# [Example] ESP32 Reference Design ## Description An example development and reference design for the ESP32 microcontroller. ## Project Details - **Owner:** tocasoft - **Created:** 1/3/2022 - **Last Updated:** 8/3/2024 - **Visibility:** Public ## Key Components ### A0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### A1 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### A2 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### A3 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### A4 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### A5 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### A6 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### A7 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### AIN0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### AIN1 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### AIN2 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### AIN3 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B1 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B2 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B3 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B4 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B5 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B6 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### B7 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### D1 — [Schottky Diode](https://www.flux.ai/lwcassid/schottky-diode.md) - Saturation Current: 3.15e-7A - Series Resistance: 2.8Ω - Breakdown Voltage: 70V - Emission Coefficient: 2.03 **Pins:** - ANODE - CATHODE ### DTS — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_CLK — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_CMD — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_EN — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_EN — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_EN — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO12 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO13 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO14 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO15 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO16 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO17 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO18 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO19 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO2 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO2 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO23 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO25 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO26 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO27 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO32 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO33 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO34 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO35 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO36 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO39 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO4 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO5 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_IO5 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_RX — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_RX — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_SD0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_SD1 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_SD2 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_SD3 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_TX — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_TX — Label - Pin Type: Signal **Pins:** - P1 - P2 ### ESP_TX — Label - Pin Type: Signal **Pins:** - P1 - P2 ### J1 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J10 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J11 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J12 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J13 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J14 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J15 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J2 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J3 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J4 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J5 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J6 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J7 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J8 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### J9 — [Connector 01x04 Horizontal](https://www.flux.ai/jharwinbarrozo/connector-01x04-horizontal.md) - Part Type: Connector **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### PWM0 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM1 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM10 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM11 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM12 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM13 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM14 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM15 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM2 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM3 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM4 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM5 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM6 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM7 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM8 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### PWM9 — Label - Pin Type: Signal **Pins:** - P1 - P2 ### RST — Label - Pin Type: Signal **Pins:** - P1 - P2 ### S1 — [Push Button](https://www.flux.ai/jharwinbarrozo/push-button.md) - Manufacturer Name: OMRON - Part Type: Switch - Manufacturer Part Number: B3FS-1050P - Datasheet URL: https://datasheet.lcsc.com/lcsc/1809271215_Omron-Electronics-B3FS-1050P_C231326.pdf **Pins:** - P1 [pin 1] - P2 [pin 3] ### S2 — [Push Button](https://www.flux.ai/jharwinbarrozo/push-button.md) - Datasheet URL: https://datasheet.lcsc.com/lcsc/1809271215_Omron-Electronics-B3FS-1050P_C231326.pdf - Manufacturer Part Number: B3FS-1050P - Part Type: Switch - Manufacturer Name: OMRON **Pins:** - P1 [pin 1] - P2 [pin 3] ### SCL — Label - Pin Type: Signal **Pins:** - P1 - P2 ### SCL — Label - Pin Type: Signal **Pins:** - P1 - P2 ### SCL — Label **Pins:** - P1 - P2 ### SCL — Label - Pin Type: Signal **Pins:** - P1 - P2 ### SDA — Label - Pin Type: Signal **Pins:** - P1 - P2 ### SDA — Label - Pin Type: Signal **Pins:** - P1 - P2 ### SDA — Label - Pin Type: Signal **Pins:** - P1 - P2 ### SDA — Label - Pin Type: Signal **Pins:** - P1 - P2 ### TP1 — [Test Point](https://www.flux.ai/ramprakashvishnoi8/test-point.md) **Pins:** - P1 ### TP2 — [Test Point](https://www.flux.ai/ramprakashvishnoi8/test-point.md) **Pins:** - P1 ### TP3 — [Test Point](https://www.flux.ai/ramprakashvishnoi8/test-point.md) **Pins:** - P1 ### TP4 — [Test Point](https://www.flux.ai/ramprakashvishnoi8/test-point.md) **Pins:** - P1 ### TP5 — [Test Point](https://www.flux.ai/ramprakashvishnoi8/test-point.md) **Pins:** - P1 ### TP6 — [Test Point](https://www.flux.ai/ramprakashvishnoi8/test-point.md) **Pins:** - P1 ### U1 — [ESP32-WROOM-32D](https://www.flux.ai/vasyl/esp32-wroom-32d.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - Part Type: Microcontroller - Package or Case Code: ESP32-WROOM-32 - Manufacturer Part Number: ESP32-WROOM-32D - Manufacturer Part Number: ESP32-WROOM-32 - Manufacturer Name: Espressif Systems **Pins:** - 3.3V [pin 2] - AGND [pin 39] - CLK [pin 20] - CMD [pin 19] - EN [pin 3] - GND [pin 38] - GND [pin 15] - GND [pin 1] - 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] - NC [pin 32] - RXD0 [pin 34] - SD0 [pin 21] - SD1 [pin 22] - SD2 [pin 17] - SD3 [pin 18] - TXD0 [pin 35] - VN [pin 5] - VP [pin 4] ### U2 — [MCP23017-E/SO](https://www.flux.ai/vasy_skral/mcp23017-eso.md) - Datasheet URL: http://www.microchip.com/mymicrochip/filehandler.aspx?ddocname=en023709 - Package or Case Code: 28-SOIC - Manufacturer Name: Microchip Technology - Part Type: Integrated Circuit - Manufacturer Part Number: MCP23017-E/SO **Pins:** - ~RESET - A0 - A1 - A2 - GPA0 - GPA1 - GPA2 - GPA3 - GPA4 - GPA5 - GPA6 - GPA7 - GPB0 - GPB1 - GPB2 - GPB3 - GPB4 - GPB5 - GPB6 - GPB7 - INTA - INTB - SCK - SDA - VDD - VSS ### U3 — [TPS564201DDCR](https://www.flux.ai/vasy_skral/tps564201ddcr.md) - Datasheet URL: http://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=http%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps564201 - Manufacturer Part Number: TPS564201DDCR - Part Type: Integrated Circuit - Package or Case Code: TSOT-23-6 - Manufacturer Name: Texas Instruments **Pins:** - EN - GND - SW - VBST - VFB - VIN ### U4 — [USB4110-GF-A_REVB](https://www.flux.ai/vasy_skral/usb4110-gf-arevb.md) - Package or Case Code: Surface Mount, Right Angle - Manufacturer Name: GCT - Manufacturer Part Number: USB4110-GF-A - Part Type: Connector - Datasheet URL: https://gct.co/files/drawings/usb4110.pdf **Pins:** - CC1 - CC2 - DN1 - DN2 - DP1 - DP2 - GND - GND - GND - GND - GND - GND - SBU1 - SBU2 - VBUS - VBUS ### U5 — [ADS1115IDGSR](https://www.flux.ai/vasy_skral/ads1115idgsr.md) - Manufacturer Name: Texas Instruments - Package or Case Code: 10-VSSOP - Manufacturer Part Number: ADS1115IDGSR - Part Type: Integrated Circuit - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fads1113 **Pins:** - ADDR - AIN0 - AIN1 - AIN2 - AIN3 - ALERT/RDY - GND - SCL - SDA - VDD ### U6 — [CP2102N-A02-GQFN28](https://www.flux.ai/vasyl/cp2102n-a02-gqfn28.md) - Package or Case Code: CP2102N-A02-GQFN28 - Manufacturer Name: Silicon Labs - Part Type: Integrated Circuit - Manufacturer Part Number: CP2102N-A02-GQFN28 - Datasheet URL: https://www.silabs.com/documents/public/data-sheets/cp2102n-datasheet.pdf **Pins:** - ~RST [pin 9] - CHR0 [pin 15] - CHR1 [pin 14] - CHREN [pin 13] - CTS [pin 23] - D- [pin 5] - D+ [pin 4] - DCD [pin 1] - DSR [pin 27] - DTR [pin 28] - GND [pin 3] - GND [pin 29] - GPIO.4 [pin 22] - GPIO.5 [pin 21] - GPIO.6 [pin 20] - NC [pin 10] - RI/CLK [pin 2] - RS485/GPIO.2 [pin 17] - RTS [pin 24] - RXD [pin 25] - RXT/GPIO.1 [pin 18] - SUSPEND [pin 12] - SUSPENDb [pin 11] - TXD [pin 26] - TXT/GPIO.0 [pin 19] - USB [pin 8] - VDD [pin 6] - VREGIN [pin 7] - WAKEUP/GPIO.3 [pin 16] ### U7 — [PCA9685PW,118](https://www.flux.ai/vasy_skral/pca9685pwc118-old.md) - Package or Case Code: 28-TSSOP - Manufacturer Part Number: PCA9685PW,118 - Manufacturer Name: NXP - Manufacturer Part Number: PCA9685PW,118 - Datasheet URL: https://www.nxp.com/docs/en/data-sheet/PCA9685.pdf - Part Type: Integrated Circuit **Pins:** - ~OE - A0 - A1 - A2 - A3 - A4 - A5 - EXTCLK - LED0 - LED1 - LED10 - LED11 - LED12 - LED13 - LED14 - LED15 - LED2 - LED3 - LED4 - LED5 - LED6 - LED7 - LED8 - LED9 - SCL - SDA - VDD - VSS ### USB_D- — Label **Pins:** - P1 - P2 ### USB_D- — Label **Pins:** - P1 - P2 ### USB_D- — Label **Pins:** - P1 - P2 ### USB_D+ — Label **Pins:** - P1 - P2 ### USB_D+ — Label **Pins:** - P1 - P2 ### USB_D+ — Label **Pins:** - P1 - P2 *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/tocasoft/example-esp32-reference-design](https://www.flux.ai/tocasoft/example-esp32-reference-design).* --- *Generated from [https://www.flux.ai/tocasoft/example-esp32-reference-design](https://www.flux.ai/tocasoft/example-esp32-reference-design)*