HardLabs

Double oh

heyspacebuck·double-oh·hardware/double-oh.kicad_pcb

Double oh PCB layout, top view — open source RP2040/RP2350 board by heyspacebuck
Simulate this board

About the Double oh PCB

Double oh is an open source RP2040/RP2350 PCB design by heyspacebuck, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 49.2 × 9 mm, with 51 components from 31 distinct parts.

Its main chip is the ESP32-PICO-D4, from the RP2040/RP2350 family. Other key parts include the MCP73831-2-OT, CP2104, TPS62400 and BD48KxxG. By type, the board carries 14 resistors, 13 connectors, 8 capacitors, 5 ICs, 3 transistors and 3 diodes.

It belongs with the power & battery and iot & wireless designs in this gallery.

From the project

A WiFi-enabled power supply in a AA battery form factor, designed for sex toys

This is the spiritual successor to the SMOL, a tiny PCB that interrupts battery output to make fun patterns. By designing around a 10mm-by-44mm LiPo cell, I've been able to add Wi-Fi connectivity, a USB connection for charging and programming, and a dangerous (but intriguing!) overvoltage mode.

The star of the show is the ESP32-PICO-D4, a 7mm-by-7mm powerhouse. It handles the wireless networking and various GPIOs.

Double oh, from the project README
From the project README

Main components on the Double oh

MCP73831-2-OTCP2104TPS62400ESP32-PICO-D4BD48KxxG

Double oh bill of materials (BOM)

51 components, 31 distinct parts.

QtyPartRefs
1
MCP73831-2-OT
U1
1
CP2104
U2
1
TPS62400
U3
1
ESP32-PICO-D4
U4
1
BD48KxxG
U5
1
Q_DUAL_NPN_NPN_E1B1C2E2B2C1
Q1
2
Q_PMOS_GSD
Q2, Q3
1
USB_B_Micro
J1
4
Conn_01x01
J2, J3, J4, J12
4
Conn_01x01
J5, J6, J7, J13
2
Conn_01x01
J8, J11
2
Conn_01x01
J9, J10
1
Antenna_Chip
AE1
1
Jumper_NO_Small
JP1
1
LED_Small_ALT
D1
1
D_ALT
D2
1
D_Schottky
D3
1
3.9nH
L1
2
2.2μH
L2, L3
3
4.7μF
C1, C2, C3
Show 11 more
QtyPartRefs
3
10μF
C4, C5, C6
1
33pF
C7
1
1.5pF
C8
6
68kΩ
R1, R3, R6, R7, R13, R14
1
3kΩ
R2
1
2kΩ
R4
2
470kΩ
R5, R9
1
1kΩ
R8
1
120kΩ
R10
1
330kΩ
R11
1
300kΩ
R12

Double oh design files

The KiCad project lives in the heyspacebuck/double-oh repository on GitHub; these links point at the commit this page was built from.

Double oh: common questions

What microcontroller does the Double oh use?

The Double oh is built around the ESP32-PICO-D4, from the RP2040/RP2350 family.

How big is the Double oh PCB?

The Double oh measures 49.2 × 9 mm, has 2 copper layers and is 0.6 mm thick.

How many components are on the Double oh?

51 components, from 31 distinct parts. The full bill of materials is listed on this page.

Where can I download the Double oh design files?

From the heyspacebuck/double-oh repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Double oh design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which heyspacebuck chose for the repository.

Can I test firmware for the Double oh without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

More boards in double-oh

Similar boards