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This is a good quality heat shrink
Simply clip the Pulse Sensor to your earlobe or finger tip and plug it into your 3 or 5 Volt Arduino and you're ready to read heart rate
This way you are able to use one cable for power and data at the same time
Sound recorder Arduino code
Widely applicable
RS232 to TTL Converter (MAX232) TLC7528CN This is a good qualityMaxims MAX232 is one of those wonderful components that solves so many signal conversion problems. This chip converts RS232 signal voltage levels to TTL voltage levels and visa versa. Hence if you need to communicate to your PC through it's serial port (COM1 or COM2) then this is the chip that can perform that function. If you have a microcontroller circuit, or a phone, or a calculator that requires a PC connection then this is the chip that is needed
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