2 layers23.4 × 23.5 mm
2 layers62 × 42 mm
Coffee scale
RT-CUSTOMZ/CoffeeScale-HW1- Size
- 62 × 42 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 38
- Nets
- 29
- Pads
- 107
- Tracks, vias
- 221, 18
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 25 Jan 2019
- Updated
- 21 Feb 2019
Overview
Coffee scale is an open-source printed circuit board by RT-CUSTOMZ, from the RT-CUSTOMZ/CoffeeScale-HW repository on GitHub. It is a 2-layer board of 62 × 42 mm with 38 parts on 29 nets, routed with 221 tracks and 18 vias.
It is built around the HX711, LM1117-3.3 and ESP8266-07S, with the MMBT3906 among its other parts. Its parts include 11 capacitors, 10 resistors, 4 connectors, 3 ICs and 2 diodes. It belongs with the ESP8266 boards of this library.
Main components
4
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)
LM1117-3.3
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 3.3V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorisedESP8266-07S
SMD-16P,16.0x17.0SMD-16P,16.0x17.0 New Arrivals ROHSAi-ThinkerUncategorised
MMBT3906
SOT-23-55℃~+150℃ 1 PNP 100 100nA 200mA 200mW 300MHz 300mV 40V 5V PNP SOT-23 Bipolar (BJT) ROHSTWGMCBipolar (BJT)
README
readme.mdHX711 Board
- RATE Pin connected to GND -> 10 Hz mode
- X1 Pin connected to GND -> on-chip oscillator is activate
InteractiveHtmlBom
Schematics
Messbrücke
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2, C4, C6, C7, C8, C9 |
| 6 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2, R3, R4, R7, R9 |
| 3 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5, R6, R8 |
| 3 | LPKF_Passermarke | Library:LPKF_Passermarke_Pad_D1.5mm | LPKF1, LPKF2, LPKF3 |
| 2 | 1u | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C5, C10 |
| 2 | 2u2 | Capacitor_SMD:CP_Elec_4x5.4 | C3, C11 |
| 2 | MountingHole | MountingHole:MountingHole_5.5mm | H1, H2 |
| 1 | 1N4001 | Diode_SMD:D_MELF_Handsoldering | D1 |
| 1 | 250 | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R10 |
| 1 | Conn_01x01_Male | Connector_Wire:SolderWirePad_1x01_Drill1.2mm | J4 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J5 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | J1 |
| 1 | Conn_01x05_Male | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J3 |
| 1 | HX711 | Package_SO:SOP-16_4.4x10.4mm_P1.27mm | IC2 |
| 1 | LM1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | LW_M673 | Library:LW_M673 | D2 |
| 1 | MMBT3906 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | SW_Push_JTP-1130 | Library:SW_SPST_JTP-1130 | SW1 |
| 1 | TestPoint | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | TP1 |
| 1 | esp8266-07 | Library:ESP-07_smd | IC1 |
Questions
How big is the Coffee scale PCB?
It measures 62 × 42 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Coffee scale use?
38 parts, built around the HX711, LM1117-3.3, ESP8266-07S and MMBT3906. 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 Coffee scale KiCad files?
From the RT-CUSTOMZ/CoffeeScale-HW repository on GitHub, at the commit this page was made from: the board is coffee-scale.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Coffee scale design in my own project?
Its repository states no licence, so its author keeps all rights: ask RT-CUSTOMZ before reusing the design.
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