Public Domain
ESP WROOM 32 Breakout
A breakout board for Espressif's ESP32 module ESP-WROOM-32. The ESP32 is a powerful and low-cost Wifi/Bluetooth chip that enables great Internet-Of-Things applications. Studio Sophisti is using this chip in several projects, including a work-in-progress redesign of Ping
The ESP-WROOM-32 can be purchased directly from Espressif or from a distributor like Adafruit: https://www.adafruit.com/product/3320
The board contains reverse-voltage protections, 2 buttons (1 for reset and 1 for activating programming mode), and a diode on the RX line so the IC is 5V serial port compatible. Power it from a 3.0-3.3V power source. The design has been tested and works.
| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | RST | SW2 | SW2-4.0-6.0X3.0X2.5MM | 1 |
| 2 | 10u | C4 | C0603 | 1 |
| 3 | 10k | R2,R1 | R0603 | 2 |
| 4 | PROG | SW1 | SW2-4.0-6.0X3.0X2.5MM | 1 |
| 5 | ESP-WROOM-32 | U3 | ESP-WROOM-32 | 1 |
| 6 | DIODE'0805' | D1 | SOD-323 | 1 |
| 7 | M14 | JP1,JP2 | 1X14 | 2 |
| 8 | M06SILK_FEMALE_PTH | JP3 | 1X06 | 1 |
| 9 | 2N7002 | Q1 | SOT23 | 1 |
Comments (5)
Thanks for your work!
What is the diode D1, model and nominal?
@Looka 1N4148
@oleg.tchurilo Thank!
Good work! I can't figure out how the diode on the RX line helps. Can you explain briefly? Thanks!
You may need to ensure a pull-up resistor is also on the RX pin input for the D1 blocking method to work with a 5v system. See https://next-hack.com/index.php/2017/09/15/how-to-interface-a-5v-output-to-a-3-3v-input/