Espressif ESP32-S3
Smart Bedside Sleep Companion
Overview
A compact, low-cost bedside sleep companion featuring ambient lighting and circadian rhythm regulation with Wi-Fi and Bluetooth connectivity, powered by a rechargeable USB-C battery.
Hitesh HonmaneSystem architecture
MCU
POWER
SENSOR
ACTUATOR
- POWER → MCUPowerMain regulated power supply for MCU
- POWER → SENSOR_ENVPowerPower supply for sensors
- POWER → SENSOR_BIOPowerPower supply for biometric sensor
- POWER → RTCPowerPower supply for RTC
- MCU → SENSOR_ENVI2CI2C bus for ambient light and temperature/humidity sensors
- MCU → SENSOR_BIOI2CI2C bus for biometric PPG sensor
- MCU → RTCI2CI2C bus for Real-Time Clock communication and alarm sync
- MCU → ACTUATOR_LIGHTI2CI2C control interface to PCA9685 LED driver
- MCU → ACTUATOR_AUDIOPWMPWM signal to drive buzzer and haptic feedback
- MCU → INPUT_UIGPIOGPIO polling and interrupts for rotary encoder and buttons
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| ESP32-S3 | MCU | Espressif ESP32-S3 Central processor handling Wi-Fi/BLE connectivity, local circadian algorithms, sensor aggregation, and lighting control. | Espressif Systems | 56-VFQFN Exposed Pad | 1 | Matched | |
4 alternatives consideredAI verified | |||||||
| BQ25896RTWR. | POWER | USB-C Power Management and Battery Charging Circuit (BQ25896 / TPS63020) Manages USB-C charging, internal rechargeable battery, and provides regulated 3.3V system power. | Texas Instruments | — | 1 | Matched | |
3 alternatives consideredAI verified | |||||||
| VEML7700 | SENSOR | VEML7700 & SHT41 Measures ambient room illumination, color temperature, and bedroom climate for sleep hygiene. | Vishay Semiconductor Opto Division | Digi-ReelR Alternate Packaging | 1 | Matched | |
| MAX30102EVKIT+ | SENSOR | MAX30102 Captures heart rate, HRV, and SpO2 for sleep stage tracking and biometric synchronization. | Analog Devices, Inc. | — | 1 | Matched | |
2 alternatives consideredAI verified | |||||||
| DS3231SNZ | SENSOR | DS3231 Provides accurate real-time clockkeeping and hardware alarm triggers with backup battery support. | Maxim Integrated | — | 1 | Matched | |
2 alternatives consideredAI verified | |||||||
| PCA9685 | ACTUATOR | PCA9685 & Multi-Channel LED Array Drives dynamic ambient lighting arrays for circadian rhythm regulation and alarm simulation. | Nxp Semiconductors | — | 1 | Matched | |
| PIEZO-01 | ACTUATOR | Buzzer and Haptic Driver Provides gentle alarm clock features and acoustic/haptic feedback. | OSEPP Electronics LTD | Blister Pack | 1 | Matched | |
4 alternatives consideredAI verified | |||||||
| PUSH-04 | ACTUATOR | Rotary Encoder and Tactile Buttons Local user interface for manual alarm setting, brightness control, and sleep mode activation. | OSEPP Electronics LTD | - | 1 | Matched | |
1 alternatives consideredAI verified | |||||||
Build guide
6-8 hoursAdvanced
1
Procurement & Preparation
- Source and inventory all raw components including the Espressif ESP32-S3, BQ25896RTWR power management IC, TPS63020 regulator, VEML7700, SHT41, MAX30102, DS3231SNZ, PCA9685, multi-channel LED array, PIEZO-01 buzzer, and PUSH-04 rotary encoder and buttons.
- Prepare the custom printed circuit board (PCB) for the Smart Sleep Companion, applying lead-free solder paste to the SMT pads using a stainless steel stencil.
2
Hardware Assembly & Wiring
- Place surface mount ICs including the Espressif ESP32-S3, BQ25896RTWR, TPS63020, VEML7700, SHT41, MAX30102, DS3231SNZ, and PCA9685 onto their respective solder-pasted pads on the PCB using a pick-and-place machine or precision tweezers.
- Run the PCB through a reflow soldering oven adhering to the lead-free thermal profile. Inspect joints under magnification for bridging or cold solder joints.
- Hand-solder through-hole and electromechanical components including the PIEZO-01 buzzer, PUSH-04 rotary encoder, tactile buttons, and the multi-channel LED array.
- Wire the peripheral interfaces: connect power rails (3.3V, GND) from POWER to MCU, SENSOR_ENV, SENSOR_BIO, and RTC. Hook up I2C data lines (SDA, SCL) between MCU and SENSOR_ENV, SENSOR_BIO, RTC, and ACTUATOR_LIGHT. Connect PWM_OUT to ACTUATOR_AUDIO, and GPIO lines (ENC_A, ENC_B, BTN) to INPUT_UI.
3
Firmware Setup
- Connect the ESP32-S3 programming header to a host computer via a USB-to-UART bridge adapter. Install the ESP-IDF development framework and configure the project workspace.
- Compile and flash the firmware binary incorporating local circadian rhythm algorithms, Wi-Fi/BLE connectivity stacks, sensor drivers for VEML7700, SHT41, MAX30102, DS3231, and LED lighting control via PCA9685.
4
Testing & Calibration
- Perform initial power-on self-test (POST) running on battery power managed by the BQ25896/TPS63020 circuit. Verify stable 3.3V system rails and confirm USB-C battery charging functionality.
- Calibrate ambient sensors and biometric modules: test VEML7700 lux readings against a reference light meter, verify SHT41 temperature/humidity accuracy, test MAX30102 heart rate and SpO2 response using an optical finger simulator, and check DS3231 RTC clock timekeeping.
- Verify user interface and actuator functionality: test rotary encoder navigation (ENC_A, ENC_B, BTN), trigger acoustic/haptic feedback on the PIEZO-01 buzzer, and validate smooth dimming and color transitions on the multi-channel LED array driven by the PCA9685.
- Perform end-to-end connectivity and sleep companion system test: verify Wi-Fi and BLE pairing, test local circadian rhythm automation routines, and run a 24-hour burn-in test.
Document
Smart Bedside Sleep Companion
A compact, low-cost bedside sleep companion featuring ambient lighting and circadian rhythm regulation with Wi-Fi and Bluetooth connectivity, powered by a rechargeable USB-C battery.
Design Overview
| Item | Details |
|---|---|
| Product Type | Smart Sleep Companion |
| Key Functions | Ambient lighting for sleep enhancement, Circadian rhythm regulation, Smart home integration, Sleep data synchronization, Alarm clock features |
| Power Source | Rechargeable internal battery via USB-C |
| Connectivity | Wi-Fi, Bluetooth |
| Size | Compact bedside alarm clock size |
| Environment | indoor |
| Difficulty | Advanced |
| Est. Time | 6-8 hours |
System Architecture
Power Topology: USB-C input connects to a battery management IC (BQ25896) to charge a single-cell Li-ion battery and run a buck-boost converter (TPS63020) to generate a stable 3.3V rail for the MCU, sensors, and low-power peripherals, while providing a direct 5V bus rail for the high-current LED driver and ambient lighting array.
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| MCU | MCU | Espressif ESP32-S3 | Central processor handling Wi-Fi/BLE connectivity, local circadian algorithms, sensor aggregation, and lighting control. | 3.3V |
| POWER | POWER | USB-C Power Management and Battery Charging Circuit (BQ25896 / TPS63020) | Manages USB-C charging, internal rechargeable battery, and provides regulated 3.3V system power. | 5V / 3.3V |
| SENSOR_ENV | SENSOR | VEML7700 & SHT41 | Measures ambient room illumination, color temperature, and bedroom climate for sleep hygiene. | 3.3V |
| SENSOR_BIO | SENSOR | MAX30102 | Captures heart rate, HRV, and SpO2 for sleep stage tracking and biometric synchronization. | 3.3V |
| RTC | SENSOR | DS3231 | Provides accurate real-time clockkeeping and hardware alarm triggers with backup battery support. | 3.3V |
| ACTUATOR_LIGHT | ACTUATOR | PCA9685 & Multi-Channel LED Array | Drives dynamic ambient lighting arrays for circadian rhythm regulation and alarm simulation. | 5V / 3.3V |
| ACTUATOR_AUDIO | ACTUATOR | Buzzer and Haptic Driver | Provides gentle alarm clock features and acoustic/haptic feedback. | 3.3V |
| INPUT_UI | ACTUATOR | Rotary Encoder and Tactile Buttons | Local user interface for manual alarm setting, brightness control, and sleep mode activation. | 3.3V |
Key Components
8/8 modules matched to real parts. See the BOM tab for the full component table.
Espressif ESP32-S3 (ESP32-S3)
Candidate 3 (ESP32-S3) is the exact match for the primary MPN 'ESP32-S3' from the preferred manufacturer Espressif Syste
USB-C Power Management and Battery Charging Circuit (BQ25896 / TPS63020) (BQ25896RTWR.)
Exact match for the primary MPN BQ25896 from the preferred manufacturer Texas Instruments (ordering suffix RTWR included
Build Summary
- Difficulty: Advanced
- Estimated time: 6-8 hours
- Tools required: Anti-static mat, Component sorting trays, Digital Multimeter, Solder paste stencil, Squeegee, Lead-free solder paste
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: A device companion which helps user to sleep