How to Draw Circuit Schematic Diagram

ESP32 Demo Board V2 Schematic Circuit Diagram


One of the first feature-rich evaluation boards that contain several pin headers, dip switches, USB to the serial programming interface, reset and boot mode press buttons, power switch, 10 touch pads, and a separate header to connect the LCD screen.

ESP32 Demo Board at first glance

The header leading to the SDIO interface looks suspiciously mismatched in length for a high-speed bus. But probably not a concern at all, assuming it is properly terminated. It would probably operate at a maximum of 20 MHz in practice anyway!

The touch pads are something new as well. We have not come across too many SoCs that integrate a touchpad interface along with so many other analog+digital peripherals.

The ESP32 supports a debugger interface, probably JTAG – but there is no obvious support for that on this board, from what can be seen in the photos. Will have to wait until the official specs are out!

For now, it seems as if the primary purpose of the ESP32 Demo Board is to serve as a kit for testing the physical interfaces and protocols. Also, because of the simple nature of the demo board, it will be very easy to track power consumption down at the individual pin level. This is very critical for the type of applications ESP32 will be used for.

What IoTBits will do about this

It is great to have the development board provide an explicit LCD interface attachment. This means that the ESP32 is expected to handle graphics in addition to networking tasks. That is justified, considering the rich peripheral set and hardware specifications of the ESP32. Expect a graphics library from IoTBits for the ESP32 (and the ESP8266, if possible) very soon! Also, we at IoTBits expect to receive the modules + development board soon as well.
ESP32 Demo Board V2 Schematic Circuit

Schematic Diagram:

ESP32 Demo Board V2 Schematic Diagram


  • Single-core Xtensa LX7 CPU, up to 240 MHz
  • 320 KiB SRAM, 128 KiB ROM, and 16 KiB RTC SRAM
  • WiFi 2.4 GHz (IEEE 802.11b/g/n)
  • No Bluetooth
  • 43 programmable GPIOs

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