Other sensor circuit diagrams

Touch Counter

The counter is advanced by one touching a wire of the LED, Suitable for many applications

Power Outage Warning

5 to 15V supply - LED indicator. Adjustable time detection

Live-line Detector

Detects the presence of a live mains conductor Minimum parts counting

Capacitive Sensor

Special design for shop-windows animation. Useful for many types of touch controls

Cellular Phone calling Detector

Flashes a LED when detecting an incoming call Powered by one 1.5V cell

Arduino MQ-7 Carbon Monoxide Sensor Circuit

The carbon monoxide sensor we will use is the MQ-7 sensor. This is a sensor that is sensitive to effects of CO. Carbon monoxide (CO) is a very dangerous gas which is odorless, colorless, and tasteless, so it cannot be smelt, seen, or tasted. A person really would have no idea that they are breathing in CO besides the fact that they would start to feel horrible.

AC Current Monitor

Senses high current-flow into power cables No wire-cutting, three versions available

Magnetic-Radiation Remote-Control

Short-range 35KHz operation, single-channel units. Simple circuitry, no outer antennas required

Volumetric Sensor Alarm

Detects small variations in air pressure. Can be battery powered (6/12V)

Mini Touch Alert

Connecting it to the door handle, it constitutes an effective as economic alert for your room, office, lab, or even drawer.