COMBO OF IR Proximity Sensor for Obstacle Sensing OR 5V One Channel Relay Module Relay Switch with Isolation High Low Level Trigger

the control dc or ac signal, you can control 220v ac load. there is a normally open and one normally closed contact. blue kf301 terminals to the control line is more convenient.Humidity and temperature.This is an Infrared based proximity sensor which are great for obstacle avoidance and line following robots.