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Giving Kyosho iReceiver unlimited range*

15/03/2015 3 comments
_DSC2605

Kyosho EP Blizzard SR

Screen Shot 2015-03-15 at 13.17.24

iReceiver (c) Kyosho

A while ago I bought a version of Kyosho Blizzard, which features the new iReceiver which lets you control standard servos and ESC’s with your tablet or mobile phone. There’s also a camera fixed to Blizzard’s fuselage for streaming video. I didn’t have high expectations about the video performance but for the video the range is really poor. For controlling, the range is what you would expect for wi-fi device, about 50 m. The application however stops streaming the video as soon as it detects even a slight packet loss, which generally happens after 20 m. The thought arose, that since mobile networks are nearly ubiquitous, how about tunneling the traffic via 3g connection?

Hardware

Some device is needed, which acts as a VPN server and forwards the traffic to iReceiver. I used Beagleboard-XM for this, since it has multiple

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Test setup

USB ports. In this case two are needed, one for wi-fi adapter and one for 3g modem. Basically any Linux-running device would work, the performance does not play a role here. These instructions are for Ubuntu distro, but others would work too with some modifications. Trying this out also does not need you to modify your Blizzard in any way, except you need to strap the parts to it somehow (There’s nice flat space at the rear end of the model body).

Setting up 3g connection

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Huawei E230

Once you have your board booting and you have ssh access to it, the first task is to make the board to connect to Internet. For this 3g modem is needed. I used Huawei E230 for this since it seems to work with Ubuntu out of the box. Install wvdial, which does the “calling” to initiate connection

apt-get install wvdial

Edit /etc/wvdial.conf and put the following lines in it. You might need to change these, depending on your carrier. Google for proper settings. Note that you also need a connection, where you get real publicly accessible IP-address. In Finland only operator to offer this is currently DNA. There also might be some limitations which ports can be accessed. I use default ports in this post to keep it simple (NB. DNA also blocks most ports, so pay attention when setting up VPN). Also the SIM PIN is disabled for the sake of simplicity.

[Dialer dna]
Modem = /dev/ttyUSB0
Init = AT+CGDCONT=1,"IP","internet"
Phone = *99#
Stupid Mode = 1
Username = " "
Password = " "

Test that the connection works by starting the connection with “wvdial dna”

Setting up dynamic host name

Since your operator issues dynamic IP address, which may change on each connection, we need to set up a dynamic host name to connect to your device. First, go and create account to one of the dynamic host services. I used DynDns. Install ddclient, which takes care of updating your IP address

apt-get install ddclient

The install process asks you about your selected service and user name, so you are all set after that.

Connecting to iReceiver

First we need to find out your iReceiver name. They should all be unique, so multiple iReceivers can be in use at the same time. Install wireless tools

apt-get install wireless-tools

Power on your iReceiver to find out it’s name

iwlist scan

You should see something like this

Cell 05 - Address: 6C:71:D9:79:09:F8
       Channel:8
       Frequency:2.447 GHz (Channel 8)
       Quality=56/100  Signal level=56/100
       Encryption key:on
       ESSID:"iReceiver7909F8"

Copy the ESSID and insert following lines to your /etc/network/interfaces file

auto wlan0
iface wlan0 inet dhcp
    wpa-ssid "iReceiver7909F8"
    wpa-psk  "12345678"

Replace ssid with your essid. The password is always 12345678. Start the interface and check that it gets IP address from range 192.168.15.*

ifup wlan0

Setting up OpenVPN server

The VPN server is the essential part here. The Kyosho iReceiver application on your phone expects to be connected to the received via wi-fi and the receiver to be reachable at static ip-address. With VPN, we can create a tunnel to transport the data via Internet and at the same time make you phone to believe that iReceivers address is a local address, to which data can be sent directly. Generating various keys is the most laborious task and has been explained much better elsewhere, so go to this link https://help.ubuntu.com/community/OpenVPN and do the certificate and key generation for both server and client. Write following to /etc/openvpn/server.conf

# Change this if ISP blocks the default port
port 1194
proto udp
topology subnet
# Client address range
server 192.168.14.0 255.255.255.0
# Tell the client that 192.168.15.* network can be reached through VPN
push "route 192.168.15.0 255.255.255.0"
dev tun0

# Use correct key and certificate file names here
ca ca.crt
cert myservername.crt
key myservername.key
dh dh2048.pem
ifconfig-pool-persist ipp.txt
keepalive 10 600
comp-lzo
persist-key
persist-tun
verb 3
mute 20
status openvpn-status.log
client-config-dir ccd

Start the server with

service openvpn start

Setting up IP masquerading

Even though the client can now send packets to the iReceiver, not all things work. The iReceiver address is 192.168.15.2 and it issues client addresses from .3 forward. The iReceiver accepts streering packets happily from any address and you could drive around with the Blizzard, but the video would not work. The reason is that iReceiver ignores the video start packet, unless it comes from subnet 192.168.15.*. Now our VPN client gets address from 192.168.14.* subnet. To make this work, we use iptables to setup IP masquerading so that every packet going to wlan0 device appears to be originated from 192.168.15.* subnet.

iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE

Setting up VPN Client

On your Android device, install OpenVPN client. On client application, there’s no way to enter settings manually, so we need to create settings file. Create client.ovpn file with following text. Copy and paste your keys and certificates you generated previously. Also replace the hostname with the one you created previously.

client
dev tun
proto udp
remote yourdyndnshostnamehere 1194
tun-mtu 1454
nobind
persist-tun
comp-lzo
verb 3
mute 20
auth-nocache

<ca>
contents of .ca file here
</ca>

<cert>
contents of .crt file here
</cert>

<key>
client key here
</key>

Trying it out

After all the steps, trying it out is just starting VPN connection and launching iReceiver app. Drop a comment if there’s a bug in instructions, or some step needs clarifying! The same idea should work with any other wlan controller also, regardless of the brand.

“H-Series” Security camera

This post is mostly a note for myself, but might prove useful for other also. A while back I bought a security camera to my home from Dealextreme. It was typical Chinese quality with strange translations and weird software but worked nevertheless. I decided to buy another for my company and chose this model again from Dealextreme and thought that it’s the same camera with updated resolution. I was very wrong, this time the cameras internal software was so buggy that it almost made it unusable. The camera has no brand or name or anything, but the manufacturer is probably Wansview.

sku_109849_1

List of workarounds:

PebbleMondo

16/06/2014 2 comments
PebbleMondo beta

PebbleMondo beta

I recently switched from Sports Tracker to Runkeeper, because the latter one offers integration with the Pebble smart watch. However both of those refused to work with my Polar heart rate sensor so I ended up with Endomondo. I wanted to keep the Pebble integration, but apparently even though that there are few threads in the interwebs requesting this feature, it does not seem to be in the list for now.

Endomondo does not offer any API to query information, but I noticed that when it’s not the active application it posts a notification with some very useful information. Since I heard that it’s possible for Android application to catch the notification messages posted by other programs, I decided to write my own adapter for Pebble.

Example notification

Example notification

It proved to be quite difficult to extract the sent information since it’s wrapped into RemoteView object, which does not provide any useful way to tinker with its contents. Finally I found an example from the Stack Overflow which gives an example how do this. Unfortunately the only way seems to be using introspection which is never recommended but seems to work.

The application gets the following information:

  • Duration of exercise
  • Calories burned
  • Heart rate
  • Distance

The information is sent to Pebble’s built-in sports application, so no extra application slot is used from the watch. Unfortunately the watch app is not customizable. It has a display for pace and speed and neither of those is available from Endomondo, so I’m reusing those fields for calories and pulse. User can toggle between these numbers by pressing the middle button on the watch.

The watch application will start automatically when Endomondo starts pushing notifications. The included Android app only displays some instructions and is required by the Play store. The actual program runs as a service on the phone and it needs to be given access to application notifications from the settings menu.

Application source code is available here: https://gitorious.org/pebblemondo

Installable application is available from the Play store against small support fee: https://play.google.com/store/apps/details?id=com.jannem.pebblemondo

Disclaimer: This application is not associated with Endomondo® or Pebble®

Categories: Uncategorized

Thesis audiobook aka. Thesis grenade

Thesis grenade, almost finished
Thesis audiobook, contents missing

Idea

As a good friend of mine, Ville Kotimäki (who is also an excellent photographer btw) just finished his PhD, some figuring out some present to give was in order. I got an idea to machine some really solid piece out of aluminum and engrave it with text. I also wanted it to play something, as it seems to be a recurring theme for me.

The initial idea was to build a fire alarm siren inside an aluminum container, which would be welded shut and would only have ON button, but no means to turn it off. The idea was shortly scratched because also I would have to listen to it. The second iteration was to make the container read out the thesis like an audiobook.

Text

Fortunately I managed to recruit my friend Heikki to do all the laborious tasks. We started by downloading the thesis pdf. The pdf was converted to text and Heikki did they most annoying part of the project by cleaning the text files from badly converted items like equations, picture captions and tables etc. In the meanwhile I tried a few different speech synthesis programs. I would have liked to use some open source software, but most of them sounded like Stephen Hawking on a bad day.

The commercial Nuance was far superior to everything else I tried. Nobody seemed to have a license for it but there is a nifty feature in OS X that it has text to speech support by Nuance and from system preferences menu you can even download additional voices from Nuance. Heikki proceeded to write a script, which splits the text file to single pages. These pages are then converted to speech with “say” command in OS X and resulting AIFF files are converted to WAV files suitable for wav library we used in Arduino.

Container

The container itself was first drafted on a piece of paper. The measurements were dictated by the speaker we used (diameter 66mm) and the fact that on the inside there are speaker, 9v battery and power switch on top of each other. My brother machined the container shape from solid aluminum with a manual lathe from the drawing. Engraving and machining of the legs and drilling the bottom to let the sound out was designed with Alphacam software and machined with Haas UMC-750 5-axis machining center at my company G-Tronic.

I thought the engraving would be an easy job with Alphacam , but it turned out that the post processor which generates code for the machining center from cad drawing had a few nasty bugs resulting the tool occasionally to go through the work piece. Eventually I had to resort the help of professional machinists at the company, but (or because of that) the finished product looks great! The black effect on text is achieved by coloring it over with a black sharpie and wiping it over with a tissue dipped in acetone.

Electronics

The schematic for the device is really simple. SD-card is connected in parallel with ISP interface to ATMega328p. Since SD-cards operate with 3.3v voltage, LM328 regulator drops voltage from 9v battery to 3.3v. BC547 transistor acts as a extremely simple audio amplifier, switching 9v voltage to speaker commanded by processors pwm output. Not and audiophile solution but works surprisingly well in this case. Since Heikki wanted to learn some electronics, I just drew the schematic in Eagle and left him the job of figuring parts arrangement on the stripboard and soldering the parts together.

We had a great trouble with the first version. We tried to use LD1117V33 fixed voltage regulator. When measured, it outputted solid 3.3v but the ATMega just would not start to execute the code. The thing worked without problems when powered with PSU. Only explanation I can think about is that the regulator starts to oscillate, but when we checked the output with oscilloscope, there was nothing obvious visible. In the end we exchanged the regulator with trusty old LM328 and the problems went away. The circuit draws about 170 mA, which translates to roughly 3h of usage from 9v battery, but we figured out that no sane person wants to listen this for more than couple of minutes at the time. Note that the connector SV2 pinout is not the same than SD-card pinout! For example how to connect the SD-Card to avr, see here.

Firmware

The firmware itself is quite straightforward, the only difficulty was the user interface since there is only a power button and we did not want the device to start at the beginning of the book each time. We also wanted a couple of different voices to read the book. On the SD-card, audio files are saved with file name pattern <page (number)>-<voice (number)>.wav. When the device is turned on, it randomizes one of the three voices to use. Each time it finishes playing one page (one file), it saves the next page number to eeprom memory. When device is turned on, it starts to play from the saved page. If the device is turned off before it finishes to play back one page, the counter resets to the beginning of the book. There’s even a nifty page turn sound saved in every other file.

When we initially tested the setup on Arduino UNO board, we used TMRPCM library. It worked well, but on the final hardware, we used the internal 8MHz oscillator instead of 16MHz crystal and found out that the library does not support other that 16MHz clock speed. We changed the library to superior SimpleSDAudio, which enabled us to use 31.250 kHz sampling rate @ 8 Mhz. The library seemed also to have smaller compiled size, but that was irrelevant to us since we are only using 10k of 32k code space.

Result

I was really happy with the finished device. Some Ville’s friend dubbed the device to “Thesis Grenade”, which is quite accurate by the looks of it =) The video below is a little bit repetitive, I tried to demonstrate the different voices used, but the random generator decided to use one same voice for many times.

Timestamp support for OpenLog

OpenLog board

OpenLog board (Image) © Sparkfun


I needed a tool that can play back recorded serial stream “in real time”, so that the playback perfectly reflects the stream that was originally sent. Rather than building my own, OpenLog project seemed to be a perfect starting point. The board itself is very small, about the size of a micro-sd socket that is on the bottom of the board. By default the device records serial data received to standard ftdi-pinout serial port. The device is Arduino UNO compatible and code can be compiled and uploaded with the Arduino IDE. The device is configured by editing CONFIG.TXT file on the sd-card. If the file is not present on the card, the device creates one with default settings at the startup.

Example of config file:

115200,26,3,0,1,1,0,1
baud,escape,esc#,mode,verb,echo,ignoreRX,timestamp

As you can see, I added the timestamp option at the end. If this option is enabled, each received byte in the log file is prefixed with 4-byte unsigned long timestamp. The timestamp is in little endian order and in milliseconds. Unsigned long type provides about 55 days before counter rolls over. The value can be decoded for example in python with struct.unpack function:

buf = f.read(4)
timestamp = struct.unpack("<L", buf)[0]
char = f.read(1)

The logged files will be four times larger than without timestamping, but with large sd-cards this does not really make a difference. I quickly tested the performance and the device still seemed to be able to log the data without data drops at 115200 bps speed.

The modified codes are in my git repository: https://github.com/JanneMantyharju/OpenLog
I also made a pull request to the official repository, but let’s see will they accept it.

The python script that plays back the stream in real time can be found from the examples folder.

Categories: Electronics Tags: , , ,

DIY Remote shutter release for Samsung NX-series cameras

30/04/2013 117 comments

I’m using Samsung NX1000 for aerial photography. The camera has a nifty feature of using smartphone as a remote viewfinder and shutter release but unfortunately the good idea is watered by buggy and limited program and the feature freezes the whole camera all too often. Fortunately there is a simple way of triggering the shutter via cameras usb-port. The trick is to have 68K resistor between ID and GND pins. After this USB data lines can be used to trigger camera focus and shutter.

shutter

Schematic

Tip: If you have spare micro-usb cables, it’s easy to source a connector from the cable that came with the camera. Just squeeze black plastic around the connector with a pliers and the plastic casing will crack open exposing the connector. The connector on the cable has a small pcb, which makes it easy to solder the required resistor in place. If you use smd resistor, the casing can even be reassembled.

The cable described above works fine for manual use, but to use the camera for aerial photography some interface for rc receiver is needed. Fortunately this is easily achieved with a small arduino program, which reads pwm value from receiver servo port and then pulls either shutter or focus line low based on channel value. The compiled code size is under two kilobytes, so it’s possible to use small and inexpensive microcontroller like AtTiny2313.

rc_interface

RC interface for camera

The schematics and sources can be found at: https://gitorious.org/nxshutter/nxshutter

Compatible with (at least) following models: NX20, NX210, NX1000, NX1100 and NX2000

As with other hardware in this blog, if you need one and don’t want to make one yourself, drop me a message and we’ll see what we can do!

Update: If you don’t want to make your own, I’m selling these ready made. Just drop me a message.

Shutter PCB's

Shutter PCB’s

Showing APM telemetry data on Hitec Aurora’s screen (3rd edition)

28/02/2013 25 comments

This is the latest iteration of ArdupilotMega to Hitec telemetry adapter. This version does not require changes to APM code anymore, but instead functions as a standalone device. Displayed information has been changed a little bit, here’s the current mapping:

RPM 1 Distance to home
RPM 2 Airspeed
TEMP 1 Battery remaining (%)
TEMP 2 Throttle position
TEMP 3 Variometer (climb / sink rate)
TEMP 4 Armed status (1 = Armed)

It’s possible to rename the fields in Aurora like this:

Fixed fields (sat count, speed, altitude etc.) function as expected. Only thing that does not work is the date and time. Sadly it’s not possible any more to display “mAh used”, since as far as I can see there is not way to subscribe to that information in APM. I wonder if anybody opposes if I’d add MAVLINK message for that. Of course if you always use same capacity batteries this is not a problem, because you can check battery remaining reading from TEMP1, but since I have many different types of batteries, I’d need to change battery capacity parameter before each flight.

It’s possible to customize displayed data by airframe type, for example airspeed and variometer are probably not interesting to copter users, whereas Armed and heading might be. If you have suggestions, please tell me!

The adapter itself is simple and small. I designed PCB this time with SMD components this time to make it smaller. SAMSUNG CSCThe adapter connects to APM telemetry port and has a pass through to radio. When the adapter is powered up, it sends messages to APM to subscribe data feeds. When APM starts to send all the requested streams, adapter turns it’s UART off to avoid disturbing telemetry communication. There’s a place to mount fet on the top side of board to connect video transmitter power after adapter detects GPS fix. I added this feature since if I have my video tx on, getting GPS fix takes for ages.

I tried to save few euros by choosing ATMega168p as a processor since the code takes only 11KB, but I quickly found out that MAVLINK message handling uses a good amount of ram, so I changed MCU type to ATMega328p to schematic. It’s still possible to use 168, if you define MAVLINK_MAX_PAYLOAD_LEN to 35. Any smaller makes it impossible to receive position message and any larger crashed the program. Compile with 8MHz clock speed and when programming, check that “Divide clock by 8″ fuse on low fuse word is not programmed.

Schematic:

hss

Sources and Eagle files are uploaded to gitorious: https://gitorious.org/apm-hss-emulator/apm-hss-emulator

Now if I only could get my hands on some different brand radios (Spectrum, Futaba, Graupner…) I could try to make this adapter universal!

Have fun and tell me what you think!

Edit 1: I think I know now how to get the same system to work with Spektrum, but the problem is that I only have Hitec system. If somebody want’s to borrow me Spektrum radio, I can participate to costs.

Update: I have now professionally made PCB’s available if you want to buy these from me ready made

APM adapter

APM adapter

Categories: Electronics, FPV Tags: , , , ,
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