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what xtal1 and xtal2 should be connected

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9
please explain what C2, C7, C6, +5V do.

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7
how to design a 5v power supply

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6
what this part do in the schemetic

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3
A7
A6
C8
Capacitance
0.1uF
ROW_2
SCK
LCD0
COL_1
LCD2
ROW_2
COL_3
MOSI
EN
ROW_1
RS
ROW_3
ROW_4
MISO
COL_2
ROW_1
LCD1
RW
MOSI
ROW_3
ROW_4
+5V
+5V
+5V
*
1
7
4
U1
Manufacturer Part Number
ATMEGA328P-MU
ISP


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Keypad lock Module isYa thumbnail
This module involves the design of a keypad lock system. It utilizes an ATMEGA328P microcontroller, buzzers, LEDs for indicator functions and a 4x3 matrix keypad. An in-circuit serial programming (ISP) header is also present for programming the microcontroller. #template #lock #keypad #reusable #module #simple-embedded #microchip #arduino #atmega328 #TPS613222A #ISP #buzzer #sublayout

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Pricing & Availability

Distributor

Qty 1

Digi-Key

$20.20–$64.70

LCSC

$8.84–$8.92

Mouser

$26.62

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