Millswood Engineering Failsafe Device


I’m pleased to report that Millswood Engineering have delivered their first Failsafe Device, and are now available for sale. The failsafe device was developed to conform to the requirements of the 2009 UAV Outback Challenge, but is also capable of being used as a flight termination system, gimbal (pan/tilt/zoom) control mechanism, payload control device, autopilot communications interface, remote control of vehicle through telemetry and more. Some of these capabilities will be progressively showcased in the coming weeks.

The Failsafe Device gathers together all of those annoying electronic bits and pieces that infest UAVs, and integrates them into a single unit. Things like RS232 level converters, radio modem carrier boards, receiver/autopilot multiplexers, battery eliminator circuits, serial servo controllers, and redundant power supply switches. All of these functions have been integrated onto a single PCB that plugs directly into a Digi XTend OEM RF Module.

Here's a quick feature summary:

-Provides mechanical mounting for the Digi XTend radio modem.
-Provides full-duplex RS232 access to both autopilot and radio modem.
-High efficiency 2A switching power supply.
-In conjunction with a ServoStation, provides a fully redundant power system for telemetry radio, autopilot, RC receiver and servos.
-Delayed power to the radio modem on power-up allows autopilot to initialise without RF interference.
-Allows RC control to override failsafe activation.
-Fully programmable failsafe operation (on/off, timeout period, heartbeat string).
-Activation of failsafe can be reported on telemetry downlink with a user programmable message string.
-8 channel serial servo controller built-in, with precision 12-bit hardware PWM generation.
-PWM channel switching performed in hardware by a programmable logic device, giving consistent low-latency signal path delays.
-Both Mini SSC II and Pololu commands supported natively. No need to set any jumpers or cycle the power.

More details can be found here; http://www.millswoodeng.com.au/failsafe_device.html

A detailed manual can be found here; http://www.millswoodeng.com.au/documents/fd_datasheet.pdf

I'll be publishing photos and video in the near future.

Views: 158

Comment by Mogly (Umesh Tharanath) on August 17, 2009 at 6:56am
Woww this perfect what i need. It is made for Digi XTend OEM RF Module which iam using. it is long range too (41 miles allmost 63km line of sight).

Where i can buy this ?

Is there any impact on ArduPilot (Code or Modifications in Hardware) ?

Does it suppoert built in Camera ? Since Digi XTend OEM RF Module is capable of 115 Kbps data transmition. which can trasmit streaming video too. (as some one did RX/ TX [RC radio] using Xbee Pro small module.)

In Failsage device i is mentiond that it has 8 cha servos and it also says 5 ch RC in the diagram. how additional 3 ch servos going to work ? (well I am not much into electronics).


This is nice breakthrough though!!! :)
Comment by Ho-Chung Chang on August 17, 2009 at 8:17am
Beautiful Board

Developer
Comment by Pat Hickey on August 17, 2009 at 8:08pm
How soon can I buy one of these in the US? This board solves a lot of problems I've been working on, and I'd much rather buy one than build my own.
Comment by Ios on August 17, 2009 at 8:44pm
@Mogly, the board should be compatible with Ardupilot, Paparazzi, and Attopilot, but hasn't been tested on all yet. One of the outstanding features is indeed that it is made for the Digi XTend which is a very long range data modem, and the board is very small.

@Otto Pilot, The board is available for purchase directly from Millswood Engineering - Their contact details are here.
Comment by Andrew Dunlop on August 18, 2009 at 6:58am
@Mogly, very glad you like it, we worked quite long and hard to get it right.

You are quite correct, the Failsafe has 8 channels throughout, to drive the last 3 or 4 channels you have a few options. If you have an 8 channel RC receiver, then that is one possibility, but perhaps not the best one, as you would need to remain within RC range (and pull a few tricks with the wiring).

There is a variant - the Failsafe PTZ (for pan, tilt, zoom) - which has channels 5, 6, 7 and 8 dedicated to telemetry applications. These channels have no connection with the autopilot or RC receiver, but are controlled purely and simply by serial commands sent from the ground control station up the telemetry link. This is probably the best way to access the extra channels. Of course, you need to have some software on the ground that can send the right commands.

The details will be on www.millswoodeng.com.au in a day or two.

@Otto pilot, as Nick said, please drop me an email, I'd much rather you bought one too :-)

Cheers,
Andrew.

Comment by Mogly (Umesh Tharanath) on August 18, 2009 at 9:31am
Awesome.. Andrew Dunlop!!!! ThanksUsomuchforReply...

Is it comes with any software (Opensource ?) hopefully yes.
This would lead us use telemetry link for other purpose too.
Like Temp Sensors,
hummidity Sensor,
Cam pan tilt,
Leaser Scan assulator,
picking/droping the object,
Parachute What not.. ??? You name it we can do it. :D Sweeet...
Only telemetry radio link without RC RX... sounds cool.... Manual and Automatic all with Radio Modem..
No more problems with range or RC radio, number of channels.. all that headaches....

I am excited to workon this.... Please some one tell me how much this would cost.. and how fast we can get this..in our hands. ( considering DIYDrones dilivery :( almost a month did not get my ArduPilot Shield Kit & AttoPilot XYZ Horizon Sensor till now..)

- Mogly
Comment by Andrew Dunlop on August 19, 2009 at 3:12am
Sadly no software.

However, the protocol to drive the servos is simple and well-defined: you can use either the Scott Edwards Mini SSC II protocol (which is very simple), or the Pololu SSC protocol, along with a few Pololu-style additions. Or both simultaneously if you like. There are programming examples floating around on the web to draw inspiration from.

Not sure about temp and humidity sensors; the Failsafe is mainly a control rather than measurement device.

A Failsafe is $160 (Australian) for the standard version, or $180 for the PTZ, plus postage to your part of the world. Delivery would be a couple of weeks (my current units are all spoken for).

Andrew.
Comment by Ios on August 29, 2009 at 10:00pm


Here is a small demo application which is now available from Millswood Engineering, which works with all versions of the device.
Comment by Ios on September 19, 2009 at 3:09am
Here is a video of what the PTZ is capable of doing :)

http://www.youtube.com/watch?v=w3EDB1PmtSE
Comment by Morli on September 29, 2009 at 1:17pm
By far the best ancillary product I have seen. good job guys. keep it up. We ( amateur UAV guys) won't be doing well without you supporting us. You top my wish list. Hope lot more of professionals are doing what you are doing.

regards
Morli

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