Extremely unstable analogReads

Projects General Guidance
17
  1. Try to power the Arduino with 5.5V and use your current reference.
  2. Use the current reference and divided it down to 4.1 volts or so. Add a 0.1 µF cap on the external input pin.
  3. Use the 1.1V internal reference and divide down the inputs to be below 1.1V.

I've now used a 9V DC power supply to power the arduino as well as my 5V voltage reference. It seems to be now at 5V, as supposed to.

Unfortunately, i still get messy inputs:

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I've monitored the actual battery voltage with a solar charger, it did definitely not break down like this.

I will try adding a 10µF (only one i have available atm) capacitor to the external input next...

This is so frustrating :pensive: