updated pcb, switched imus

electrical/ARC-Boat0/ARC-Boat0-cache.lib

@@ -83,37 +83,6 @@ X Pin_6 6 300 -100 150 L 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
-# Connector_Generic_Conn_02x04_Odd_Even
-#
-DEF Connector_Generic_Conn_02x04_Odd_Even J 0 40 Y N 1 F N
-F0 "J" 50 200 50 H V C CNN
-F1 "Connector_Generic_Conn_02x04_Odd_Even" 50 -300 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- Connector*:*_2x??_*
-$ENDFPLIST
-DRAW
-S -50 -195 0 -205 1 1 6 N
-S -50 -95 0 -105 1 1 6 N
-S -50 5 0 -5 1 1 6 N
-S -50 105 0 95 1 1 6 N
-S -50 150 150 -250 1 1 10 f
-S 150 -195 100 -205 1 1 6 N
-S 150 -95 100 -105 1 1 6 N
-S 150 5 100 -5 1 1 6 N
-S 150 105 100 95 1 1 6 N
-X Pin_1 1 -200 100 150 R 50 50 1 1 P
-X Pin_2 2 300 100 150 L 50 50 1 1 P
-X Pin_3 3 -200 0 150 R 50 50 1 1 P
-X Pin_4 4 300 0 150 L 50 50 1 1 P
-X Pin_5 5 -200 -100 150 R 50 50 1 1 P
-X Pin_6 6 300 -100 150 L 50 50 1 1 P
-X Pin_7 7 -200 -200 150 R 50 50 1 1 P
-X Pin_8 8 300 -200 150 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
 # Device_CP1_Small
 #
 DEF Device_CP1_Small C 0 10 N N 1 F N
@@ -503,6 +472,45 @@ X BOOT 6 400 0 100 L 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# Sensor_Motion_ICM-20948
+#
+DEF Sensor_Motion_ICM-20948 U 0 20 Y Y 1 F N
+F0 "U" -450 650 50 H V C CNN
+F1 "Sensor_Motion_ICM-20948" 300 -650 50 H V C CNN
+F2 "Sensor_Motion:InvenSense_QFN-24_3x3mm_P0.4mm" 0 -1000 50 H I C CNN
+F3 "" 0 -150 50 H I C CNN
+$FPLIST
+ InvenSense?QFN*3x3mm*P0.4mm*
+$ENDFPLIST
+DRAW
+S -400 600 400 -600 0 1 10 f
+X NC 1 -400 500 100 R 50 50 1 1 N N
+X REGOUT 10 500 -200 100 L 50 50 1 1 P
+X FSYNC 11 -500 -200 100 R 50 50 1 1 I
+X INT1 12 -500 -300 100 R 50 50 1 1 O
+X VDD 13 100 700 100 D 50 50 1 1 W
+X NC 14 400 300 100 L 50 50 1 1 N N
+X NC 15 400 200 100 L 50 50 1 1 N N
+X NC 16 400 -300 100 L 50 50 1 1 N N
+X NC 17 400 -400 100 L 50 50 1 1 N N
+X GND 18 0 -700 100 U 50 50 1 1 W
+X RESV 19 400 -500 100 L 50 50 1 1 N N
+X NC 2 -400 400 100 R 50 50 1 1 N N
+X GND 20 0 -700 100 U 50 50 1 1 P N
+X AUX_DA 21 500 100 100 L 50 50 1 1 B
+X ~CS 22 -500 0 100 R 50 50 1 1 I
+X SCL/SCLK 23 -500 100 100 R 50 50 1 1 I
+X SDA/SDI 24 -500 200 100 R 50 50 1 1 B
+X NC 3 -400 -100 100 R 50 50 1 1 N N
+X NC 4 -400 -400 100 R 50 50 1 1 N N
+X NC 5 -400 -500 100 R 50 50 1 1 N N
+X NC 6 400 400 100 L 50 50 1 1 N N
+X AUX_CL 7 500 0 100 L 50 50 1 1 O
+X VDDIO 8 -100 700 100 D 50 50 1 1 W
+X SDO/AD0 9 -500 300 100 R 50 50 1 1 B
+ENDDRAW
+ENDDEF
+#
 # Switch_SW_Push
 #
 DEF Switch_SW_Push SW 0 40 N N 1 F N

electrical/ARC-Boat0/ARC-Boat0.pro

@@ -1,4 +1,4 @@
-update=Fri 11 Dec 2020 05:48:02 PM CST
+update=Wed 03 Mar 2021 04:43:25 PM CST
 version=1
 last_client=kicad
 [general]
@@ -239,7 +239,7 @@ Enabled=0
 [pcbnew/Netclasses]
 [pcbnew/Netclasses/Default]
 Name=Default
-Clearance=0.2032
+Clearance=0.201
 TrackWidth=0.25
 ViaDiameter=0.8
 ViaDrill=0.4
@@ -250,7 +250,7 @@ dPairGap=0.25
 dPairViaGap=0.25
 [pcbnew/Netclasses/1]
 Name=POWER
-Clearance=0.2032
+Clearance=0.201
 TrackWidth=0.4
 ViaDiameter=0.8
 ViaDrill=0.4

electrical/ARC-Boat0/Brain.sch

@@ -1065,8 +1065,4 @@ F 3 "http://infocenter.arm.com/help/topic/com.arm.doc.ddi0314h/DDI0314H_coresigh
 	1    9700 4525
 	1    0    0    -1  
 $EndComp
-Wire Wire Line
-	6900 2050 8500 2050
-Wire Wire Line
-	8500 2050 8500 2600
 $EndSCHEMATC

electrical/ARC-Boat0/Controls.sch

@@ -65,26 +65,14 @@ Text HLabel 1100 1950 0    50   Input ~ 0
 GPS_EXT_INT
 Text HLabel 1100 2100 0    50   Input ~ 0
 IMU_EXT_INT1
-Text HLabel 1100 2250 0    50   Input ~ 0
-IMU_EXT_INT2
-Text HLabel 1100 2400 0    50   Input ~ 0
-MAG_EXT_INT
 Text Label 1500 1950 0    50   ~ 0
 GPS_EXT_INT
 Wire Wire Line
 	1100 1950 1500 1950
 Wire Wire Line
 	1100 2100 1500 2100
-Wire Wire Line
-	1100 2250 1500 2250
-Wire Wire Line
-	1100 2400 1500 2400
 Text Label 1500 2100 0    50   ~ 0
 IMU_EXT_INT1
-Text Label 1500 2250 0    50   ~ 0
-IMU_EXT_INT2
-Text Label 1500 2400 0    50   ~ 0
-MAG_EXT_INT
 Wire Wire Line
 	3400 3300 3250 3300
 Wire Wire Line
@@ -239,12 +227,6 @@ Wire Wire Line
 	1850 3600 1850 3425
 Text Label 1850 3425 0    50   ~ 0
 Vcc
-Text Label 1525 3025 0    50   ~ 0
-MAG_DRDY
-Text HLabel 1125 3025 0    50   Input ~ 0
-MAG_DRDY
-Wire Wire Line
-	1525 3025 1125 3025
 $Comp
 L Connector_Generic:Conn_02x03_Odd_Even J1
 U 1 1 5FE29883
@@ -291,58 +273,161 @@ Wire Wire Line
 Wire Wire Line
 	6300 2650 6450 2650
 NoConn ~ 5800 2650
+$Comp
+L Sensor_Motion:ICM-20948 U3
+U 1 1 604E43AD
+P 3650 5475
+F 0 "U3" H 3275 4725 50  0000 C CNN
+F 1 "ICM-20948" H 3325 4800 50  0000 C CNN
+F 2 "Sensor_Motion:InvenSense_QFN-24_3x3mm_P0.4mm" H 3650 4475 50  0001 C CNN
+F 3 "http://www.invensense.com/wp-content/uploads/2016/06/DS-000189-ICM-20948-v1.3.pdf" H 3650 5325 50  0001 C CNN
+	1    3650 5475
+	1    0    0    -1  
+$EndComp
+NoConn ~ 4150 5375
+NoConn ~ 4150 5475
 Wire Wire Line
-	5050 4650 4750 4650
+	3150 5675 2875 5675
-Text Label 4750 4650 2    50   ~ 0
-Vcc
-Text Label 4750 4750 2    50   ~ 0
-I2C_SCL
 Wire Wire Line
-	4750 4750 5050 4750
+	2875 5675 2875 5825
-Text Label 5900 4750 0    50   ~ 0
+$Comp
-I2C_SDA
+L power:GND #PWR0101
+U 1 1 604E9663
+P 2875 5825
+F 0 "#PWR0101" H 2875 5575 50  0001 C CNN
+F 1 "GND" H 2880 5652 50  0000 C CNN
+F 2 "" H 2875 5825 50  0001 C CNN
+F 3 "" H 2875 5825 50  0001 C CNN
+	1    2875 5825
+	1    0    0    -1  
+$EndComp
 Wire Wire Line
-	5900 4750 5550 4750
+	3650 6175 3650 6325
+$Comp
+L power:GND #PWR0102
+U 1 1 604EAD7D
+P 3650 6325
+F 0 "#PWR0102" H 3650 6075 50  0001 C CNN
+F 1 "GND" H 3655 6152 50  0000 C CNN
+F 2 "" H 3650 6325 50  0001 C CNN
+F 3 "" H 3650 6325 50  0001 C CNN
+	1    3650 6325
+	1    0    0    -1  
+$EndComp
 Wire Wire Line
-	6525 4650 6525 4850
+	3550 4775 3550 4475
+Wire Wire Line
+	3750 4775 3750 4525
+Wire Wire Line
+	3750 4525 4300 4525
 $Comp
-L power:GND #PWR0101
+L Device:C_Small C33
-U 1 1 607FC572
+U 1 1 604ED59D
-P 6525 4850
+P 4300 4625
-F 0 "#PWR0101" H 6525 4600 50  0001 C CNN
+F 0 "C33" H 4392 4671 50  0000 L CNN
-F 1 "GND" H 6530 4677 50  0000 C CNN
+F 1 "0.1uF" H 4392 4580 50  0000 L CNN
-F 2 "" H 6525 4850 50  0001 C CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric" H 4300 4625 50  0001 C CNN
-F 3 "" H 6525 4850 50  0001 C CNN
+F 3 "~" H 4300 4625 50  0001 C CNN
-	1    6525 4850
+	1    4300 4625
 	1    0    0    -1  
 $EndComp
-Text Label 4750 4850 2    50   ~ 0
+$Comp
-IMU_EXT_INT1
+L Device:C_Small C35
+U 1 1 604EFA39
+P 4700 4625
+F 0 "C35" H 4792 4671 50  0000 L CNN
+F 1 "0.1uF" H 4792 4580 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric" H 4700 4625 50  0001 C CNN
+F 3 "~" H 4700 4625 50  0001 C CNN
+	1    4700 4625
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4700 4475 4700 4525
+Wire Wire Line
+	3550 4475 4375 4475
 Wire Wire Line
-	4750 4850 5050 4850
+	4300 4725 4300 4775
-Text Label 5725 4850 0    50   ~ 0
-IMU_EXT_INT2
 Wire Wire Line
-	5725 4850 5550 4850
+	4300 4775 4500 4775
-Text Label 4750 4950 2    50   ~ 0
-MAG_DRDY
 Wire Wire Line
-	4750 4950 5050 4950
+	4700 4775 4700 4725
 Wire Wire Line
-	5750 4950 5550 4950
+	4500 4775 4500 4850
+Connection ~ 4500 4775
+Wire Wire Line
+	4500 4775 4700 4775
 $Comp
-L Connector_Generic:Conn_02x04_Odd_Even J5
+L power:GND #PWR0103
-U 1 1 60810F35
+U 1 1 604F3DC7
-P 5250 4750
+P 4500 4850
-F 0 "J5" H 5300 5067 50  0000 C CNN
+F 0 "#PWR0103" H 4500 4600 50  0001 C CNN
-F 1 "Conn_02x04_Odd_Even" H 5300 4976 50  0000 C CNN
+F 1 "GND" H 4505 4677 50  0000 C CNN
-F 2 "Connector_PinHeader_1.27mm:PinHeader_2x04_P1.27mm_Vertical_SMD" H 5250 4750 50  0001 C CNN
+F 2 "" H 4500 4850 50  0001 C CNN
-F 3 "~" H 5250 4750 50  0001 C CNN
+F 3 "" H 4500 4850 50  0001 C CNN
-	1    5250 4750
+	1    4500 4850
 	1    0    0    -1  
 $EndComp
-Text Label 5750 4950 0    50   ~ 0
-MAG_EXT_INT
 Wire Wire Line
-	5550 4650 6525 4650
+	4150 5675 4500 5675
+$Comp
+L Device:C_Small C34
+U 1 1 604F4D35
+P 4500 5775
+F 0 "C34" H 4592 5821 50  0000 L CNN
+F 1 "0.1uF" H 4592 5730 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric" H 4500 5775 50  0001 C CNN
+F 3 "~" H 4500 5775 50  0001 C CNN
+	1    4500 5775
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4500 5875 4500 5950
+$Comp
+L power:GND #PWR0104
+U 1 1 604F6D2E
+P 4500 5950
+F 0 "#PWR0104" H 4500 5700 50  0001 C CNN
+F 1 "GND" H 4505 5777 50  0000 C CNN
+F 2 "" H 4500 5950 50  0001 C CNN
+F 3 "" H 4500 5950 50  0001 C CNN
+	1    4500 5950
+	1    0    0    -1  
+$EndComp
+Text Label 4375 4275 0    50   ~ 0
+Vcc
+Wire Wire Line
+	4375 4275 4375 4475
+Connection ~ 4375 4475
+Wire Wire Line
+	4375 4475 4700 4475
+Text Label 2400 5450 0    50   ~ 0
+Vcc
+Wire Wire Line
+	2400 5475 2400 5450
+Wire Wire Line
+	2400 5475 2550 5475
+Text Label 3025 5375 2    50   ~ 0
+I2C_SCL
+Wire Wire Line
+	3025 5375 3150 5375
+Text Label 3000 5275 2    50   ~ 0
+I2C_SDA
+Wire Wire Line
+	3000 5275 3150 5275
+Wire Wire Line
+	3150 5175 2550 5175
+Wire Wire Line
+	2550 5175 2550 5475
+Connection ~ 2550 5475
+Wire Wire Line
+	2550 5475 3150 5475
+Text Label 2900 6250 2    50   ~ 0
+IMU_EXT_INT1
+Wire Wire Line
+	2900 6250 3025 6250
+Wire Wire Line
+	3025 6250 3025 5775
+Wire Wire Line
+	3025 5775 3150 5775
 $EndSCHEMATC

electrical/ARC-Boat0/Controls.sch-bak

@@ -65,26 +65,14 @@ Text HLabel 1100 1950 0    50   Input ~ 0
 GPS_EXT_INT
 Text HLabel 1100 2100 0    50   Input ~ 0
 IMU_EXT_INT1
-Text HLabel 1100 2250 0    50   Input ~ 0
-IMU_EXT_INT2
-Text HLabel 1100 2400 0    50   Input ~ 0
-MAG_EXT_INT
 Text Label 1500 1950 0    50   ~ 0
 GPS_EXT_INT
 Wire Wire Line
 	1100 1950 1500 1950
 Wire Wire Line
 	1100 2100 1500 2100
-Wire Wire Line
-	1100 2250 1500 2250
-Wire Wire Line
-	1100 2400 1500 2400
 Text Label 1500 2100 0    50   ~ 0
 IMU_EXT_INT1
-Text Label 1500 2250 0    50   ~ 0
-IMU_EXT_INT2
-Text Label 1500 2400 0    50   ~ 0
-MAG_EXT_INT
 Wire Wire Line
 	3400 3300 3250 3300
 Wire Wire Line
@@ -239,12 +227,6 @@ Wire Wire Line
 	1850 3600 1850 3425
 Text Label 1850 3425 0    50   ~ 0
 Vcc
-Text Label 1525 3025 0    50   ~ 0
-MAG_DRDY
-Text HLabel 1125 3025 0    50   Input ~ 0
-MAG_DRDY
-Wire Wire Line
-	1525 3025 1125 3025
 $Comp
 L Connector_Generic:Conn_02x03_Odd_Even J1
 U 1 1 5FE29883
@@ -291,58 +273,161 @@ Wire Wire Line
 Wire Wire Line
 	6300 2650 6450 2650
 NoConn ~ 5800 2650
+$Comp
+L Sensor_Motion:ICM-20948 U3
+U 1 1 604E43AD
+P 3650 5475
+F 0 "U3" H 3275 4725 50  0000 C CNN
+F 1 "ICM-20948" H 3325 4800 50  0000 C CNN
+F 2 "Sensor_Motion:InvenSense_QFN-24_3x3mm_P0.4mm" H 3650 4475 50  0001 C CNN
+F 3 "http://www.invensense.com/wp-content/uploads/2016/06/DS-000189-ICM-20948-v1.3.pdf" H 3650 5325 50  0001 C CNN
+	1    3650 5475
+	1    0    0    -1  
+$EndComp
+NoConn ~ 4150 5375
+NoConn ~ 4150 5475
 Wire Wire Line
-	5050 4650 4750 4650
+	3150 5675 2875 5675
-Text Label 4750 4650 2    50   ~ 0
-Vcc
-Text Label 4750 4750 2    50   ~ 0
-I2C_SCL
 Wire Wire Line
-	4750 4750 5050 4750
+	2875 5675 2875 5825
-Text Label 5900 4750 0    50   ~ 0
+$Comp
-I2C_SDA
+L power:GND #PWR?
+U 1 1 604E9663
+P 2875 5825
+F 0 "#PWR?" H 2875 5575 50  0001 C CNN
+F 1 "GND" H 2880 5652 50  0000 C CNN
+F 2 "" H 2875 5825 50  0001 C CNN
+F 3 "" H 2875 5825 50  0001 C CNN
+	1    2875 5825
+	1    0    0    -1  
+$EndComp
 Wire Wire Line
-	5900 4750 5550 4750
+	3650 6175 3650 6325
+$Comp
+L power:GND #PWR?
+U 1 1 604EAD7D
+P 3650 6325
+F 0 "#PWR?" H 3650 6075 50  0001 C CNN
+F 1 "GND" H 3655 6152 50  0000 C CNN
+F 2 "" H 3650 6325 50  0001 C CNN
+F 3 "" H 3650 6325 50  0001 C CNN
+	1    3650 6325
+	1    0    0    -1  
+$EndComp
 Wire Wire Line
-	6525 4650 6525 4850
+	3550 4775 3550 4475
+Wire Wire Line
+	3750 4775 3750 4525
+Wire Wire Line
+	3750 4525 4300 4525
 $Comp
-L power:GND #PWR0101
+L Device:C_Small C?
-U 1 1 607FC572
+U 1 1 604ED59D
-P 6525 4850
+P 4300 4625
-F 0 "#PWR0101" H 6525 4600 50  0001 C CNN
+F 0 "C?" H 4392 4671 50  0000 L CNN
-F 1 "GND" H 6530 4677 50  0000 C CNN
+F 1 "0.1uF" H 4392 4580 50  0000 L CNN
-F 2 "" H 6525 4850 50  0001 C CNN
+F 2 "" H 4300 4625 50  0001 C CNN
-F 3 "" H 6525 4850 50  0001 C CNN
+F 3 "~" H 4300 4625 50  0001 C CNN
-	1    6525 4850
+	1    4300 4625
 	1    0    0    -1  
 $EndComp
-Text Label 4750 4850 2    50   ~ 0
+$Comp
-IMU_EXT_INT1
+L Device:C_Small C?
+U 1 1 604EFA39
+P 4700 4625
+F 0 "C?" H 4792 4671 50  0000 L CNN
+F 1 "0.1uF" H 4792 4580 50  0000 L CNN
+F 2 "" H 4700 4625 50  0001 C CNN
+F 3 "~" H 4700 4625 50  0001 C CNN
+	1    4700 4625
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4700 4475 4700 4525
+Wire Wire Line
+	3550 4475 4375 4475
+Wire Wire Line
+	4300 4725 4300 4775
 Wire Wire Line
-	4750 4850 5050 4850
+	4300 4775 4500 4775
-Text Label 5725 4850 0    50   ~ 0
-IMU_EXT_INT2
 Wire Wire Line
-	5725 4850 5550 4850
+	4700 4775 4700 4725
-Text Label 4750 4950 2    50   ~ 0
-MAG_DRDY
 Wire Wire Line
-	4750 4950 5050 4950
+	4500 4775 4500 4850
+Connection ~ 4500 4775
 Wire Wire Line
-	5750 4950 5550 4950
+	4500 4775 4700 4775
 $Comp
-L Connector_Generic:Conn_02x04_Odd_Even J5
+L power:GND #PWR?
-U 1 1 60810F35
+U 1 1 604F3DC7
-P 5250 4750
+P 4500 4850
-F 0 "J5" H 5300 5067 50  0000 C CNN
+F 0 "#PWR?" H 4500 4600 50  0001 C CNN
-F 1 "Conn_02x04_Odd_Even" H 5300 4976 50  0000 C CNN
+F 1 "GND" H 4505 4677 50  0000 C CNN
-F 2 "Connector_PinHeader_1.27mm:PinHeader_2x04_P1.27mm_Vertical_SMD" H 5250 4750 50  0001 C CNN
+F 2 "" H 4500 4850 50  0001 C CNN
-F 3 "~" H 5250 4750 50  0001 C CNN
+F 3 "" H 4500 4850 50  0001 C CNN
-	1    5250 4750
+	1    4500 4850
 	1    0    0    -1  
 $EndComp
-Text Label 5750 4950 0    50   ~ 0
-MAG_EXT_INT
 Wire Wire Line
-	5550 4650 6525 4650
+	4150 5675 4500 5675
+$Comp
+L Device:C_Small C?
+U 1 1 604F4D35
+P 4500 5775
+F 0 "C?" H 4592 5821 50  0000 L CNN
+F 1 "0.1uF" H 4592 5730 50  0000 L CNN
+F 2 "" H 4500 5775 50  0001 C CNN
+F 3 "~" H 4500 5775 50  0001 C CNN
+	1    4500 5775
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4500 5875 4500 5950
+$Comp
+L power:GND #PWR?
+U 1 1 604F6D2E
+P 4500 5950
+F 0 "#PWR?" H 4500 5700 50  0001 C CNN
+F 1 "GND" H 4505 5777 50  0000 C CNN
+F 2 "" H 4500 5950 50  0001 C CNN
+F 3 "" H 4500 5950 50  0001 C CNN
+	1    4500 5950
+	1    0    0    -1  
+$EndComp
+Text Label 4375 4275 0    50   ~ 0
+Vcc
+Wire Wire Line
+	4375 4275 4375 4475
+Connection ~ 4375 4475
+Wire Wire Line
+	4375 4475 4700 4475
+Text Label 2400 5450 0    50   ~ 0
+Vcc
+Wire Wire Line
+	2400 5475 2400 5450
+Wire Wire Line
+	2400 5475 2550 5475
+Text Label 3025 5375 2    50   ~ 0
+I2C_SCL
+Wire Wire Line
+	3025 5375 3150 5375
+Text Label 3000 5275 2    50   ~ 0
+I2C_SDA
+Wire Wire Line
+	3000 5275 3150 5275
+Wire Wire Line
+	3150 5175 2550 5175
+Wire Wire Line
+	2550 5175 2550 5475
+Connection ~ 2550 5475
+Wire Wire Line
+	2550 5475 3150 5475
+Text Label 2900 6250 2    50   ~ 0
+IMU_EXT_INT1
+Wire Wire Line
+	2900 6250 3025 6250
+Wire Wire Line
+	3025 6250 3025 5775
+Wire Wire Line
+	3025 5775 3150 5775
 $EndSCHEMATC

electrical/ARC-Boat0/fp-info-cache

@@ -1,4 +1,4 @@
-19807074123995003
+19904030869475003
 Battery
 BatteryHolder_Bulgin_BX0036_1xC
 Bulgin Battery Holder, BX0036, Battery Type C (https://www.bulgin.com/products/pub/media/bulgin/data/Battery_holders.pdf)