Sensitive Arduino Lightning detector with homemade sensor
https://maker.pro/arduino/projects/sensitive-arduino-lightning-detector-with-homemade-sensor
How to make a Sensitive homemade Lightning detector based on cheap AM Receiver IC TA7642 and Arduino Nano
Simple Sensitive 3 Transistors BFO Metal Detector
https://maker.pro/analog/projects/simple-sensitive-3-transistors-bfo-metal-detector
Despite its simplicity, it gives excellent results. If properly adjusted according to the instructions, it is able to detect a small coin at a distance of 15 cm, and a large metal object at a distance of 50 cm and more.
Advanced Sensitive Lightning detector with PC Graph
https://maker.pro/analog/projects/advanced-sensitive-lightning-detector-with-pc-graph
How to make a very simple lightning detector, which with the help of a personal computer with a sound card, and simple software turns into a serious instrument for monitoring and predicting weather disasters.
DIY Simple Sensitive IB Metal Detector with 2xNE555 IC
https://maker.pro/arduino/projects/diy-simple-sensitive-ib-metal-detector-with-2xne555-ic
A relatively sensitive IB (Induction balance) Metal Detector which is very easy to make, and contains a few standard electronic components
DIY ULTRA-SENSITIVE EMF (Electromagnetic field) Detector
https://maker.pro/arduino/projects/diy-ultra-sensitive-emf-electromagnetic-field-detector
This device can also be called an EMF meter, as it can measure the relative strength of a field using a scale of 10 LEDs.
DIY Extremly Sensitive and cheap Geophone sensor for Earthquakes detecting
https://maker.pro/analog/projects/diy-extremly-sensitive-and-cheap-geophone-sensor-for-earthquakes-detecting
How to make a Geophone sensor yourself for free from parts that can be found in any workshop. However, the sensitivity does not lag behind commercial geophones at all.
DIY extremly Sensitive and cheap Arduino Seismometer
https://maker.pro/arduino/projects/diy-extremly-sensitive-and-cheap-arduino-seismometer
Continuation of the previous project, now presenting the electronic part, which together with the Geophone sensor will represent a complete sensitive home seismometer.
DIY Super Simple Sensitive Metal Detector
https://maker.pro/analog/projects/diy-super-simple-sensitive-metal-detector
Extremely simple Metal Detector whose making requires only one cheap integrated circuit TL084.
Low-Power Button Replacement
with Force-Sensitive Resistor
https://maker.pro/analog/projects/low-power-button-replacementwith-force-sensitive-resistor
This project describes how to create a highly reliable, low-power, temperature-stable button
function.