Understanding Schematic Design

Thought

It looks like you’re deep in the schematic editor with all of your ESP32-C3, power rails, ADC, load-cell front-end and their required decoupling filtering laid out and wired. To make sure I give you the right explanation:

Are you asking about your overall design workflow stage?
Do you want to understand why there are so many decoupling capacitors and resistors?
Or is there a specific net, component, or connection you’re curious about?

Let me know which part you’d like me to dive into!

dirk-builds

@help why do we need multiple decoupling caps of different values on the ESP32 power pins?

Thought

flux

Multiple decoupling capacitors on the ESP32’s power pins serve to filter noise across a very wide frequency range. Each value has its own “sweet-spot” impedance vs. frequency curve, so by combining them you get low impedance from DC up into the hundreds of megahertz.

Table

Capacitor Value	Purpose	Frequency Range Filtered
10 µF (bulk)	Holds up the rail for large, slow transients (e.g. Wi-Fi bursts)	DC – a few MHz
0.1 µF (mid-range)	Local energy reservoir for medium-speed switching	~1 MHz – 50 MHz
0.01 µF or less (high-freq)	Snubs very fast spikes and RF noise	50 MHz – hundreds MHz

By placing:
– a large bulk cap close to your regulator,
– a 100 nF right beside the ESP32 IC1, and
– a small high-frequency cap (e.g. 10 nF or lower) right at the power pin itself

you ensure that switching currents and RF bursts from the ESP32 have a low-impedance path to ground at all relevant frequencies, preventing supply-rail dips, oscillation, and RF-induced glitches.

Find bulk capacitor

Find high-frequency cap

Layout guidelines from datasheet

Routing practice

Files

Schematic

Layout

3D View

ESPRSSO32 Smart Scale AI Auto Layout [Example]