DFRobot LM2577 DC-DC Boost Converter 3.7V to 34V bluetooth 4.0 Check the pin labels on

Check the pin labels on the Finger Clip Heart Rate Sensor and match them to your controller voltage

Both chips use I²C

or an SMS-controlled build

If using 3

Product Sensor Shield For Arduino Dimension 57mm x 57

DFRobot LM2577 DC-DC Boost Converter 3.7V to 34V bluetooth 4.0 Check the pin labels onDC DC Boost Converter. This is a multipurpose boost converter, a breakout board. The supply voltage is as low as 3. 7v and it boosts to as high as 34v. With this module, you can now power your Arduino with our 3. 7V LiPo battery or use it to regulate any other project. The tiny form factor and its simplicity make it a very nice addition for all projects requiring an extra power module. NOTE: This board does not have reverse polarity protection, so