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The Keyes-039 or KY039 Heart rate monitor consists of two things, an Infrared LED, and an Infrared Phototransistor. The IR LED should come on whenever the sensor has power and stay on (because it is infrared, you won’t be able to see that it is on, but if you look through your cell phone camera you will). The IR photo transistor causes the voltage to change on a “sensor” wire, and this should be connected to one of the Arduino’s analog pins.
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Description: -Brand new Black/White Line Hunting Sensor for Intelligent Car Tracing. -Features VCC/OUT/GND pin connector. -Output electrical level signal: Low level when detecting objects/ high level when no objects/0 or 1 decides if objects exist. -Power by 2.5-12V (cannot over 12V). -Perfect DIY parts for intelligent cars. -Color: Black panel -Working Current: 18-20mA at 5V -Package Dimensions: 77.0 x 49.0 x 12.0 mm -Weight: 5.0g
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The KY017 is a mercury tilt switch that allows you to detect the tilt of your object so that you can take the appropriate action. It is a nice low cost alternative to a 6 axis accelerometer. When strategically adjusted or situated, it can be very sensitive. The key to using this switch successfully is in understanding the two operational states.
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Description: Here we have a Joystick shield that sits atop your Arduino and turns it into a simple controller. 7 momentary push buttons (4 big buttons, 2 small buttons, and a joystick select button) and a two-axis thumb joystick gives your Arduino functionality on the level of the old Nintendo controllers.