Commit currently running fet12v2 code

Works on the real power-wheels cart. Can't say too much more about it;
leaving more substantial clean-up for later.

Change-Id: I1b06b04f5cc52240c028b48828d76873e86c26c1
diff --git a/motors/algorithms.h b/motors/algorithms.h
index 63d6d19..c67383b 100644
--- a/motors/algorithms.h
+++ b/motors/algorithms.h
@@ -2,6 +2,7 @@
 #define MOTORS_ALGORITHMS_H_
 
 #include <stdint.h>
+#include <array>
 
 namespace frc971 {
 namespace motors {
@@ -26,6 +27,22 @@
 // and the corresponding outputs will be inversely proportional to the weights.
 BalancedReadings BalanceReadings(ReadingsToBalance to_balance);
 
+inline BalancedReadings BalanceSimpleReadings(
+    const ::std::array<float, 3> readings) {
+  float offset = 0;
+  for (int i = 0; i < 3; ++i) {
+    offset += readings[i];
+  }
+
+  offset = offset / 3.0f;
+
+  BalancedReadings r;
+  for (int i = 0; i < 3; ++i) {
+    r.readings[i] = static_cast<float>(readings[i]) - offset;
+  }
+  return r;
+}
+
 inline BalancedReadings BalanceSimpleReadings(const uint16_t readings[3]) {
   float offset = 0;
   for (int i = 0; i < 3; ++i) {