This project is a cheap rain sensor able to detect the occurrence of rain. The sensor automatically triggers a buzzer when a rain drop is detected and thus giving early indication of rain. The circuit is powered from AA batteries and it draws no current when in standby and consumes little power when the buzzer is on. It is easy to build and install.
Rain Detector Sensor - [Link]
This project is a speed detector based on Arduino platform. Arduino is measuring the time it takes an object to travel between two points and transmit this data to a computer or smart phone where it is converted to speed value and presented in a clear way. Check more details on code on the site below. [via]
Arduino Based Speed Detector - [Link]
IR detectors are little microchips with a photocell that are tuned to listen to infrared light. They are almost always used for remote control detection – every TV and DVD player has one of these in the front to listen for the IR signal from the clicker. Inside the remote control is a matching IR LED, which emits IR pulses to tell the TV to turn on, off or change channels. IR light is not visible to the human eye, which means it takes a little more work to test a setup.
In this tutorial we will show how to:
Test your IR sensor to make sure its working
Read raw IR codes into a microcontroller
Create a camera intervalometer
Listen for ‘commands’ from a remote control on your microcontroller
IR remote receiver-decoder tutorial - [Link]
Last week I had a big flood in my house. A water tube broke in the middle of the night making lots of damage. Wooden floor, furniture, small electronic appliances, all damaged due to the water. This made me think on a project that would sense water on the floor and trigger an alarm.
The detector should be able to sense water and trigger an alarm. Also it should be small and battery operated. Battery’s voltage should be checked also.
Flood Detector - [Link]
This is a mobile phone sniffer circuit that can detect the signals being used in the GSM (Global System for Mobile Communication) band at about 900 MHz. Since the signals are digitally encoded, it can detect only the signal activity, not the speech or the message contents. A headphone is used to hear the detected signals.
Cell Phone Detector - [Link]
The MLX90614 Infrared Thermometer Module from Parallax is an intelligent non-contact temperature sensor with a single pin serial interface for connection to most microcontrollers. The MLX90614 sensor is designed for non-contact temperature measurements of objects placed within the sensor’s cone of detection. The sensor is comprised of an integrated ASIC and infrared sensitive thermopile detector. The sensor communicates with an SX20AC/SS-G coprocessor over a digital SMBus, which Parallax has programmed to simplify an otherwise fairly complex communication protocol. With a temperature range of -70°C to 380°C, auto-baud detection and a programmable alarm setting, this module becomes very useful in many applications such as surface temperature measurement, human/animal presence detection or HVAC. Up to 100 modules can be connected on the same bus making multi-zone temperature measurement easy. [via] MLX90614 infrared thermometer module – [Link]
This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The battery-powered circuit draws virtually no current when the sensor is dry and the current consumption is low when the buzzer is activated so a couple of AA cells will last a long time. Alternately, a molded power supply with a simple voltage regulator to drop the voltage to 3 volts could be used. The circuit is basically a handy flasher circuit that operates well on only 3 volts using ordinary silicon transistors. When the circuit is triggered, the buzzer is pulsed about once per second. [via]
Rain Detector - [Link]
GoldPic 3 Pulse Induction Metal Detector Features :Fast Response Non-Motion All-Metal Silent Search Mode ,digital processing of the detection signal ,sensitive Analog / Digital Converter ,push Button Threshold Zeroing ,microprocessor Controlled ,liquid Crystal Display ,easy to build & use. [via]
GoldPic 3 Pulse Induction Metal Detector - [Link]
This project is for a small electronic unit that allows the user to sense the presence and relative signal strength of wireless hotspots like a Wi-Fi detector. It can be worn as a pendant or carried in a pocket. It is “always on” and communicates the presence and signal strength of an in-range hotspot by way of sequences of pulses – like a heartbeat you can feel. The stronger and faster the “heartbeat”, the stronger the wireless signal detected. [via]
Build your own Wireless Network detector - [Link]