android g1 serial to arduino
TRANSCRIPT
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
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Android G1 Serial To Arduino Robotby mranalytical on January 24, 2010
Table of Contents
Android G1 Serial To Arduino Robot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Intro: Android G1 Serial To Arduino Robot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 1: Items needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 2: Android G1 with serial output enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Step 3: Install the Android Scripting Environment (ASE) with Python . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 4: Copy and run the cellbot.py script to launch the Python program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 5: Telnet into the G1 and test sending it commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 6: Connect a 3.3v to 5v level shifter to the Arduino . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 7: Load the Cellbots program on the Arduino . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 8: Run the whole process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Related Instructables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Intro: Android G1 Serial To Arduino RobotLearn how your Android cell phone can control a robot using an Arduino board. The phone takes commands via telnet from another phone or a PC, so you can controlthe robot remotely. This project will not otherwise modify the G1 so you can continue using it as your normal phone after undocking it.
Why?By using cheap electronic components such as Arduino boards, you can pair them with your $400 phone to make an awesome robot. It would cost hundreds of dollars toadd GPS, LCD's, motion sensors, wi-fi, cellular connections, speakers, and more to a hobby bot, but your phone already has these!
Together, the Android G1 and Arduino board allow you to use inexpensive electronics such as simple servos and sensors, to build powerful devices such as robots,remote telepresence, or fun toys for kids. More information at Cellbots.com .
Notice: This project currently requires an Android G1 with root access to use serial output from the phone to the Arduino robot. You can add a $20BlueTooth module to your Arduino board to have the phone talk to it over serial BlueTooth if you want to use the commercial Android software.
Special thanks: We have the Hacker Dojo in Mountain View, CA to thank for putting us in touch, helping with some tricky issues via their mailing list of awesomemembers, and for having 74LS04 chips in stock. Most of the assembly was done at the Tech Shop in Menlo Park.
Image Notes1. Goes to nothing
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Image Notes1. Freeduino SB2. Breadboard3. HTC USB and phone off screen in this direction
Image Notes1. This goes to pin 8 on the HTC USB board2. Goes to pin 8 ground on HTC USB board3. 5v power to the Arduino is at the other end of the breadboard and not in thispicture4. 5v Power5. Jump pins 2 and 3 together6. Connects to the RX pin 0 on the Arduino7. Ground8. Connects to ground on the Arduino at the other end of the breadboard out ofthis picture
Image Notes1. These two are not used during this tutorial but I used them when testing serialto USB from the other linked instructable2. Pins 7 and 8 are used to connect to your breadboard
Step 1: Items needed To complete this tutorial you will need the following:
Hardware:- Android G1 Dev Phone (or other Android device with root access and serial output)- Arduino (I'm using a Freeduino SB but any one should do)- 3.3v to 5v converter if you aren't using a 3.3v Arduino (I'm using a 74LS04 chip for under $1 but other options are available)- HTC USB break-out board for the G1- Soldering equipment for two quick connections- A robot body with micro servos (cardboard, acrylic, treads, wheels, anything will do)
Software:- Android Scripting Environment (ASE)- Telnet client for your PC (I'm using PuTTY on Windows)- Arduino development environment- (optional) Serial client for your PC (I'm also using PuTTY on Windows for this)- (optional) Android SDK
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
If you can follow instructions you can complete this tutorial with little knowledge of Python , Arduino, Android, or electronics. You'll want to know those things if you wantto go beyond a blinking LED but this will get you started.
Image Notes1. You can scan this with a barcode reader to download the apk file. Or go to theofficial project site.
Image Notes1. The TX0 pin of the HTC USB board connects here2. Connect these two togther3. This does to the RX pin 0 on the Arduino4. Connect to ground5. Connect to the 5v power from the Arduino
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Image Notes1. Use ddms from the Android SDK to take screen shots from your phone(among other tricks)2. Use adb shell from the Android SDK to execute commands from the PCinstead of typing them into the phone.3. I used PuTTY on Windows to telnet into the phone.
Image Notes1. We use the Android Dev Phone 1, also known as the G1 in this tutorial butADP2 should also work in theory.
Image Notes1. Android Scripting Environment (ASE) logo
Step 2: Android G1 with serial output enabledG1's do not ship with the ability to send serial commands out of the USB port and there is no native option to enable it. If you are an advanced Android SDK user youcould make your own build but I chose to use the Cyanogenmod 4.2.13 . If you know of other Android devices with serial out working, add them to the comments.
Optionally, you can follow the links there to this instructable on talking to your G1 over USB from your PC. That serial to USB connection isn't required for this tutorial but Iused it as a nice sanity check to verify the phone was sending serial out.
If you don't use the other intructable to verify serial output is working, you can try this simple check:1. Open the Terminal app on the G1 (comes with Cyanogen but download one from the Market if you have a different image)2. Navigate to the /dev/ directory by typing in cd /dev/3. Type ls (that's an L) and look for ttyMSM2 in the list returned
The Python script we'll use later sends commands to '/dev/ttyMSM2' in order for them to go out the serial connection. Since that requires root access, you'll need tochange permissions on that every time you reboot the phone. To do that:
1. Open the terminal app on the phone2. Enter 'chmod 777 /dev/ttyMSM2'
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Then you can run the Python script from the Android Scripting edit in the next step and it will have access to send serial output.
Image Notes1. We use the Android Dev Phone 1, also known as the G1 in this tutorial butADP2 should also work in theory.
Image Notes1. If you don't see this the phone does not have serial out enabled.
Step 3: Install the Android Scripting Environment (ASE) with PythonThe scripts we'll be using to create an open socket connection on the phone and send commands out is written in Python. To run this on the G1 we'll need the AndroidScripting Environment . If you don't see it in the Market you can download it by scanning the barcode on that page which links to the apk file on this page .
Once you install and run ASE you will want to add on the Python module from the menu:1. Open ASE and make sure you have a working internet connection (wi-fi or 3G)2. Press the menu button on the phone and select Interpreters3. Press menu again and select Add4. Select Python (currently v2.6.2 as of writing this) and it will download some zip files
You may want to explore creating, opening, editing, and running scripts to become familiar with Python via ASE but it isn't required.
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Image Notes1. Android Scripting Environment (ASE) logo
Image Notes1. You can scan this with a barcode reader to download the apk file. Or go to theofficial project site.
Step 4: Copy and run the cellbot.py script to launch the Python programThis tutorial uses a Python script to be the "brains" of the robot. Get the latest code from our open source Google Code project . You only need the cellbot.py file butothers may help with various things you want to explore. I simply plugged the phone into my PC's USB connection and mounted the drive before copying the file to/sdcard/ase/scripts.
The program creates an open socket connection to accept an incoming telnet session. It also prints the received commands to the screen while sending them out theserial port. Put this file on the phone's SD card in the /ase/scripts/ directory.
Detailed steps to load and run the scripts:1. Copy the cellbot.py script to the SD card's /ase/scripts/ directory2. Be sure to dismount the SD card from your PC if you copied them that way since the phone can't access the files at the same time your PC is.3. Open the Android Scripting Environment app4. Click on cellbot.py to launch it
You should see a confirmation that the device is ready at this point to accept incoming telnet sessions on port 9002.
Tip: Be sure to run the "chmod 777 /dev/ttyMSM2" command from step #3 first. See step #5 for finding the phone's IP address.
Image Notes1. This is where the received commands get sent out the serial port
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Step 5: Telnet into the G1 and test sending it commandsThe phone should be ready for you to telnet into it and send it commands from your PC. It will print them to the phone's screen to confirm what it receives. I used PuTTYon Windows but we've confirmed that minicom works great on Macs as described in this instructable .
You will first need to find your phone's IP address. This is available by going to Menu > Settings > Wireless controls > Wi-Fi settings and then pressing the currentlyactive connection. A pop-up toast message will come up with the current IP address on the local network. Write this down as you'll use this every time you want to open atelnet session from your PC. IP assignments typically expire after a certain number of days so you may need to check this again.
Note: This tutorial assumes your PC and phone are on the same local network. Routing to the phone from outside of the local network should be possible butis not covered here.
Open your telnet client of choice and connect to the IP of the phone on port 9002. From a command line you do this as "telnet 192.168.1.1 9002" using the actual IP ofthe phone. Type in some characters and hit enter to see them show up on the phone's screen. You can type a q to cause the Python script to quit, which should closeyour terminal session.
If for any reason you can't connect via telnet and need to kill the program, a simple reboot of the phone should do the trick. Advanced users may want to find the processID via ps and then use kill to stop it.
Advanced: A future version of this could run a local web server from the phone rather than accepting commands via telnet. We're also exploring XMPP to chat with yourrobot.
Step 6: Connect a 3.3v to 5v level shifter to the ArduinoThe Arduino used in the this tutorial is a 5v model so we need to convert the 3.3v signal coming out of the G1 using a level shifter. It should be possible to connectdirectly to a 3.3v Arduino but that was not something I tested.
There are several ways to approach this but we'll use a 74LS04 chip in this example. You can search for one here and they are likely under $1. Tim and I picked ours upfrom the Hacker Dojo in Mountain View , CA but these are VERY common and should be plentiful wherever chips are sold or donated.
At a high level we're simply going to send the TX signal from the HTS USB breakout board into pin 1 of the 74LS04 chip. To make it work we go through the chip twiceand come out pin 4 to the RX pin on the Freeduino SB (your serial pin may be different if you have another Arduino board but all should support this).
Follow these steps to wire up the level shifter and connect the HTC USB board (do not plug it into the phone yet and unplug power to the Arduino):
1. Insert the 74LS04 chip onto your breadboard. Make sure the chip hurdles the center break so the pins aren't shorted (a dumb move I made at first)2. Soldier two wires to the HTC USB board as described in this instructable , but we'll only be using pins 7 (Ground) and 8 (TX0) since we're only doing one-way transmission for this tutorial.3. Connect the other end of the ground (pin 7) wire to a ground on your breadboard (which should be connected to a ground on your Arduino)4. Connect the other end of the TX0 (pin 8) wire to the breadboard where it runs into pin 1 of the 74LS04 chip. (do an image search for a full diagram of the chip)
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
5. Use a wire to connect pin 2 and 3 of the chip6. Connect pin 4 of the chip to the Arduino RX point (pin 0 on the Freeduino SB and Arduino Duemilanove)7. Connect pin 7 (GND) on the chip to the ground for your breadboard (which also connects to the Arduino ground)8. Connect pin 14 (VCC) to the 5v power on your breadboard (which gets the power from the Arduino 5v output)
You should now be ready to plug in the HTC USB break-out board into the bottom of the phone and power on the Arduino. Check for sparks and smells and touch thingsto make sure they are cool.
Note: The current cellbot code turns on LED #13 when the servo motors of the robot should be running. If you don't have a robot yet you can check to seethat the LED turns on and off to confirm it is working.
Image Notes1. Goes to nothing
Image Notes1. This goes to pin 8 on the HTC USB board2. Goes to pin 8 ground on HTC USB board3. 5v power to the Arduino is at the other end of the breadboard and not in thispicture4. 5v Power5. Jump pins 2 and 3 together6. Connects to the RX pin 0 on the Arduino7. Ground8. Connects to ground on the Arduino at the other end of the breadboard out ofthis picture
Image Notes1. These two are not used during this tutorial but I used them when testingserial to USB from the other linked instructable2. Pins 7 and 8 are used to connect to your breadboard
Image Notes1. Not used2. Used
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Image Notes1. Freeduino SB2. Breadboard3. HTC USB and phone off screen in this direction
Image Notes1. 5v power2. Ground3. Connects to pin 4 on 74LS04 chip4. Optional - connects to external LED but the onboard LED would suffice for thistutorial.5. I'm using external 9V power but you could use another voltage in the Arduino's7-12v range, or use power over USB (but that doesn't demonstrate the coolnessof being disconnected from the PC)6. USB plugged in during this picture but unplugged when fully running.
Image Notes1. The TX0 pin of the HTC USB board connects here2. Connect these two togther3. This does to the RX pin 0 on the Arduino4. Connect to ground5. Connect to the 5v power from the Arduino
Step 7: Load the Cellbots program on the ArduinoGet the Arduino source code from our Google Code project site . Open the Cellbots.pde Arduino program in the Arduino editor. Then push it to your Arduino board.
You can test talking to the Arduino code by opening the serial monitor in the Arduino editor. This is a great way to test your robot or device by talking directly to theArduino before hooking everything up to the phone. The code sends serial commands back to the serial monitor to confirm what it is doing even if you don't have yourrobot built yet.
Note: You can't load programs onto the Arduino while the wire is connected to the RX serial input pin. So you might want to put this one a switch but I simplyunplugged it when I needed to load a new program.
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Image Notes1. You should be able to control the LED from the Arduino serial monitor withouthaving the phone plugged in.
Image Notes1. Type commands in here to test sending ASCII characters over serial to theArduino
Step 8: Run the whole processYou should be able to connect the HTC USB board to the phone, fire up the cellbot.py file in ASE, and open a terminal sessions into the phone. Type "H" to have thephone say hello or any other commands from the README.txt file.
A "q" will quit the Python script on the phone and close the terminal socket.
Here is a recap of how it all works:1. The Python script opens a socket to accept incoming telnet connections and echo the commands out the serial port2. We connect from our PC to the phone via telnet on port 9002 and send it commands that we see on screen3. The HTS USB board interfaces with the G1's USB port and sends the 3.3v signal into the 74LS04 pin 1.4. The signal comes out of the chip on pin 2, goes back in on pin 3, and comes out again on pin 4 at 5v5. Our Arduino accepts the serial signal on RX pin 0 and process it via the Cellbot.pde program6. We can type 'q' to kill the Python script and close the telnet connection
Now that you've completed this very complicated process to send basic commands to an Arduino robot, it is time for you to hack it to be more awesome! We don't yethave 2-way serial working so the Arduino can't send commands back into the phone but we're working on that.
Stay current by subscribing to our blog at Cellbots.com .
About the Authors:
Tim HeathLead researcher who first put this process together at the Tech Shop in Menlo Park, where he is a member.
Ryan HickmanProgrammer who worked on the Python and Arduino code and authoered this Instructable.
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Image Notes1. Goes to nothing
Image Notes1. Use ddms from the Android SDK to take screen shots from your phone (amongother tricks)2. Use adb shell from the Android SDK to execute commands from the PC insteadof typing them into the phone.3. I used PuTTY on Windows to telnet into the phone.
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http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
Comments
20 comments Add Comment
mertaxoy says: Feb 5, 2011. 4:10 AM REPLYis it possible with HTC Wildfire. Wildfire has another USB break-out.. Can you please help me about this.,
rex358 says: Dec 14, 2010. 4:15 AM REPLYhey, can i run my camera app that i have built using the ecclipse , the same time when this appp on python is running....illl be glad if some body helps me onthis
Chowmix12 says: Dec 12, 2010. 7:56 PM REPLYFor the newer generations of android electronics (phones and tablets) including the Droid. They come with USB host already built in> Could i use the sameprograming cable for my arduino to connect to an android tablet? If i did, what app would i need to accomplish a serial port to the arduino?
Chow.
wareneutron says: Nov 26, 2010. 12:37 AM REPLYit not goes nothing?
radhoo says: Nov 1, 2010. 4:14 PM REPLYOne of my last projects was a 4x4 differential drone, built from scratch, remotely controlled via Bluetooth using an Android smartphone.Schematics / demo video here: http://www.pocketmagic.net/?p=1398Besides ultrasonic sensors, the robot is about to be equipped with a homemade geiger counter sensor to detect "exotic" environment parameterslike the dangerous ionizing radiation. There are quite a few possibilities since the robot has an ATmega microcontroller that can easilysupport additional sensors.The data is sent back to the Android device, via bluetooth.
carterson2 says: Jul 25, 2010. 7:23 PM REPLYCan I buy a kit?
wenjiun says: Apr 3, 2010. 5:58 AM REPLYYou can also choose the latest Super D 1.10.2 as well while older version 1.9.3 does not support the feature.
roadog says: Apr 2, 2010. 1:53 AM REPLYCOOL!I wanna try it!
christian2gothic says: Mar 27, 2010. 8:49 PM REPLYis it necessary for the phone on the bot to have service turned on??
are there ways to control the bot through satellite instead of using cellphone service. that way you wouldn't be dependent on a service.
Is there any way to bypass the use of cell phone towers all together???
mranalytical says: Mar 28, 2010. 6:28 PM REPLY We typically test with phones that have no SIM card and use wi-fi for local communications.
christian2gothic says: Mar 28, 2010. 7:51 PM REPLYwhat if you wanted the bot to travel across several states?
and i've been looking into flying bots, it's been hard to find anything here on instructables.
how hard is it to send live video and sound feed from the bot to your PC??
i'm trying to gather info for a different project i'm working on??
mranalytical says: Mar 30, 2010. 11:21 AM REPLY We just added XMPP support so as long as the phone has a data connection (any kind will do), you can command it from anywhere.
Feel free to start a thread here with ideas: http://groups.google.com/group/cellbots
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/
captFuture says: Jan 27, 2010. 7:43 AM REPLYThanks for this nice Tutorial - I can confirm that the latest kernels of Cyanogen have Serial enabled. (I'm personally using a HTC Magic - not a G1)
I did a bit of research as well and found out that Arduino sees 3,3V from the Phone as valid "high" state, so you would not need the 74LS04 in between forsending the data to the arduino.This is of course different in the other direction - there you have to reduce from 5V to 3,3V :)
Cheers
mranalytical says: Jan 28, 2010. 1:36 AM REPLYGreat find captFuture. I'll update the instructable to reflect that. Still trying to get two-way working but the issue isn't hardware so much as making anincoming serial socket using Python when pySerial isn't in ASE.
captFuture says: Jan 29, 2010. 3:39 AM REPLY Maybe it would be an option to do it in java - some guys are developing a serialport API for the SDK.
code.google.com/p/android-serialport-api/
rice103 says: Mar 1, 2010. 5:16 AM REPLY but you need the serialport dll..... can you send me?? i can't compile it!!! ([email protected])
mranalytical says: Mar 1, 2010. 9:06 AM REPLY You'll have to reach out to the Android Serialport API project team for the code they are using. My work has been using Python on Androidvia the Android Sripting Environment.
tim_programmer says: Jan 27, 2010. 5:49 AM REPLYGood to see someone else looking at this... I'm planning on interfacing to an AVR soon for a couple of projects soon (one is a universal IR remote - sendingserial commands to the AVR which flashes an IR LED... the other involves the USB host support on the AT90USB1287.. but that ones a secret ^_^)
Jorad says: Jan 26, 2010. 12:57 AM REPLY That is pretty awesome.... perhaps programming on the android to the arduino is on the horizon?
mranalytical says: Jan 26, 2010. 2:34 PM REPLY That could certainly be possible. If not programming on the phone it would certainly be nice to send new programs remotely to it instead of plugging it ineach time.
Glad you like the tutorial and hope you make something cool with it.