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by robotworkshop
Wed Dec 17, 2014 6:07 pm
Forum: Other projects
Topic: MagPi Issue 29
Replies: 1
Views: 3150

Re: MagPi Issue 29

Hello Will, Is MagPi still looking for new articles? I had sent one in back before issue 27 was delayed and haven't heard if anyone has even looked at it. What is the preferred method of submitting new content to the magazine? It would be nice to see a more formal writers guide that covers: - How to...
by robotworkshop
Thu Sep 25, 2014 3:49 pm
Forum: Other projects
Topic: MagPi Issue 27 : delayed
Replies: 23
Views: 8958

Re: MagPi Issue 27 : delayed

Hello Will, Although I may not be able to assist with the layout of the MagPi magazine I can help with content. I recently submitted a robotics related article to the MagPi for review. I hadn't head back from anyone if they wanted to use it in the magazine and I guess the recent loss of staff explai...
by robotworkshop
Tue Jan 08, 2013 7:55 pm
Forum: Other projects
Topic: Default text screen resolution for RCA composite display
Replies: 0
Views: 868

Default text screen resolution for RCA composite display

Does anyone happen to know what default text screen resolution is for the RCA composite display? All of the searches I've done only turn up some screen sizes in pixels but none seem to mention what the text dimensions are of the screen. Is it supposed to be 80x25 or something different? Besides the ...
by robotworkshop
Thu Dec 13, 2012 9:54 pm
Forum: Automation, sensing and robotics
Topic: Raspberry pi and Parallax Propellor
Replies: 34
Views: 10820

Re: Raspberry pi and Parallax Propellor

For an example on how to use serial communications on the Raspberry Pi you can review this thread: http://www.raspberry-projects.com/pi/programming-in-c/uart-serial-port/using-the-uart#more-482 /dev/ttyAMA0 will refer to the built-in console serial port available on the GPIO pins. If you have a Prop...
by robotworkshop
Tue Dec 04, 2012 6:09 pm
Forum: Automation, sensing and robotics
Topic: Raspberry pi and Parallax Propellor
Replies: 34
Views: 10820

Re: Raspberry pi and Parallax Propellor

I think you're looking at making the connection more complicated than it needs to be. You shouldn't need to deal with the GPIO at all. Instead just plug the Parallax Propeller into the USB port of the Raspberry Pi. Or, plug it into a powered USB HUB and then into the Raspberry Pi. Most of the Propel...
by robotworkshop
Fri Nov 30, 2012 3:32 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Interfacing Raspberry Pi with RTC and two Arduino's
Replies: 2
Views: 1668

Re: Interfacing Raspberry Pi with RTC and two Arduino's

Wiring up a hardware RTC clock chip isn't hard at all. I used a chip that runs at 3.3V so the wiring was easy. Here are some links about adding a clock. I've seen this topic come up several times and I wish one of those threads could be setup as a sticky so it stays near the top. http://www.raspberr...
by robotworkshop
Tue Oct 30, 2012 5:59 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Integrating DS3234 RTC
Replies: 1
Views: 3725

Re: Integrating DS3234 RTC

I used a DS3231SN chip with excellent results. It was mentioned in the Tutorial here: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=44&t=16218 If you get the Adadruit prototype board it has a spot where the DS3231SN chip can be easily mounted. The nice thing about the DS3231SN is that it has...
by robotworkshop
Fri Oct 12, 2012 5:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: system time not syncing from RTC
Replies: 2
Views: 8817

Re: system time not syncing from RTC

Checkout the end of this thread:

http://www.raspberrypi.org/phpBB3/viewt ... 44&t=16218

It should have the answer to your question about reading the RTC upon boot.
by robotworkshop
Thu Oct 11, 2012 5:13 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Help with RTC
Replies: 19
Views: 16277

Re: Help with RTC

There is a good tutorial on adding a RTC here:

http://www.raspberrypi.org/phpBB3/viewt ... 44&t=16218
by robotworkshop
Thu Oct 11, 2012 5:12 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 74HC595 Shift Register IC Vcc
Replies: 16
Views: 12940

Re: 74HC595 Shift Register IC Vcc

If you really need a higher current/voltage than the 74HC595 can provide and want to keep the chip count down you could look at the TI TPIC6595 chip. http://www.ti.com/lit/ds/symlink/tpic6595.pdf Instead of all that though you may find the 74HC595 works ok as it is. Instead of looking at ways to use...
by robotworkshop
Fri Oct 05, 2012 7:35 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Controlling a floppy disk with the GPIO
Replies: 11
Views: 6559

Re: Controlling a floppy disk with the GPIO

If you just want to control the movement of the drive (motor on/off, step head in/out) then you could probably do it using the GPIO. However since the GPIO is 3.3V and there isn't a lot of extra I/O pins available I would use another small microcontroller to control the drive and let the RP tell it ...
by robotworkshop
Tue Sep 25, 2012 7:58 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: driving two 3.3v motors
Replies: 13
Views: 2895

Re: driving two 3.3v motors

If you already have it working on an Arduino why not just leave it there and let the Arduino handle a lot of the other I/O as well. Can't you plug the USB connection from the Arduino into the RaspBerrry Pi USB port and then access the Arduino as a serial device? Just send higher level commands to th...
by robotworkshop
Tue Sep 25, 2012 5:38 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Tutorial: Add a Real Time Clock to the Raspberry Pi
Replies: 113
Views: 142634

Re: Tutorial: Add a Real Time Clock to the Raspberry Pi

Thank You! I'll try adding the package to Raspbian and see how it works out. Since it should be possible to use the same interface for other devices I was looking around to see what else was available. One of the sites I found was: http://www.i2cdevlib.com/ Seems like it has some useful information ...
by robotworkshop
Tue Sep 25, 2012 3:28 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Tutorial: Add a Real Time Clock to the Raspberry Pi
Replies: 113
Views: 142634

Re: Tutorial: Add a Real Time Clock to the Raspberry Pi

Thanks for the additional notes. I was doing all my testing on the command line after the Raspberry Pi was up. I'll try these steps to make it automatically use the time from the Real TIme Clock chip upon boot each time. It was nice to try the Occidentalis v0.2 image since that had all the packages ...
by robotworkshop
Mon Sep 24, 2012 1:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Tutorial: Add a Real Time Clock to the Raspberry Pi
Replies: 113
Views: 142634

Re: Tutorial: Add a Real Time Clock to the Raspberry Pi

This is an excellent write up on how to add a hardware clock to the Raspberry Pi. I built a similar circuit on a protoboard using the DS3231SN chip and it works great. In order to set the time on the RP from the hardware clock I had to use the command: sudo hwclock -s Maybe that command should be ad...
by robotworkshop
Sun Sep 23, 2012 4:08 am
Forum: Troubleshooting
Topic: Any way to try and re-flash a dead Pi?
Replies: 9
Views: 1661

Re: Any way to try and re-flash a dead Pi?

It sounds like the Broadcom chip must come hardwired with enough embedded smarts to boot from an SD card. I'm just trying to get a good understanding on how the board is supposed to work and the boot sequence. Looks like this one particular board may not come back.
by robotworkshop
Sat Sep 22, 2012 7:59 pm
Forum: Troubleshooting
Topic: Any way to try and re-flash a dead Pi?
Replies: 9
Views: 1661

Re: Any way to try and re-flash a dead Pi?

Are you sure about no flash on the broadcom chip? If there is no flash then is the low level boot code built into those chips from the start? I'm used to other controllers where a small amount of firmware would be flashed on the chip, at least enough to tell the chip how to start booting and how to ...
by robotworkshop
Sat Sep 22, 2012 2:29 pm
Forum: Troubleshooting
Topic: Any way to try and re-flash a dead Pi?
Replies: 9
Views: 1661

Re: Any way to try and re-flash a dead Pi?

I've tried using a newly imaged SD card but that didn't seem to help. I know the SD card was ok since I then took the same card and tried it in my Raspberry Pi and it booted. I've read that the firmware can be updated but all the references seemed to mention that it was done while or after booting f...
by robotworkshop
Sat Sep 22, 2012 2:05 pm
Forum: Troubleshooting
Topic: Any way to try and re-flash a dead Pi?
Replies: 9
Views: 1661

Any way to try and re-flash a dead Pi?

So far I have had a great experience with the Raspberry Pi and my own board is running well. One of my best friends is having trouble with one of his Raspberry Pi boards and asked me to take a look at it. The board had been running fine and one day just quit working. I'm sure someone will ask so I'l...
by robotworkshop
Fri Sep 14, 2012 10:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using the GPIO Serial port ttyAMA0
Replies: 10
Views: 66460

Re: Using the GPIO Serial port ttyAMA0

Using all the suggestions I was able to confirm the port is working and I can send and receive data at 9600 baud via the command line. I still need to look into the XON/XOFF for handshaking but this really helps me get started.

Thank You,

Robert
by robotworkshop
Fri Sep 14, 2012 3:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using the GPIO Serial port ttyAMA0
Replies: 10
Views: 66460

Re: Using the GPIO Serial port ttyAMA0

That link is very helpful. Thank You!! One tip I saw there was how to send the carriage return and linefeed from the command lie: echo "hello" > /dev/ttyAMA0 To send with a carriage return and line feed: echo -e "hello \r\n" > /dev/ttyAMA0 Also, thanks for the note about the stty...
by robotworkshop
Fri Sep 14, 2012 3:38 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using the GPIO Serial port ttyAMA0
Replies: 10
Views: 66460

Re: Using the GPIO Serial port ttyAMA0

I found the answer to the question about minicom here:

http://codeandlife.com/2012/07/29/ardui ... unication/

It looks like I just need to install that package. I'm going to give that a try this evening.
by robotworkshop
Fri Sep 14, 2012 3:28 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using the GPIO Serial port ttyAMA0
Replies: 10
Views: 66460

Using the GPIO Serial port ttyAMA0

I have a couple (hopefully quick) questions about using the onboard serial port on the GPIO connector on the RP. I've already built a small adapter with a MAX3232 chip so I have the RX and TX using proper RS-232 voltage levels to connect to my device. Now that it is connected I need to start using i...
by robotworkshop
Tue Sep 11, 2012 6:30 pm
Forum: Automation, sensing and robotics
Topic: Retrofitting Pi into my previous robot
Replies: 1
Views: 1282

Re: Retrofitting Pi into my previous robot

I'm in the process of upgrading on of my Propeller based robots as well. The Raspberry Pi will do all the higher level thinking and I'm off loading the motor control and all the low level I/O for the sensors to a couple of Propeller boards. The Propeller is ideal for dealing with the sensors. They m...

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