MinOPOSD setup

Introduction

Some years ago Joerg-D. Rothfuchs (JR63) added UAVTALK protocol to minimOSD firmware to allow communication between MinimOSD and OpenPilot boards.The MinOPOSD is born.

Useful info still available in the following pages:

• MinimOSD extra
• MinOPOSD Wiki

The OSD (On Screen Display) enables useful information to be superimposed on a video signal to an FPV pilot.

Connection diagram

All boards

Communication between flight controller and OSD is done using a serial telemetry at 57600bauds.

JST connector Main / Flexi port	Connector pin (board)	Description	MinimOSD
	1	GND	GND
	2	VCC	+5V
	3	Tx	Rx
	4	Rx	Tx

Please note Tx/Rx lines are crossed

Configure one port with telemetry at 57600bauds, can be MainPort or FlexiPort.

JST connector Revolution FlexiIO	Connector pin (board)	Description	MinimOSD
	1	GND	GND
	2	VCC	+5V
	7	Tx	Rx
	8	Rx	Tx
	9 (for programming)	DTR	GRN or DTR

Two options are available for telemetry output on FlexiIO (receiver) port:

TELEMETRY or PPM+TELEMETRY

Using Revolution board

With the Revolution board you can use the FlexiIO port for telemetry and optional DTR pin is wired with MinimOSD.

Please note the programming cannot be done without DTR pin wired.

First you need to setup Revolution board as follows :

1 - Connect Revolution board to the computer

2 - Go to the Configuration Tab and Hardware tab

3 - For USB VCP function, select ComBridge

4 - In Receiver Port, select ComBridge

5 - Save and reboot board

Now you can connect the receiver port with the minimOSD board, be sure the revolution board is powered with 5V

First update character set stored inside MAX7456 chip, be sure the video side is also powered. Some MinimOSD board need +12v on video side or 5v mods.

1 - Select the right port, in this example COM1

2 - Go to Options menu and Update Charset...

3 - Select the character set file (Charset_1_3_0.mcm) where you saved it on your hard drive.

4 - Wait the process is complete, this can take some time.

1 - Select the right port, in this example COM1

2 - Go to Options menu and Update Firmware...

3 - Select the firmware file (.hex) where you saved it on your hard drive. See Downloads.

4 - Wait the process is complete.

Video standard can be PAL or NTSC, selected by software and MinOPOsd talk with video chip to apply changes.

Go to Video Mode menu and select PAL or NTSC according to the camera used.

Don't forget the Save current tab to button to apply changes.

Disabled: No screen changes, stay in Panel 1

Mode Switch: Uses the FlightMode switch, if you switch from a FlightMode to another than back within 2 sec, than will jump to the next screen.

Ch5 to Ch8: Assign a channel for screen switching, should be 3 positions switch. Those "Channels" do not refers to real channel found in RC receiver but mapped like this:

• Ch5: The flight mode switch (this means you can see for example Panel1 in Attitude mode, Panel2 in Rate mode and empty screen in Rattitude mode),
• Ch6: The Accessory0 as defined in Input tab,
• Ch7: The Accessory1 as defined in Input tab,
• Ch8: The Accessory2 as defined in Input tab.

Rotation Switching option: When checked, a momentary switch can be used (Ch5 to Ch8 defined). Every time you move switch OSD jump to next screen. Panel1, Panel2, Empty, Panel1...

Only used with analog Rssi input pin

See https://code.google.com/p/minoposd/wiki/AnalogRSSI how to setup hardware and calibrate.

Defines the level that triggers the "Low battery" alarm.

• For analog vbat/current input pin (sensor connected to MinimOSD) see https://code.google.com/p/minoposd/wiki/FlightBatt
• For current sensor connected to Revolution board, check this page: Configure a Current-Voltage sensor

Select information to be displayed in the left list and place it on the grid.

Save current tab to button to apply changes.

There is some custom information in LibrePilot firmware, for example the "Temperature" field can display the barometer temperature (Revo boards) or TxPID values (useful when TxPID-EasyTune is used). See Rc OSD setup

Some parameters can be modified using the Rc transmitter, toggle switch and Pitch/roll stick.

Just after boot, move the Toggle switch and you enter the Setup screen. Pitch stick change parameter while Roll stick allow parameter/value adjustment:

• UAVTALK : Active or passive,
• TEMPDISP: Choose Baro temperature or TxPID values display for the "Temperature" field,
• BATTERY WARNING: adjust battery level.

Only with firmware using analog inputs:

• CALIBRATE: monitor volt/amp values and adjust factors/amp offset
  
  • Measured volt: Volt div ratio
  • Measured amps: Amps offset
  • Measured amps: Amps per volt

Refresh rates should be fine for normal (flight) use. For setup screen changes and easy stick response you should modify ManualControlCommand refresh rate.

1 - Go to System tab

2 - In UAVOBrowser click View options button and check Show Metadata

3 - Browse the the "Data" part and find ManualControlCommand UAVO

4 - Click the little arrow close to the Meta Data field

5 - Change Flight Telemetry Update Period to something lower, like 250ms

6 - Save changes

Others UAVObject rates can be modified and lowered as well, for smooth position and velocity changes:

• GPSPositionSensor
• GPSVelocitySensor