| EESchema Schematic File Version 4 |
| LIBS:Remote2-cache |
| EELAYER 29 0 |
| EELAYER END |
| $Descr A4 11693 8268 |
| encoding utf-8 |
| Sheet 1 1 |
| Title "" |
| Date "" |
| Rev "" |
| Comp "" |
| Comment1 "" |
| Comment2 "" |
| Comment3 "" |
| Comment4 "" |
| $EndDescr |
| Wire Wire Line |
| 3850 2850 3850 1900 |
| $Comp |
| L power:+5V #PWR? |
| U 1 1 5D7C291E |
| P 3850 1750 |
| F 0 "#PWR?" H 3850 1600 50 0001 C CNN |
| F 1 "+5V" H 3865 1923 50 0000 C CNN |
| F 2 "" H 3850 1750 50 0001 C CNN |
| F 3 "" H 3850 1750 50 0001 C CNN |
| 1 3850 1750 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 3850 1750 3850 1900 |
| Connection ~ 3850 1900 |
| $Comp |
| L power:PWR_FLAG #FLG? |
| U 1 1 5D816C92 |
| P 4400 1900 |
| F 0 "#FLG?" H 4400 1975 50 0001 C CNN |
| F 1 "PWR_FLAG" H 4400 2073 50 0000 C CNN |
| F 2 "" H 4400 1900 50 0001 C CNN |
| F 3 "~" H 4400 1900 50 0001 C CNN |
| 1 4400 1900 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 4400 1900 3850 1900 |
| Wire Wire Line |
| 4150 4350 3850 4350 |
| $Comp |
| L power:PWR_FLAG #FLG? |
| U 1 1 5D81782A |
| P 4150 4350 |
| F 0 "#FLG?" H 4150 4425 50 0001 C CNN |
| F 1 "PWR_FLAG" H 4150 4523 50 0000 C CNN |
| F 2 "" H 4150 4350 50 0001 C CNN |
| F 3 "~" H 4150 4350 50 0001 C CNN |
| 1 4150 4350 |
| 1 0 0 -1 |
| $EndComp |
| NoConn ~ 2200 3050 |
| NoConn ~ 2200 2950 |
| NoConn ~ 2700 2250 |
| NoConn ~ 3000 2550 |
| Wire Wire Line |
| 3850 3150 3850 4350 |
| Wire Wire Line |
| 2600 3850 2600 4350 |
| Wire Wire Line |
| 3850 4350 3850 4400 |
| Text Label 1450 4150 0 50 ~ 0 |
| HOLDOFF- |
| Connection ~ 3850 4350 |
| $Comp |
| L Device:R_US R1 |
| U 1 1 5D7B7C12 |
| P 950 2650 |
| F 0 "R1" H 1018 2696 50 0000 L CNN |
| F 1 "10K" H 1018 2605 50 0000 L CNN |
| F 2 "Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal" V 990 2640 50 0001 C CNN |
| F 3 "~" H 950 2650 50 0001 C CNN |
| 1 950 2650 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 4250 2850 3850 2850 |
| Connection ~ 2600 4350 |
| Wire Wire Line |
| 3850 4350 3500 4350 |
| Wire Wire Line |
| 4250 3150 3850 3150 |
| Wire Wire Line |
| 1450 4150 3250 4150 |
| Wire Wire Line |
| 1900 2650 2200 2650 |
| Wire Wire Line |
| 1900 2800 1900 2650 |
| Wire Wire Line |
| 1900 3200 1900 3350 |
| $Comp |
| L Device:R_US R2 |
| U 1 1 5D6E06BE |
| P 1450 2650 |
| F 0 "R2" H 1518 2696 50 0000 L CNN |
| F 1 "10K" H 1518 2605 50 0000 L CNN |
| F 2 "Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal" V 1490 2640 50 0001 C CNN |
| F 3 "~" H 1450 2650 50 0001 C CNN |
| 1 1450 2650 |
| 1 0 0 -1 |
| $EndComp |
| Text Notes 1200 5450 0 50 ~ 0 |
| WiFi Bathroom Scale\nRemove the electronics (LCD and control board) from an inexpensive\ndigital bathroom scale ($10 from CVS). Connect the load cells to an\nHX711 module and connect that to this circuit. The power can be\nsupplied either via the USB connector on the Wemos D1 Mini board\nand fed down the 4-conductor cable to the HX711, or in the other\ndirection, by attaching a power jack or USB connector at the HX711 end. |
| $Comp |
| L power:GND #PWR? |
| U 1 1 5D6FDF6B |
| P 3850 4400 |
| F 0 "#PWR?" H 3850 4150 50 0001 C CNN |
| F 1 "GND" H 3855 4227 50 0000 C CNN |
| F 2 "" H 3850 4400 50 0001 C CNN |
| F 3 "" H 3850 4400 50 0001 C CNN |
| 1 3850 4400 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 2500 2250 2500 1900 |
| $Comp |
| L Transistor_FET:2N7000 Q1 |
| U 1 1 5D719A49 |
| P 1800 3000 |
| F 0 "Q1" H 2000 3200 50 0000 L CNN |
| F 1 "2N7000" H 1950 2800 50 0000 L CNN |
| F 2 "Package_TO_SOT_THT:TO-92_Inline" H 2000 2925 50 0001 L CIN |
| F 3 "https://www.fairchildsemi.com/datasheets/2N/2N7000.pdf" H 1800 3000 50 0001 L CNN |
| 1 1800 3000 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 1450 2800 1450 3000 |
| Connection ~ 1450 3000 |
| Wire Wire Line |
| 1600 3000 1450 3000 |
| $Comp |
| L Switch:SW_Push SW1 |
| U 1 1 5D847FE3 |
| P 950 3650 |
| F 0 "SW1" V 904 3602 50 0000 R CNN |
| F 1 "SW_Push" V 995 3602 50 0000 R CNN |
| F 2 "" H 950 3850 50 0001 C CNN |
| F 3 "~" H 950 3850 50 0001 C CNN |
| 1 950 3650 |
| 0 -1 1 0 |
| $EndComp |
| Wire Wire Line |
| 1450 2500 1450 2150 |
| Wire Wire Line |
| 2700 2150 2700 2250 |
| Wire Wire Line |
| 3000 2650 3250 2650 |
| Wire Wire Line |
| 3250 2650 3250 4150 |
| Wire Wire Line |
| 1450 3000 1450 4150 |
| Wire Wire Line |
| 3100 4000 1900 4000 |
| Wire Wire Line |
| 1900 4000 1900 3350 |
| Wire Wire Line |
| 950 2150 950 2500 |
| Connection ~ 1450 2150 |
| Wire Wire Line |
| 950 2800 950 3350 |
| Connection ~ 1900 3350 |
| Connection ~ 950 3350 |
| Wire Wire Line |
| 950 3350 950 3450 |
| Wire Wire Line |
| 950 3850 950 4350 |
| Wire Wire Line |
| 950 4350 2600 4350 |
| Wire Wire Line |
| 2500 1900 3350 1900 |
| Wire Wire Line |
| 3000 3350 3100 3350 |
| Wire Wire Line |
| 3100 3350 3100 4000 |
| $Comp |
| L MCU_Module:WeMos_D1_mini U1 |
| U 1 1 5D6C71D5 |
| P 2600 3050 |
| F 0 "U1" H 2350 2300 50 0000 C CNN |
| F 1 "WeMos_D1_mini" H 2300 2200 50 0000 C CNN |
| F 2 "Module:WEMOS_D1_mini_light" H 2600 1900 50 0001 C CNN |
| F 3 "https://wiki.wemos.cc/products:d1:d1_mini#documentation" H 750 1900 50 0001 C CNN |
| 1 2600 3050 |
| 1 0 0 -1 |
| $EndComp |
| NoConn ~ 3000 3150 |
| NoConn ~ 3000 3250 |
| NoConn ~ 3000 3450 |
| $Comp |
| L Connector:Conn_01x04_Male J1 |
| U 1 1 5D86002D |
| P 4450 2950 |
| F 0 "J1" H 4400 3250 50 0000 L CNN |
| F 1 "MalePinsOnD1Mini" H 4300 3150 50 0000 L CNN |
| F 2 "" H 4450 2950 50 0001 C CNN |
| F 3 "~" H 4450 2950 50 0001 C CNN |
| 1 4450 2950 |
| -1 0 0 -1 |
| $EndComp |
| $Comp |
| L Device:CP1 C1 |
| U 1 1 5D866346 |
| P 3500 3700 |
| F 0 "C1" H 3615 3746 50 0000 L CNN |
| F 1 "47u" H 3615 3655 50 0000 L CNN |
| F 2 "" H 3500 3700 50 0001 C CNN |
| F 3 "~" H 3500 3700 50 0001 C CNN |
| 1 3500 3700 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 3500 3550 3500 1900 |
| Connection ~ 3500 1900 |
| Wire Wire Line |
| 3500 1900 3850 1900 |
| Wire Wire Line |
| 3500 3850 3500 4350 |
| Connection ~ 3500 4350 |
| Wire Wire Line |
| 1450 2150 950 2150 |
| Wire Wire Line |
| 1900 3350 950 3350 |
| Wire Wire Line |
| 1450 2150 2700 2150 |
| Wire Wire Line |
| 2600 4350 3500 4350 |
| Text Label 3550 2950 0 50 ~ 0 |
| HX711_DOUT |
| Text Label 3550 3050 0 50 ~ 0 |
| HX711_SCK |
| Wire Wire Line |
| 3000 2950 4250 2950 |
| Wire Wire Line |
| 3000 3050 4250 3050 |
| $Comp |
| L Connector:Conn_01x04_Female J2 |
| U 1 1 5D880BC7 |
| P 4700 2950 |
| F 0 "J2" H 4650 2650 50 0000 C CNN |
| F 1 "DupontFemale4" H 4400 2550 50 0000 C CNN |
| F 2 "" H 4700 2950 50 0001 C CNN |
| F 3 "~" H 4700 2950 50 0001 C CNN |
| 1 4700 2950 |
| -1 0 0 -1 |
| $EndComp |
| $Comp |
| L Connector:Conn_01x04_Female J3 |
| U 1 1 5D882182 |
| P 5600 2950 |
| F 0 "J3" H 5550 3300 50 0000 L CNN |
| F 1 "MolexKKFemale" H 5200 3200 50 0000 L CNN |
| F 2 "" H 5600 2950 50 0001 C CNN |
| F 3 "~" H 5600 2950 50 0001 C CNN |
| 1 5600 2950 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 4900 2850 5400 2850 |
| Wire Wire Line |
| 4900 3150 5400 3150 |
| Wire Wire Line |
| 4900 2950 5400 3050 |
| Wire Wire Line |
| 4900 3050 5400 2950 |
| $Comp |
| L Connector:USB_B_Micro J5 |
| U 1 1 5D88987B |
| P 7200 3900 |
| F 0 "J5" H 6970 3889 50 0000 R CNN |
| F 1 "USB_B_Micro" H 6970 3798 50 0000 R CNN |
| F 2 "" H 7350 3850 50 0001 C CNN |
| F 3 "~" H 7350 3850 50 0001 C CNN |
| 1 7200 3900 |
| -1 0 0 -1 |
| $EndComp |
| $Comp |
| L Connector:Conn_01x04_Male J4 |
| U 1 1 5D898CAD |
| P 5900 2950 |
| F 0 "J4" H 6050 2650 50 0000 L CNN |
| F 1 "MolexKKMale" H 5850 2550 50 0000 L CNN |
| F 2 "" H 5900 2950 50 0001 C CNN |
| F 3 "~" H 5900 2950 50 0001 C CNN |
| 1 5900 2950 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 6500 4400 6750 4400 |
| Wire Wire Line |
| 7200 4400 7200 4300 |
| $Comp |
| L Device:CP1 C? |
| U 1 1 5D8A0EC1 |
| P 6750 4000 |
| F 0 "C?" H 6865 4046 50 0000 L CNN |
| F 1 "47u" H 6865 3955 50 0000 L CNN |
| F 2 "" H 6750 4000 50 0001 C CNN |
| F 3 "~" H 6750 4000 50 0001 C CNN |
| 1 6750 4000 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 6750 3850 6750 3700 |
| Wire Wire Line |
| 6750 3700 6900 3700 |
| Wire Wire Line |
| 6750 4150 6750 4400 |
| Connection ~ 6750 4400 |
| Wire Wire Line |
| 6750 4400 7200 4400 |
| $Comp |
| L Connector:Conn_01x04_Female J4 |
| U 1 1 5D8A3280 |
| P 7000 2950 |
| F 0 "J4" H 6950 3300 50 0000 L CNN |
| F 1 "MolexKKFemale" H 6600 3200 50 0000 L CNN |
| F 2 "" H 7000 2950 50 0001 C CNN |
| F 3 "~" H 7000 2950 50 0001 C CNN |
| 1 7000 2950 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 6100 2850 6600 2850 |
| Wire Wire Line |
| 6100 2950 6800 2950 |
| Wire Wire Line |
| 6100 3050 6800 3050 |
| Wire Wire Line |
| 6600 2850 6600 3700 |
| Wire Wire Line |
| 6600 3700 6750 3700 |
| Connection ~ 6600 2850 |
| Wire Wire Line |
| 6600 2850 6800 2850 |
| Connection ~ 6750 3700 |
| Wire Wire Line |
| 6500 4400 6500 3150 |
| Wire Wire Line |
| 6100 3150 6500 3150 |
| Connection ~ 6500 3150 |
| Wire Wire Line |
| 6500 3150 6800 3150 |
| Text Notes 6250 2600 0 50 ~ 0 |
| Adapter board\ninside scale |
| Text Notes 4700 2500 0 50 ~ 0 |
| Cable to electronics box. |
| Text Notes 7550 2750 0 50 ~ 0 |
| HX711 Module |
| Wire Notes Line |
| 7400 2850 7150 2850 |
| Wire Notes Line |
| 7400 2950 7150 2950 |
| Wire Notes Line |
| 7400 3050 7150 3050 |
| Wire Notes Line |
| 7400 3150 7150 3150 |
| Wire Notes Line |
| 7400 2800 8200 2800 |
| Text Notes 7450 2900 0 50 ~ 0 |
| V+ |
| Text Notes 7450 3000 0 50 ~ 0 |
| DT |
| Text Notes 7450 3100 0 50 ~ 0 |
| SCK |
| Text Notes 7450 3200 0 50 ~ 0 |
| GND |
| Text Notes 8050 2900 0 50 ~ 0 |
| E+ |
| Text Notes 8050 3000 0 50 ~ 0 |
| E- |
| Text Notes 8050 3100 0 50 ~ 0 |
| A- |
| Text Notes 8050 3200 0 50 ~ 0 |
| A+ |
| $Comp |
| L Device:R_Variable_US LC2 |
| U 1 1 5D8C038E |
| P 8750 3250 |
| F 0 "LC2" H 8900 3450 50 0000 L CNN |
| F 1 "LCV" H 8878 3205 50 0001 L CNN |
| F 2 "" V 8680 3250 50 0001 C CNN |
| F 3 "~" H 8750 3250 50 0001 C CNN |
| 1 8750 3250 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L Device:R_US LCF2 |
| U 1 1 5D8C1BBB |
| P 8750 2850 |
| F 0 "LCF2" H 8818 2896 50 0001 L CNN |
| F 1 "LCF" H 8818 2850 50 0001 L CNN |
| F 2 "" V 8790 2840 50 0001 C CNN |
| F 3 "~" H 8750 2850 50 0001 C CNN |
| 1 8750 2850 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L Device:R_US LCF3 |
| U 1 1 5D8C62D1 |
| P 9150 2400 |
| F 0 "LCF3" H 9218 2446 50 0001 L CNN |
| F 1 "LCF" V 9263 2400 50 0001 C CNN |
| F 2 "" V 9190 2390 50 0001 C CNN |
| F 3 "~" H 9150 2400 50 0001 C CNN |
| 1 9150 2400 |
| 0 -1 -1 0 |
| $EndComp |
| $Comp |
| L Device:R_US LCF1 |
| U 1 1 5D8C6911 |
| P 9550 3650 |
| F 0 "LCF1" V 9800 3600 50 0001 L CNN |
| F 1 "LCF" V 9700 3550 50 0001 L CNN |
| F 2 "" V 9590 3640 50 0001 C CNN |
| F 3 "~" H 9550 3650 50 0001 C CNN |
| 1 9550 3650 |
| 0 -1 -1 0 |
| $EndComp |
| $Comp |
| L Device:R_US LCF4 |
| U 1 1 5D8C6DB3 |
| P 9950 3250 |
| F 0 "LCF4" H 10018 3296 50 0001 L CNN |
| F 1 "LCF" H 10018 3250 50 0001 L CNN |
| F 2 "" V 9990 3240 50 0001 C CNN |
| F 3 "~" H 9950 3250 50 0001 C CNN |
| 1 9950 3250 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L Device:R_Variable_US LC3 |
| U 1 1 5D8C71D8 |
| P 9550 2400 |
| F 0 "LC3" V 9350 2550 50 0000 L CNN |
| F 1 "LCV" H 9678 2355 50 0001 L CNN |
| F 2 "" V 9480 2400 50 0001 C CNN |
| F 3 "~" H 9550 2400 50 0001 C CNN |
| 1 9550 2400 |
| 0 -1 -1 0 |
| $EndComp |
| $Comp |
| L Device:R_Variable_US LC1 |
| U 1 1 5D8C75AC |
| P 9150 3650 |
| F 0 "LC1" V 9350 3450 50 0000 C CNN |
| F 1 "SGV" V 9324 3650 50 0001 C CNN |
| F 2 "" V 9080 3650 50 0001 C CNN |
| F 3 "~" H 9150 3650 50 0001 C CNN |
| 1 9150 3650 |
| 0 -1 -1 0 |
| $EndComp |
| $Comp |
| L Device:R_Variable_US LC4 |
| U 1 1 5D8C78C7 |
| P 9950 2850 |
| F 0 "LC4" H 9650 2650 50 0000 L CNN |
| F 1 "LCV" H 10078 2805 50 0001 L CNN |
| F 2 "" V 9880 2850 50 0001 C CNN |
| F 3 "~" H 9950 2850 50 0001 C CNN |
| 1 9950 2850 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 8350 2850 8200 2850 |
| Wire Wire Line |
| 9350 3900 8350 3900 |
| Wire Wire Line |
| 8350 3900 8350 2950 |
| Wire Wire Line |
| 8350 2950 8200 2950 |
| Wire Wire Line |
| 8250 3150 8200 3150 |
| Wire Wire Line |
| 8200 3050 8750 3050 |
| Wire Wire Line |
| 9300 2400 9350 2400 |
| Wire Wire Line |
| 9950 3000 9950 3050 |
| Wire Wire Line |
| 9300 3650 9350 3650 |
| Wire Wire Line |
| 8750 3000 8750 3050 |
| Wire Wire Line |
| 9700 2400 9950 2400 |
| Wire Wire Line |
| 9950 2400 9950 2700 |
| Wire Wire Line |
| 9000 2400 8750 2400 |
| Wire Wire Line |
| 8750 2400 8750 2700 |
| Wire Wire Line |
| 8750 3400 8750 3650 |
| Wire Wire Line |
| 8750 3650 9000 3650 |
| Wire Wire Line |
| 9950 3400 9950 3650 |
| Wire Wire Line |
| 9950 3650 9700 3650 |
| Wire Wire Line |
| 9350 3650 9350 3900 |
| Connection ~ 9350 3650 |
| Wire Wire Line |
| 9350 3650 9400 3650 |
| Wire Wire Line |
| 8350 2850 8350 2150 |
| Wire Wire Line |
| 8350 2150 9350 2150 |
| Connection ~ 9350 2400 |
| Wire Wire Line |
| 9350 2400 9400 2400 |
| Connection ~ 8750 3050 |
| Wire Wire Line |
| 8750 3050 8750 3100 |
| Wire Wire Line |
| 8250 4050 10350 4050 |
| Wire Wire Line |
| 10350 4050 10350 3050 |
| Wire Wire Line |
| 10350 3050 9950 3050 |
| Wire Wire Line |
| 8250 3150 8250 4050 |
| Connection ~ 9950 3050 |
| Wire Wire Line |
| 9950 3050 9950 3100 |
| Wire Notes Line |
| 10100 2700 10100 3450 |
| Wire Notes Line |
| 9000 2250 9750 2250 |
| Wire Notes Line |
| 8900 2700 8900 3400 |
| Wire Notes Line |
| 8900 3400 8600 3400 |
| Wire Notes Line |
| 8600 3400 8600 2700 |
| Wire Notes Line |
| 8600 2700 8900 2700 |
| Wire Notes Line |
| 9000 3500 9700 3500 |
| Wire Notes Line |
| 9700 3500 9700 3800 |
| Wire Notes Line |
| 9700 3800 9000 3800 |
| Wire Notes Line |
| 9000 3800 9000 3500 |
| Wire Notes Line |
| 10100 2700 9800 2700 |
| Wire Notes Line |
| 9800 2700 9800 3450 |
| Wire Notes Line |
| 9800 3450 10100 3450 |
| Wire Notes Line |
| 9000 2550 9750 2550 |
| Wire Notes Line |
| 9750 2250 9750 2550 |
| Wire Notes Line |
| 9000 2250 9000 2550 |
| Wire Wire Line |
| 9350 2150 9350 2400 |
| Text Notes 9050 2900 0 50 ~ 0 |
| Bathroom Scale\n Load Cells\n |
| Wire Notes Line |
| 7400 3250 8200 3250 |
| Wire Notes Line |
| 7400 2800 7400 3250 |
| Wire Notes Line |
| 8200 2800 8200 3250 |
| Wire Wire Line |
| 3000 2750 3050 2750 |
| Wire Wire Line |
| 3050 2750 3050 1700 |
| Wire Wire Line |
| 3000 2850 3150 2850 |
| Wire Wire Line |
| 3150 2850 3150 1700 |
| Text GLabel 3050 1700 1 50 Input ~ 0 |
| OLED_SCL |
| Text GLabel 3150 1700 1 50 Input ~ 0 |
| OLED_SDA |
| Wire Wire Line |
| 3350 1900 3350 1700 |
| Connection ~ 3350 1900 |
| Wire Wire Line |
| 3350 1900 3500 1900 |
| Wire Wire Line |
| 950 4350 600 4350 |
| Wire Wire Line |
| 600 4350 600 1800 |
| Wire Wire Line |
| 600 1800 2850 1800 |
| Wire Wire Line |
| 2850 1800 2850 1700 |
| Connection ~ 950 4350 |
| Text GLabel 3350 1700 1 50 Input ~ 0 |
| OLED_VCC |
| Text GLabel 2850 1700 1 50 Input ~ 0 |
| OLED_GND |
| Wire Notes Line |
| 2450 850 2450 1750 |
| Wire Notes Line |
| 2450 1750 3700 1750 |
| Wire Notes Line |
| 3700 1750 3700 850 |
| Wire Notes Line |
| 3700 850 2450 850 |
| Text Notes 2700 1100 0 50 ~ 0 |
| Wemos OLED Shield\nPiggybacked on D1 Mini |
| $EndSCHEMATC |
