Eagle Tree OSD Pro - Manual (Page 4)

Copyright © 2009-2012 Eagle Tree Systems, LLC
http://www.eagletreesystems.com
Page 4
The OSD Pro supports saving and loading of OSD Configuration to XML files. This feature makes it easy to update multiple OSD Pros to have the same
settings, without reconfiguring each one. It is also useful to save your configuration before updating firmware, so that the configuration will be completely
restored after firmware update. See the “Configuring the OSD Pro with the Windows Software” section of the manual below for more information.
Graphical Battery Displays
Up to 3 graphical battery displays are supported. The graphical battery displays are enabled in the “Configure OSD Display” On-screen menu page. Note
that only the primary battery display is available if you are using your OSD with our Data Recorder. The additional two battery displays are available only
with the eLogger V3 and V4, at this time.
The primary battery is the one connected through the eLogger’s BATT input, or to your Data Recorder’s Electric Expander. No additional wiring is required
for the primary battery display. For the primary battery, remaining milliamp-hours is used to indicate battery fullness. For this to work correctly, you must
tell the OSD the capacity of your primary battery. This is done with the “Set Battery milliamp-Hours” menu item on the main on-screen menu.
The two secondary graphical battery displays (referred to as “Voltage B” and “Voltage C”) use voltage level to indicate the battery fullness. These are set
up by making special connections to the eLogger (using resistors), and the maximum and minimum voltages are configured under the “Sensors and Units”
on-screen menu.
If you want to use the secondary battery displays, please carefully read the following instructions, as incorrect wiring will damage your equipment. If you
don’t understand the instructions fully, don’t attempt it! Also, please visit the online forum discussion here, for more information or to ask questions:
http://www.rcgroups.com/forums/showthread.php?t=1128175
To use one or both of the secondary battery displays, you must follow these steps:
1.
Construct a probe for each additional voltage to monitor, consisting of a wire that
connects to your battery, a 15K Ohm resistor (preferably 1%), and a servo plug.
See the figure above. IMPORTANT: the resistor MUST be inline with the
probe, and the pack voltage must not exceed 16V, or the eLogger will be
damaged!
2. Connect the resistor probe(s) between the + (positive) lead of the additional
battery pack(s) to be measured, and the Temperature 2 (for “Voltage B”) or
Temperature 3 input (for “Voltage C”) on the eLogger (center pin of Temperature
input connects to probe). Note that this configuration assumes a common ground exists between the eLogger and each additional battery to be measured.
In most cases, ground is already shared. This will be true of the video battery, assuming the camera is connected to the OSD Pro, and is true of the
BEC/Receiver battery, assuming your receiver is connected to the OSD Pro. Note that neither the other two pins of the temperature inputs is ground!
3. In the OSD Pro on-screen menus, under the "Sensors and Units" menu, configure the temperature 2 input as a voltage monitor, by setting "Use Temp2
Input for Voltage B."
4. If “Voltage C” is also being used, enable the Voltage C option also.
5. Set the 0% and 100% endpoints of the batteries by changing the values of "Set Voltage B Minimum" and "Set Voltage B Maximum" and/or "Set
Voltage C Minimum" and "Set Voltage C Maximum"
6. Select the appropriate graphical batteries to display via the PC software, as described in the Configuring Graphics Display section below, or by using
the on-screen menus.
7. If you wish to display the numeric voltages of Voltage B and Voltage C, run the Data Recorder software, and add "Temperature B" and "Temperature
C" parameters, relabeling them to indicate the voltage that is being monitored.
Receiver Signal Strength (RSSI)
The OSD Pro (when used with an eLogger V4 or V3) can be used to display the received signal strength (RSSI) with many receivers. Note: this advanced
feature may require modification of your existing Receiver. As always, a pre-flight "Antenna Down" range check is critical after modifying your
equipment!
For questions regarding setting up RSSI, please visit this online thread:
http://www.rcgroups.com/forums/showthread.php?t=1130784
For measuring RSSI with analog receivers, the first step is to locate the RSSI
output of the receiver. There are several threads on RCGroups on how to do
this. We recommend searching for the model number of the receiver + RSSI, to
locate the pinout. It is recommended that a noise filter be added to the wire
connecting to the RSSI input. One such noise filter is a small toroid with 10-15
turns of wire, added to the connection. Also, some receivers require that only
a very high impedance load be connected to the RSSI output. See the
“impedance issues” section below. Range can be adversely affected if the
receiver requires a high impedance connection!
The next step is to connect the RSSI output to the middle pin of the eLogger's "Temperature 1" input.
To enable RSSI display, follow these steps:
a) Add the "Temperature Sensor A" parameter for display, at the screen lcoation you prefer, as described in the “Configuring the OSD Pro with the
Windows Software” section elsewhere in the manual. If desired, the on-screen display name of the parameter could be changed to "RSI" or "Sig" to indicate
that the parameter is for RSSI.