HardLabs

Luna hub lite

jbrinkw·luna-hub-lite·hardware/scale-board/kicad/scale_carrier_board.kicad_sch

This repository ships a schematic but no board layout.

About the Luna hub lite PCB

Luna hub lite is an open source ESP8266 PCB design by jbrinkw, published on GitHub. It is a board, with 20 components from 11 distinct parts.

Its main chip is the WEMOS_D1_MINI, from the ESP8266 family. Other key parts include the HX711. By type, the board carries 9 capacitors, 5 ICs, 4 connectors, 1 diode and 1 resistor.

It belongs with the dev boards & breakouts and iot & wireless designs in this gallery.

From the project

A custom 2-layer PCB that hosts a Wemos D1 Mini (ESP8266) on female pin sockets and breaks out four independent HX711 24-bit ADC channels to four 4-pin load cell connectors. Perfect for a 4-cell smart scale, kitchen scale, occupancy mat, or any project that needs four parallel st

A custom 2-layer PCB that hosts a Wemos D1 Mini (ESP8266) on female pin sockets and breaks out four independent HX711 24-bit ADC channels to four 4-pin load cell connectors. Perfect for a 4-cell smart scale, kitchen scale, occupancy mat, or any project that needs four parallel strain-gauge inputs streamed over WiFi.

Per-channel 4-pin connector pinout (J1..J4):

Main components on the Luna hub lite

WEMOS_D1_MINIHX711

Luna hub lite bill of materials (BOM)

20 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
WEMOS_D1_MINI
WEMOS_D1_mini
U1
4
HX711
Avia Semiconductor
U2, U3, U4, U5
1
LOADCELL0
LoadCell0
J1
1
LOADCELL1
LoadCell1
J2
1
LOADCELL2
LoadCell2
J3
1
LOADCELL3
LoadCell3
J4
1
C72043
PWR
D1
1
100UF
100uF
C1
4
100NF
100nF
C10, C12, C14, C16
4
10UF
10uF
C11, C13, C15, C17
1
1k
R1

Luna hub lite design files

The KiCad project lives in the jbrinkw/luna-hub-lite repository on GitHub; these links point at the commit this page was built from.

Luna hub lite: common questions

What microcontroller does the Luna hub lite use?

The Luna hub lite is built around the WEMOS_D1_MINI, from the ESP8266 family.

How many components are on the Luna hub lite?

20 components, from 11 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 Luna hub lite design files?

From the jbrinkw/luna-hub-lite repository on GitHub, which has the schematic, a netlist and the BOM; the links under Design files point to each one.

Can I use the Luna hub lite design in my own project?

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

Can I test firmware for the Luna hub lite without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.

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