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Features-rich ESP32 development board in super compact form factor

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SENTSOR Core ESP32-MICRO

Introduction

"Kecil Kecil Cabe Rawit", an Indonesian proverb which means despite of its small size it's still powerful, and that is what describe SENTSOR Core Board ESP32-MICRO. Bringing latest ESP32 WiFi-BT-BLE SoC with whopping 16MB flash size to store all your firmware and file system; USB to UART bridge with USB Type-C connector for easy development; extremely accurate RTC with onboard rechargeable backup battery; battery-powered capability with full PMIC solution such as charger, protection and monitoring; and four addressable RGB LED for, you know, RGB goodness.

All of that features packed at 2-sided board assembly measured only 35.56x35.56mm. Not only small in size, SENTSOR Core Board ESP32-MICRO also small on power consumption with overall sleep mode power at only XuW, making this board suitable for both general purpose development board and low power embedded application.

Features

  • Super compact & powerful, measured only 35.56x35.56mm (1400x1400mil) with 3x10P standard pitch 2.54mm (100mil) pinout, packing all the onboard features.
  • ESP32-WROOM-32UE, comes with latest ECO V3 Dual Core 32-bit LX6 microprocessor with clock up to 240MHz, ULP co-processor, 520kB SRAM, 16MB flash.
  • 802.11b/g/n WiFi Connectivity, support mode STA/AP/STA+AP mode with external antenna using U.FL/IPEX connector allowing the board to be installed inside the enclosure without worrying transceiver signal quality.
  • Bluetooth 4.2 Connectivity, support classic bluetooth and Low Energy (LE) protocol.
  • CP2104 UART to USB Bridge, full-speed programmer & data port with auto-reset trigger using DTR and RTS line.
  • DS3231M RTC, extremely accurate ±5ppm RTC with alarm trigger capability and onboard MS621FE rechargeable backup battery. Connected via I2C at address 0x68.
  • Battery Powered, run SENTSOR board everywhere without power supply issue with 1-cell Lithium Ion/Polymer battery via JST-PH connector.
  • CN3165 Battery Charger, solar-powered and USB-compatible Lithium Ion/Polymer charger with on-chip adaptive charging current for wide range of input power scenario.
  • DW01A Battery Protection, battery usage protection against over-charge, over-discharge, over-current, and short circuit.
  • BQ27441-G1 Battery Fuel Gauge, accurately monitor your battery Relative State of Charge (RSOC).
  • RT9078 & RT9013 LDO, dual low quiescent current LDO design providing configurable +3.3V power rail up to 800mA.
  • Super Low Power, measured sleep mode power consumption down to XuW (XuA XV at VBAT pin, LDO2 off).
  • Built-in LED/RGB, single color active-low LED connected to pin IO2, and 4xSK6812 addressable RGB LED connected to pin IO4. SK6812 data out is exposed so you can chain it up with the rest of the LED circuit.
  • MicroSD socket, connected via SPI with slave select (SS) at pin IO5.
  • 22 pin GPIO @3V3 level, 3xUART, 2xSPI, 2xI2C, 2xI2S, 12bit ADC, 8bit DAC, hall-effect sensing, capacitive sensing, JTAG debug, etc. Please see pinout poster/schematic file for more information.

How to Use

Installing USB-UART Driver

Normally the CP2104 driver is automatically recognized and/or installed by Windows Update (for Windows OS). But if you have a problem, you can install it manually by downloading the latest driver here https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers. The step is straight forward, download the file and click the executable file to install the driver.

After this, you should see the serial communication device (and port number) both on your system (device manager) or in the Arduino IDE software. You can skip this step if you already install the driver.

Installing ESP32 Hardware Package

Chip from Espressif doesn't supported out-of-the-box by Arduino IDE so we need 3rd-party hardware package called ESP32 Arduino Core. The package installed using board manager, for detailed instruction on how to install ESP32 Arduino Core on Arduino IDE you can follow the step here https://github.com/espressif/arduino-esp32/blob/master/docs/arduino-ide/boards_manager.md.

Once it's done, ESP32 should be listed on the board selection menu. Choose ESP32 Dev Module on board option, 16MB (128Mb) on the flash size option and set the PSRAM option to disabled. For the partition scheme (application memory & file system) you can choose the allocation combination as needed, and the other option can left as default.

Now your SENTSOR Core ESP32-MICRO is ready to be use! You can skip this step if you already install the ESP32 hardware package.

Dependency

To access on-board peripheral like RTC, MicroSD & RGB LED you may need to install related library below:

or any other library of your choice that have same functionality.

Battery Powered

SENTSOR Core Board ESP32-MICRO can be powered using 1-cell (3.7V-4.2V) Lithium-Ion/Polymer battery using JST-PH connector. The charging process can be done by supplying external power to VIN pin or USB port, charging current is set via ISET resistor (please see schematic file for more information).

⚠️ Caution!
Please pay attention to the battery connector polarity, there's +/- sign on the board silkscreen.

Power Configuration

This board have 2 LDO regulator (named LDO1 & LDO2), where LDO1 is always on and LDO2 controlled using IO27 (active-high). Also there's one exposed jumper pad (labeled VIN CUT, see poster above) which control the VIN input rail selection.

State VIN_CUT VIN
VBAT > VIN0 X VBAT
VBAT < VIN0 0 VIN0
VBAT < VIN0 1 VBAT

X = don't care. 1 mean the pad is connected, whether using 0Ω resistor or solder bridge. 0 mean the pad is left open (unconnected).

Bill of Materials

Designator Qty Name/Value Footprint
U1 1 RT9078-33GJ5 TSOT-23-5_L2.9-W1.6-P0.95
U2 1 RT9013-33GB TSOT-23-5_L2.9-W1.6-P0.95
U3 1 CN3165 DFN-8_L3.0-W3.0-P0.50
U4 1 DW01A SOT-23-6_L2.9-W1.6-P0.95
U5 1 BQ27441DRZR-G1B SON-12_L4.0-W2.5-P0.40
U6 1 CP2104-F03-GMR QFN-24_L4.0-W4.0-P0.50
U7 1 ESP32-WROOM-32UE(16MB) WIFIM-32UE-SMD_38P
U8 1 DS3231MZ+ SOIC-8_L4.9-W3.9-P1.27
R0 1 0 (NC) R0402
R1,R2 2 100k R0402
R10 1 0.01 R0603
R11 1 1M R0402
R12,R13 2 5.1k R0402
R23 1 300 R0402
R3,R4,R7,R8,R24 5 1k R0402
R5 1 3.9k R0402
R6 1 100 R0603
R9,R14,R15,R16,R17, R18,R19,R20,R21,R22 10 10k R0402
C1,C3,C5,C9,C11 5 1u C0402
C10 1 4.7u C0402
C2,C6 2 10u C0402
C4 1 220u, 6.3V CASE-B_3528
C7,C12,C13,C14,C15, C16,C17,C18,C19 9 100n C0402
C8 1 470n C0402
F1 1 BSMD0402L-035 F0402
D1,D3 2 B5819WS SOD-323_L1.8-W1.3
D2 1 USBLC6-2SC6 SOT-23-6_L2.9-W1.6-P0.95
D4 1 BAS716 SOD-523_L1.2-W0.8
LED1 1 Blue LED0402
LED2 1 Green LED0402
LED3 1 Red LED0402
LED4 1 White LED0402
LED5,LED6,LED7,LED8 4 EC20-SK6812 LED2020
Q1 1 BSS138PW,115 SOT-323-3_L2.2-W1.3-P1.30
Q2 1 HSSK8811 SOT-363_L2.0-W1.3-P0.65
Q3 1 SL8205S SOT-23-6_L2.9-W1.6-P0.95
Q4 1 UMH3N SC-70-6_L2.2-W1.3-P0.65
BTN1,BTN2 2 3.9x3x4.45 SW-SMD_L3.9-W3.0-P4.45
CN1 1 JST-PH_2P CONN-SMD_2P-P2.00
CN2 1 TYPEC-304S-ACP16 USB-C-SMD
CARD1 1 HYC80-TF08-375 HYC80-TF08-XXX
BAT1 1 MS621FE MS621FE

Design

SENTSOR Core ESP32-MICRO is an open source hardware, please use it wisely. The project files is hosted on online based EDA called EasyEDA, you can access it via link below:

Link: https://easyeda.com/sentsor-project/sentsor-core-esp32-micro

Gallery

Render View:

Support Open Source Hardware & SENTSOR!

If you are interested in our product, you can buy them in the marketplace or by giving donation using this link below:

Store Store Donate

Your support will be very helpful for the next development of open source hardware from SENTSOR.

Information

SENTSOR
Author: Adam Alfath
Contact: [email protected]
Web: sentsor.net
Repo: SENTSOR Main Repo

Creative Commons License
SENTSOR Core ESP32-MICRO is licensed under Creative Commons Attribution-ShareAlike 4.0 International License.