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ESP-Solar OpenDTU

plewka·ESP-Solar_OpenDTU

ESP-Solar OpenDTU PCB layout, top view — open source ESP32 board by plewka

About the ESP-Solar OpenDTU PCB

ESP-Solar OpenDTU is an open source ESP32 PCB design by plewka, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 76 × 72.4 mm, with 43 components from 25 distinct parts.

Its main chip is the ESP-WROOM-32, from the ESP32 family. Other key parts include the DS2485. By type, the board carries 10 capacitors, 8 resistors, 4 diodes, 4 inductors, 2 ICs and 1 transistor.

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

From the project

PCB for OpenDTU in Cable Branchbox, LineSupply w. Fuses, RS485/RS232-Olimex, Relais, DS2485 OneWire, I2C-Header...

Mechanically fits into quite compact HNS 989861-H01 wiring box (form closure only). If not all features are used, even edged Wieland-Socket should fit. LEDs need LightGuides: no. position-drawing and not included in material list

Tradeoff: Very limited space, copyrighted code for ds2485

* WESP32-WROOM-based (internal or external antenna)

5x20 Fuseholder (Supply) Varistor * HiLink Supplymodule f.e. 230V->3.3V

Main components on the ESP-Solar OpenDTU

DS2485ESP-WROOM-32

ESP-Solar OpenDTU bill of materials (BOM)

43 components, 25 distinct parts.

QtyPartRefs
1
DS2485
U1
1
ESP-WROOM-32
U2
1
Q_NPN_BEC
Q1
2
Fuse
FA1, FA2
1
HLK-PM03
PS1
1
SRD-03
REL1
1
Varistor
RV1
1
BH10S
ST_EXT1
1
Conn_01x05
ST_I2C1
1
Conn_01x04
ST_IR1
3
Screw_Terminal_01x03
ST_Line1, ST_OW1, ST_REL1
1
Conn_01x05
ST_PRG1
1
Si24R1
ST_SI1
1
nRF24L01+
ST_nRF1
3
LED
D1, D2, D4
1
US1J
D3
4
FB0805/600R/2A
L1, L2, L3, L4
3
100n
C1, C3, C6
3
C_Polarized_Small
C2, C5, C9
3
22uF/6.3V/20%/X5R/C0603
C4, C7, C10
Show 5 more
QtyPartRefs
1
C_Polarized
C8
3
10k0
R1, R2, R3
3
1k00
R4, R5, R8
1
1k/R0603
R6
1
560R
R7

ESP-Solar OpenDTU design files

The KiCad project lives in the plewka/ESP-Solar_OpenDTU repository on GitHub; these links point at the commit this page was built from.

ESP-Solar OpenDTU: common questions

What microcontroller does the ESP-Solar OpenDTU use?

The ESP-Solar OpenDTU is built around the ESP-WROOM-32, from the ESP32 family.

How big is the ESP-Solar OpenDTU PCB?

The ESP-Solar OpenDTU measures 76 × 72.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP-Solar OpenDTU?

43 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the ESP-Solar OpenDTU design files?

From the plewka/ESP-Solar_OpenDTU repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the ESP-Solar OpenDTU design in my own project?

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

Can I test firmware for the ESP-Solar OpenDTU 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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