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Exposed power rails

OLIMEX·RVPC·SOFTWARE/rvpc/tools/esp32s2-cookbook/hardware/exposed_power_rails/exposed_power_rails.kicad_pcb

Exposed power rails PCB layout, top view — open source ESP32 board by OLIMEX

About the Exposed power rails PCB

Exposed power rails is an open source ESP32 PCB design by OLIMEX, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 35 × 35 mm, with 37 components from 18 distinct parts.

Its main chip is the ESP32-S2, from the ESP32 family. Other key parts include the HX6306P332MR. By type, the board carries 14 capacitors, 10 resistors, 7 ICs, 3 connectors, 2 diodes and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

The EURO 1.00 Risc-V personal computer with VGA and Keyboard and Woz like monitor. The purpose of this project is to make educational platform which people can use to learn RISCV assembler and experiment like in the old days in 1980s :)

TODO: Check out RTCIOSARI2CIO_REG -> Does it reveal anything?

Main components on the Exposed power rails

HX6306P332MRESP32-S2

Exposed power rails bill of materials (BOM)

37 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
6
HX6306P332MR
U1, U2, U3, U4, U6, U7
1
ESP32-S2
U5
1
40MHz
Y1
1
USB_C_Receptacle_USB2.0
J1
1
HEADER
J2
1
XTAP
J3
1
1N4148/DO35
D
D1
1
LED_BGAR
D2
1
100NF/25V/2010
1u
C1
10
1u
C2, C3, C4, C5, C6, C7, C11, C12 +2
3
10p
C8, C9, C10
2
2K/1/8W
5.1k
R1, R6
1
470R/1/8W
5.1k
R2
2
470R/1/8W
22
R3, R4
1
2K/1/8W
ANT
R5
1
100R/1/8W
5.1k
R7
1
2K/1/8W
100
R8
2
100
R9, R10

Exposed power rails design files

The KiCad project lives in the OLIMEX/RVPC repository on GitHub; these links point at the commit this page was built from.

Exposed power rails: common questions

What microcontroller does the Exposed power rails use?

The Exposed power rails is built around the ESP32-S2, from the ESP32 family.

How big is the Exposed power rails PCB?

The Exposed power rails measures 35 × 35 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Exposed power rails?

37 components, from 18 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Exposed power rails design files?

From the OLIMEX/RVPC repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Exposed power rails design in my own project?

Yes, under the terms of its GPL-3.0 license, which OLIMEX chose for the repository.

Can I test firmware for the Exposed power rails without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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