DHT11 & LM35 Temperature Humidity Multi-Function Easy Module Shield V1 for Arduino UNO

DHT11 & LM35 Temperature Humidity Multi-Function Easy Module Shield V1 for Arduino UNO is an all-in-one multi-sensor learning shield engineered to plug directly onto an Arduino UNO R3 without jumper wires or soldering. Furthermore, unlike basic 7-segment shields, this board comes factory-populated with a digital DHT11 temperature/humidity sensor, an analog LM35 precision centigrade temperature sensor, a photoresistor (LDR), a 5mm full-color RGB LED, an IR remote receiver, an active buzzer, a rotary potentiometer, two user pushbuttons, and two indicator LEDs. Consequently, students can immediately write and test 10+ environmental, optical, and audio sketches on a single unified board.

Key Features:

• Dual Onboard Temperature Sensors (DHT11 + LM35): Compare digital 1-Wire humidity/temperature telemetry (`DHT11` on `D4`) against continuous linear analog temperature sensing (`LM35` on `A2`) side by side.
• Integrated Photoresistor (LDR) & Rotary Potentiometer: Pre-wired CdS light sensor on `A1` and hand-turn knob potentiometer on `A0` for immediate 10-bit ADC calibration labs.
• Full-Color PWM RGB LED & Status LEDs: Includes a 3-channel PWM RGB LED (`D9, D10, D11`) plus dedicated Red (`D12`) and Blue (`D13`) digital indicator LEDs.
• Onboard 38kHz IR Receiver & Piezo Buzzer: Built-in infrared remote receiver (`D6`) and active buzzer (`D5`) enable remote-control decoding and audible alarm projects.
• I2C, TTL Serial & Spare Port Headers: Breaks out 4-pin `IIC` (`SDA/SCL`), 4-pin `TTL` UART, digital `D7/D8`, and analog `A3` headers for external expansion.

Technical Specifications:

• Compatible Host Boards: Arduino UNO R3, Arduino Leonardo R3, Arduino Mega 2560 R3
• DHT11 Sensor (`D4`): 20%–90% RH (±5% RH) Humidity | 0°C–50°C (±2°C) Digital Temperature
• LM35DZ Sensor (`A2`): Linear +10.0 mV/°C Analog Output (0°C to +100°C Range, ±0.5°C Accuracy)
• Analog Inputs Pre-Wired: `A0` (10kΩ Rotary Potentiometer), `A1` (LDR Photoresistor), `A2` (LM35 Temperature)
• Digital Inputs Pre-Wired: `D2 (SW1 Button)`, `D3 (SW2 Button)`, `D4 (DHT11)`, `D6 (38kHz IR Receiver)`
• Digital & PWM Outputs Pre-Wired: `D5 (Buzzer)`, `D9/D10/D11 (RGB LED)`, `D12 (Red LED)`, `D13 (Blue LED)`
• Operating Voltage: 5.0V DC (Powered from Host Arduino UNO)

Mechanical Specifications:

• PCB Form Factor: Standard 68.6mm × 53.4mm Arduino UNO R3 Shield Layout
• Potentiometer Style: Knurled Vertical Finger-Turn Shaft Potentiometer
• Onboard Switches: 2 × Programmable Tactile Pushbuttons (`SW1, SW2`) + 1 × Hardware `RESET` Button

Dimensions:

• Length: 68.6 mm
• Width: 53.4 mm
• Height: 20.0 mm
• Weight: ≈ 26 g

Pinout and Wiring:

• Analog Map: `A0` = Rotary Potentiometer, `A1` = LDR Light Sensor, `A2` = LM35 Temperature (`Temp_C = (analogRead(A2) * 500.0) / 1024.0`), `A3` = Spare 3-Pin Analog Header.
• Digital Map: `D2` = Button SW1 (External Interrupt INT0), `D3` = Button SW2 (INT1), `D4` = DHT11 Data, `D5` = Buzzer, `D6` = IR Receiver, `D9/D10/D11` = RGB LED, `D12` = Red LED, `D13` = Blue LED.
• I2C Header (`IIC`): Connects 4-pin I2C OLED or 1602 LCD displays directly to `GND, 5V, SDA (A4), SCL (A5)`.
• Engineering Precaution: Because every pin from `D2` to `D13` (except `D7/D8`) and `A0–A2` is hardwired to an onboard sensor or actuator, use the `IIC (A4/A5)`, `D7/D8`, and `A3` headers when attaching external displays or servos.

Datasheet Reference:

• View Texas Instruments LM35 Precision Centigrade Temperature Sensor Datasheet PDF

Commonly Used in:

• K-12 & University STEM Arduino Programming Bootcamps
• Smart Home Weather, Light, and IR Remote Control Prototypes
• Hardware-in-the-Loop Sensor Calibration & Serial Plotter Demonstrations

Applications:

• Dual-Sensor Thermal Comparison: Plots both the analog LM35 reading (`A2`) and digital DHT11 reading (`D4`) on the Arduino IDE Serial Plotter simultaneously.
• PWM Color Mixing & Ambient Light Control: Uses the `A0` potentiometer or `A1` photoresistor to cross-fade the onboard `D9/D10/D11` RGB LED.
• Hardware Interrupt Labs: Because `SW1` and `SW2` are wired to hardware interrupt pins `D2 (INT0)` and `D3 (INT1)`, students can practice real-time ISR programming.

Equivalent Models:

• Multi-Function 74HC595 4-Digit 7-Segment Shield for UNO: Features an onboard 4-digit 7-segment display and plug-in LM35/DS18B20 socket instead of pre-soldered DHT11/LM35/LDR sensors.
• 37-in-1 Sensor Kit for Arduino: Separate individual breakout modules requiring breadboards and jumper cables.
• Arduino Sensor Shield V5.0: Pure breakout carrier board without pre-populated onboard sensors.

Package Includes:

• 1 × DHT11 & LM35 Temperature Humidity Multi-Function Easy Module Shield V1 for Arduino UNO