EESchema Schematic File Version 4 EELAYER 30 0 EELAYER END $Descr A4 11693 8268 encoding utf-8 Sheet 1 1 Title "" Date "" Rev "" Comp "" Comment1 "" Comment2 "" Comment3 "" Comment4 "" $EndDescr $Comp L Device:R R5 U 1 1 604E2CEB P 5000 1950 F 0 "R5" H 5070 1996 50 0000 L CNN F 1 "10k" H 5070 1905 50 0000 L CNN F 2 "" V 4930 1950 50 0001 C CNN F 3 "~" H 5000 1950 50 0001 C CNN 1 5000 1950 1 0 0 -1 $EndComp $Comp L Transistor_BJT:BC327 Q2 U 1 1 604E30F3 P 5250 2200 F 0 "Q2" H 5441 2154 50 0000 L CNN F 1 "BC327" H 5441 2245 50 0000 L CNN F 2 "Package_TO_SOT_THT:TO-92_Inline" H 5450 2125 50 0001 L CIN F 3 "http://www.onsemi.com/pub_link/Collateral/BC327-D.PDF" H 5250 2200 50 0001 L CNN 1 5250 2200 1 0 0 1 $EndComp $Comp L Transistor_BJT:BC337 Q1 U 1 1 604E3992 P 4400 2550 F 0 "Q1" H 4591 2596 50 0000 L CNN F 1 "BC337" H 4591 2505 50 0000 L CNN F 2 "Package_TO_SOT_THT:TO-92_Inline" H 4600 2475 50 0001 L CIN F 3 "https://diotec.com/tl_files/diotec/files/pdf/datasheets/bc337.pdf" H 4400 2550 50 0001 L CNN 1 4400 2550 1 0 0 -1 $EndComp $Comp L Connector:Conn_01x01_Female Jbat1 U 1 1 604E465F P 1450 1700 F 0 "Jbat1" H 1342 1475 50 0000 C CNN F 1 "bat_positive" H 1342 1566 50 0000 C CNN F 2 "" H 1450 1700 50 0001 C CNN F 3 "~" H 1450 1700 50 0001 C CNN 1 1450 1700 -1 0 0 1 $EndComp $Comp L Connector:Conn_01x01_Female Jbat2 U 1 1 604E5347 P 1500 3050 F 0 "Jbat2" H 1392 2825 50 0000 C CNN F 1 "bat_negative" H 1392 2916 50 0000 C CNN F 2 "" H 1500 3050 50 0001 C CNN F 3 "~" H 1500 3050 50 0001 C CNN 1 1500 3050 -1 0 0 1 $EndComp $Comp L Connector:Conn_01x01_Female Jout1 U 1 1 604E571D P 6450 2400 F 0 "Jout1" H 6478 2426 50 0000 L CNN F 1 "output_positive" H 6478 2335 50 0000 L CNN F 2 "" H 6450 2400 50 0001 C CNN F 3 "~" H 6450 2400 50 0001 C CNN 1 6450 2400 1 0 0 -1 $EndComp $Comp L Connector:Conn_01x01_Female Jout2 U 1 1 604E59B9 P 6450 3050 F 0 "Jout2" H 6478 3076 50 0000 L CNN F 1 "output_negative" H 6478 2985 50 0000 L CNN F 2 "" H 6450 3050 50 0001 C CNN F 3 "~" H 6450 3050 50 0001 C CNN 1 6450 3050 1 0 0 -1 $EndComp $Comp L power:GND #PWR01 U 1 1 604E7C2A P 1850 3200 F 0 "#PWR01" H 1850 2950 50 0001 C CNN F 1 "GND" H 1855 3027 50 0000 C CNN F 2 "" H 1850 3200 50 0001 C CNN F 3 "" H 1850 3200 50 0001 C CNN 1 1850 3200 1 0 0 -1 $EndComp $Comp L power:GND #PWR05 U 1 1 604E7ED1 P 6200 3350 F 0 "#PWR05" H 6200 3100 50 0001 C CNN F 1 "GND" H 6205 3177 50 0000 C CNN F 2 "" H 6200 3350 50 0001 C CNN F 3 "" H 6200 3350 50 0001 C CNN 1 6200 3350 1 0 0 -1 $EndComp Wire Wire Line 6250 3050 6200 3050 Wire Wire Line 6200 3050 6200 3350 Wire Wire Line 1700 3050 1850 3050 Wire Wire Line 1850 3050 1850 3200 $Comp L Diode:1N4148 D2 U 1 1 604E97D0 P 6000 2400 F 0 "D2" H 6000 2183 50 0000 C CNN F 1 "1N4148" H 6000 2274 50 0000 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 6000 2225 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 6000 2400 50 0001 C CNN 1 6000 2400 -1 0 0 1 $EndComp Wire Wire Line 6250 2400 6150 2400 Wire Wire Line 5850 2400 5550 2400 Wire Wire Line 5350 1700 5350 2000 Wire Wire Line 5000 1800 5000 1700 Connection ~ 5000 1700 Wire Wire Line 5000 1700 5350 1700 Wire Wire Line 5050 2200 5000 2200 Wire Wire Line 5000 2200 5000 2100 $Comp L Device:R R4 U 1 1 604FFABC P 4700 2200 F 0 "R4" V 4907 2200 50 0000 C CNN F 1 "100" V 4816 2200 50 0000 C CNN F 2 "" V 4630 2200 50 0001 C CNN F 3 "~" H 4700 2200 50 0001 C CNN 1 4700 2200 0 -1 -1 0 $EndComp Wire Wire Line 4850 2200 5000 2200 Connection ~ 5000 2200 Wire Wire Line 4500 2350 4500 2200 Wire Wire Line 4500 2200 4550 2200 $Comp L Device:R R6 U 1 1 60500C69 P 5550 2550 F 0 "R6" H 5620 2596 50 0000 L CNN F 1 "2k2" H 5620 2505 50 0000 L CNN F 2 "" V 5480 2550 50 0001 C CNN F 3 "~" H 5550 2550 50 0001 C CNN 1 5550 2550 1 0 0 -1 $EndComp Connection ~ 5550 2400 Wire Wire Line 5550 2400 5350 2400 $Comp L Device:R R7 U 1 1 60501346 P 5550 3000 F 0 "R7" H 5620 3046 50 0000 L CNN F 1 "1k" H 5620 2955 50 0000 L CNN F 2 "" V 5480 3000 50 0001 C CNN F 3 "~" H 5550 3000 50 0001 C CNN 1 5550 3000 1 0 0 -1 $EndComp Wire Wire Line 5550 2850 5550 2750 $Comp L power:GND #PWR04 U 1 1 60503378 P 5550 3350 F 0 "#PWR04" H 5550 3100 50 0001 C CNN F 1 "GND" H 5555 3177 50 0000 C CNN F 2 "" H 5550 3350 50 0001 C CNN F 3 "" H 5550 3350 50 0001 C CNN 1 5550 3350 1 0 0 -1 $EndComp Wire Wire Line 5550 3350 5550 3150 $Comp L Connector:Conn_01x01_Female Js1 U 1 1 60503D41 P 6450 2750 F 0 "Js1" H 6478 2776 50 0000 L CNN F 1 "vbat_sense" H 6478 2685 50 0000 L CNN F 2 "" H 6450 2750 50 0001 C CNN F 3 "~" H 6450 2750 50 0001 C CNN 1 6450 2750 1 0 0 -1 $EndComp Wire Wire Line 6250 2750 5550 2750 Connection ~ 5550 2750 Wire Wire Line 5550 2750 5550 2700 $Comp L Device:R R3 U 1 1 6050F9A6 P 4100 2800 F 0 "R3" H 4170 2846 50 0000 L CNN F 1 "10k" H 4170 2755 50 0000 L CNN F 2 "" V 4030 2800 50 0001 C CNN F 3 "~" H 4100 2800 50 0001 C CNN 1 4100 2800 1 0 0 -1 $EndComp Wire Wire Line 4200 2550 4100 2550 Wire Wire Line 4100 2550 4100 2650 $Comp L Connector:Conn_01x01_Female Jt3 U 1 1 6051059E P 2900 2350 F 0 "Jt3" H 2750 2400 50 0000 C CNN F 1 "touch_negative" H 3200 2350 50 0000 C CNN F 2 "" H 2900 2350 50 0001 C CNN F 3 "~" H 2900 2350 50 0001 C CNN 1 2900 2350 -1 0 0 1 $EndComp $Comp L power:GND #PWR03 U 1 1 60511BF1 P 4500 3350 F 0 "#PWR03" H 4500 3100 50 0001 C CNN F 1 "GND" H 4505 3177 50 0000 C CNN F 2 "" H 4500 3350 50 0001 C CNN F 3 "" H 4500 3350 50 0001 C CNN 1 4500 3350 1 0 0 -1 $EndComp Wire Wire Line 4500 3350 4500 3100 Wire Wire Line 4100 2950 4100 3100 Wire Wire Line 4100 3100 4500 3100 Connection ~ 4500 3100 Wire Wire Line 4500 3100 4500 2750 $Comp L Connector:Conn_01x01_Female Jt1 U 1 1 60517CF8 P 2900 2050 F 0 "Jt1" H 2700 2100 50 0000 L CNN F 1 "touch_positive" H 2950 2050 50 0000 L CNN F 2 "" H 2900 2050 50 0001 C CNN F 3 "~" H 2900 2050 50 0001 C CNN 1 2900 2050 -1 0 0 1 $EndComp $Comp L Connector:Conn_01x01_Female Jt2 U 1 1 60518072 P 2900 2200 F 0 "Jt2" H 2750 2250 50 0000 C CNN F 1 "touch_signal" H 3200 2200 50 0000 C CNN F 2 "" H 2900 2200 50 0001 C CNN F 3 "~" H 2900 2200 50 0001 C CNN 1 2900 2200 -1 0 0 1 $EndComp $Comp L Device:R R1 U 1 1 60518D78 P 3700 2200 F 0 "R1" V 3493 2200 50 0000 C CNN F 1 "1k" V 3584 2200 50 0000 C CNN F 2 "" V 3630 2200 50 0001 C CNN F 3 "~" H 3700 2200 50 0001 C CNN 1 3700 2200 0 1 1 0 $EndComp $Comp L Device:R R2 U 1 1 605193A0 P 3700 2500 F 0 "R2" V 3493 2500 50 0000 C CNN F 1 "1k" V 3584 2500 50 0000 C CNN F 2 "" V 3630 2500 50 0001 C CNN F 3 "~" H 3700 2500 50 0001 C CNN 1 3700 2500 0 1 1 0 $EndComp Wire Wire Line 3850 2500 4100 2500 Wire Wire Line 4100 2500 4100 2550 Connection ~ 4100 2550 Wire Wire Line 4100 2500 4100 2200 Wire Wire Line 4100 2200 3850 2200 Connection ~ 4100 2500 Wire Wire Line 3550 2200 3100 2200 $Comp L Device:LED D1 U 1 1 60536DA5 P 3250 1850 F 0 "D1" V 3289 1732 50 0000 R CNN F 1 "LED" V 3198 1732 50 0000 R CNN F 2 "" H 3250 1850 50 0001 C CNN F 3 "~" H 3250 1850 50 0001 C CNN 1 3250 1850 0 -1 -1 0 $EndComp Wire Wire Line 3250 2000 3250 2050 Wire Wire Line 3250 2050 3100 2050 Connection ~ 3250 1700 Wire Wire Line 3250 1700 5000 1700 Wire Wire Line 1650 1700 1850 1700 $Comp L power:GND #PWR02 U 1 1 605429CF P 3200 3200 F 0 "#PWR02" H 3200 2950 50 0001 C CNN F 1 "GND" H 3205 3027 50 0000 C CNN F 2 "" H 3200 3200 50 0001 C CNN F 3 "" H 3200 3200 50 0001 C CNN 1 3200 3200 1 0 0 -1 $EndComp Wire Wire Line 3200 3200 3200 2350 Wire Wire Line 3200 2350 3100 2350 Text Notes 3100 1650 0 50 ~ 0 LED for dropping voltage\nfrom 6-8.4v to around 5v $Comp L Connector:Conn_01x01_Female Jen1 U 1 1 6054FCD6 P 2900 2500 F 0 "Jen1" H 2750 2550 50 0000 C CNN F 1 "enable" H 3200 2500 50 0000 C CNN F 2 "" H 2900 2500 50 0001 C CNN F 3 "~" H 2900 2500 50 0001 C CNN 1 2900 2500 -1 0 0 1 $EndComp Wire Wire Line 3100 2500 3550 2500 Text Notes 5900 2100 0 50 ~ 0 0.6V voltage drop\nneeded if battery is full (8.4V)\nvoltage drop of transistor not sufficient Text Notes 7100 2550 0 50 ~ 0 Output voltage range with 2S LiPo\nwill be good enough for 3v3 reg\non esp8266 Text Notes 1100 1350 0 50 ~ 0 2S LiPo Battery. 6V - 8.4V\nAdditional BMS is recommended $Comp L Device:CP C? U 1 1 6055C859 P 1850 1950 F 0 "C?" H 1968 1996 50 0000 L CNN F 1 "10uF" H 1968 1905 50 0000 L CNN F 2 "" H 1888 1800 50 0001 C CNN F 3 "~" H 1850 1950 50 0001 C CNN 1 1850 1950 1 0 0 -1 $EndComp Wire Wire Line 1850 1800 1850 1700 Connection ~ 1850 1700 Wire Wire Line 1850 1700 3250 1700 Wire Wire Line 1850 2100 1850 3050 Connection ~ 1850 3050 Text Notes 2450 1900 0 50 ~ 0 Debo Touch Wire Notes Line 2300 1800 2900 1800 Wire Notes Line 2900 1800 2900 2450 Wire Notes Line 2900 2450 2300 2450 Wire Notes Line 2300 2450 2300 1800 $EndSCHEMATC