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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. -
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 -
Kusam-meco 801-L Digital Multimeter (Yellow 4000 Counts) PHY-289 Sensing : Average Sensing. Basic Accuracy : ±(0.5%rdg 1dgt) Display : 3 ¾ digit Max. 3999 Counts Large LCD display Display Size : 17.5 mm Polarity : Automatic, positive implied, (-) negative polarity indication Measurement Rate : 2.5 measurements / sec. Over range Indication : 'OL' is displayed. Low battery : The " " sign is displayed when the battery voltage drops below the operating Voltage. Operating Temperature : Storage Temperature : -20 °C to 60 °C;< 80%R.H. (With Battery Removed) Power : Single, Standard 9V battery.

