==Other resource==
* Chip-Specifications：[[File:MAX17040-MAX17041.pdf]]
*[https://www.sparkfun.com/datasheets/Components/DS1307.pdf I2C address: 0x36 for battery fuel gauging, 0x68 for RTC]*References: [https://www.instructables.com/Raspberry-Pi-Tutorial-How-to-Use-a-Buzzer/ Raspberry Pi Tutorial: How to Use a Buzzer]
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