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These modules come with flash memory to store the fingerprints and work with any microcontroller or system with TTL serial
5V Full Operation
MQ2 gas sensor is an electronic sensor used for sensing the concentration of gases in the air such as LPG
Access control system
Support three modes: AP
74HC161 ( Presettable synchronous 4-bit binary counter-asynchronous reset) Gripper Arm with Base These modules come with flashIntroduction : 74HC161 is a synchronous presettable binary counter with an internal look head carry. Synchronous operation is provided by having all flip flops clocked simultaneously on the positive going edge of the clock (CP). The outputs (Q0 to Q3) of the counters may be preset HIGH or LOW. A LOW at the parallel enable input (PE) disables the counting action and causes the data at thedata inputs (D0 to D3) to be loaded into the counter on the
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