HardLabs

OTlight

opeRaptor·OTlite

OTlight PCB layout, top view — open source ESP32 board by opeRaptor

About the OTlight PCB

OTlight is an open source ESP32 PCB design by opeRaptor, published on GitHub. It is a 2-layer board measuring 90 × 55 mm, with 60 components from 30 distinct parts.

Its main chip is the ESP32, from the ESP32 family. Other key parts include the LM3478, DS3231, PushButton, bareBME280 and IN-14. By type, the board carries 23 resistors, 17 capacitors, 14 ICs, 2 transistors, 2 diodes and 1 connector.

It belongs with the displays & leds and iot & wireless designs in this gallery.

From the project

obsolete;time lite, IoT Nixie Tube Nixie Display

Obsolete Time Lite or O;TL for short, is the natural evolution of a previous project aiming to design the perfect desktop Nixie clock.

Follow development on HackaDay.io: https://hackaday.io/project/20439-obsolete-time-lite-a-minty-nixie-clock

OTlight, from the project README
From the project README

Main components on the OTlight

LM3478ESP32DS3231PushButtonbareBME280IN-14MAX6931MAX6920

OTlight bill of materials (BOM)

60 components, 30 distinct parts.

QtyPartRefs
1
LM3478
U1
1
ESP32
U2
1
DS3231
U3
3
PushButton
U4, U5, U6
1
bareBME280
U7
4
IN-14
U8, U10, U11, U13
2
MAX6931
U9, U12
1
MAX6920
U14
1
TEMT6000
Q1
1
RSR030N06TL
Q2
1
CONN_01X02
P1
1
TRANSFO
T1
1
STPS4S200
D1
1
D_Zener_Small_ALT
D2
1
220u
C1
1
0.001
C2
6
0.1u
C3, C6, C7, C8, C9, C18
1
10u
C4
1
0.01u
C5
1
1u
C10
Show 10 more
QtyPartRefs
6
C_Small
C12, C13, C14, C15, C16, C17
1
1K
R1
1
13K
R2
15
R_Small
R3, R10, R11, R12, R13, R14, R15, R16 +7
1
1M
R4
1
820K
R5
1
24K
R6
1
20
R7
1
0.1
R8
1
15K
R9

OTlight design files

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

OTlight: common questions

What microcontroller does the OTlight use?

The OTlight is built around the ESP32, from the ESP32 family.

How big is the OTlight PCB?

The OTlight measures 90 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OTlight?

60 components, from 30 distinct parts. The full bill of materials is listed on this page.

Where can I download the OTlight design files?

From the opeRaptor/OTlite repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the OTlight design in my own project?

The repository has no license, so all rights stay with opeRaptor. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the OTlight 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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