it uses the headphone jack as the ADC. the app is called huskerscope. i made this little board to allow me to have an input

These are pre-generated labels that can be set up after printing. I provide them for free to download here. If you are in the EU you can also buy them printed on a sheet of adhesive paper.

link is for buying a kit, but i see they also have opensource kicad/step files on the page for the ability to diy

cross-posted from: https://lemmy.ml/post/432966

I am doing "prior art" research to find out what are reliable and open constructions of sensors (and controlling/recording) platforms used in citizen monitoring of environment.

Due to recent events in Poland, priority topic is river monitoring:

• water temperature,
• pH,
• conductivity,
• dissolved oxygen,
• turbidity,
• ORP (oxidation reduction potential),
• water level (sonar?).

Also, typical weather station sensors recommendations will be appreciated.

If you know about an active group dealing with river environment monitoring, please drop a link here – I will be happy to learn from them.

At this stage, I do not intend to start any deep R&D. I need to learn about good (best!) practices and appropriate hardware, so we can deploy a network of early warning checkpoints as soon and as cheaply as possible.

Onboard-RP2040 | USB-C Type Port | Multiple HAT Connectivity | ESP8266 | 0.91 OLED | 40-Pins GPIO Connectivity | 16 Mega-Bits Flash

"PiSquare an RP2040 & ESP-12E based board, a smart way to use multiple Raspberry Pi HATs without stacking on Raspberry Pi. PiSquare uses Socket programming to communicate Multiple ("n" numbers of HATs) Raspberry Pi HATs wirelessly."

Connecting Multiple Raspberry Pi HATs Wirelessly without Multistaking

AC DC Converter with Two Channels Compact and Powerful With an output voltage of 24V+5V, a very compact volume, and low power consumption, this dual output device with an industrial grade design can function in temperatures ranging from -40 to 85 degrees Celsius and control up to two devices at the same time.