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The DS1307 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply
Distance measuring range: 15 cm to 150 cm
Output voltage range is DC 1
Uses Less than 300nA at 2
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DAC0808LCN (8-bit D/A Converter) soil moisture The DS1307 has a built-inIntroduction : DAC0808 is a D A converter IC and is used for converting 8 bit digital data input to analog signal output. It is a monolithic IC featuring a full scale output current settling time of 150 ns while dissipating only 33 mW with 5V supplies. The chip accuracy of conversion is good and power consumption is also low to make it popular. The power supply currents of the DAC0808 are independent of bit codes, and exhibits essentially constant