPIO pin as a current sink for the divider that is put in high-impedance mode when sleeping.

francc, to instagramreality
@francc@mastodon.online avatar

Today I'm going down the rabbit hole of DS18B20 chip fakes 🤨.

A quick test of a batch of fakes I bought here in Argentina (because those seem to be the only ones you can buy on the local market) revealed that they measure about -2 C with respect to a real Maxim DS18B20. What a 💩.

I trust the Maxim one because it is within 0.2 C of some Sensirion sensors I have here.

#DS18B20 #sensor #fake #electronics #embedded #ChipShortage

francc,
@francc@mastodon.online avatar

So, I searched on DigiKey for real DS18B20s to include on my next order... and what a surprise!

Almost all variants of the Maxim DS18B20 are out of stock (as expected), but they are now selling those chinese clones at almost the same price as the authentic ones! 🤦‍♂️

https://www.digikey.com/en/products/detail/umw/DS18B20/16705963

Crazy world. That seems to be how the supply chains are working in 2023. 🤪

#DS18B20 #sensor #fake #electronics #embedded #ChipShortage #DigiKey #Maxim

francc,
@francc@mastodon.online avatar

For those of you that want to know if the DS18B20s you have are the real ones or the fake 💩, there is very good information about the differences at https://github.com/cpetrich/counterfeit_DS18B20

#DS18B20 #sensor #fake #electronics #embedded #Maxim

francc, to random
@francc@mastodon.online avatar

Marshmallow-like fungi 🍄👀

#fungi #LaPlata #Argentina

francc, to Argentina
@francc@mastodon.online avatar

Hi, Francisco from #Argentina here, this is my #introduction. I'm an independent software #developer, compulsive #learner and things #maker. Looking forward to bounce ideas off with people that share interests. Currently into:

#programming #electronics #microcontrollers #arduino #sensors #iot

#ux #design #lighting #architecture

#woodworking #ceramics #diy

#energy #efficiency #solar #peakoil

#resilience #climate #adaptation

#plants #gardening #bamboo

#medicine #autoimmunity #nutrition

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