# Academic Aqua R2-D2 ## Description Avionics-grade ESP32 data logger: low-noise 3.3V, I2C (MPU9250+BME280), SPI MicroSD, programming pads ## Project Details - **Owner:** dharma00 - **Created:** 2/8/2026 - **Last Updated:** 2/8/2026 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD VIN5V["VIN 5V"] --> REG33["3.3V Regulator >=600mA"] REG33 --> V3V3["3V3 Power Rail"] V3V3 --> ESP32["ESP32-WROOM-32"] V3V3 --> IMU["MPU9250 IMU"] V3V3 --> ENV["BME280 Env Sensor"] V3V3 --> SD["MicroSD Socket"] ESP32 -->|"I2C_SDA/I2C_SCL"| IMU ESP32 -->|"I2C_SDA/I2C_SCL"| ENV ESP32 -->|"SPI_MOSI/SPI_MISO/SPI_SCK"| SD ESP32 -->|"SD_CS"| SD IMU -->|"MPU_INT"| ESP32 PROG["Programming Header/Test Pads"] -->|"3V3,GND,EN,IO0,TX0,RX0"| ESP32 ``` ## Key Components ### U1 — [ESP32-WROOM-32E-N16](https://www.flux.ai/jecstronic/esp32-wroom-32e-n16.md) - Role Details: ESP32 module, Wi-Fi + BT, main controller - Role: MCU - Manufacturer Name: Espressif Systems - Part Type: Module - Manufacturer Part Number: ESP32-WROOM-32E-N16 - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf - Package: Module - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 43] - GND [pin 1] - GND [pin 38] - GND [pin 42] - GND [pin 40] - GND [pin 46] - GND [pin 41] - GND [pin 45] - GND [pin 15] - GND [pin 47] - GND [pin 39] - GND [pin 44] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 21] - NC [pin 20] - NC [pin 32] - NC [pin 19] - NC [pin 17] - NC [pin 22] - NC [pin 18] - RXD0 [pin 34] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - TXD0 [pin 35] ### U2 — [MPU9250](https://www.flux.ai/jecstronic/mpu9250.md) - Manufacturer Name: TDK InvenSense - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811071022_TDK-InvenSense-MPU-9250_C71459.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MPU-9250 - Part Type: Sensor - Role: Sensor - Package: QFN-24 - Role Details: IMU (accel/gyro/mag) on I2C bus **Pins:** - ~CS~ [pin 22] - AD0/SDO [pin 9] - AUX_CL [pin 7] - AUX_DA [pin 21] - FSYNC [pin 11] - GND [pin 18] - INT [pin 12] - MNT_PAD [pin 25] - NC [pin 3] - NC [pin 6] - NC [pin 2] - NC [pin 5] - NC [pin 14] - NC [pin 16] - NC [pin 15] - NC [pin 4] - NC [pin 17] - REGOUT [pin 10] - RESV [pin 19] - RESV [pin 20] - RESV [pin 1] - SCL/SCLK [pin 23] - SDA/SDI [pin 24] - VDD [pin 13] - VDDIO [pin 8] ### U3 — [BME280](https://www.flux.ai/chaykak2/bme280.md) - Part Type: Sensor - Role Details: Env sensor (temp/pressure/humidity) on I2C bus - Package: LGA-8 - Datasheet URL: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf - Role: Sensor - Manufacturer Part Number: BME280 - Manufacturer Name: Bosch Sensortec **Pins:** - CSB [pin 2] - GND [pin 7] - GND [pin 1] - MISO [pin 5] - MOSI [pin 3] - SCK [pin 4] - VDD [pin 8] - VDDIO [pin 6] ### U4 — [TLV1117-33IDCYR](https://www.flux.ai/adrian95/tlv1117-33idcyr.md) - Manufacturer Part Number: TLV1117-33IDCYR - Part Type: Integrated Circuit - Role Details: 5V VIN to 3V3, >=600mA LDO - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftlv1117 - Package: SOT-223 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Regulator **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] ### U5 — [ST-TF-003A](https://www.flux.ai/adrian95/st-tf-003a.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Manufacturer Name: Suntech - Role Details: MicroSD card socket, SPI interface - Package: MicroSD socket - Manufacturer Part Number: ST-TF-003A - Datasheet URL: https://www.snapeda.com/parts/ST-TF-003A/Suntech/view-part/?ref=search&t=micro%20sd%20socket **Pins:** - CD [pin G2] - CD2 [pin G3] - CS [pin 2] - DI [pin 3] - DO [pin 7] - GND [pin G4] - GND [pin G1] - GND [pin 6] - NC [pin 1] - RSV [pin 8] - SCK [pin 5] - SHIELD [pin 9] - VCC [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/dharma00/academic-aqua-r2-d2](https://www.flux.ai/dharma00/academic-aqua-r2-d2).* --- *Generated from [https://www.flux.ai/dharma00/academic-aqua-r2-d2](https://www.flux.ai/dharma00/academic-aqua-r2-d2)*