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Lowpower epaper thermometer

antoinecellerier·lowpower-epaper-thermometer·hardware/thermometer-c6/thermometer-c6.kicad_pcb

Lowpower epaper thermometer PCB layout, top view — open source ESP32 board by antoinecellerier

About the Lowpower epaper thermometer PCB

Lowpower epaper thermometer is an open source ESP32 PCB design by antoinecellerier, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 48 × 35 mm, with 75 components from 37 distinct parts.

Its main chip is the ESP32-C6-MINI-1-N4, from the ESP32 family. Other key parts include the RT9080-33GJ5, USBLC6-2SC6, MCP73831-2 and BMP581. By type, the board carries 27 capacitors, 23 resistors, 6 transistors, 6 diodes, 5 ICs and 3 connectors.

It belongs with the displays & leds, power & battery and sensors designs in this gallery.

From the project

Experiment in building a simple battery powered ESP32 e-Ink room temperature thermometer

Custom PCB replacing the XIAO-C6/FireBeetle dev-board rigs. ESP32-C6-MINI-1 + BMP581 + universal 24-pin EPD interface with on-board gated booster, USB-C charging, LDO power tree. Design driven by the PPK2 measurement campaign in docs/notes.md (repo root).

Status: rev A built and working. Ordered 2026-07-20 (archive/order-2026-07-20/), landed at €273.93, about €68.50 per assembled board (ORDERING.md §8). Where each board is now: BRINGUP.md. Board 1 passed Phases 0–2 on 2026-07-29 (archive/bringup-rev-a-first-article.md). The deployment configuration is board 2 with a GDEH0576T81, fitted…

Lowpower epaper thermometer, from the project README
From the project README

Main components on the Lowpower epaper thermometer

ESP32-C6-MINI-1-N4RT9080-33GJ5USBLC6-2SC6MCP73831-2BMP581

Lowpower epaper thermometer bill of materials (BOM)

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

QtyPartRefs
1
ESP32-C6-MINI-1-N4
U1
1
RT9080-33GJ5
U2
1
USBLC6-2SC6
U3
1
MCP73831-2
U4
1
BMP581
U5
4
AO3401A
Q1, Q2, Q4, Q6
1
SI1308EDL
Si1308EDL
Q3
1
2N7002
Q5
1
C32346
32.768kHz FC-135
Y1
1
C295747
JST-PH-2 BAT
J1
1
C165948
USB-C
J3
1
C2856831
EPD FPC24 0.5mm
J4
1
C318884
RESET
SW1
1
C318884
BOOT
SW2
1
C2286
CHG red
D1
1
SS14
D2
1
C2290
STATUS white
D3
3
MBR0530
D4, D5, D6
1
C38117
10uH SWPA4030S
L1
1
C54731
47uH SWPA4030S
L2
Show 17 more
QtyPartRefs
4
10UF
10uF
C1, C3, C7, C14
1
22UF/25V
22uF/25V
C2
5
100NF
100nF
C4, C8, C12, C13, C15
9
4.7UF/50V
4.7uF/50V
C5, C6, C16, C17, C18, C19, C20, C23 +1
1
1UF
1uF
C9
2
20PF
20pF
C10, C11
3
1UF/50V
1uF/50V
C21, C22, C25
2
10NF
10nF
C28, C29
2
5.1K
5.1k
R1, R2
7
10K
10k
R3, R6, R7, R12, R13, R17, R24
2
1k
R4, R8
5
100K
100k
R5, R18, R19, R22, R23
2
4.7K
4.7k
R10, R11
1
C2930220
0.47R 1%
R14
1
C17521
2.2R 1%
R15
1
C17660
3.0R 1%
R16
2
C25741
100k 1%
R20, R21

Lowpower epaper thermometer design files

The KiCad project lives in the antoinecellerier/lowpower-epaper-thermometer repository on GitHub; these links point at the commit this page was built from.

Lowpower epaper thermometer: common questions

What microcontroller does the Lowpower epaper thermometer use?

The Lowpower epaper thermometer is built around the ESP32-C6-MINI-1-N4, from the ESP32 family.

How big is the Lowpower epaper thermometer PCB?

The Lowpower epaper thermometer measures 48 × 35 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lowpower epaper thermometer?

75 components, from 37 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 Lowpower epaper thermometer design files?

From the antoinecellerier/lowpower-epaper-thermometer 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 Lowpower epaper thermometer design in my own project?

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

Can I test firmware for the Lowpower epaper thermometer 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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