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Esp32-wifi ble weighing scale

IoTReady·esp32-wifi-ble-weighing-scale·design/Single_scale_v3_kicad/Single_scale_v3_kicad.kicad_pcb

Esp32-wifi ble weighing scale PCB layout, top view — open source ESP32 board by IoTReady

About the Esp32-wifi ble weighing scale PCB

Esp32-wifi ble weighing scale is an open source ESP32 PCB design by IoTReady, published on GitHub. It is a 2-layer board measuring 81.2 × 40 mm, with 57 components from 27 distinct parts.

Its main chip is the ESP-WROOM-32, from the ESP32 family. Other key parts include the TP4056IC, HX711IC, FS8205A, DW01A and AP2112-3.3_LDO. By type, the board carries 20 resistors, 14 capacitors, 13 connectors, 7 ICs, 1 transistor and 1 diode.

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

From the project

This is a weighing scale designed to share data over Wi-Fi using esp32 WROOM32 module. For the weighing scale we are using a load cell and measuring the output using a HX711 24-bit ADC designed for weigh scales and industrial control applications to interface directly with a brid

This is a weighing scale designed to share data over Wi-Fi using esp32 WROOM32 module. For the weighing scale we are using a load cell and measuring the output using a HX711 24-bit ADC designed for weigh scales and industrial control applications to interface directly with a bridge sensor.

The final design and gerber files are available here.

We use a TP4056 charging IC, as it is easily available and gives a reasonable 1000 mA output current, with 4.2V output voltage for charging the battery. For preventing the battery from over-charging and over-discharging, we use the DW01A protection IC.…

Esp32-wifi ble weighing scale, from the project README
From the project README

Main components on the Esp32-wifi ble weighing scale

TP4056ICHX711ICFS8205ADW01AESP-WROOM-32AP2112-3.3_LDOBL8530

Esp32-wifi ble weighing scale bill of materials (BOM)

57 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TP4056IC
U1
1
HX711IC
U2
1
FS8205A
U3
1
DW01A
U4
1
ESP-WROOM-32
U5
1
AP2112-3.3_LDO
U6
1
BL8530
U7
1
S8550
Q1
1
Conn_JST_PH
J1
4
Conn_JST_PH
J2, J10, J11, J15
1
Conn_01x5_Female_2.54mm
J3
5
LED_Conn_2.54mm
J4, J5, J12, J13, J14
1
Conn_JST_PH
J6
1
Conn_01x06_Female_2.54mm
J9
1
SS14
D1
1
47uH
L1
4
10uF
C1, C3, C8, C10
6
0.1uF
C2, C4, C5, C7, C9, C13
1
1nF
C6
2
1uF
C11, C12
Show 7 more
QtyPartRefs
1
100uF
C14
9
1k
R1, R2, R9, R11, R12, R13, R14, R17 +1
3
20k
R3, R16, R19
1
8.2k
R4
3
100R
R5, R6, R10
3
10k
R7, R15, R18
1
1.2k
R8

Esp32-wifi ble weighing scale design files

The KiCad project lives in the IoTReady/esp32-wifi-ble-weighing-scale repository on GitHub; these links point at the commit this page was built from.

Esp32-wifi ble weighing scale: common questions

What microcontroller does the Esp32-wifi ble weighing scale use?

The Esp32-wifi ble weighing scale is built around the ESP-WROOM-32, from the ESP32 family.

How big is the Esp32-wifi ble weighing scale PCB?

The Esp32-wifi ble weighing scale measures 81.2 × 40 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Esp32-wifi ble weighing scale?

57 components, from 27 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 Esp32-wifi ble weighing scale design files?

From the IoTReady/esp32-wifi-ble-weighing-scale repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Esp32-wifi ble weighing scale design in my own project?

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

Can I test firmware for the Esp32-wifi ble weighing scale 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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