I'm using a breadboard power supply to power up two STM32F103, two Hall flow sensors, one IC555, and one 16x2 LCD with backlight. While everything is connected I have alot of noise in the system which is interfering with my measurements. Input to the breadboard module is 12V DC /2A. Here are the osciloscope images of 5v output and 3.3 V output.
I was thinking of soldering a 1000 microFarad capacitor before the voltage regulator , and adding in parallel to each output a ceramic 100pF capacitor. Will it work?, And how to actually calculate the exact capacitance required to filter this kind of noise? (Sorry for the badly photographed images)