IR Infrared Obstacle Avoidance Tracking Sensor Module. Designed for infrared obstacle detection.

HC-SR04 Ultrasonic Sensor Module. Designed for measuring distance using ultrasonic signals.

4Pin LDR Module - Optical Sensitive Resistance Light Detection Sensor Module. A light-dependent resistor for light-sensing circuits.

HC-SR501 PIR Motion Sensor Module. Designed for detecting movement.

DHT11 Humidity and Temperature Sensor Module. Designed for monitoring temperature and humidity.

Motor Speed Encoder Sensor Module

• VCC Connect the positive 3.3 5 V power supply
• GND Connect power negative
• DO TTL switch signal output
• AO This module does not work

FC-28 Soil Moisture Module 3.3-5 V DC. An electronic module identified by its model and function.

• Input Voltage: 3.3V ? 5.5V DC
• Module size: 15mm x 11mm
• Stable touching detection of human body for replacing traditional direct switch key.
• AB=00:No-lock High TTL level output;
• AB=01:Self-lock High TTL level output;
• AB=10:No-lock Low TTL level output;
• AB=11:Self-lock Low TTL level output;