openbook

Overview

📚 eBook Reader – System Overview

This project is an eBook reader based on the ESP32-C3 microcontroller. It features a 7.5" E-Ink display, SD card storage, environmental sensing, and a rechargeable LiPo battery, all optimized for low power consumption and readability.

ESP32-C3 WROOM

The main microcontroller that handles:

• Display updates via SPI
• File system and memory management
• Button inputs through GPIO
• Communication with sensors and RTC via I2C
• USB communication for firmware updates or data transfer

E-Ink DISPLAY 7.5" 800x400

• Ultra-low power display ideal for reading in bright light
• Interface: SPI
• Controlled by the ESP32 for rendering text and images

Storage

• SD Card: Stores eBooks and data files
• External NOR Flash: Used for firmware, fonts, or static assets

Power Management

• USB-C: Input for charging and potential USB data connection
• Battery Charger (MCP73831): Manages LiPo charging
• LiPo Battery: Powers the system when unplugged
• Battery Level Monitor (MAX17048G+T10): Reports battery percentage to the ESP32
• 3V3 LDO Regulator: Provides stable 3.3V for the system

BME688 Sensor

• Measures:
  • Temperature
  • Humidity
  • Pressure
  • Air quality
• Data can be displayed or logged for contextual awareness

DS3231SN RTC Module

• Keeps track of time even when powered off
• Useful for:
  • Timestamps
  • Scheduled wake-ups
  • Time-based features

⚡ Energy Usage Overview

Estimated average current during typical reading:

Component	Avg Current	Notes
ESP32-C3	~2 mA	Light sleep + brief active use
E-Ink Display	~1–2 mA	Only draws power during refresh
SD Card	~1 mA	Accessed briefly per page turn
BME688 Sensor	~0.15 mA	In low-power mode
RTC DS3231SN	~0.002 mA	Always running
Battery Monitor	~0.05 mA	Very low power
Total	~5.2 mA	Approximate average current

With a 1200 mAh LiPo battery:

• Estimated runtime: ~9 days of light usage
• Based on 1 screen update per minute, minimal background activity

Bill of Materials (BOM)

SAMACSYS_PARTS_USB4110GFA	Value	Device	Detailed Description	Link
BOOT_BUTTON	BUTTON_CUSYOMV1	BUTTON_CUSYOMV1		https://industry.panasonic.com/global/en/products/control/switch/light-touch/number/evqpuj02k
C1	100nF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C1_BAT	4.7uF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C1_BAT1	4.7uF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C1_BAT2	4.7uF	EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C2	100nF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C2_BAT	4.7uF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C3	100uF TANT	RCL_CPOL-EUCT3528	POLARIZED CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/Panasonic/EEU-FS1K101L?qs=sGAEpiMZZMvwFf0viD3Y3fHxNcSaiftwbgqrEa58hlq7Mz20qWHEdw%3D%3D
C4	4.7uF/25V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C4_USB	100nF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C5	1uF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C5_USB	4.7uF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C6	100nF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C7	10uF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C8	100nF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C9	100nF	EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C10	100nF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
C10_SUPERCAP	CPH3225A	CPH3225A	Cap 0.011F 3.3V 1210 Flat	https://ro.mouser.com/ProductDetail/Seiko-Semiconductors/CPH3225A?qs=3etwrb1wR%252BhUOph6lAO7eg%3D%3D
CHANGE_BUTTON	BUTTON_CUSYOMV1	BUTTON_CUSYOMV1		https://industry.panasonic.com/global/en/products/control/switch/light-touch/number/evqpuj02k
CHG_LED		ADAFRUIT_LEDCHIP-LED0603	LED	https://ro.mouser.com/ProductDetail/BJB/35.116.1007-001-01?qs=iLKYxzqNS76jqQb6thkyzg%3D%3D
C_DELAY	100nF	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KYOCERA-AVX/12107C104KAT2A?qs=%252BdQmOuGyFcEpzvTfYF11Tg%3D%3D
D1	USBLC6-2SC6Y	USBLC6-2SC6Y	Low Cap. ESD Protection Auto SOT-23-6 STMicroelectronics USBLC6-2SC6Y, Dual Uni-Directional TVS Diode Array, 6-Pin SOT-23	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D2	ESP32_WROVER_AVX---SD0805S020S1R0_AVX_SD0805S020S1R0_0_0AVX_SD0805S020S1R0_0_0	ESP32_WROVER_AVX---SD0805S020S1R0_AVX_SD0805S020S1R0_0_0AVX_SD0805S020S1R0_0_0	Schottky Barrier Rectifier Diode	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D3	MBR0530	MBR0530	ON SEMICONDUCTOR - MBR0530 - DIODE, SCHOTTKY, 0.5A, 30V, SOD-123	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D4	MBR0530	MBR0530	ON SEMICONDUCTOR - MBR0530 - DIODE, SCHOTTKY, 0.5A, 30V, SOD-123	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D5	MBR0530	MBR0530	ON SEMICONDUCTOR - MBR0530 - DIODE, SCHOTTKY, 0.5A, 30V, SOD-123	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D6	PGB1010603MR	PGB1010603MR	Check availability	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D7	ESP32_WROVER_AVX---SD0805S020S1R0_AVX_SD0805S020S1R0_0_0AVX_SD0805S020S1R0_0_0	ESP32_WROVER_AVX---SD0805S020S1R0_AVX_SD0805S020S1R0_0_0AVX_SD0805S020S1R0_0_0	Schottky Barrier Rectifier Diode	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D8	PGB1010603MR	PGB1010603MR	Schottky Barrier Rectifier Diode	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D9	PGB1010603MR	PGB1010603MR	Schottky Barrier Rectifier Diode	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D10	PGB1010603MR	PGB1010603MR	Schottky Barrier Rectifier Diode	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D11	PGB1010603MR	PGB1010603MR	Schottky Barrier Rectifier Diode	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
D12	PGB1010603MR	PGB1010603MR	Schottky Barrier Rectifier Diode	https://ro.mouser.com/ProductDetail/Nexperia/PMEG6030AEXEX?qs=olJun0bQHM8zqhEtOgE2ZA%3D%3D
EPD_C1	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C2	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C5	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C6	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C7	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C8	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C9	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C10	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C11	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
EPD_C12	1uF/50V	ESP32_WROVER_EAGLE-LTSPICE_CC0402	CAPACITOR, European symbol	https://ro.mouser.com/ProductDetail/KEMET/MMK10105K50A01L4BULK?qs=IKDMbYZLynBqWdM%252BAUSFtw%3D%3D
IC1	BD5229G-TR	BD5229G-TR	Voltage Detector with Adjustable Delay Time: CMOS processes are utilized to develop high precision, low current consumption CMOS reset ICs that allow arbitrary setting of the delay time. The extensive lineup includes both Nch Open Drain and CMOS output types in a wide range of detection voltages (from 2.3V to 6.0V, in 0.1V steps), enabling selection of the ideal solution based on customer requirements. In addition, the entire series is of course both lead-free and RoHS-compliant.	https://ro.mouser.com/ProductDetail/ROHM-Semiconductor/BD5229G-TR?qs=4kLU8WoGk0vvnhrrYwdszw%3D%3D
IC4	XC6220A331MR-G	XC6220A331MR-G	LDO Voltage Regulators
J1	FH34SRJ-24S-0.5SH_99_	FH34SRJ-24S-0.5SH_99_	24 Position FFC, FPC Connector Contacts, Top and Bottom 0.020 (0.50mm) Surface Mount, Right Angle"
J2	SAMACSYS_PARTS_USB4110-GF-A	SAMACSYS_PARTS_USB4110-GF-A	CONN USB 2.0 TYPE-C R/A SMT
J3	QWIIC_RIGHT_ANGLE	QWIIC_CONNECTORJS-1MM	SparkFun I2C Standard Qwiic Connector
J4	112A-TAAR-R03_ATTEND	112A-TAAR-R03_ATTEND	Micro SD Card Socket, Push-Push Type, Top Mount, SMT, H=1.83mm, 10u
L1	68uH	744043680IND_4828-WE-TPC_WRE
PFMF.050.1	ESP32C6_VARISTORCN1812	ESP32C6_VARISTORCN1812	VARISTOR
Q1	20V/4.2A/52mO/1.4W	ESP32_WROVER_SPARKFUN-DISCRETESEMI_MOSFET_PCH-DMG2305UX-7	P-channel MOSFETs
Q2	20V/4.2A/52mO/1.4W	ESP32_WROVER_SPARKFUN-DISCRETESEMI_MOSFET_PCH-DMG2305UX-7	P-channel MOSFETs	https://ro.mouser.com/ProductDetail/Vishay-Siliconix/SQ3425CEV-T1_GE3?qs=i8QVZAFTkqQazbKSzWc2Vg%3D%3D
Q3	SI1308EDL-T1-GE3	SI1308EDL-T1-GE3	MOSFET N-Ch 30V 1.5A TrenchFET SC70 Vishay Si1308EDL-T1-GE3 N-channel MOSFET Transistor, 1.5 A, 30 V, 3-Pin SC-70	https://ro.mouser.com/ProductDetail/Vishay-Semiconductors/SI1308EDL-T1-GE3?qs=bX1%252BNvsK%2FBramh9tgpOaEw%3D%3D
R1	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R1-PINH	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R1-PINH1	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R1_BAT	200	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R1_PWRUSB	100K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R2	2.2	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R2-PINH	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R2-PINH1	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R2-USB	5k1	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R2-USB1	5k1	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R2_BAT	2K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R3	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R4	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R5	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R6	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R7	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R8	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R9	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R10	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
RESET_BUTTON	BUTTON_CUSYOMV1	BUTTON_CUSYOMV1		https://industry.panasonic.com/global/en/products/control/switch/light-touch/number/evqpuj02k
R_BOOT	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R_CAPACITOR	15	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R_CHANGE	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R_CL1	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
R_RESET	10K	ESP32_WROVER_EAGLE-LTSPICE_RR0402	RESISTOR, European symbol	https://ro.mouser.com/ProductDetail/Vishay-Beyschlag/MCS0402MD4703BE500?qs=sGAEpiMZZMtlubZbdhIBIE4nSA98ICq40rObWhdYP%252BY%3D
SENSOR2		ESP32_WROVER_BME680_BME680	Integrated Environmental Unit	https://ro.mouser.com/ProductDetail/Bosch-Sensortec/BME680?qs=v271MhAjFHjo0yA%2FC4OnDQ%3D%3D
SJ1		SJ	SMD solder JUMPER	https://ro.mouser.com/ProductDetail/Nidec-Components/CJS-1201B?qs=XeJtXLiO41SSSa2Z7HG9Iw%3D%3D
TP1	TPTP20R	TPTP20R	Test pad
TP2	TPTP20R	TPTP20R	Test pad
TP3	TPTP20R	TPTP20R	Test pad
TP4	TPTP20R	TPTP20R	Test pad
TP5	TPTP20R	TPTP20R	Test pad
TP6	TPTP20R	TPTP20R	Test pad
TP7	TPTP20R	TPTP20R	Test pad
TP8	TPTP20R	TPTP20R	Test pad
TP9	TPTP20R	TPTP20R	Test pad
TP10	TPTP20R	TPTP20R	Test pad
TP11	TPTP20R	TPTP20R	Test pad
TP12	TPTP20R	TPTP20R	Test pad
TP13	TPTP20R	TPTP20R	Test pad
TP14	TPTP20R	TPTP20R	Test pad
TP15	TPTP20R	TPTP20R	Test pad
TP16	TPTP20R	TPTP20R	Test pad
TP17	TPTP20R	TPTP20R	Test pad
U1	W25Q512JVEIQ	W25Q512JVEIQ		https://ro.mouser.com/ProductDetail/Winbond/W25Q512JVEIQ?qs=l7cgNqFNU1jw6svr3at6tA%3D%3D
U2	ESP32-C6-WROOM-1-N8	ESP32-C6-WROOM-1-N8		https://ro.mouser.com/ProductDetail/Espressif-Systems/ESP32-C6-WROOM-1-N8?qs=8Wlm6%252BaMh8ST02Gmwp74cw%3D%3D
U3	DS3231SN#	DS3231SN#		https://ro.mouser.com/ProductDetail/Analog-Devices-Maxim-Integrated/DS3231SN?qs=1eQvB6Dk1vhUlr8%2FOrV0Fw%3D%3D
U4	MAX17048G+T10	MAX17048G+T10		https://ro.mouser.com/ProductDetail/Analog-Devices-Maxim-Integrated/MAX17048G%2bT10?qs=D7PJwyCwLAoGnnn8jEPRBQ%3D%3D
U5	MCP73831	ESP32_WROVER_SPARKFUN-IC-POWER_MCP73831	MCP73831T Li-Ion, Li-Pol Controller	https://ro.mouser.com/ProductDetail/Microchip-Technology/MCP73831T-2ACI-OT?qs=yUQqVecv4qvbBQBGbHx0Mw%3D%3D

Detailed description

• Resistor (R1) connected to GPIO8: This is a pull-up resistor connected to GPIO8. Pull-up resistors are used to ensure a pin has a defined high state when no external signal is applied.
• GPIO8: This is a general-purpose input/output pin. It can be configured as either an input or an output.
• IO/BOOT (Pin 15): This pin is used to put the ESP32-C6 into bootloader mode, which is necessary for flashing firmware.
• NC (Pin 22): This stands for "No Connection." This pin is not connected to anything in this particular circuit.
• EN (Pin 3): This is the Enable pin. Pulling this pin low resets the ESP32-C6.
• INT_RTC (Pin 8): This is likely an interrupt pin related to the Real-Time Clock (RTC) functionality.
• 32KHz (Pin 9): This is probably the input for a 32.768 kHz crystal oscillator, which is used for the RTC.
• MISO (Pin 27): This is the Master In Slave Out pin for the SPI (Serial Peripheral Interface) communication protocol.
• EPD_BUSY (Pin 4): This pin is likely used to signal the busy state of an E-Paper Display (EPD).
• SS_SD (Pin 5): This is the Slave Select pin for the SD card interface.
• EPD_DC (Pin 6): This is the Data/Command pin for the EPD.
• SCK (Pin 7): This is the Serial Clock pin for SPI communication.
• MOSI (Pin 10): This is the Master Out Slave In pin for SPI communication.
• 3V3 (Pin 2): This is another 3.3V power supply pin.
• IO10 to IO15 (Pins 11-14, 23): These are general-purpose input/output pins.
• TXD0/GPIO16 (Pin 24): This is the transmit pin for UART0 (Universal Asynchronous Receiver/Transmitter) and also functions as GPIO16.
• RXD0/GPIO17 (Pin 25): This is the receive pin for UART0 and also functions as GPIO17.
• RX (Pin 16): This is likely another receive pin, possibly for a second UART.
• RTC_RST (Pin 17): This is the reset pin for the RTC.
• I2C_PW (Pin 12): This pin might be related to powering the I2C (Inter-Integrated Circuit) bus.
• IO18 to IO23 (Pins 18-21): These are general-purpose input/output pins.
• EPD_3V3_C (Pin 19): This is likely a 3.3V power supply pin specifically for the EPD.
• SDA (Pin 20): This is the Serial Data pin for I2C communication.
• SCL (Pin 21): This is the Serial Clock pin for I2C communication.
• EPD_RST (Pin 21): This is the reset pin for the EPD.
• 1*11 (Pin 1): This indicates that pin 1 is connected to ground (GND).