EESchema Schematic File Version 2 LIBS:power LIBS:device LIBS:switches LIBS:relays LIBS:motors LIBS:transistors LIBS:conn LIBS:linear LIBS:regul LIBS:74xx LIBS:cmos4000 LIBS:adc-dac LIBS:memory LIBS:xilinx LIBS:microcontrollers LIBS:dsp LIBS:microchip LIBS:analog_switches LIBS:motorola LIBS:texas LIBS:intel LIBS:audio LIBS:interface LIBS:digital-audio LIBS:philips LIBS:display LIBS:cypress LIBS:siliconi LIBS:opto LIBS:atmel LIBS:contrib LIBS:valves LIBS:lts LIBS:lts-proto-cache EELAYER 25 0 EELAYER END $Descr USLetter 11000 8500 encoding utf-8 Sheet 2 3 Title "LCD Interface" Date "2018-02-06" Rev "AA" Comp "Let's Talk Science" Comment1 "Shawn Nock " Comment2 "" Comment3 "" Comment4 "" $EndDescr $Comp L MCP23008 U5 U 1 1 5A7C83AC P 4450 3550 F 0 "U5" H 4350 4175 50 0000 R CNN F 1 "MCP23008" H 4350 4100 50 0000 R CNN F 2 "Housings_SOIC:SOIC-18W_7.5x11.6mm_Pitch1.27mm" H 4500 2900 50 0001 L CNN F 3 "" H 4700 4150 50 0001 C CNN 1 4450 3550 -1 0 0 -1 $EndComp $Comp L RC1602A U6 U 1 1 5A7C8DE4 P 6350 3450 F 0 "U6" H 6100 4100 50 0000 C CNN F 1 "RC1602A" H 6460 4100 50 0000 L CNN F 2 "lts:NHD-0216BZ" H 6450 2650 50 0001 C CNN F 3 "" H 6450 3350 50 0001 C CNN 1 6350 3450 1 0 0 -1 $EndComp Wire Wire Line 4950 3950 5950 3950 Wire Wire Line 4950 3850 5950 3850 Wire Wire Line 4950 3750 5950 3750 Wire Wire Line 4950 3650 5950 3650 Wire Wire Line 4950 3250 5500 3250 Wire Wire Line 5500 3250 5500 2950 Wire Wire Line 5500 2950 5950 2950 Wire Wire Line 5950 3150 5700 3150 Wire Wire Line 5700 3150 5700 3350 Wire Wire Line 3950 3550 3700 3550 Text GLabel 3700 3550 0 45 Input ~ 0 SCL Text GLabel 3700 3650 0 45 Input ~ 0 SDA $Comp L R R11 U 1 1 5A7C8F8D P 3800 2900 F 0 "R11" V 3880 2900 50 0000 C CNN F 1 "10k" V 3800 2900 50 0000 C CNN F 2 "Resistors_SMD:R_0603_HandSoldering" V 3730 2900 50 0001 C CNN F 3 "" H 3800 2900 50 0001 C CNN 1 3800 2900 1 0 0 -1 $EndComp Wire Wire Line 3950 3150 3800 3150 Wire Wire Line 3800 3150 3800 3050 Wire Wire Line 3800 2750 4450 2750 Wire Wire Line 4450 2750 4450 2950 $Comp L +3.3V #PWR031 U 1 1 5A7C903C P 4450 2750 F 0 "#PWR031" H 4450 2600 50 0001 C CNN F 1 "+3.3V" H 4450 2890 50 0000 C CNN F 2 "" H 4450 2750 50 0001 C CNN F 3 "" H 4450 2750 50 0001 C CNN 1 4450 2750 1 0 0 -1 $EndComp Connection ~ 4450 2750 $Comp L GND #PWR032 U 1 1 5A7C906B P 5950 3050 F 0 "#PWR032" H 5950 2800 50 0001 C CNN F 1 "GND" H 5950 2900 50 0000 C CNN F 2 "" H 5950 3050 50 0001 C CNN F 3 "" H 5950 3050 50 0001 C CNN 1 5950 3050 0 1 1 0 $EndComp $Comp L POT RV1 U 1 1 5A7C908B P 7150 3250 F 0 "RV1" V 6975 3250 50 0000 C CNN F 1 "10k" V 7050 3250 50 0000 C CNN F 2 "lts:Bournes_TC33x-2_HandSoldering" H 7150 3250 50 0001 C CNN F 3 "" H 7150 3250 50 0001 C CNN 1 7150 3250 -1 0 0 1 $EndComp Wire Wire Line 6350 2750 7150 2750 Wire Wire Line 7150 2750 7150 3100 Wire Wire Line 7150 4250 7150 3400 Wire Wire Line 6750 3250 7000 3250 $Comp L +5V #PWR033 U 1 1 5A7C914F P 7150 2750 F 0 "#PWR033" H 7150 2600 50 0001 C CNN F 1 "+5V" H 7150 2890 50 0000 C CNN F 2 "" H 7150 2750 50 0001 C CNN F 3 "" H 7150 2750 50 0001 C CNN 1 7150 2750 1 0 0 -1 $EndComp Connection ~ 7150 2750 Wire Wire Line 6750 3650 6950 3650 Wire Wire Line 6750 3750 6950 3750 Wire Wire Line 3950 3850 3950 4250 Connection ~ 3950 3950 Wire Wire Line 3950 4250 7150 4250 Connection ~ 3950 4050 Wire Wire Line 3700 3650 3950 3650 Wire Wire Line 6350 4250 6350 4150 Connection ~ 4450 4250 Connection ~ 6350 4250 $Comp L GND #PWR034 U 1 1 5A7C9852 P 5450 4250 F 0 "#PWR034" H 5450 4000 50 0001 C CNN F 1 "GND" H 5450 4100 50 0000 C CNN F 2 "" H 5450 4250 50 0001 C CNN F 3 "" H 5450 4250 50 0001 C CNN 1 5450 4250 1 0 0 -1 $EndComp Connection ~ 5450 4250 Wire Notes Line 5150 2400 5150 4550 Wire Notes Line 5150 4550 3300 4550 Wire Notes Line 3300 4550 3300 2400 Wire Notes Line 3300 2400 5150 2400 Wire Notes Line 5650 2400 5650 4550 Wire Notes Line 7450 2400 7450 4550 Wire Notes Line 7450 2400 5650 2400 Text Notes 5700 2500 0 60 ~ 0 LCD Controller Text Notes 3350 2500 0 60 ~ 0 I2C GPIO Expander Wire Wire Line 5700 3350 4950 3350 Wire Notes Line 7450 4550 5650 4550 $Comp L VBUS #PWR035 U 1 1 5A7CABC5 P 6950 3750 F 0 "#PWR035" H 6950 3600 50 0001 C CNN F 1 "VBUS" H 6950 3900 50 0000 C CNN F 2 "" H 6950 3750 50 0001 C CNN F 3 "" H 6950 3750 50 0001 C CNN 1 6950 3750 -1 0 0 1 $EndComp $Comp L GND #PWR036 U 1 1 5A7CAC10 P 6950 3650 F 0 "#PWR036" H 6950 3400 50 0001 C CNN F 1 "GND" H 6950 3500 50 0000 C CNN F 2 "" H 6950 3650 50 0001 C CNN F 3 "" H 6950 3650 50 0001 C CNN 1 6950 3650 -1 0 0 1 $EndComp NoConn ~ 3950 3250 NoConn ~ 5950 3550 NoConn ~ 5950 3450 NoConn ~ 5950 3350 NoConn ~ 5950 3250 NoConn ~ 4950 3450 NoConn ~ 4950 3550 $Comp L PWR_FLAG #FLG037 U 1 1 5A7EECF1 P 6900 3250 F 0 "#FLG037" H 6900 3325 50 0001 C CNN F 1 "PWR_FLAG" H 6900 3400 50 0000 C CNN F 2 "" H 6900 3250 50 0001 C CNN F 3 "" H 6900 3250 50 0001 C CNN 1 6900 3250 1 0 0 -1 $EndComp Connection ~ 6900 3250 Text Notes 4600 4550 0 45 ~ 0 I2C Addr.: 0x20 $Comp L C C10 U 1 1 5A7E61BD P 3500 2900 F 0 "C10" H 3525 3000 50 0000 L CNN F 1 "0.1uF" H 3525 2800 50 0000 L CNN F 2 "Capacitors_SMD:C_0603_HandSoldering" H 3538 2750 50 0001 C CNN F 3 "" H 3500 2900 50 0001 C CNN 1 3500 2900 1 0 0 -1 $EndComp $Comp L +3.3V #PWR038 U 1 1 5A7E6217 P 3500 2750 F 0 "#PWR038" H 3500 2600 50 0001 C CNN F 1 "+3.3V" H 3500 2890 50 0000 C CNN F 2 "" H 3500 2750 50 0001 C CNN F 3 "" H 3500 2750 50 0001 C CNN 1 3500 2750 1 0 0 -1 $EndComp $Comp L GND #PWR039 U 1 1 5A7E623A P 3500 3050 F 0 "#PWR039" H 3500 2800 50 0001 C CNN F 1 "GND" H 3500 2900 50 0000 C CNN F 2 "" H 3500 3050 50 0001 C CNN F 3 "" H 3500 3050 50 0001 C CNN 1 3500 3050 1 0 0 -1 $EndComp $EndSCHEMATC