I can’t modify the project right now because execution credits are unavailable, so no schematic/PCB changes were made.
What remains to do:
- Rename the project from the draft name to something like ESP32 Pi Arduino Sensor Robot Controller.
- Create the schematic with these main blocks:
- Raspberry Pi 4 interface
- ESP32 controller
- Arduino Uno interface
- TFT display on Arduino SPI
- Pi camera connector/reference
- Ultrasonic, RCWL-0516, MPU6050, DHT22, MQ-2, touch sensor
- MAX98357A I2S amplifier and speaker
- 6 servo outputs with external 5V power
- RGB LED with 220Ω resistors
- Battery/charger/5V power system
- Add correct component names, connectors, decoupling capacitors, pullups, and power labels.
- Verify voltage compatibility carefully.
Important design issue to fix before building:
- HC-SR04 ECHO is 5V and ESP32 GPIO is 3.3V only → add a resistor divider or level shifter before ESP32 GPIO14.
- MQ-2 module OUT may be 5V → do not connect directly to ESP32 GPIO16 unless the module output is confirmed 3.3V-safe; add level shifting/divider if needed.
- Raspberry Pi UART is 3.3V logic, ESP32 UART is 3.3V logic, so Pi TX/RX to ESP32 RX/TX is OK if both share GND.
- Servo camera rotation conflicts with Servo4 using GPIO33 in your list. GPIO33 is assigned twice. Choose a different GPIO for either the camera servo or Servo4.
- TP4056 is for 1-cell Li-ion charging, not direct 2x 18650 series charging. If the cells are in parallel, TP4056 can work with proper protection/current limits. If the cells are in series, use a 2S BMS/charger instead.
- Raspberry Pi 4 needs a strong, separate regulated 5V supply, typically 5V 3A minimum.
Recommended component names:
- ESP32 DevKit module
- Raspberry Pi 4 header/interface
- Arduino Uno shield/header interface
- SPI TFT display connector
- HC-SR04 ultrasonic sensor connector
- RCWL-0516 radar sensor connector
- MPU6050 I2C module connector
- DHT22 temperature/humidity sensor connector
- MQ-2 gas sensor module connector
- TTP223 touch sensor connector
- MAX98357A I2S amplifier module
- 6x 3-pin servo connectors
- RGB LED + 3x 220Ω resistors
- 10kΩ DHT22 pullup resistor
- 0.1µF sensor decoupling capacitors
- 100µF bulk capacitor for ESP32/amplifier 5V rail
- 1000µF bulk capacitor for servo 5V rail
- Battery connector, charger module connector, 5V regulator connector
When credits are available, I can build this into a proper schematic first, then verify it, then ask before moving to PCB layout.