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megadesk.sch
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$Comp
L Device:Buzzer BZ1
U 1 1 5AA5CDC1
P 5950 3500
F 0 "BZ1" H 6100 3550 50 0000 L CNN
F 1 "Buzzer" H 6100 3450 50 0000 L CNN
F 2 "!Greg:Buzzer_Murata_PKMCS0909E4000-R1-HAND-SOLDER" V 5925 3600 50 0001 C CNN
F 3 "" V 5925 3600 50 0001 C CNN
F 4 "PKMCS0909E4000-R1" H 5950 3500 50 0001 C CNN "Part Number"
F 5 "DNP" H 5950 3500 50 0001 C CNN "LCSC"
F 6 "Substition OK" H 5950 3500 50 0001 C CNN "Notes"
1 5950 3500
1 0 0 -1
$EndComp
Wire Wire Line
5150 3400 5850 3400
$Comp
L Device:R R1
U 1 1 5AA5D01D
P 5850 3750
F 0 "R1" V 5930 3750 50 0000 C CNN
F 1 "1k" V 5850 3750 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5780 3750 50 0001 C CNN
F 3 "" H 5850 3750 50 0001 C CNN
F 4 "C21190" H 5850 3750 50 0001 C CNN "LCSC"
F 5 "+/- 10% or better" H 5850 3750 50 0001 C CNN "Details"
1 5850 3750
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR022
U 1 1 5AA5D0C5
P 5850 3900
F 0 "#PWR022" H 5850 3650 50 0001 C CNN
F 1 "GND" H 5850 3750 50 0000 C CNN
F 2 "" H 5850 3900 50 0001 C CNN
F 3 "" H 5850 3900 50 0001 C CNN
1 5850 3900
1 0 0 -1
$EndComp
$Comp
L power:PWR_FLAG #FLG023
U 1 1 5AA6E640
P 7850 1100
F 0 "#FLG023" H 7850 1175 50 0001 C CNN
F 1 "PWR_FLAG" H 7850 1250 50 0000 C CNN
F 2 "" H 7850 1100 50 0001 C CNN
F 3 "" H 7850 1100 50 0001 C CNN
1 7850 1100
1 0 0 -1
$EndComp
$Comp
L power:+24V #PWR024
U 1 1 5AA6E682
P 8200 1100
F 0 "#PWR024" H 8200 950 50 0001 C CNN
F 1 "+24V" H 8200 1240 50 0000 C CNN
F 2 "" H 8200 1100 50 0001 C CNN
F 3 "" H 8200 1100 50 0001 C CNN
1 8200 1100
1 0 0 -1
$EndComp
Wire Wire Line
8200 1100 7850 1100
$Comp
L power:PWR_FLAG #FLG025
U 1 1 5AA6F82E
P 7850 1400
F 0 "#FLG025" H 7850 1475 50 0001 C CNN
F 1 "PWR_FLAG" H 7850 1550 50 0000 C CNN
F 2 "" H 7850 1400 50 0001 C CNN
F 3 "" H 7850 1400 50 0001 C CNN
1 7850 1400
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR026
U 1 1 5AA6F869
P 8200 1400
F 0 "#PWR026" H 8200 1150 50 0001 C CNN
F 1 "GND" H 8200 1250 50 0000 C CNN
F 2 "" H 8200 1400 50 0001 C CNN
F 3 "" H 8200 1400 50 0001 C CNN
1 8200 1400
1 0 0 -1
$EndComp
Wire Wire Line
7850 1400 8200 1400
Text Notes 6000 3800 0 40 ~ 0
Volume control
Wire Notes Line
5700 3300 5700 4150
Wire Notes Line
5700 4150 6800 4150
Wire Notes Line
6800 4150 6800 3300
Wire Notes Line
6800 3300 5700 3300
Text Notes 5950 4250 0 60 ~ 0
Optional beeper
Wire Wire Line
7800 2750 7800 2650
Wire Wire Line
4550 2400 4550 2350
Wire Wire Line
2150 1000 2150 1400
Wire Notes Line
3350 700 3350 1950
Wire Notes Line
600 700 600 1950
Connection ~ 1750 1000
Wire Wire Line
1750 1000 2150 1000
Wire Wire Line
750 1000 750 1400
Wire Wire Line
750 1000 1750 1000
NoConn ~ 5150 3800
NoConn ~ 5150 3000
NoConn ~ 5150 2700
NoConn ~ 7600 2750
NoConn ~ 5850 850
NoConn ~ 5850 950
NoConn ~ 5850 1050
NoConn ~ 5850 1150
NoConn ~ 5850 1550
NoConn ~ 5850 1650
NoConn ~ 5850 1750
$Comp
L Connector:AVR-ISP-6 J3
U 1 1 5DBF5698
P 2500 3300
F 0 "J3" H 2171 3396 50 0000 R CNN
F 1 "AVR-ISP-6" H 2171 3305 50 0000 R CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical" V 2250 3350 50 0001 C CNN
F 3 " ~" H 1225 2750 50 0001 C CNN
F 4 "DNP" H 2500 3300 50 0001 C CNN "LCSC"
F 5 "DNP" H 2500 3300 50 0001 C CNN "Part Number"
1 2500 3300
1 0 0 -1
$EndComp
Text GLabel 3000 3300 2 47 Output ~ 0
SCK
Text GLabel 3000 3200 2 47 Output ~ 0
MOSI
Text GLabel 3000 3100 2 47 Output ~ 0
MISO
Text GLabel 3000 3400 2 47 Output ~ 0
RST
$Comp
L power:GND #PWR0101
U 1 1 5DBF890F
P 2400 3700
F 0 "#PWR0101" H 2400 3450 50 0001 C CNN
F 1 "GND" H 2400 3550 50 0000 C CNN
F 2 "" H 2400 3700 50 0001 C CNN
F 3 "" H 2400 3700 50 0001 C CNN
1 2400 3700
1 0 0 -1
$EndComp
$Comp
L power:+5V #PWR0102
U 1 1 5DBF915C
P 2400 2800
F 0 "#PWR0102" H 2400 2650 50 0001 C CNN
F 1 "+5V" H 2400 2940 50 0000 C CNN
F 2 "" H 2400 2800 50 0001 C CNN
F 3 "" H 2400 2800 50 0001 C CNN
1 2400 2800
1 0 0 -1
$EndComp
Wire Wire Line
2900 3400 3000 3400
Wire Wire Line
3000 3300 2900 3300
Wire Wire Line
2900 3200 3000 3200
Wire Wire Line
3000 3100 2900 3100
Wire Wire Line
1200 1700 1800 1700
Wire Wire Line
1500 1400 1800 1400
Wire Wire Line
6300 2650 6650 2650
Wire Wire Line
7600 3050 8400 3050
Wire Notes Line
4000 700 4000 1950
Wire Notes Line
4000 700 6350 700
Wire Notes Line
4000 1950 6350 1950
Wire Notes Line
6350 700 6350 1950
$Comp
L !Custom:MCP2003B U4
U 1 1 5EF811C0
P 7200 2950
F 0 "U4" H 7200 3375 50 0000 C CNN
F 1 "MCP2003B" H 7200 3284 50 0000 C CNN
F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 7200 2500 50 0001 C CNN
F 3 "" H 7300 2950 50 0001 C CNN
F 4 "DNP" H 7200 2950 50 0001 C CNN "LCSC"
F 5 "MCP2003BT-E/SNTR" H 7200 2950 50 0001 C CNN "Part Number"
1 7200 2950
1 0 0 -1
$EndComp
Wire Wire Line
3650 2300 3650 2350
Wire Wire Line
3650 2350 4550 2350
Connection ~ 3650 2350
Wire Wire Line
3650 2650 3650 2700
Wire Wire Line
2800 1400 3100 1400
Wire Wire Line
3100 1400 3200 1400
Wire Wire Line
3200 1400 3200 1300
Connection ~ 3100 1400
Wire Wire Line
3200 1700 3100 1700
Wire Wire Line
3100 1700 2500 1700
Connection ~ 3100 1700
Connection ~ 1800 1400
Wire Wire Line
1800 1400 1900 1400
Connection ~ 1800 1700
Wire Wire Line
1800 1700 1900 1700
Connection ~ 750 1400
Connection ~ 6650 2650
Wire Wire Line
6650 2650 6800 2650
Connection ~ 8600 3050
Wire Wire Line
8600 3050 9100 3050
Connection ~ 8400 3050
Wire Wire Line
8400 3050 8600 3050
$Comp
L MCU_Microchip_ATtiny:ATtiny841-SS U3
U 1 1 5F8D16D9
P 4550 3300
F 0 "U3" H 4021 3346 50 0000 R CNN
F 1 "ATtiny841-SS" H 4021 3255 50 0000 R CNN
F 2 "Package_SO:SOIC-14_3.9x8.7mm_P1.27mm" H 4550 3300 50 0001 C CIN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8495-8-bit-AVR-Microcontrollers-ATtiny441-ATtiny841_Datasheet.pdf" H 4550 3300 50 0001 C CNN
F 4 "DNP" H 4550 3300 50 0001 C CNN "LCSC"
F 5 "ATTINY841-SSURTR" H 4550 3300 50 0001 C CNN "Part Number"
1 4550 3300
1 0 0 -1
$EndComp
$EndSCHEMATC