altoslib: Fix EasyMini voltage computations

[fw/altos] / altoslib / AltosConvert.java

diff --git a/altoslib/AltosConvert.java b/altoslib/AltosConvert.java
index 760d9eb98c273a0501f15aad1e09b4dc6a6dca67..35923ec3c3dbd1308e2f6d75b1959fcc760efa71 100644 (file)
--- a/altoslib/AltosConvert.java
+++ b/altoslib/AltosConvert.java
@@ -18,7 +18,7 @@
 /*
  * Sensor data conversion functions
  */
-package org.altusmetrum.altoslib_2;
+package org.altusmetrum.altoslib_3;
 
 public class AltosConvert {
        /*
@@ -224,10 +224,21 @@ public class AltosConvert {
                return sensor / 32767.0 * supply * 127/27;
        }
 
-       static double easy_mini_voltage(int sensor) {
-               double  supply = 3.0;
+       static double easy_mini_voltage(int sensor, int serial) {
+               double  supply = 3.3;
+               double  diode_offset = 0.0;
 
-               return sensor / 32767.0 * supply * 127/27;
+               /* early prototypes had a 3.0V regulator */
+               if (serial < 1000)
+                       supply = 3.0;
+
+               /* Purple v1.0 boards had the sensor after the
+                * blocking diode, which drops about 150mV
+                */
+               if (serial < 1665)
+                       diode_offset = 0.150;
+
+               return sensor / 32767.0 * supply * 127/27 + diode_offset;
        }
 
        public static double radio_to_frequency(int freq, int setting, int cal, int channel) {
@@ -290,10 +301,18 @@ public class AltosConvert {
                return meters_to_feet(meters) / 5280;
        }
 
+       public static double miles_to_meters(double miles) {
+               return feet_to_meters(miles * 5280);
+       }
+
        public static double meters_to_mph(double mps) {
                return meters_to_miles(mps) * 3600;
        }
 
+       public static double mph_to_meters(double mps) {
+               return miles_to_meters(mps) / 3600;
+       }
+
        public static double meters_to_mach(double meters) {
                return meters / 343;            /* something close to mach at usual rocket sites */
        }
@@ -306,6 +325,10 @@ public class AltosConvert {
                return c * 9/5 + 32;
        }
 
+       public static double f_to_c(double c) {
+               return (c - 32) * 5/9;
+       }
+
        public static boolean imperial_units = false;
 
        public static AltosDistance distance = new AltosDistance();
@@ -318,6 +341,8 @@ public class AltosConvert {
 
        public static AltosTemperature temperature = new AltosTemperature();
 
+       public static AltosOrient orient = new AltosOrient();
+
        public static String show_gs(String format, double a) {
                a = meters_to_g(a);
                format = format.concat(" g");