diff --git a/lib/custom.lib b/lib/custom.lib
index 5524a76..3d2bdd5 100644
--- a/lib/custom.lib
+++ b/lib/custom.lib
@@ -57,7 +57,7 @@ X ADC_8/A7 8 -1950 -250 200 R 50 50 1 1 I
 X ADC_7/A6 9 -1950 -150 200 R 50 50 1 1 I
 X ADC_6/A5 10 -1950 -50 200 R 50 50 1 1 I
 X +5V 20 1950 850 200 L 50 50 1 1 w
-X A11 30 1950 -150 200 L 50 50 1 1 I
+X PWM1_4/CAN1_RD/USB_DM/PA11 30 1950 -150 200 L 50 50 1 1 I
 X ADC_5/A4 11 -1950 50 200 R 50 50 1 1 I
 X B9 21 1950 750 200 L 50 50 1 1 I
 X PWM1_3/Serial1_RX/D2/PA10 31 1950 -250 200 L 50 50 1 1 I
@@ -80,7 +80,7 @@ X C14 17 -1950 650 200 R 50 50 1 1 I
 X B3 27 1950 150 200 L 50 50 1 1 I
 X B12 37 1950 -850 200 L 50 50 1 1 I
 X C13 18 -1950 750 200 R 50 50 1 1 I
-X A15 28 1950 50 200 L 50 50 1 1 I
+X PWM2_1/SPI1_NSS/A15 28 1950 50 200 L 50 50 1 1 I
 X VBAT 19 -1950 850 200 R 50 50 1 1 I
 X A12 29 1950 -50 200 L 50 50 1 1 I
 ENDDRAW
diff --git a/scripts/voltage_divider.py b/scripts/voltage_divider.py
new file mode 100755
index 0000000..d5ac317
--- /dev/null
+++ b/scripts/voltage_divider.py
@@ -0,0 +1,104 @@
+#!/usr/bin/env python
+# coding: utf8
+
+NOMINALS = [
+    1000000.0,
+    750000.0,
+    470000.0,
+    220000.0,
+    75000.0,
+    47000.0,
+    22000.0,
+    10000.0,
+    6800.0,
+    2200.0,
+    1000.0,
+    750.0,
+    470.0,
+    220.0,
+    100.0,
+    47.0,
+    22.0,
+    10.0
+]
+
+
+def format_value(value, suffix=''):
+    order_suffix = ''
+    divider = 1.0
+
+    orders = [
+        [1000000000.0, 'G'],
+        [1000000.0, 'M'],
+        [1000.0, 'k'],
+        [1.0, ''],
+        [0.001, 'm'],
+        [0.000001, u'\u00b5'],
+        [0.000000001, u'n'],
+        [0.000000000001, u'p'],
+    ]
+
+    for suggested_divider, suggested_order_suffix in orders:
+        if value >= suggested_divider:
+            divider = suggested_divider
+            order_suffix = suggested_order_suffix
+            break
+
+    mag_value = value / divider
+    mag_value = int(mag_value * 1000)
+    mod = mag_value % 1000
+    if mod == 0:
+        return "%i%s%s" % (mag_value / 1000.0, order_suffix, suffix)
+    elif mod % 100 == 0:
+        return "%.1f%s%s" % (mag_value / 1000.0, order_suffix, suffix)
+    elif mod % 10 == 0:
+        return "%.2f%s%s" % (mag_value / 1000.0, order_suffix, suffix)
+    return "%.3f%s%s" % (mag_value / 1000.0, order_suffix, suffix)
+
+def choose_resistors(v_in, v_out, limits='both'):
+    if v_in <= v_out:
+        raise Exception("Vin should be greater than Vout")
+    v_in = float(v_in)
+    v_out = float(v_out)
+    best_r1 = None
+    best_r2 = None
+    best_v_out = None
+
+    for r1 in NOMINALS:
+        for r2 in NOMINALS:
+            tmp_v_out = float(v_in * r2) / (r1 + r2)
+            choose_this_pair = best_v_out is None
+
+            if limits == 'both':
+                choose_this_pair = choose_this_pair or abs(tmp_v_out - v_out) < abs(best_v_out - v_out)
+            elif limits == 'upper':
+                choose_this_pair = choose_this_pair or v_out <= tmp_v_out < best_v_out or best_v_out < v_out
+            elif limits == 'lower':
+                choose_this_pair = choose_this_pair or best_v_out < tmp_v_out <= v_out or best_v_out > v_out
+
+            if choose_this_pair:
+                best_r1 = r1
+                best_r2 = r2
+                best_v_out = tmp_v_out
+
+    print u"R1 %s\nR2 %s\nVout %s\nDissipation %s\nFactor %f" % (
+        format_value(best_r1, u'Ω'),
+        format_value(best_r2, u'Ω'),
+        format_value(best_v_out, 'V'),
+        format_value(v_in * v_in / best_r1, 'W'),
+        best_r2 / (best_r1 + best_r2)
+    )
+
+
+def main():
+    print "\nPower supply UVLO divider"
+    choose_resistors(30, 1.3, 'upper')
+
+    print "\nPower supply feedback divider"
+    choose_resistors(5, 1.225, 'lower')
+
+    print "\nUnidirectional sensor"
+    choose_resistors(5.1, 3.3, 'lower')
+
+if __name__ == '__main__':
+    main()
diff --git a/velocomputer/velocomputer-cache.lib b/velocomputer/velocomputer-cache.lib
index 712ad97..23c2cc2 100644
--- a/velocomputer/velocomputer-cache.lib
+++ b/velocomputer/velocomputer-cache.lib
@@ -1,6 +1,29 @@
 EESchema-LIBRARY Version 2.3
 #encoding utf-8
 #
+# BC807
+#
+DEF BC807 Q 0 0 Y N 1 F N
+F0 "Q" 200 75 50 H V L CNN
+F1 "BC807" 200 0 50 H V L CNN
+F2 "TO_SOT_Packages_SMD:SOT-23" 200 -75 50 H I L CIN
+F3 "" 0 0 50 H I L CNN
+ALIAS BC808 BC856 BC857 BC858 BC859 BC860 MMBT3906
+$FPLIST
+ SOT?23*
+$ENDFPLIST
+DRAW
+C 50 0 111 0 1 10 N
+P 2 0 1 0 25 25 100 100 N
+P 3 0 1 0 25 -25 100 -100 100 -100 N
+P 3 0 1 20 25 75 25 -75 25 -75 N
+P 5 0 1 0 90 -70 70 -90 50 -50 90 -70 90 -70 F
+X B 1 -200 0 225 R 50 50 1 1 I
+X E 2 100 -200 100 U 50 50 1 1 P
+X C 3 100 200 100 D 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # CONN_01X04
 #
 DEF CONN_01X04 J 0 40 Y N 1 F N
@@ -241,7 +264,7 @@ X ADC_8/A7 8 -1950 -250 200 R 50 50 1 1 I
 X ADC_7/A6 9 -1950 -150 200 R 50 50 1 1 I
 X ADC_6/A5 10 -1950 -50 200 R 50 50 1 1 I
 X +5V 20 1950 850 200 L 50 50 1 1 w
-X A11 30 1950 -150 200 L 50 50 1 1 I
+X PWM1_4/CAN1_RD/USB_DM/PA11 30 1950 -150 200 L 50 50 1 1 I
 X ADC_5/A4 11 -1950 50 200 R 50 50 1 1 I
 X B9 21 1950 750 200 L 50 50 1 1 I
 X PWM1_3/Serial1_RX/D2/PA10 31 1950 -250 200 L 50 50 1 1 I
@@ -264,7 +287,7 @@ X C14 17 -1950 650 200 R 50 50 1 1 I
 X B3 27 1950 150 200 L 50 50 1 1 I
 X B12 37 1950 -850 200 L 50 50 1 1 I
 X C13 18 -1950 750 200 R 50 50 1 1 I
-X A15 28 1950 50 200 L 50 50 1 1 I
+X PWM2_1/SPI1_NSS/A15 28 1950 50 200 L 50 50 1 1 I
 X VBAT 19 -1950 850 200 R 50 50 1 1 I
 X A12 29 1950 -50 200 L 50 50 1 1 I
 ENDDRAW
diff --git a/velocomputer/velocomputer.bak b/velocomputer/velocomputer.bak
index e01b2ac..32c0635 100644
--- a/velocomputer/velocomputer.bak
+++ b/velocomputer/velocomputer.bak
@@ -351,78 +351,6 @@ F 3 "" H 900 3250 50  0001 C CNN
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 L VDD #PWR010
 U 1 1 594C20AE
@@ -445,21 +373,12 @@ F 3 "" H 1300 3150 50  0001 C CNN
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 Text Label 6500 2000 0    60   ~ 0
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 $Comp
 L GND #PWR015
 U 1 1 5967D7B9
@@ -615,32 +507,18 @@ F 3 "" H 9600 2800 50  0001 C CNN
 $EndComp
 NoConn ~ 9600 1000
 NoConn ~ 9600 2600
-Wire Wire Line
-	13500 1000 13850 1000
 Text Label 13850 1000 0    60   ~ 0
 5V
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-	9600 1400 9000 1400
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 BAT_SIG
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 HALL_SIG
 NoConn ~ 9600 1100
 NoConn ~ 9600 1300
-Wire Wire Line
-	9600 1800 9000 1800
-Text Label 9000 1800 0    60   ~ 0
-THROTTLE
 NoConn ~ 9600 1700
 NoConn ~ 9600 2300
 NoConn ~ 9600 2200
@@ -654,7 +532,6 @@ NoConn ~ 13500 1400
 NoConn ~ 13500 1500
 NoConn ~ 13500 1600
 NoConn ~ 13500 1700
-NoConn ~ 13500 1800
 NoConn ~ 13500 1900
 NoConn ~ 13500 2000
 NoConn ~ 13500 2300
@@ -673,12 +550,8 @@ F 3 "" H 3200 4050 50  0001 C CNN
 	1    3200 4050
 	1    0    0    -1  
 $EndComp
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 Text Label 2400 3900 0    60   ~ 0
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 L GND #PWR016
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 Text Label 14050 2100 0    60   ~ 0
 SERIAL_RX
 Text Label 14050 2200 0    60   ~ 0
@@ -717,36 +582,230 @@ F 3 "" H 2800 3300 50  0001 C CNN
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 $EndComp
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 Text Label 9000 2500 0    60   ~ 0
 I2C_SDA
+$Comp
+L BC856 Q?
+U 1 1 596E83E6
+P 6200 3900
+F 0 "Q?" H 6400 3975 50  0000 L CNN
+F 1 "BC856" H 6400 3900 50  0000 L CNN
+F 2 "TO_SOT_Packages_SMD:SOT-23" H 6400 3825 50  0001 L CIN
+F 3 "" H 6200 3900 50  0001 L CNN
+	1    6200 3900
+	0    1    1    0   
+$EndComp
+Text Label 6000 4450 0    60   ~ 0
+5V
+$Comp
+L R_Small R?
+U 1 1 596E8742
+P 6650 4000
+F 0 "R?" H 6680 4020 50  0000 L CNN
+F 1 "R_Small" H 6680 3960 50  0000 L CNN
+F 2 "" H 6650 4000 50  0001 C CNN
+F 3 "" H 6650 4000 50  0001 C CNN
+	1    6650 4000
+	0    -1   -1   0   
+$EndComp
+$Comp
+L C_Small C?
+U 1 1 596E8991
+P 6900 4100
+F 0 "C?" H 6910 4170 50  0000 L CNN
+F 1 "C_Small" H 6910 4020 50  0000 L CNN
+F 2 "" H 6900 4100 50  0001 C CNN
+F 3 "" H 6900 4100 50  0001 C CNN
+	1    6900 4100
+	1    0    0    -1  
+$EndComp
+$Comp
+L GND #PWR?
+U 1 1 596E8A86
+P 6900 4350
+F 0 "#PWR?" H 6900 4100 50  0001 C CNN
+F 1 "GND" H 6900 4200 50  0000 C CNN
+F 2 "" H 6900 4350 50  0001 C CNN
+F 3 "" H 6900 4350 50  0001 C CNN
+	1    6900 4350
+	1    0    0    -1  
+$EndComp
+Text Label 7250 4000 0    60   ~ 0
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+Wire Wire Line
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 $EndSCHEMATC
diff --git a/velocomputer/velocomputer.sch b/velocomputer/velocomputer.sch
index e01b2ac..32c0635 100644
--- a/velocomputer/velocomputer.sch
+++ b/velocomputer/velocomputer.sch
@@ -351,78 +351,6 @@ F 3 "" H 900 3250 50  0001 C CNN
 $EndComp
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 L VDD #PWR010
 U 1 1 594C20AE
@@ -445,21 +373,12 @@ F 3 "" H 1300 3150 50  0001 C CNN
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 $EndComp
-Connection ~ 1300 3150
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 HALL
 $Comp
@@ -593,15 +494,6 @@ F 3 "" H 6350 3000 50  0001 C CNN
 $EndComp
 Text Label 6450 2850 0    60   ~ 0
 HALL_SIG
-Wire Wire Line
-	6150 2600 6350 2600
-Wire Wire Line
-	6150 3100 6350 3100
-Wire Wire Line
-	6350 2800 6350 2900
-Wire Wire Line
-	6350 2850 6450 2850
-Connection ~ 6350 2850
 $Comp
 L GND #PWR015
 U 1 1 5967D7B9
@@ -615,32 +507,18 @@ F 3 "" H 9600 2800 50  0001 C CNN
 $EndComp
 NoConn ~ 9600 1000
 NoConn ~ 9600 2600
-Wire Wire Line
-	13500 1000 13850 1000
 Text Label 13850 1000 0    60   ~ 0
 5V
-Wire Wire Line
-	9600 1400 9000 1400
 Text Label 9000 1400 0    60   ~ 0
 BAT_SIG
-Wire Wire Line
-	9600 1500 9000 1500
 Text Label 9000 1500 0    60   ~ 0
 AMP_LO_SIG
-Wire Wire Line
-	9600 1600 9000 1600
 Text Label 9000 1600 0    60   ~ 0
 AMP_HI_SIG
-Wire Wire Line
-	9600 1200 9000 1200
 Text Label 9000 1200 0    60   ~ 0
 HALL_SIG
 NoConn ~ 9600 1100
 NoConn ~ 9600 1300
-Wire Wire Line
-	9600 1800 9000 1800
-Text Label 9000 1800 0    60   ~ 0
-THROTTLE
 NoConn ~ 9600 1700
 NoConn ~ 9600 2300
 NoConn ~ 9600 2200
@@ -654,7 +532,6 @@ NoConn ~ 13500 1400
 NoConn ~ 13500 1500
 NoConn ~ 13500 1600
 NoConn ~ 13500 1700
-NoConn ~ 13500 1800
 NoConn ~ 13500 1900
 NoConn ~ 13500 2000
 NoConn ~ 13500 2300
@@ -673,12 +550,8 @@ F 3 "" H 3200 4050 50  0001 C CNN
 	1    3200 4050
 	1    0    0    -1  
 $EndComp
-Wire Wire Line
-	2400 3900 3000 3900
 Text Label 2400 3900 0    60   ~ 0
 5V
-Wire Wire Line
-	3000 4000 2300 4000
 $Comp
 L GND #PWR016
 U 1 1 5968273D
@@ -690,14 +563,6 @@ F 3 "" H 2300 4000 50  0001 C CNN
 	1    2300 4000
 	1    0    0    -1  
 $EndComp
-Wire Wire Line
-	3000 4100 2450 4100
-Wire Wire Line
-	3000 4200 2450 4200
-Wire Wire Line
-	13500 2100 14050 2100
-Wire Wire Line
-	13500 2200 14050 2200
 Text Label 14050 2100 0    60   ~ 0
 SERIAL_RX
 Text Label 14050 2200 0    60   ~ 0
@@ -717,36 +582,230 @@ F 3 "" H 2800 3300 50  0001 C CNN
 	1    2800 3300
 	1    0    0    -1  
 $EndComp
-Wire Wire Line
-	9600 2700 9000 2700
 Text Label 9000 2700 0    60   ~ 0
 3V
-Wire Wire Line
-	2600 3150 2200 3150
 Text Label 2200 3150 0    60   ~ 0
 3V
-Wire Wire Line
-	2600 3250 2200 3250
-Wire Wire Line
-	1100 2200 1400 2200
 Text Label 1400 2200 0    60   ~ 0
 GND
 Text Label 2200 3250 0    60   ~ 0
 GND
-Wire Wire Line
-	2600 3350 2200 3350
-Wire Wire Line
-	2600 3450 2200 3450
 Text Label 2200 3350 0    60   ~ 0
 I2C_SCL
 Text Label 2200 3450 0    60   ~ 0
 I2C_SDA
-Wire Wire Line
-	9600 2400 9000 2400
-Wire Wire Line
-	9600 2500 9000 2500
 Text Label 9000 2400 0    60   ~ 0
 I2C_SCL
 Text Label 9000 2500 0    60   ~ 0
 I2C_SDA
+$Comp
+L BC856 Q?
+U 1 1 596E83E6
+P 6200 3900
+F 0 "Q?" H 6400 3975 50  0000 L CNN
+F 1 "BC856" H 6400 3900 50  0000 L CNN
+F 2 "TO_SOT_Packages_SMD:SOT-23" H 6400 3825 50  0001 L CIN
+F 3 "" H 6200 3900 50  0001 L CNN
+	1    6200 3900
+	0    1    1    0   
+$EndComp
+Text Label 6000 4450 0    60   ~ 0
+5V
+$Comp
+L R_Small R?
+U 1 1 596E8742
+P 6650 4000
+F 0 "R?" H 6680 4020 50  0000 L CNN
+F 1 "R_Small" H 6680 3960 50  0000 L CNN
+F 2 "" H 6650 4000 50  0001 C CNN
+F 3 "" H 6650 4000 50  0001 C CNN
+	1    6650 4000
+	0    -1   -1   0   
+$EndComp
+$Comp
+L C_Small C?
+U 1 1 596E8991
+P 6900 4100
+F 0 "C?" H 6910 4170 50  0000 L CNN
+F 1 "C_Small" H 6910 4020 50  0000 L CNN
+F 2 "" H 6900 4100 50  0001 C CNN
+F 3 "" H 6900 4100 50  0001 C CNN
+	1    6900 4100
+	1    0    0    -1  
+$EndComp
+$Comp
+L GND #PWR?
+U 1 1 596E8A86
+P 6900 4350
+F 0 "#PWR?" H 6900 4100 50  0001 C CNN
+F 1 "GND" H 6900 4200 50  0000 C CNN
+F 2 "" H 6900 4350 50  0001 C CNN
+F 3 "" H 6900 4350 50  0001 C CNN
+	1    6900 4350
+	1    0    0    -1  
+$EndComp
+Text Label 7250 4000 0    60   ~ 0
+THROTTLE
+Wire Wire Line
+	1000 1600 1600 1600
+Wire Wire Line
+	1000 1400 1600 1400
+Wire Wire Line
+	2650 1600 2800 1600
+Wire Wire Line
+	2650 1400 2650 1700
+Wire Wire Line
+	2400 1000 2400 750 
+Wire Wire Line
+	2400 750  2800 750 
+Wire Wire Line
+	2400 1200 2400 1050
+Wire Wire Line
+	2400 1050 3100 1050
+Wire Wire Line
+	2800 950  2800 1300
+Connection ~ 2800 1050
+Wire Wire Line
+	3400 1050 4400 1050
+Connection ~ 2650 1600
+Wire Wire Line
+	2800 1300 2900 1300
+Wire Wire Line
+	3200 1550 3200 2100
+Connection ~ 3200 2100
+Wire Wire Line
+	3500 1300 3700 1300
+Wire Wire Line
+	3700 1050 3700 1900
+Connection ~ 3700 1050
+Connection ~ 3700 1300
+Wire Wire Line
+	3700 1600 3000 1600
+Wire Wire Line
+	2650 1400 2400 1400
+Wire Wire Line
+	2400 1600 2400 2100
+Wire Wire Line
+	2400 2100 3700 2100
+Connection ~ 4100 1050
+Connection ~ 3700 1600
+Wire Wire Line
+	4100 1050 4100 1500
+Wire Wire Line
+	650  1000 1600 1000
+Wire Wire Line
+	1000 1000 1000 1200
+Wire Wire Line
+	1000 1200 1400 1200
+Connection ~ 1000 1000
+Wire Wire Line
+	4100 1700 4100 2300
+Wire Wire Line
+	3100 1300 3300 1300
+Wire Wire Line
+	3200 1350 3200 1300
+Connection ~ 3200 1300
+Wire Wire Line
+	6150 800  6400 800 
+Wire Wire Line
+	6200 1300 6400 1300
+Wire Wire Line
+	6400 1000 6400 1100
+Wire Wire Line
+	6400 1050 6500 1050
+Connection ~ 6400 1050
+Wire Wire Line
+	950  3150 1550 3150
+Wire Wire Line
+	1550 3250 900  3250
+Connection ~ 1300 3150
+Wire Wire Line
+	1550 3350 1100 3350
+Wire Wire Line
+	1550 3450 1100 3450
+Wire Wire Line
+	1550 3550 1100 3550
+Wire Wire Line
+	1550 3650 1100 3650
+Wire Wire Line
+	6200 1750 6400 1750
+Wire Wire Line
+	6200 2250 6400 2250
+Wire Wire Line
+	6400 1950 6400 2050
+Wire Wire Line
+	6400 2000 6500 2000
+Connection ~ 6400 2000
+Wire Wire Line
+	7000 1750 7200 1750
+Wire Wire Line
+	7000 2250 7200 2250
+Wire Wire Line
+	7200 1950 7200 2050
+Wire Wire Line
+	7200 2000 7300 2000
+Connection ~ 7200 2000
+Wire Wire Line
+	6150 2600 6350 2600
+Wire Wire Line
+	6150 3100 6350 3100
+Wire Wire Line
+	6350 2800 6350 2900
+Wire Wire Line
+	6350 2850 6450 2850
+Connection ~ 6350 2850
+Wire Wire Line
+	13500 1000 13850 1000
+Wire Wire Line
+	9600 1400 9000 1400
+Wire Wire Line
+	9600 1500 9000 1500
+Wire Wire Line
+	9600 1600 9000 1600
+Wire Wire Line
+	9600 1200 9000 1200
+Wire Wire Line
+	2400 3900 3000 3900
+Wire Wire Line
+	3000 4000 2300 4000
+Wire Wire Line
+	3000 4100 2450 4100
+Wire Wire Line
+	3000 4200 2450 4200
+Wire Wire Line
+	13500 2100 14050 2100
+Wire Wire Line
+	13500 2200 14050 2200
+Wire Wire Line
+	9600 2700 9000 2700
+Wire Wire Line
+	2600 3150 2200 3150
+Wire Wire Line
+	2600 3250 2200 3250
+Wire Wire Line
+	1100 2200 1400 2200
+Wire Wire Line
+	2600 3350 2200 3350
+Wire Wire Line
+	2600 3450 2200 3450
+Wire Wire Line
+	9600 2400 9000 2400
+Wire Wire Line
+	9600 2500 9000 2500
+Wire Wire Line
+	6000 4000 6000 4450
+Wire Wire Line
+	6400 4000 6550 4000
+Wire Wire Line
+	6750 4000 7250 4000
+Wire Wire Line
+	6900 4200 6900 4350
+Connection ~ 6900 4000
+Wire Wire Line
+	13500 1800 14050 1800
+Text Label 14050 1800 0    60   ~ 0
+THROTTLE_PWM
+Text Label 6200 3700 0    60   ~ 0
+THROTTLE_PWM
+NoConn ~ 9600 1800
 $EndSCHEMATC