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Old Jul 14, 2011, 08:04 AM
Martin - AKA mr.sneezy
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FrSky 2.4Ghz - Telemetry Hub & Sensor discussion

Time to post up some first looks at the new DHT-U LCD screen and the matching telemetry hub and it's sensors. I have a set of gear to check out and test.
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Old Jul 14, 2011, 08:16 AM
Martin - AKA mr.sneezy
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The hub

The telemetry sensor hub (the bit that reads the sensors and sends the information to the RX for transmission down to the TX handset).

My first thought when I popped it out of the bag was 'gee it's smaller than I expected'. It's both thinner and lower footprint than expected really. It uses narrower pitch header connectors than servos etc, somewhere around 1.2mm pitch.
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Old Jul 14, 2011, 08:24 AM
Martin - AKA mr.sneezy
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Vario FVAS-01 first look

The vario (sensor for height change).
I'm not sure yet but I think it's got a Bosch BMP085 sensor in it. I'll open it next week and see. I've seen that sensor before somewhere
Again it's small, size of a postage stamp and only a few mm thick.
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Old Jul 14, 2011, 08:36 AM
Martin - AKA mr.sneezy
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Fuel Level Sensor first look FGS-01

OK, this thing will be interesting to test, as I have but one glow model now (all else is electric)...
I'm not a sensor expert by any means, but I think it's a capacitive device, meaning it might sense the effect of fuel next to the foil plates when it's on the side of the tank. It would measure the capacitive change between them (a small guess again, please tell us here if you know more than I do).
They would need a lot of input filtering in software to get a stable result, as the fuel would not stay still in the tank.
We'll see soon how good it can work. I have a spare tank I can do a simulation with.
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Old Jul 14, 2011, 08:47 AM
Martin - AKA mr.sneezy
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Temperature sensor TEMS-01

This looks like a standard glass bead thermistor. Not much to say at first look other than it's got nice teflon wire, and it's near 30cm from plug to sensor.
It's very similar to the ones used on my Eagle Tree E-logger, but I think it's a different value (not compatible).
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Old Jul 14, 2011, 08:56 AM
Martin - AKA mr.sneezy
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GPS and the three axis Accelerometer (GPS-01 & TAS-01)

The system has a GPS sensor, and also a three way accelerometer sensor.
The GPS is an easy way to get ballpark values for position, height and speed. I guess the accelerometer will measure G-force when turning tight or climbing.
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Old Jul 14, 2011, 09:03 AM
Martin - AKA mr.sneezy
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RPM (revolution speed) sensor RPMS-01

Again it's quite small, for an optical device anyway.
On my Eagle Tree logger I found the RPM sensor to be quite useful, and I suspect this sensor will be useful on the FrSky hub system.
One thing occurred to me right away is monitoring head speed in flight with my helicopter. I'll try pointing it up through the main rotor arc or through the main gear. Normally it's used to measure propeller RPM on a plane.
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Old Jul 14, 2011, 09:08 AM
Martin - AKA mr.sneezy
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More to come

I know the above first looks are very light on measured results and data, but as I have some commitments till next week that have to be done first.

In the meantime, if there are specific questions about the devices that need to be asked (and answered) then let me know and I'll try. Specific though, not like 'how good is it'. That sort of answer will take weeks to know about.

I'll get back on the thread next week and see whats come to mind.

Martin
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Old Jul 14, 2011, 09:18 AM
Dean
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WOW! Unless you have big hands the airborne bits are smaller than I was expecting and the dashboard is a proper size. Good on FRSky.

Now to see what the price will be....
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Old Jul 14, 2011, 11:46 AM
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I still have a problem with FRSKY.

Some of us are using an OSD and googles to fly in FPV mode. Those informations can be usefull if they could be taken on a ground station, or catched to be chained on an I2C bus and sent to an OSD chain.

I've been trying unsuccessfully to ask them an analog RSSI port on their Telemetry receiver. Till up now, they don't took care of this wish.

This would have been great for people with googles as looking to a screen is difficult when you wear such things ;-)

Otherwise, it looks very promising. I hope this hub could also be used in conjunction with a future OSD the would make. Hope they do, and add also a stabilisation system, and they would have the first have it all flying solution...

I also hope they would proving a software for a ground station that would work with an RS232 interface like an FTDI cable.

I hope too that the data port is outgoing the data. If this is the case, it should be used for an OSD project.

There a too type of fuel gauge. Immersed and not immersed. But i can't tell you if this one is using capacitive or resistive technology. It depends of some factors that are not veiwable as is.

Would be really great as usual. I love their TX and RX even if i can't use the RSSI on an OSD directly. I had to make some soldering and build a buffer for that.
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Old Jul 14, 2011, 12:34 PM
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The new D4FR receiver outputs RSSI.
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Old Jul 14, 2011, 03:08 PM
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I'm not quite seeing what the antenna is for.
Does the telemetry module replace the Tx module?

ian
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Old Jul 14, 2011, 03:28 PM
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Yes, the choice of the name DHT-U was to suggest it is an Universal DHT.
The wires seen in the picture are not serial line to fed from Tx module, but power and PPM from Tx.
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Old Jul 14, 2011, 05:48 PM
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Aren't they going to have a display that can just plug into the Tx module and provide the same information? Similar to the Graupner Hot Box. Or isn't that possible with the current Tx module design? That was what I was looking for.
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Old Jul 14, 2011, 11:40 PM
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Quote:
Originally Posted by GBR2 View Post
Aren't they going to have a display that can just plug into the Tx module and provide the same information? Similar to the Graupner Hot Box. Or isn't that possible with the current Tx module design? That was what I was looking for.

Current FrSky LCD-fdd_lite can be plugged into the Tx module by a provided cable, show two analog voltages, Rx RSSI, Tx RSSI and is capable of programming alarm thresholds and directions on-screen: http://www.frsky-rc.com/ShowProducts.asp?id=91

We have been putting hands on another display, besides current functions of LCD-fdd_lite, it can show all monitored data. This new product is presumed to be ready within two months, let's look forward to that!
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