# USB-C WiFi BLE Environmental Sensor Node b4cb ## Description Low-power consumer temperature and humidity sensor node using USB-C 5 V input, protected power path, ESP32 Wi-Fi/BLE connectivity, and a digital T/RH sensor. ## Project Details - **Owner:** hananaaa - **Created:** 5/19/2026 - **Last Updated:** 5/19/2026 - **Visibility:** Public - **Power Requirements:** USB-C 5 V sink; default Type-C current, compatible with 0.5 A to 3 A sources; protected by OVP/UVLO/OCP/reverse-current input stage and regulated 3.3 V rail. - **Human Interface:** USB-C power/programming, boot/reset buttons, status LED - **Connectivity:** 2.4 GHz Wi-Fi 802.11 b/g/n plus Bluetooth Low Energy 5.x - **Domain:** Consumer environmental sensing / IoT - **Implementation Details:** Digital temperature/relative humidity sensor on I2C; low-power ESP32-class module with native USB; protected USB-C VBUS path; 3.3 V regulator sized for Wi-Fi transmit current. - **Operating Voltage:** 5V ## Key Components ### dc 솔배 — [CX240D5](https://www.flux.ai/cherepanyadima/cx240d5~6r.md) - Manufacturer Part Number: CX240D5 - Operating Voltage: 24V - Manufacturer Name: Sensata-Crydom - Datasheet URL: https://www.snapeda.com/search/?q=4-SIP&search-type=parts - Role Details: PLC Y2 sink output drives SSR input; SSR load side switches AC L to V-1 Main Pump. - Role: Switching - Part Type: Relay **Pins:** - -DC [pin 4] - +DC [pin 3] - AC_A [pin 1] - AC_B [pin 2] ### J_AC_IN — [TerminalBlock-01x02P-5.00mm](https://www.flux.ai/vasy_skral/terminalblock-01x02p-500mm~h4.md) - Role: Power Input - Role Details: 220VAC L/N incoming terminals. Wire colors: Black=AC L, Blue=AC N. - Operating Voltage: 220V - Part Type: Connector **Pins:** - P1 [pin 2] - P2 [pin 1] ### J_RS485 — [TerminalBlock-01x02P-5.00mm](https://www.flux.ai/vasy_skral/terminalblock-01x02p-500mm~h4.md) - Role: Interface - Part Type: Connector - Role Details: RS-485 RDA/RDB for Turbidity Sensor. Yellow wires for signals. **Pins:** - P1 [pin 2] - P2 [pin 1] ### K2 — [SPDT SRD Series Form C](https://www.flux.ai/jharwinbarrozo/spdt-srd-series-form-c~yz.md) - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811021933_Ningbo-Songle-Relay-SRD-05VDC-SL-C_C35449.pdf - Part Type: Switch - Manufacturer Part Number: SRD-05VDC-SL-C - Manufacturer Name: Ningbo Songle Relay **Pins:** - A - B - COM - L1 - L2 ### PB_START 스위치 — [Tactile Switch SPST-NO](https://www.flux.ai/collinsemasi/tactile-switch-spst-no~p4.md) - Datasheet URL: https://www.ckswitches.com/media/2780/pts526.pdf - Manufacturer Name: C&K - Role Details: NO Start pushbutton contact: +24V to PLC X0 when pressed. - Manufacturer Part Number: PTS526 SK15 SMTR2 LFS - Role: Switching **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### PB_STOP — [Tactile Switch SPST-NO](https://www.flux.ai/collinsemasi/tactile-switch-spst-no~p4.md) - Manufacturer Name: C&K - Role: Switching - Datasheet URL: https://www.ckswitches.com/media/2780/pts526.pdf - Manufacturer Part Number: PTS526 SK15 SMTR2 LFS - Role Details: NO Stop pushbutton contact: +24V to PLC X1 when pressed. **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### PLC_IN — [282836-6](https://www.flux.ai/adrian95/282836-6~h9s.md) - Part Type: Connector - Role Details: PLC Inputs block: source input logic. Pins assigned in documentation: 1=+24V, 2=0V, 3=X0 Start, 4=X1 Stop, 5=X2 Temp 40C, 6=X3 Temp 43C. - License: https://creativecommons.org/licenses/by/4.0/ - Role: Interface - Manufacturer Part Number: 282836-6 - Manufacturer Name: TE Connectivity AMP Connectors - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1308389_EUROSTYLE_TERMINAL_BLOCKS&DocType=CS&DocLang=English **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### PLC_OUT — [282836-6](https://www.flux.ai/adrian95/282836-6~h9s.md) - Role: Interface - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: PLC Outputs block: sink output logic. Pins assigned in documentation: 1=+24V, 2=0V, 3=Y0 Pump SSR, 4=Y1 DC pump relay, 5=Y2 main pump SSR, 6=Y3 alarm relay. - Manufacturer Part Number: 282836-6 - Manufacturer Name: TE Connectivity AMP Connectors - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1308389_EUROSTYLE_TERMINAL_BLOCKS&DocType=CS&DocLang=English **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### RS 485 — [TerminalBlock-01x02P-5.00mm](https://www.flux.ai/vasy_skral/terminalblock-01x02p-500mm~h4.md) - Role Details: RS-485 RDA/RDB for Turbidity Sensor. Yellow wires for signals. - Part Type: Connector - Role: Interface **Pins:** - P1 [pin 2] - P2 [pin 1] ### SMPS — [IRM-30-24](https://www.flux.ai/adrian95/irm-30-24~vnr.md) - Role Details: 220VAC input to 24VDC output SMPS for PLC inputs, relay coils, SSR control, and DC loads. - Manufacturer Part Number: IRM-30-24 - Operating Voltage: 220V - Package or Case Code: IRM3024 - Max Output Voltage: 24V - Manufacturer Name: Mean Well - Max Current: 1.3A - Role: Power Conversion - Part Type: Power Source - Datasheet URL: https://www.meanwellusa.com/upload/pdf/IRM-30/IRM-30-spec.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - AC/L [pin 3] - AC/N [pin 4] - V- [pin 2] - V+ [pin 1] ### SSR_순환펌프 — [CX240D5](https://www.flux.ai/cherepanyadima/cx240d5~6r.md) - Role: Switching - Operating Voltage: 24V - Part Type: Relay - Role Details: PLC Y0 sink output drives SSR input; SSR load side switches AC L to P-101 Pump. - Manufacturer Part Number: CX240D5 - Datasheet URL: https://www.snapeda.com/search/?q=4-SIP&search-type=parts - Manufacturer Name: Sensata-Crydom **Pins:** - -DC [pin 4] - +DC [pin 3] - AC_A [pin 1] - AC_B [pin 2] ### 계측펌프 — [DC Motor](https://www.flux.ai/vasyl/dc-motor~ku.md) - Role: Load - Role Details: P-102 DC Pump, +24VDC load switched by K_P102 NO contact. - Operating Voltage: 24V **Pins:** - - - + ### 솔배 제어용 릴레이 — [SPDT SRD Series Form C](https://www.flux.ai/jharwinbarrozo/spdt-srd-series-form-c~yz.md) - Manufacturer Part Number: SRD-05VDC-SL-C - Part Type: Switch - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811021933_Ningbo-Songle-Relay-SRD-05VDC-SL-C_C35449.pdf - Manufacturer Name: Ningbo Songle Relay **Pins:** - A - B - COM - L1 - L2 ### 순환펌프 — [DC Motor](https://www.flux.ai/vasyl/dc-motor~ku.md) - Operating Voltage: 220V - Role: Load - Role Details: P-101 Pump, 220VAC load switched by SSR_P101. **Pins:** - - - + ### 히터 — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor~3e.md) - Resistance: 500Ω - Package: SMD_0603_1608Metric - Part Type: Resistor **Pins:** - P1 [pin 1] - P2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/hananaaa/usb-c-wifi-ble-environmental-sensor-node-b4cb~zw](https://www.flux.ai/hananaaa/usb-c-wifi-ble-environmental-sensor-node-b4cb~zw).* --- *Generated from [https://www.flux.ai/hananaaa/usb-c-wifi-ble-environmental-sensor-node-b4cb~zw](https://www.flux.ai/hananaaa/usb-c-wifi-ble-environmental-sensor-node-b4cb~zw)*