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LabExpert Sensor Board - Pin Usage Guide

Summary: All Pin Usage

This table aggregates all pin usage across different experiments/firmwares on the ESP32.

Pin Usage (Experiment: Function) Hardware Configuration
12 All: BLE Status LED Output (Active Low)
13 All: Sensor Connected LED Output (Active Low)
14 All: WiFi Status LED Output (Active Low)
16 All: OTA Status LED Output (Active Low)
18 All: EEPROM SDA External Pullup (I2C)
19 All: EEPROM SCL External Pullup (I2C)
21 TOF: SDA, ULT: Trig, BH: SDA, Mic: SD External Pullup (I2C)
22 TOF: SCL, ULT: Echo, BH: SCL, Mic: SCK External Pullup (I2C)
23 THR: OneWire, TOF: LDR Ext Pullup (THR) / Ext Pullup (TOF)
25 OTA: EEPROM WP Output (High = Protect, Low = Write)
26 TOF: Motor Left PWM, Mic: WS Output
27 All: Sensor Active LED Output (Active Low)
32 OSI: Restart Trigger Internal Pullup
33 TOF: Motor Right PWM, OSI: Sensor Output (TOF) / Internal Pullup (OSI)
34 OTA: BLE Trigger / Factory Reset Input (External 10k Pull-up Required)
35 TOF: Shared Limit Switch (OR Gate) Input (3.3V Logic - External Supply)

LED Logic (Active Low - VCC -> LED -> Pin):

  • Pin 14 (WiFi LED):
    • Disconnected: ON (LOW)
    • Connected: Blink (Toggle)
    • Bluetooth On: OFF (HIGH)
  • Pin 12 (BLE LED):
    • BLE On (Advertising): ON (LOW)
    • BLE Connected: Blink (Toggle)
    • BLE Off: OFF (HIGH)
  • Pin 13 (Sensor Connected LED):
    • Sensor Connected: OFF (HIGH)
    • Sensor Disconnected: ON (LOW)
  • Pin 27 (Sensor Active LED):
    • Sensor Connected & Active: Blink (Toggle)
    • Sensor Disconnected/Idle: OFF (HIGH)
  • Pin 16 (OTA LED):
    • OTA Restart Triggered: Fast Blink (Toggle)

1. THR Experiment (Temperature - DS18B20)

Project: THR_Firmware_bin_Generator

Pin Name Usage Configuration
23 ONE_WIRE_BUS DS18B20 Data Input/Output (Requires External Pullup ~4.7k惟)
18 EEPROM_SDA EEPROM I2C Data I2C (Requires Pullup)
19 EEPROM_SCL EEPROM I2C Clock I2C (Requires Pullup)
32 RESTART_PIN OTA Restart Trigger Input Internal Pullup
14 WIFI_LED WiFi Status Output (Active Low)
12 BLE_LED BLE Status Output (Active Low)
13 SENSOR_LED Sensor Connection Output (Active Low)
27 ACTIVE_LED Experiment Active Output (Active Low)
16 OTA_LED OTA Status Output (Active Low)

2. TOF Experiment (Time of Flight - VL53L1X + Motor)

Project: TOF_Firmware_bin_Generator

Pin Name Usage Configuration
21 TOF_SDA VL53L1X Data I2C (Requires Pullup)
22 TOF_SCL VL53L1X Clock I2C (Requires Pullup)
33 RPWM_PIN Motor Right PWM Output
26 LPWM_PIN Motor Left PWM Output
23 LDR_PIN Encoder/Limit Switch Input (External Pullup exists)
18 EEPROM_SDA EEPROM I2C Data I2C (Requires Pullup)
19 EEPROM_SCL EEPROM I2C Clock I2C (Requires Pullup)
32 RESTART_PIN OTA Restart Trigger Input Internal Pullup
35 LIMIT_PIN Combined Limit Switch Input (Active HIGH. 3.3V Logic)
14, 12, 13, 27, 16 LEDs Status Indicators Output (Active Low)

3. OSI Experiment (Oscillation Sensor)

Project: OSI_Firmware_bin_Generator

Pin Name Usage Configuration
33 SENSOR_PIN Oscillation Sensor Input (Internal Pullup recommended)
32 RESTART_PIN OTA Restart Trigger Input Internal Pullup (INPUT_PULLUP)
18 EEPROM_SDA EEPROM I2C Data I2C (Requires Pullup)
19 EEPROM_SCL EEPROM I2C Clock I2C (Requires Pullup)
14, 12, 13, 27, 16 LEDs Status Indicators Output (Active Low)

4. UltraSonic Experiment (HC-SR04)

Project: UltraSonic_Firmware_bin_Generator

Pin Name Usage Configuration
21 TRIG_PIN Sensor Trigger Output (Strong driver overrides I2C pullups)
22 ECHO_PIN Sensor Echo Input (Sensor drives High/Low, overrides I2C pullups)
18 EEPROM_SDA EEPROM I2C Data I2C (Requires Pullup)
19 EEPROM_SCL EEPROM I2C Clock I2C (Requires Pullup)
32 RESTART_PIN OTA Restart Trigger Input Internal Pullup
14, 12, 13, 27, 16 LEDs Status Indicators Output (Active Low)

5. Light Intensity Experiment (BH1750)

Target: ESP32 (Shared Bus w/ TOF/ULT)

Pin Name Usage Configuration
21 SDA BH1750 Data I2C (Shared with TOF)
22 SCL BH1750 Clock I2C (Shared with TOF)
18, 19 EEPROM System Bus I2C
13 LED Status Output

6. Microphone Experiment (INMP441 - I2S)

Target: ESP32 (Shared Pins)

鈿狅笍 CRITICAL WIRING NOTE:

  • WS (Pin 26) MUST be connected to ESP32.
  • L/R SHOULD be grounded.
Pin Name Usage Configuration
22 BCLK Serial Clock Output
21 DOUT Serial Data Input
26 LRCLK Word Select Output

7. OTA Bootloader

Project: ESP_32_OTA

Pin Name Usage Configuration
14 WIFI_LED WiFi Status Output (Active Low)
12 BLE_LED BLE Status Output (Active Low)
13 SENSOR_LED Sensor Status Output (Active Low)
16 OTA_LED OTA Status Output (Active Low)
27 ACTIVE_LED Active Status Output (Active Low)
25 EEPROM_WP EEPROM Write Protect Output (High = Protect, Low = Write)
34 BLE_TRIGGER Factory Reset / BLE Input (Hold 3s to erase creds. Req 10k ext pull-up)
18 EEPROM_SDA EEPROM I2C Data I2C (Requires Pullup)
19 EEPROM_SCL EEPROM I2C Clock I2C (Requires Pullup)