# ESP32 Environmental Controller

## Description

Low\-cost 5 V ESP32 environmental controller with I2C and 1\-Wire sensor interfaces, four 5 V logic outputs, and four 200 mA low\-side load channels, optimized for 2\-layer JLCPCB Economic PCBA\.

## Project Details

- **Owner:** datexa25
- **Created:** 9/16/2026
- **Last Updated:** 9/18/2026
- **Visibility:** Public

## Key Components

### D1 — [SS14\_R1\_00001](https://flux.ai/lcsc/ss14r100001~ad55.md)

- LCSC Part Number: C124751
- Role Details: 1 A Schottky clamp from LOAD1 anode to 5 V cathode
- Product Info Url: https://lcsc\.com/product\-detail/Schottky\-Barrier\-Diodes\-SBD\_ss14\_C124751\.html
- Part Type: Schottky Barrier Diodes \(SBD\)
- JLCPCB Part Class: Extended Part
- Functional Group: Low\-Side Load Outputs
- Manufacturer Name: PANJIT\(强茂\)
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_PANJIT\-International\-SS14\-R1\-00001\_C124751\.pdf
- Manufacturer Part Number: SS14\_R1\_00001
- Package or Case Code: SMA\_L4\.4\-W2\.8\-LS5\.4\-RD
- Role: Flyback / Freewheeling

**Pins:**
- A [pin 2]
- K [pin 1]

### D2 — [SS14\_R1\_00001](https://flux.ai/lcsc/ss14r100001~ad55.md)

- Functional Group: Low\-Side Load Outputs
- LCSC Part Number: C124751
- Product Info Url: https://lcsc\.com/product\-detail/Schottky\-Barrier\-Diodes\-SBD\_ss14\_C124751\.html
- Part Type: Schottky Barrier Diodes \(SBD\)
- Role Details: 1 A Schottky clamp from LOAD2 anode to 5 V cathode
- JLCPCB Part Class: Extended Part
- Manufacturer Name: PANJIT\(强茂\)
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_PANJIT\-International\-SS14\-R1\-00001\_C124751\.pdf
- Manufacturer Part Number: SS14\_R1\_00001
- Package or Case Code: SMA\_L4\.4\-W2\.8\-LS5\.4\-RD
- Role: Flyback / Freewheeling

**Pins:**
- A [pin 2]
- K [pin 1]

### D3 — [SS14\_R1\_00001](https://flux.ai/lcsc/ss14r100001~ad55.md)

- LCSC Part Number: C124751
- Product Info Url: https://lcsc\.com/product\-detail/Schottky\-Barrier\-Diodes\-SBD\_ss14\_C124751\.html
- Role: Flyback / Freewheeling
- Part Type: Schottky Barrier Diodes \(SBD\)
- JLCPCB Part Class: Extended Part
- Manufacturer Name: PANJIT\(强茂\)
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_PANJIT\-International\-SS14\-R1\-00001\_C124751\.pdf
- Role Details: 1 A Schottky clamp from LOAD3 anode to 5 V cathode
- Functional Group: Low\-Side Load Outputs
- Manufacturer Part Number: SS14\_R1\_00001
- Package or Case Code: SMA\_L4\.4\-W2\.8\-LS5\.4\-RD

**Pins:**
- A [pin 2]
- K [pin 1]

### D4 — [SS14\_R1\_00001](https://flux.ai/lcsc/ss14r100001~ad55.md)

- LCSC Part Number: C124751
- Product Info Url: https://lcsc\.com/product\-detail/Schottky\-Barrier\-Diodes\-SBD\_ss14\_C124751\.html
- Part Type: Schottky Barrier Diodes \(SBD\)
- JLCPCB Part Class: Extended Part
- Manufacturer Name: PANJIT\(强茂\)
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_PANJIT\-International\-SS14\-R1\-00001\_C124751\.pdf
- Role Details: 1 A Schottky clamp from LOAD4 anode to 5 V cathode
- Manufacturer Part Number: SS14\_R1\_00001
- Functional Group: Low\-Side Load Outputs
- Package or Case Code: SMA\_L4\.4\-W2\.8\-LS5\.4\-RD
- Role: Flyback / Freewheeling

**Pins:**
- A [pin 2]
- K [pin 1]

### D5 — [SMF5\.0A](https://flux.ai/lcsc/smf5p0a~bz6b.md)

- Package or Case Code: SOD\-123FL\_L2\.8\-W1\.8\-LS3\.6\-RD
- JLCPCB Part Class: Extended Part
- Role: Clamping
- Breakdown Voltage: 6\.4V
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2990427\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNRTlBbUVFXRldaXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- LCSC Part Number: C2990427
- Diode Type: TVS Diode
- Part Type: TVS
- Max Output Voltage: 9\.2V
- Functional Group: USB\-C Power and Programming
- Max Reverse Voltage: 5V
- Role Details: SMF5\.0A unidirectional VBUS TVS: cathode pin 1 to fused 5V, anode pin 2 to GND; downstream of F1 so sustained clamp current is overcurrent\-limited
- Manufacturer Name: Liown\(里阳半导体\)
- Manufacturer Part Number: SMF5\.0A

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### F1 — [RXEF160](https://flux.ai/lcsc/rxef160~ezwn.md)

- Manufacturer Part Number: RXEF160
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_Littelfuse\-RXEF160\_C413563\.pdf
- Product Info Url: https://lcsc\.com/product\-detail/PTC\-Resettable\-Fuses\_Littelfuse\-RXEF160\_C413563\.html
- Role Details: RXEF160 PPTC: 1\.6 A hold at 20 C, selected above 1\.37 A calculated peak; derates with temperature and does not authorize USB host current
- LCSC Part Number: C413563
- Part Type: Resettable Fuses
- Functional Group: USB\-C Power and Programming
- JLCPCB Part Class: Extended Part
- Package or Case Code: FUSE\-TH\_L16\.3\-W3\.0\-P5\.10\-D0\.7\-S2\.50
- Manufacturer Name: Littelfuse\(美国力特\)
- Role: Protection

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J1 — [USB4215\-03\-A](https://flux.ai/adrian95/usb4215-03-a~kg3.md)

- Functional Group: USB\-C Power and Programming
- Datasheet URL: https://gct\.co/files/specs/usb4215\-spec\.pdf
- Part Type: USB C
- Symbol Style: parametric\-v1
- Package or Case Code: GCT\_USB4215\-03\-A\_REVA
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: GCT
- Role Details: GCT USB4215\-03\-A USB\-C USB 2\.0 sink/device receptacle; verified library footprint with 0\.5 mm SMT contacts, four through\-hole shell stakes, and board\-edge mating face
- Manufacturer Part Number: USB4215\-03\-A
- Role: Protection

**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- DN1 [pin A7]
- DN2 [pin B7]
- DP1 [pin A6]
- DP2 [pin B6]
- GND\_A [pin A1\_B12]
- GND\_B [pin B1\_A12]
- SBU1 [pin A8]
- SBU2 [pin B8]
- SHIELD [pin SH1]
- SHIELD [pin SH4]
- SHIELD [pin SH2]
- SHIELD [pin SH3]
- VBUS\_A [pin A4\_B9]
- VBUS\_B [pin B4\_A9]

### J2 — [JL2EDGVC\-50804G01](https://flux.ai/lcsc/jl2edgvc-50804g01~hhnh.md)

- JLCPCB Part Class: Extended Part
- Part Type: Pluggable System Terminal Block
- Product Info Url: https://lcsc\.com/product\-detail/Pluggable\-System\-Terminal\-Block\_JILN\-JL2EDGVC\-50804G01\_C409144\.html
- Role: I2C Interface
- Manufacturer Part Number: JL2EDGVC\-50804G01
- Role Details: 3V3 GND SDA SCL field terminal
- Package or Case Code: CONN\-TH\_4P\-P5\.08\_JL2EDGVC\-50804G01
- Manufacturer Name: JILN\(锦凌\)
- Functional Group: Sensor Interfaces
- Exclude from Pick & Place: true
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010031\_JILN\-JL2EDGVC\-50804G01\_C409144\.pdf
- LCSC Part Number: C409144

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J3 — [JL2EDGVC\-50804G01](https://flux.ai/lcsc/jl2edgvc-50804g01~hhnh.md)

- JLCPCB Part Class: Extended Part
- Part Type: Pluggable System Terminal Block
- Product Info Url: https://lcsc\.com/product\-detail/Pluggable\-System\-Terminal\-Block\_JILN\-JL2EDGVC\-50804G01\_C409144\.html
- Manufacturer Part Number: JL2EDGVC\-50804G01
- Functional Group: 5V Logic Outputs
- Package or Case Code: CONN\-TH\_4P\-P5\.08\_JL2EDGVC\-50804G01
- Manufacturer Name: JILN\(锦凌\)
- Exclude from Pick & Place: true
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010031\_JILN\-JL2EDGVC\-50804G01\_C409144\.pdf
- Role Details: Four buffered 5 V logic outputs
- Role: Logic Outputs
- LCSC Part Number: C409144

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J4 — [JL2EDGVC\-50804G01](https://flux.ai/lcsc/jl2edgvc-50804g01~hhnh.md)

- JLCPCB Part Class: Extended Part
- Role Details: Four low\-side switched load terminals
- Role: Load Outputs
- Part Type: Pluggable System Terminal Block
- Product Info Url: https://lcsc\.com/product\-detail/Pluggable\-System\-Terminal\-Block\_JILN\-JL2EDGVC\-50804G01\_C409144\.html
- Manufacturer Part Number: JL2EDGVC\-50804G01
- Package or Case Code: CONN\-TH\_4P\-P5\.08\_JL2EDGVC\-50804G01
- Manufacturer Name: JILN\(锦凌\)
- Exclude from Pick & Place: true
- Functional Group: Low\-Side Load Outputs
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010031\_JILN\-JL2EDGVC\-50804G01\_C409144\.pdf
- LCSC Part Number: C409144

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J5 — [Pin Header 01x03 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md)

- Role Details: Unpopulated 3V3 GND DATA header
- Role: 1\-Wire Interface
- Allow Substitutes: Yes
- Exclude from Pick & Place: true
- Functional Group: Sensor Interfaces
- Part Type: Connector
- Manufacturer Name: Harwin
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: M20\-9990345

**Pins:**
- Pin\_1 [pin 1]
- Pin\_2 [pin 2]
- Pin\_3 [pin 3]

### Q1 — [S8050](https://flux.ai/adrian95/s8050~wjp.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor
- Role: Low\-Side Switch
- Role Details: 200 mA load channel NPN transistor
- Manufacturer Part Number: S8050
- Functional Group: Low\-Side Load Outputs
- Datasheet URL: https://pdf1\.alldatasheet\.com/datasheet\-pdf/view/33773/WINGS/S8050\.html
- LCSC Part Number: C2146
- Manufacturer Name: MDD

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### Q2 — [S8050](https://flux.ai/adrian95/s8050~wjp.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor
- Role Details: 200 mA load channel NPN transistor
- Functional Group: Low\-Side Load Outputs
- LCSC Part Number: C2146
- Manufacturer Part Number: S8050
- Datasheet URL: https://pdf1\.alldatasheet\.com/datasheet\-pdf/view/33773/WINGS/S8050\.html
- Role: Low\-Side Switch
- Manufacturer Name: MDD

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### Q3 — [S8050](https://flux.ai/adrian95/s8050~wjp.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor
- Role Details: 200 mA load channel NPN transistor
- Functional Group: Low\-Side Load Outputs
- Role: Low\-Side Switch
- Manufacturer Part Number: S8050
- LCSC Part Number: C2146
- Datasheet URL: https://pdf1\.alldatasheet\.com/datasheet\-pdf/view/33773/WINGS/S8050\.html
- Manufacturer Name: MDD

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### Q4 — [S8050](https://flux.ai/adrian95/s8050~wjp.md)

- Functional Group: Low\-Side Load Outputs
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor
- Role: Low\-Side Switch
- Role Details: 200 mA load channel NPN transistor
- Manufacturer Part Number: S8050
- Datasheet URL: https://pdf1\.alldatasheet\.com/datasheet\-pdf/view/33773/WINGS/S8050\.html
- LCSC Part Number: C2146
- Manufacturer Name: MDD

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### Q5 — [MMBT3904LT3G](https://flux.ai/lcsc/mmbt3904lt3g~77v1.md)

- Role: Switching
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1810301515\_onsemi\-MMBT3904LT3G\_C150052\.pdf
- Package or Case Code: SOT\-23\-3\_L2\.9\-W1\.3\-P1\.90\-LS2\.4\-BR
- LCSC Part Number: C150052
- Part Type: Bipolar Transistors \- BJT
- Manufacturer Name: onsemi\(安森美\)
- Product Info Url: https://lcsc\.com/product\-detail/Transistors\-NPN\-PNP\_ON\-Semicon\_MMBT3904LT3G\_ON\-Semicon\-ON\-MMBT3904LT3G\_C150052\.html
- Functional Group: USB\-C Power and Programming
- Manufacturer Part Number: MMBT3904LT3G
- Role Details: Espressif cross\-coupled NPN stage controlling EN from RTS\#/DTR\#
- JLCPCB Part Class: Extended Part

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### Q6 — [MMBT3904LT3G](https://flux.ai/lcsc/mmbt3904lt3g~77v1.md)

- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1810301515\_onsemi\-MMBT3904LT3G\_C150052\.pdf
- Package or Case Code: SOT\-23\-3\_L2\.9\-W1\.3\-P1\.90\-LS2\.4\-BR
- LCSC Part Number: C150052
- Role: Switching
- Part Type: Bipolar Transistors \- BJT
- Role Details: Espressif cross\-coupled NPN stage controlling IO0 from DTR\#/RTS\#
- Manufacturer Name: onsemi\(安森美\)
- Product Info Url: https://lcsc\.com/product\-detail/Transistors\-NPN\-PNP\_ON\-Semicon\_MMBT3904LT3G\_ON\-Semicon\-ON\-MMBT3904LT3G\_C150052\.html
- Manufacturer Part Number: MMBT3904LT3G
- Functional Group: USB\-C Power and Programming
- JLCPCB Part Class: Extended Part

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### SW1 — [TS\-1187A\-B\-A\-B](https://flux.ai/lcsc/ts-1187a-b-a-b~2qda.md)

- Product Info Url: https://lcsc\.com/product\-detail/Tactile\-Switches\_XKB\-Enterprise\-TS\-1187\-B\-A\-A\_C318884\.html
- Role Details: Manual ESP32 reset button
- Functional Group: MCU and Programming
- JLCPCB Part Class: Basic Part
- LCSC Part Number: C318884
- Role: Reset Control
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_XKB\-Connection\-TS\-1187A\-B\-A\-B\_C318884\.pdf
- Part Type: Tactile Switches
- Package or Case Code: SW\-SMD\_4P\-L5\.1\-W5\.1\-P3\.70\-LS6\.5\-TL\-2
- Manufacturer Name: XKB Connectivity\(中国星坤\)
- Manufacturer Part Number: TS\-1187A\-B\-A\-B

**Pins:**
- A [pin 1]
- B [pin 2]
- C [pin 3]
- D [pin 4]

### SW2 — [TS\-1187A\-B\-A\-B](https://flux.ai/lcsc/ts-1187a-b-a-b~2qda.md)

- Product Info Url: https://lcsc\.com/product\-detail/Tactile\-Switches\_XKB\-Enterprise\-TS\-1187\-B\-A\-A\_C318884\.html
- JLCPCB Part Class: Basic Part
- Functional Group: MCU and Programming
- LCSC Part Number: C318884
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_XKB\-Connection\-TS\-1187A\-B\-A\-B\_C318884\.pdf
- Part Type: Tactile Switches
- Package or Case Code: SW\-SMD\_4P\-L5\.1\-W5\.1\-P3\.70\-LS6\.5\-TL\-2
- Role Details: Manual ESP32 bootloader button
- Role: Boot Control
- Manufacturer Name: XKB Connectivity\(中国星坤\)
- Manufacturer Part Number: TS\-1187A\-B\-A\-B

**Pins:**
- A [pin 1]
- B [pin 2]
- C [pin 3]
- D [pin 4]

### U1 — [ESP32\-WROOM\-32D](https://flux.ai/vasy_skral/esp32-wroom-32d~o5t.md)

- Role Details: ESP32 Wi\-Fi/Bluetooth MCU module
- Datasheet URL: https://www\.espressif\.com/sites/default/files/documentation/esp32\-wroom\-32d\_esp32\-wroom\-32u\_datasheet\_en\.pdf
- LCSC Part Number: C70134
- Role: Controller
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Espressif Systems
- Manufacturer Part Number: ESP32\-WROOM\-32D
- Functional Group: MCU and Programming
- Symbol Style: parametric\-v1
- Part Type: Module

**Pins:**
- 3V3 [pin 2]
- EN [pin 3]
- GND [pin 39\_16]
- GND [pin 39\_14]
- GND [pin 1]
- GND [pin 39\_17]
- GND [pin 15]
- GND [pin 39\_12]
- GND [pin 39\_11]
- GND [pin 39\_5]
- GND [pin 39\_3]
- GND [pin 39\_13]
- GND [pin 39\_21]
- GND [pin 38]
- GND [pin 39\_10]
- GND [pin 39\_19]
- GND [pin 39\_1]
- GND [pin 39\_6]
- GND [pin 39\_9]
- GND [pin 39\_18]
- GND [pin 39\_20]
- GND [pin 39\_7]
- GND [pin 39\_8]
- GND [pin 39\_4]
- GND [pin 39\_15]
- GND [pin 39\_2]
- IO0 [pin 25]
- IO12 [pin 14]
- IO13 [pin 16]
- IO14 [pin 13]
- IO15 [pin 23]
- IO16 [pin 27]
- IO17 [pin 28]
- IO18 [pin 30]
- IO19 [pin 31]
- IO2 [pin 24]
- IO21 [pin 33]
- IO22 [pin 36]
- IO23 [pin 37]
- IO25 [pin 10]
- IO26 [pin 11]
- IO27 [pin 12]
- IO32 [pin 8]
- IO33 [pin 9]
- IO34 [pin 6]
- IO35 [pin 7]
- IO4 [pin 26]
- IO5 [pin 29]
- RXD0 [pin 34]
- SCK/CLK [pin 20]
- SCS/CMD [pin 19]
- SDI/SD1 [pin 22]
- SDO/SD0 [pin 21]
- SENSOR\_VN [pin 5]
- SENSOR\_VP [pin 4]
- SHD/SD2 [pin 17]
- SWP/SD3 [pin 18]
- TXD0 [pin 35]

### U2 — [AMS1117\-3\.3](https://flux.ai/adrian95/ams1117-33~v2u.md)

- Manufacturer Part Number: AMS1117\-3\.3
- Role Details: 5 V to 3\.3 V linear regulator
- LCSC Part Number: C6186
- Role: Voltage Regulation
- Functional Group: Power Supply
- Datasheet URL: https://www\.snapeda\.com/parts/AMS1117\-3\.3/Advanced%20Monolithic%20Systems/view\-part/?ref=search&t=AMS1117\-3\.3
- Manufacturer Name: ams
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Integrated Circuit

**Pins:**
- GND [pin 1]
- VI [pin 3]
- VO [pin 2]

### U7 — [SN74AHCT125DR](https://flux.ai/lcsc/sn74ahct125dr~kfnt.md)

- Role: Logic Buffer
- Part Type: Buffers / Drivers
- JLCPCB Part Class: Extended Part
- Role Details: Four 3\.3 V logic inputs to 5 V outputs
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1809051431\_Texas\-Instruments\-SN74AHCT125DR\_C155176\.pdf
- Package or Case Code: SOIC\-14\_L8\.7\-W3\.9\-P1\.27\-LS6\.0\-BL
- Product Info Url: https://lcsc\.com/product\-detail/74\-Series\_TI\_SN74AHCT125DR\_SN74AHCT125DR\_C155176\.html
- Manufacturer Part Number: SN74AHCT125DR
- Manufacturer Name: TI\(德州仪器\)
- LCSC Part Number: C155176
- Functional Group: 5V Logic Outputs

**Pins:**
- \~\{1OE\} [pin 1]
- \~\{2OE\} [pin 4]
- \~\{3OE\} [pin 10]
- \~\{4OE\} [pin 13]
- 1A [pin 2]
- 1Y [pin 3]
- 2A [pin 5]
- 2Y [pin 6]
- 3A [pin 9]
- 3Y [pin 8]
- 4A [pin 12]
- 4Y [pin 11]
- GND [pin 7]
- VCC [pin 14]

### U8 — [FT231XS\-R](https://flux.ai/lcsc/ft231xs-r~da5d.md)

- Product Info Url: https://lcsc\.com/product\-detail/USB\_FTDI\_FT231XS\-R\_FT231XS\-R\_C132160\.html
- Manufacturer Name: FTDI\(飞特帝亚\)
- Part Type: USB ICs
- Package or Case Code: SSOP\-20\_L8\.6\-W3\.9\-P0\.64\-LS6\.0\-BL
- JLCPCB Part Class: Extended Part
- Manufacturer Part Number: FT231XS\-R
- Role Details: FT231XS\-R USB\-to\-UART bridge; USBDP/USBDM connect directly through U9 \(no external series resistors specified by FTDI\); RESET\# pin 14 tied to VCCIO/3V3OUT; 3\.3 V UART I/O and DTR\#/RTS\# auto\-flash
- Functional Group: USB\-C Power and Programming
- LCSC Part Number: C132160
- Datasheet URL: https://ftdichip\.com/wp\-content/uploads/2024/05/DS\_FT231X\.pdf
- Role: Logic\-level Shifting

**Pins:**
- \~\{CTS\} [pin 9]
- \~\{DCD\} [pin 8]
- \~\{DSR\} [pin 7]
- \~\{DTR\} [pin 1]
- \~\{RESET\} [pin 14]
- \~\{RI\} [pin 5]
- \~\{RTS\} [pin 2]
- 3V3OUT [pin 13]
- CBUS0 [pin 18]
- CBUS1 [pin 17]
- CBUS2 [pin 10]
- CBUS3 [pin 19]
- GND [pin 16]
- GND [pin 6]
- RXD [pin 4]
- TXD [pin 20]
- USBDM [pin 12]
- USBDP [pin 11]
- VCC [pin 15]
- VCCIO [pin 3]

### U9 — [USBLC6\-2SC6](https://flux.ai/vasy_skral/usblc6-2sc6~g1b.md)

- Role Details: ST USBLC6\-2SC6 flow\-through low\-capacitance USB 2\.0 D\+/D\- ESD array; connector on pins 1/3, FT231X on pins 6/4, VBUS pin 5 referenced to fused 5V
- Manufacturer Part Number: USBLC6\-2SC6
- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Protection
- Role: Protection
- Manufacturer Name: STMicroelectronics
- Datasheet URL: https://www\.st\.com/content/ccc/resource/technical/document/datasheet/06/1d/48/9c/6c/20/4a/b2/CD00050750\.pdf/files/CD00050750\.pdf/jcr:content/translations/en\.CD00050750\.pdf
- LCSC Part Number: C7519
- Functional Group: USB\-C Power and Programming

**Pins:**
- GND [pin 2]
- I/O1 [pin 6]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O2 [pin 4]
- VBUS [pin 5]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/datexa25/esp32\-environmental\-controller\~ro](https://flux.ai/datexa25/esp32-environmental-controller~ro).*

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*Generated from [https://flux\.ai/datexa25/esp32\-environmental\-controller\~ro](https://flux.ai/datexa25/esp32-environmental-controller~ro)*