Geiger counter measuring radioactivity using Arduino Nano in 3D-printed housing, with OLED display and Li-ion battery.
Project tutorial by Pedro52
How to control many actuators like relays from one Arduino output pin? Use a strip of NeoPixel LEDs with LDRs as self-made optocouplers!
Many publications exist about moisture sensors for applications, e.g. plant watering systems. Making a DIY Sensor is fun and cost-saving.
Cover your wall with an Arduboy game!
Project tutorial by Bastiaan Slee
A simple PSU made with breakout boards and having a cool graphical display
Project tutorial by settorezero
A simple to build, but very sensitive electromagnetic field detector.
Project tutorial by Mirko Pavleski
I believe that your solution will work and that it eliminates the influence of conductivity variations of the water, but at the cost of a number of ADC input pins (one for each level).
Perhaps putting a small capacitor (100 nF) across the 1 M resistor can reduce the noise.
Good thinking, that could also work, however that way you will be using 6 GPIO's , instead of just 2. In your approach I would connect the ground pin to GND of the circuit and give each wire a resistor, while connecting all resistors to 1 GPIO output pin and the "sensing" pins to the GPIO input pins and the others side of each resistor.
You are very right, the Fritzing diagram is correct. I have meanwhile corrected the electrical diagram in the tutorial. Thank you for the above link
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