2 layers137.2 × 83.8 mm
PCBa KRAKE
PubInv/krake
The Krake™ is a Wi-Fi–enabled server using an MQTT broker, which means it can be controlled remotely by other devices ("clients") via the internet.
195 parts9AGPL-3.0
2 layers137.2 × 83.8 mm
PWA REV2
PubInv/krake9The Krake™ is a Wi-Fi–enabled server using an MQTT broker, which means it can be controlled remotely by other devices ("clients") via the internet. It can additionally be controlled by a nearby device via a wired connection using an RS-232 connector or an SPI connection.
- Size
- 137.2 × 83.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 215
- Nets
- 169
- Pads
- 659
- Tracks, vias
- 1,645, 258
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 26 Mar 2024
- Updated
- 7 Nov 2026
Overview
PWA REV2 is an open-source printed circuit board by PubInv, from the PubInv/krake repository on GitHub, published under the AGPL-3.0 licence. It is a 2-layer board of 137.2 × 83.8 mm with 215 parts on 169 nets, routed with 1,645 tracks and 258 vias.
It is built around the CH340B, ESP32-WROOM-32E-N4 and MAX3232ID, with the AMS1117-3.3, PZ254V-11-16P and LM7805CTG among its other parts. Its parts include 87 resistors, 27 capacitors, 15 diodes, 14 transistors and 13 connectors. It belongs with the ESP32 boards of this library.
Main components
12
CH340B
SOP-1615mA 200uA 2Mbps 3.3V、5V Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
ESP32-WROOM-32E-N4
SMD,25.5x18mm-40℃~+85℃ -98dBm 112mA 2.4GHz 20dBm 239mA 3V~3.6V Bluetooth4.2 ESP32-D0WD-V3、ESP32-D0WDR2-V3 On-board PCB Antenna UART、SDIO、SPI、I2C、GPIO SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi ModulesMAX3232ID
SOIC-16-40℃~+85℃ 2 2 250Kbps 300uA 3V~5.5V Short-Circuit Protection Transceiver Yes ±15kV SOIC-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
PZ254V-11-16P
插件,P=2.54mm-40℃~+105℃ 1 16P 1x16P 2.54mm 2.5mm 3A 3mm 6.1mm Black Brass Square pin Through Hole Plugin,P=2.54mm Pin Headers ROHSXFCNPin Headers
LM7805CTG
TO-2200℃~+85℃@(Ta) 1 1A 2V@(1A) 35V 42uV 5V 5mA 73dB@(120Hz) Fixed Over Temperature Protection、Short Circuit Protection Positive TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHANSCHIP semiconductorVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
RMC06033301%N
0603-55℃~+155℃ 100mW 330Ω 50V Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSTyoHMChip Resistor - Surface Mount
CC0603KRX7R9BB104
0603100nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMTRMC060315%N
0603-55℃~+155℃ 100mW 1Ω 50V Thick Film Resistor ±400ppm/℃ ±5% 0603 Chip Resistor - Surface Mount ROHSTyoHMChip Resistor - Surface Mount
RVT47UF16V67RV0019
SMD,D5xL5.4mm-55℃~+105℃ 16V 2000hrs@105℃ 33mA@120Hz 47uF 5.4mm 5mm ±20% SMD,D5xL5.4mm Aluminum Electrolytic Capacitors - SMD ROHSKNSCHAAluminum Electrolytic Capacitors - SMD
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
LTW-2R3D7
插件-40℃~+105℃ 20mA 3.4V 35° 4.2cd 5mm round lamp head 76mW Water Clear White 插件 LED Indication - Discrete ROHSLite-OnLED Indication - Discrete
README
PWA_REV2/README.mdSummary
The Krake Rev 2 PWA fixes a major problem with the CH340 USB to UART feature of Rev 1 which was missing a crystal from the PCB and could not work.
Document Descriptions
for some selected documents in this folder.
The Rev2 PWA Krake_Test_and_Assembly_Procedure.md
References
Link to issue capturing the order from PCBWay of PWA subassemblies.
Link to issue capturing the order from other vendors of balance of BOM for PWAs.
Parts
215| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | 330R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R110, R112, R202, R204, R206, R208, R210, R401, R402, R403, R404, R501, R502, R503, R509, R1008 +10 |
| 24 | 4K7 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R201, R203, R205, R207, R209, R217, R301, R302, R303, R311, R312, R313, R315, R316, R318, R319 +8 |
| 17 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C103, C105, C108, C116, C117, C301, C303, C501, C503, C504, C602, C701, C702, C703, C704, C1100 +1 |
| 12 | DNI | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R106, R107, R306, R308, R314, R317, R320, R323, R407, R408, R707, R708 |
| 11 | 1R0 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R101, R213, R216, R305, R307, R309, R310, R512, R711, R1002, R1009 |
| 9 | 47uF 16V | Capacitor_SMD:CP_Elec_5x5.4 | C102, C106, C109, C115, C118, C302, C502, C505, C705 |
| 7 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R102, R214, R215, R603, R1003, R1004, R1005 |
| 7 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q301, Q302, Q303, Q304, Q305, Q401, Q402 |
| 7 | MMBT2222A-7-F | Package_TO_SOT_SMD:SOT-23 | Q201, Q202, Q203, Q204, Q205, Q206, Q207 |
| 6 | U_Box_V104_General_Alarm_Device_LED_Standoff | GeneralPurposeAlarmDevicePCB:U_Box_V104_General_Alarm_Device_LED_Standoff | MF103, MF601, MF602, MF603, MF604, MF605 |
| 5 | LED_T1.75_CLEAR_WHITE | GeneralPurposeAlarmDevicePCB:LED_5mm_Radial | D201, D202, D203, D204, D205 |
| 4 | 39R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R113, R114, R115, R116 |
| 4 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D301, D302, D303, D304 |
| 4 | MountingHole_Pad_3.5mm | GeneralPurposeAlarmDevicePCB:MountingHole_3.5mm_Pad_Via | H101, H102, H103, H104 |
| 4 | TP_GND | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP101, TP104, TP105, TP106 |
| 3 | 0.100_2Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J102, J103, J602 |
| 3 | Schottky 2A | GeneralPurposeAlarmDevicePCB:D_SMB_POLARITY | D101, D103, D104 |
| 3 | ToolingHole_Pad_1.152mm | GeneralPurposeAlarmDevicePCB:JLC_ToolingHole_0576mm | T101, T102, T103 |
| 2 | 5K1 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R211, R212 |
| 2 | Conn_01x14 1mm | Connector_PinSocket_1.00mm:PinSocket_1x14_P1.00mm_Vertical | J104, J106 |
| 2 | Polyfuse_Small_1A | Fuse:Fuse_0603_1608Metric | F101, F401 |
| 2 | SWITCH_TACTILE_SPST-NO_0.05A_24V | GeneralPurposeAlarmDevicePCB:Switch_Tactile_THT_6x6mm | S101, S102 |
| 1 | +12in | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP302 |
| 1 | +5V | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP103 |
| 1 | +5esp32 | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | +5esp32 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R304 |
| 1 | 1X2P 1.25 mm Header | GeneralPurposeAlarmDevicePCB:Molex_PicoBlade_53047-0210_1x02_P1.25mm_Vertical | J601 |
| 1 | 2mm_2Pin | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J604 |
| 1 | 39pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C101 |
| 1 | 3V3USB | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP205 |
| 1 | 3v3Controller | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP109 |
| 1 | 5VDFP | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP501 |
| 1 | 5VRaw | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP306 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U103 |
| 1 | Barrel_Jack_Switch_SMT | GeneralPurposeAlarmDevicePCB:BarrelJack_CLIFF_FC681465S_SMT_Horizontal | J101 |
| 1 | CH340B | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U501 |
| 1 | CIPO | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP301 |
| 1 | COPI | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP304 |
| 1 | Conn_01x10 1mm | Connector_PinSocket_1.00mm:PinSocket_1x10_P1.00mm_Vertical | J107 |
| 1 | Conn_01x16 | Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical | U303 |
| 1 | DE9_Receptacle_MountingHoles | Connector_Dsub:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset9.90mm_Housed_MountingHolesOffset11.32mm | J701 |
| 1 | DFPlayermini | GeneralPurposeAlarmDevicePCB:DFPlayer_mini_20241116 | J603 |
| 1 | ESP32-WROOM-32E-N4 | GeneralPurposeAlarmDevicePCB:ESP32-WROOM-32D | U102 |
| 1 | IEC_power_polarity_symbols_barrel_jack_Center_positive | GeneralPurposeAlarmDevicePCB:Symbol_Barrel_Polarity_Center_Positive | SYM102 |
| 1 | LCD_20x4_Character-GPAD_SCH_LIB | GeneralPurposeAlarmDevicePCB:LCD_2004A | U302 |
| 1 | LED_T1.75_CLEAR_RED | GeneralPurposeAlarmDevicePCB:LED_5mm_Radial | D105 |
| 1 | LM7805_TO220 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U101 |
| 1 | LOGO | GeneralPurposeAlarmDevicePCB:Logo_PI_BandW_70percent_10x10 | G*** |
| 1 | Logo_Open_Hardware_Small | Symbol:OSHW-Logo2_7.3x6mm_SilkScreen | SYM101 |
| 1 | MAX3232 | Package_SO:SOIC-16_4.55x10.3mm_P1.27mm | U701 |
| 1 | PCF8574AT_3_518 | Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm | U301 |
| 1 | POT 0.375 10K | GeneralPurposeAlarmDevicePCB:Potentiometer_Bourns_3386P_Vertical | RV301 |
| 1 | RED 0603 | LED_SMD:LED_0603_1608Metric | D501 |
| 1 | RED 0603 | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D106 |
| 1 | RJ12_6P6C_HORZ | GeneralPurposeAlarmDevicePCB:RJ12_Amphenol_54601 | J401 |
| 1 | RotaryEncoder_Switch | GeneralPurposeAlarmDevicePCB:RotaryEncoder_Alps_EC12E-Switch_Vertical_H20mm_MP1_MP2 | SW101 |
| 1 | SCK | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP303 |
| 1 | SCL | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP403 |
| 1 | SDA | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP404 |
| 1 | SS | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP305 |
| 1 | SWITCH_TACTILE_12mmx12mm_SPST-NO_0.05A_24V | GeneralPurposeAlarmDevicePCB:SW_PUSH-12mm_WithCap_Green | S601 |
| 1 | TP+3.3V | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP100 |
| 1 | U0_RX | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP108 |
| 1 | U0_TX | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP206 |
| 1 | USB_C_Receptacle_USB2.0 | GeneralPurposeAlarmDevicePCB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J501 |
| 1 | V3 | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP202 |
| 1 | VBus | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP201 |
| 1 | Vcc_LCD | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP401 |
| 1 | Vcontrast | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP405 |
| 1 | Vin | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP102 |
| 1 | nCTS | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP203 |
| 1 | nINT | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP402 |
| 1 | nRST | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP204 |
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Questions
How big is the PWA REV2 PCB?
It measures 137.2 × 83.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PWA REV2 use?
215 parts, built around the CH340B, ESP32-WROOM-32E-N4, MAX3232ID and AMS1117-3.3. 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 PWA REV2 KiCad files?
From the PubInv/krake repository on GitHub, at the commit this page was made from: the board is PWA_REV2/PWA_REV2.kicad_pcb and its schematic PCBa_KRAKE/AlarmAudio.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PWA REV2 design in my own project?
Its repository publishes it under the AGPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).