Hi Everyone,
I thought it might be useful to give a bit of background on what this forum is for.
3DRobotics have just released a set of telemetry radios based on the Si1000 chipset. The ArduPilot developers (particularly Mike Smith and myself) have been working hard on the firmware for these radios for months now, trying to make them ideal for APM telemetry.
These radios are unusual as they are open source and extremely configurable. That means that there is a lot of scope for diydrones members to get involved in tuning of the radios, and in adding new functionality. That is what this forum is for.
The Si1000 chipset has a huge number of configuration registers. We've spent quite a lot of time selecting the best register values for use with APM, but there is still a lot of scope for more experimentation. For example, I'm planning to do a test flight soon to see if enabling manchester encoding gives better or worse range at various data rates.
Similarly, there is a lot of scope for adding firmware features to make these radios link really well with antenna trackers and other radio add ons. We've already got them talking to APM in a much more advanced way than an Xbee can, but there is a lot of scope for taking it even further.
The basic theme is that these are DIY radios. We've put together functionality to make them work really well already, but the real potential is from the community getting involved to make them even better.
So get involved, and let's bring to telemetry radios the same sort of community development that has made ArduPilot so much fun to be involved with!
Cheers, Tridge
Replies
I want to compile the firmware of this module.
I used http://www.silabs.com/support/pages/software-downloads.aspx Silabs compiler.
But nothing straight forward. ... is there a guidance for compiling this firmware.
Best Regards,
M. Hefny
Hi, I am going to replace the standard 2dbi 433mhz 3DR antenna coz the signal is limited about 100m. What is the best replacement for the air and ground antenna so the data it can reach up to 3km?
I just got my new 915 MHz installed and it works great with the default settings. I do have a couple of questions:
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I noticed an earlier post about using gold plated right angled headers on the 915MHz air module. I received two Telemetry kits from the DIYDrones stores and both had the following cheaper tin plated headers, so now I have to find an alternative supplier before I can use my radios. This was a surprise since the store shows nice gold plated headers but they shipped me something entirely different which is annoying. I am not sure why you would go to all the trouble of having gold plated pad on the telemetry module and then provide a lower grade tin metal header instead of matching gold plate?
The above is what I received. The following is a photo from the store of the 6 pin right angled header.
There is another issue at the moment with the SMD style 3DR telemetry modules I received, (not the original DIL purple board) and I am not sure if anyone else has noticed this. Both my air and ground modules have a few areas where some attention is needed to fix up incomplete soldering. On the ground modules there was no solder on one pin from the USB port and I remember reading someone else had the whole connector fold up while trying to plug in the usb into the computer. What is a larger concern is the soldering of the HM-TRP radio modules. Although the soldering is reverse flow through the board connector holes, several areas on my air modules looked to have little or no solder. Consequently I have reworked the soldering so there is a little more material for the HM-TRP radio modules. The picture below is my reworked air module.
I notice a few people report intermittent module link up so perhaps have a closer look at the soldering of the HM-TRP radio modules?
You can see the solder filets I have added to the edge of the HM-TRP radio module. I have also touched up the soldering in different places on the ground module e.g USB connector as I am using the 915Mhz version.
Its a pity there is no way to order the DIL version of the air module. These are discontinued as the shop is setup to make the SMD version which speeds up the process. the purple boards look to be a better build quality.
Finally can someone confirm if a special TTL 3.3v to 5V cable is needed to connect the air module to the APM1 board. I see there is a need to buy a separate 3.3V FTDI cable to program the air module which is not available from the diydones store. They do not list this as an accessory under the telemetry section either, so it means the kits I have are unusable as like some the ground and air modules are being shipped out with different versions of firmware. So I assume that since a 3.3V TTl is needed to program the air module the stated 5V connection to the APM 1 may be wrong as well as the doco which states the device is connected to TX RX 5+V and ground?
Got my 433mhz radios today 4/23/12. Looks good.
Hooked USB cable to laptop and with a terminal program talked to radio at 57kb fine.
Did an ATI5 and data returned as expected.
Hooked other radio to APM2 with supplied cable.
Both radios the green lights went solid meaning they are locked to each other.
I did an RTI5 and the APM2 radio responded as expected.
Did ATI7 and RTI7 and got expected data.
Great so far !!!!
Now at this point I expect the radios to send mavlink data from APM2 to the laptop.....NO GO ....
I even tried the mission planner. Did a control a and got both radios settings. Great !!
The problem seems to be the APM2 is not talking to the radio. Cable miswired ??? I don't think so. TX > RX and RX > TX
The APM2 telemetry data rate is set to 57kb. Verified by USB cable on APM2 to get setup data.
Sh....T. I think I know why the radio is not sending data. THE USB CABLE on the APM2 is still connected !
I will unplug and try again........
Earl
Tridge, many thanks for the work in doing this. I've had such bad luck with xbees that I never want to depend on them.
I tried ordering a set, but it's backordered due to an apparent shortage of header pins. Hope those are easy to get somewhere! :-)
This would be great for ham radio APRS to track balloons and other aircraft via aprs. I ordered 3 units to experiment with in the 433mhz band. Imagine an APM2.0 on a balloon with this radio sending Mavlink data via the APRS system. I am involved with a group doing a balloon launch this fall so I will bring this radio to their attention. By putting the APRS on the internet, a lot of people can watch this launch in real time. Now to figure how to take pictures and put them on internet at the same time. That would be cool.
Earl