+/*
+ * Voltage divider on ADC battery sampler
+ */
+#define AO_BATTERY_DIV_PLUS 56 /* 5.6k */
+#define AO_BATTERY_DIV_MINUS 100 /* 10k */
+
+/*
+ * Voltage divider on ADC igniter samplers
+ */
+#define AO_IGNITE_DIV_PLUS 100 /* 100k */
+#define AO_IGNITE_DIV_MINUS 27 /* 27k */
+
+/*
+ * ADC reference in decivolts
+ */
+#define AO_ADC_REFERENCE_DV 33
+
+/*
+ * GPS
+ */
+
+#define AO_SERIAL_SPEED_UBLOX AO_SERIAL_SPEED_9600
+
+#define ao_gps_getchar ao_serial3_getchar
+#define ao_gps_putchar ao_serial3_putchar
+#define ao_gps_set_speed ao_serial3_set_speed
+#define ao_gps_fifo (ao_stm_usart3.rx_fifo)
+