diff --git a/app/models/measurement.rb b/app/models/measurement.rb
new file mode 100644
index 00000000..2c39ebe6
--- /dev/null
+++ b/app/models/measurement.rb
@@ -0,0 +1,2 @@
+class Measurement < ActiveRecord::Base
+end
diff --git a/lib/controller.rb b/lib/controller.rb
index 1cdb96ff..0bf40af0 100644
--- a/lib/controller.rb
+++ b/lib/controller.rb
@@ -193,7 +193,7 @@ class Controller
             when "PIN WRITE"
               $bot_hardware.pin_std_set_value(command_line.pin_nr, command_line.pin_value_1)
             when "PIN READ"
-              $bot_hardware.pin_std_read_value(command_line.pin_nr)
+              $bot_hardware.pin_std_read_value(command_line.pin_nr, command_line.external_info)
             when "PIN MODE"
               $bot_hardware.pin_std_set_mode(command_line.pin, command_line.pin_mode)
             when "PIN PULSE"
diff --git a/lib/database/dbaccess.rb b/lib/database/dbaccess.rb
index 45e06c69..9b98a30d 100644
--- a/lib/database/dbaccess.rb
+++ b/lib/database/dbaccess.rb
@@ -7,6 +7,7 @@ require './app/models/command_line.rb'
 require './app/models/refresh.rb'
 require './app/models/log.rb'
 require './app/models/parameter.rb'
+require './app/models/measurement.rb'
 
 # retrieving and inserting commands into the schedule queue for the farm bot
 # using sqlite
@@ -153,10 +154,10 @@ class DbAccess
   # read measurement list
   #
   def read_measurement_list()
-    measurements = Measuerements.find(:all)
+    measurements = Measurement.all
     measurements_list = Array.new
 
-    measurement.each do |meas|
+    measurements.each do |meas|
       item =
       {
         'id'         => meas.measurement_id,
@@ -164,17 +165,18 @@ class DbAccess
         'timestamp'  => meas.created_at,
         'value'      => meas.value
       }
-      measurement_list << item
+      measurements_list << item
     end
 
-    measurement_list
+    measurements_list
   end
 
   # delete a measurement from the database
   #
   def delete_measurement(id)
-    Log.where("measurement_id = (?)", id).find_each do |log|
-      log.delete
+    if Measurement.exists?(id)
+      meas = Measurement.where("measurement_id = (?)", id).first
+      meas.delete
     end
   end
 
diff --git a/lib/hardware/gcode/ramps.rb b/lib/hardware/gcode/ramps.rb
index 73db3e5e..e282c67c 100644
--- a/lib/hardware/gcode/ramps.rb
+++ b/lib/hardware/gcode/ramps.rb
@@ -34,13 +34,13 @@ class HardwareInterface
 
     @bot_dbaccess = $bot_dbaccess
 
-    @axis_x_pos = 0
-    @axis_y_pos = 0
-    @axis_z_pos = 0
+    @axis_x_pos            = 0
+    @axis_y_pos            = 0
+    @axis_z_pos            = 0
 
-    @axis_x_pos_conv = 0
-    @axis_y_pos_conv = 0
-    @axis_z_pos_conv = 0
+    @axis_x_pos_conv       = 0
+    @axis_y_pos_conv       = 0
+    @axis_z_pos_conv       = 0
 
     @axis_x_steps_per_unit = 0
     @axis_y_steps_per_unit = 0
@@ -48,10 +48,12 @@ class HardwareInterface
 
     load_param_values_non_arduino()
 
-    @device_version   = 'unknown'
-    @param_version_db = 0
-    @param_version_ar = 0
-    @params_in_sync   = false
+    @device_version        = 'unknown'
+    @param_version_db      = 0
+    @param_version_ar      = 0
+    @params_in_sync        = false
+
+    @external_info         = ""
 
   end
 
@@ -68,8 +70,11 @@ class HardwareInterface
 
   # read standard pin
   #
-  def pin_std_read_value(pin)
-    execute_command("F42 P#{pin}", false, @status_debug_msg)
+  def pin_std_read_value(pin, external_info)
+    @external_info = external_info
+#    execute_command("F42 P#{pin}", false, @status_debug_msg)
+    execute_command("F42 P#{pin}", true, true)
+    @external_info = ''
   end
 
   # set standard pin mode
@@ -412,6 +417,11 @@ class HardwareInterface
     @bot_dbaccess.write_parameter(param['name'],value)
   end
 
+  # save a pin measurement
+  #
+  def save_pin_value(pin_id, pin_val)
+    @bot_dbaccess.write_measuements(pin_val, @external_info)
+  end
 
   ## ARDUINO HANLDING
   ## ****************
@@ -560,6 +570,27 @@ class HardwareInterface
         end
       end
 
+    when 'R41'
+      pin_id  = -1
+      pin_val = 0
+
+      text.split(' ').each do |param|
+
+        par_code  = param[0..0].to_s
+        par_value = param[1..-1].to_i
+
+        case par_code
+        when 'P'
+          pin_id  = par_value
+        when 'V'
+          pin_val = par_value
+        end
+      end
+
+      if pin_id >= 0
+        save_pin_value(pin_id, pin_val)
+      end
+
     when 'R81'
       text.split(' ').each do |param|
 
diff --git a/lib/messaging/messagehandler.rb b/lib/messaging/messagehandler.rb
index dc266e68..9756e3ef 100644
--- a/lib/messaging/messagehandler.rb
+++ b/lib/messaging/messagehandler.rb
@@ -8,6 +8,8 @@ class MessageHandler
 
   attr_accessor :message
 
+  ## general handling messages
+
   def initialize
     @dbaccess = DbAccess.new
     @last_time_stamp  = ''
@@ -16,7 +18,7 @@ class MessageHandler
   # A list of MessageHandler methods (as strings) that a Skynet User may access.
   #
   def whitelist
-    ["single_command","crop_schedule_update","read_parameters","write_parameters","read_logs","read_status"]
+    ["single_command","crop_schedule_update","read_parameters","write_parameters","read_logs","read_status","read_measurements","delete_measurements"]
   end
 
   # Handle the message received from skynet
@@ -66,7 +68,7 @@ class MessageHandler
         self.send(requested_command, message)
       else
         @dbaccess.write_to_log(2,'message type not in white list')
-        self.error(message)
+        send_error(sender, time_stamp, 'message type not in white list')
       end
     rescue Exception => e
       err_snd = true
@@ -114,7 +116,7 @@ class MessageHandler
 
       @last_time_stamp = time_stamp
 
-      measurement_list = @dbaccess.read_measurements()
+      measurements_list = @dbaccess.read_measurement_list()
 
       return_message =
         {
@@ -146,7 +148,7 @@ class MessageHandler
       @last_time_stamp = time_stamp
 
       if payload.has_key? 'ids'
-        message_contents['ids'].each do |id|
+        payload['ids'].each do |id|
 
           @dbaccess.delete_measurement(id)