BUILD GUIDEL1.01 WROOM breakout.
Build this board start to finish: design it, lay it out, then assemble and bring a real one to life. One stage at a time, checked off as you go.
STAGES
0 / 8 completeConcepts behind this build
The free reference guides behind this board: the electronics ideas it assumes, each a short read. No account needed.
- Capacitors and decouplingWhat a capacitor does, why a decoupling cap sits beside every chip, and the difference between ceramic and electrolytic. With real board examples.
- Diodes and LEDsHow a diode passes current one way, why an LED needs a current-limiting resistor, and the forward voltage by color. With a live calculator.
- Grounds and power railsWhy ground is the shared reference, what a power rail is, and why a ground plane beats a thin trace for a quiet board.
- Reading a datasheetA datasheet is the manufacturer's contract for a part. The four sections to read, worked from a real 3.3 V regulator.
Tools for this build
Free calculators that do the math this board needs, each worked from a real OTD board, with the formula and a cited source.
- LiPo battery runtime calculator (ESP32 / microcontroller)Estimate runtime from battery capacity, average current draw, and usable capacity. Worked from a real ESP32-S3 board's measured budget.
- Ohm's law calculator (V, I, R, and power)Solve Ohm's law for voltage, current, or resistance, and get the power. Enter any two of V, I, R. Worked from a real ESP32 board's indicator LED.
- LED series resistor calculator (Ω from supply, Vf, current)Size an LED's current-limiting resistor from supply voltage, forward voltage, and target current. Gives the nearest E24 standard value and the power it burns.
- LDO headroom + dissipation calculator (linear regulator)