2 layers29 × 46.7 mm
4 layers100 × 129.8 mm
Projet balance
KeegRoc/Inventaire_Intelligent- Size
- 100 × 129.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 99
- Nets
- 79
- Pads
- 307
- Tracks, vias
- 546, 41
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 5 Jun 2026
- Updated
- 10 Jun 2026
Overview
Projet balance is an open-source printed circuit board by KeegRoc, from the KeegRoc/Inventaire_Intelligent repository on GitHub. It is a 4-layer board of 100 × 129.8 mm with 99 parts on 79 nets, routed with 546 tracks and 41 vias.
It is built around the ESP32-S3-WROOM-1-N8, HX711 and LDL1117S33R, with the MMBTA56, PTVS5V0Z1USKYL and WS2812B among its other parts. Its parts include 18 resistors, 14 capacitors, 14 diodes, 7 connectors and 4 ICs. It belongs with the ESP32 boards of this library.
Main components
6
ESP32-S3-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -98.2dBm 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
HX711
SOP-16-40℃~+85℃ 1.4mA 10Hz、80Hz 1MHz~20MHz、11.0592MHz 2 2.6V~5.5V 20mV、40mV、80mV 24 Built-in External、Built-in SPI Support Yes SOP-16 Analog to Digital Converters (ADC) ROHSAvia SemiconAnalog To Digital Converters (ADC)
LDL1117S33R
SOT-223-4-40℃~+125℃@(Tj) 1 1.2A 18V 3.3V 500uA 600mV@(1.2A) 60uVrms 87dB@(120Hz) Fixed Over Current Protection、Thermal Shutdown Positive SOT-223-4 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MMBTA56
SOT-23-55℃~+150℃ 1 PNP 100 100nA 225mW 250mV 4V 500mA 50MHz 80V PNP SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
PTVS5V0Z1USKYL
06031.2nF 18V 200W 20A 25nA 5V 6.4V TVS 0603 ESD and Surge Protection (TVS/ESD) ROHSNexperiaESD And Surge Protection (TVS/ESD)
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
Parts
99| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | TestPoint | footprint:test_point_proto2 | GPIO1, GPIO2, GPIO3, GPIO10, GPIO11, GPIO12, GPIO13, GPIO14, GPIO15, GPIO16, GPIO17, GPIO18, GPIO21, GPIO35, GPIO36, GPIO37 +9 |
| 9 | Diode_SMD:D_SOD-323F | Diode_SMD:D_SOD-323F | D2, D4, D5, D6, D10, D11, D12, D13, D14 |
| 6 | 0.1uF | footprint:RC1206N_YAG-M | C1, C2, C4, C5, C8, C11 |
| 4 | 0 | footprint:1206LSeries_LTF-M | R00, R8, R9, R10 |
| 4 | 100 | footprint:RC1206N_YAG-M | R3, R4, R15, R16 |
| 4 | 10k | footprint:1206LSeries_LTF-M | R6, R7, R13, R17 |
| 4 | MountingHole_Pad_MP | TestPoint:TestPoint_Loop_D3.50mm_Drill1.4mm_Beaded | H1, H2, H3, H4 |
| 2 | 1uF | footprint:1206LSeries_LTF-M | C10, C14 |
| 2 | SW_Push | footprint:SW_TL3305AF260QG | SWBootOption1, SWRESET1 |
| 1 | 0.1uF | footprint:1206LSeries_LTF-M | C16 |
| 1 | 10uF | footprint:RC1206N_YAG-M | C6 |
| 1 | 1N4148 | footprint:SOD3716X135N | D3 |
| 1 | 1N5824 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D8 |
| 1 | 20k | footprint:RC1206N_YAG-M | R1 |
| 1 | 22 | footprint:1206LSeries_LTF-M | R12 |
| 1 | 220 | footprint:1206LSeries_LTF-M | R14 |
| 1 | 220uF | footprint:CAP_16SVPK220M | C13 |
| 1 | 22uF | footprint:1206LSeries_LTF-M | C9 |
| 1 | 3.3uH | footprint:IND_LQH44PN3R3MP0K | L1 |
| 1 | 33uH | footprint:IND_TAIYO_NRS6028_TAY | L2 |
| 1 | 4.7k | footprint:1206LSeries_LTF-M | R5 |
| 1 | 4.7uF | footprint:1206LSeries_LTF-M | C15 |
| 1 | 5.1k | footprint:1206LSeries_LTF-M | R11 |
| 1 | 680uF | footprint:CAP_16SVPK680M | C17 |
| 1 | 8.2k | footprint:RC1206N_YAG-M | R2 |
| 1 | Batt | footprint:PHOENIX_1702473 | JBatt1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | JP4 |
| 1 | Conn_01x10 | footprint:PHOENIX_1725737 | J9 |
| 1 | Conn_01x10 | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J10 |
| 1 | ESP32-S3-WROOM-1 | RF_Module:ESP32-S3-WROOM-1 | U2 |
| 1 | Fuse | Projet:Resistance 1206 | F1 |
| 1 | HX711 | Package_SO:SOP-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | JTAG | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | JP1 |
| 1 | Jumper | footprint:CONN03_87898_M-5p84_MOL | J2 |
| 1 | LCD | footprint:CONN03_87898_M-5p84_MOL | J5 |
| 1 | LDL1117S33R | footprint:SOT230P700X180-4N | U3 |
| 1 | LED_SET | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | D7 |
| 1 | LM2575-5.0BU | footprint:VREG_TPS79625KTTR | U5 |
| 1 | MMBTA56 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | On/Off | footprint:SW_JS202011SCQN | SW3 |
| 1 | PTVS5V0Z1USK | footprint:SMASeries_LTF-M | D9 |
| 1 | Power jack 9V | footprint:CUI_PJ-002A | J3 |
| 1 | SW_OPT | footprint:SW_TL3305AF260QG | SW4 |
| 1 | SW_SEL | footprint:SW_TL3305AF260QG | SW2 |
| 1 | UART | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | JP2 |
| 1 | USB_C_Plug_USB2.0 | footprint:GCT_USB4215-03-A_REVA | P1 |
| 1 | WS2812B | footprint:COM-16347_SPK-M | D1 |
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Questions
How big is the Projet balance PCB?
It measures 100 × 129.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Projet balance use?
99 parts, built around the ESP32-S3-WROOM-1-N8, HX711, LDL1117S33R and MMBTA56. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Projet balance KiCad files?
From the KeegRoc/Inventaire_Intelligent repository on GitHub, at the commit this page was made from: the board is Schema_inventaire/Projet_balance.kicad_pcb and its schematic Schema_inventaire/Alimentation.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Projet balance design in my own project?
Its repository states no licence, so its author keeps all rights: ask KeegRoc before reusing the design.