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Only three wires are required to communicate with the clock/RAM: CE
Serial I/O for Minimum Pin Count
a robot can be designed to be a master connected to a slave Bluetooth module or as a slave board to make a wireless connection with a PC and smart phones
9 V (typical)
74HC164 (8-bit Serial-in/parallel-out Shift Register) soil moisture Only three wires are requiredIntroduction : 74HC164 is an 8 bit serial in parallel out shift register. The device features twoserial data inputs (DSA and DSB), eight parallel data outputs (Q0 to Q7). Data is entered seriallythrough DSA or DSB and either input can be used as an active HIGH enable for data entry throughthe other input. Data is shifted on the LOW to HIGH transitions of the clock (CP) input. A LOW onthe master reset input (MR) clears the register and forces all
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