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by johndough
Sat Jul 12, 2014 9:12 am
Forum: Beginners
Topic: Controlling motor with pi
Replies: 23
Views: 3048

Re: Controlling motor with pi

Hi Many years ago I designed and built control panels that had a DC brake mechanism attached to an AC motor. A rectifier unit like this would be used...reissmann.com/en/produkte/elektronische-geraetetechnik/bremsgleichrichter/bremsgleichrichter.php However I built my own to save a few pounds and fou...
by johndough
Fri Jul 11, 2014 8:27 am
Forum: Other projects
Topic: Getting a small screen to work on my pi
Replies: 7
Views: 1609

Re: Getting a small screen to work on my pi

btw the pins are for the scvreen as as follows: 1-RST – Reset 2-CE – Chip Enable 3-DC – Data/Command 4-DIN – Serial Input 5-CLK – Clock Input 6-VCC – Power 7-BL – LED Backlight 8-GND – Ground Hiya This looks similar https://learn.adafruit.com/nokia-5110-3310-monochrome-lcd and may help. As you say ...
by johndough
Wed Jul 09, 2014 11:10 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Interfacing 24v Gate Controlboard
Replies: 12
Views: 3284

Re: Interfacing 24v Gate Controlboard

Using a optoisolator would be awesome of course so i measured everything you told me: 1) 22.5V ... should be OK!? 2) 1.25mA ... this is problematic for the 4N28 i guess? But i also have a bunch of 4N35 and according to the datasheet those have a CTR of 100, right? so those should work? 3) Using a 1...
by johndough
Wed Jul 09, 2014 10:27 am
Forum: Troubleshooting
Topic: networking question - oddities
Replies: 7
Views: 1224

Re: networking question - oddities

Basic network cable testers aren't designed to run through a switch. They just test from one end of a cable to the other. If the cable is showing that pin 6 is not connected then it is faulty. A standard 100 Mb connection only uses pins 1, 2, 3 and 6, so if 6 is faulty it won't work. A 1000 Mb conne...
by johndough
Tue Jul 08, 2014 1:34 pm
Forum: Beginners
Topic: NOOB SD Card Questions
Replies: 18
Views: 1697

Re: NOOB SD Card Questions

Hi You say VGA, is that a 15 pin or a flat pin DVI? HDMI2DVi.PNG either way I use a cable from the pound shop (HDMI) and buy the appropriate adapter from CPC Farnell RPI HDMI/DVI ADAPTOR (AV16125) - ADAPTOR HDMI TO DVI-D PLUG PRO SIGNAL - PSG91087 - DONGLE, HDMI-VGA, PRO-SIGNAL then I can connect to...
by johndough
Fri Jun 27, 2014 9:17 am
Forum: Other projects
Topic: MSI EEPROM Programmer
Replies: 1
Views: 1461

Re: MSI EEPROM Programmer

Hiya

There is a discussion thread on

Writing and Reading From ATmega EEPROM
http://www.raspberrypi.org/forums/viewt ... om#p552397

which might give a starting point.
by johndough
Tue Jun 24, 2014 12:56 pm
Forum: Beginners
Topic: Using windows software
Replies: 28
Views: 4385

Re: Using windows software

IBPCapture what's this? couldn't find anything linux related about this Hi I found it as suitable for mac. If it is, then linux is generally Posix compliant as is some apple stuff, therefore there is a good chance it will work. ########################## Fully POSIX-compliant Some versions of the f...
by johndough
Tue Jun 24, 2014 6:49 am
Forum: Beginners
Topic: Using windows software
Replies: 28
Views: 4385

Re: Using windows software

IBPCapture
by johndough
Sun Jun 22, 2014 9:51 am
Forum: Advanced users
Topic: raspi and sd card recovery
Replies: 19
Views: 8745

Re: raspi and sd card recovery

Hi

Windows XP can view limited amount of stuff, DiskInternals claim recovery.

I would actually use linux, OPENSUSE is my preference.
sdcard view.PNG
sdcard view.PNG (61.65 KiB) Viewed 8666 times
by johndough
Sun Jun 22, 2014 9:29 am
Forum: C/C++
Topic: Halp! This project is way over my head!
Replies: 5
Views: 1272

Re: Halp! This project is way over my head!

Hi The pinouts for keyboard and mouse are Pin Keyboard Dir Description 1 DATA Key Data 2 n/c or DATA2 for dual PS2 - Not connected 3 GND Gnd 4 VCC Power , +5 VDC 5 CLK Clock 6 n/c or CLK2 for dual PS2 - Not connected Pin Mouse Dir Description 1 DATA Key Data 2 n/c - Not connected 3 GND Gnd 4 VCC Pow...
by johndough
Thu Jun 19, 2014 4:11 pm
Forum: Off topic discussion
Topic: DEC VT05
Replies: 21
Views: 3658

Re: DEC VT05

So, I can neither afford nor find a DEC VT05 terminal anywhere - Is there any way that I can recreate one, using 3d printing (printing small parts & connectors, then putting them together), moulding, or something else similar? All that I really want is the case, the CRT display & the keyboard can b...
by johndough
Thu Jun 19, 2014 4:04 pm
Forum: General discussion
Topic: Raspian like Distro but for PC's
Replies: 8
Views: 2869

Re: Raspian like Distro but for PC's

Hi Hope this helps... Obviously http://distrowatch.com/ has hundreds of Linux distros to choose from Consider Edubuntu UKnow4Kids http://www.linuxschools.com/ Qimo Sugar www.sugarlabs.org/ Ubermix www.ubermix.org/ Qimo because it can be run 'live' to see if it is suitable, and is pretty light on nee...
by johndough
Sun Jun 15, 2014 9:15 am
Forum: Troubleshooting
Topic: Help, or I'm Done!
Replies: 8
Views: 1534

Re: Help, or I'm Done!

Hiya I wonder if the operating system was put onto USB stick or HDD, leaving only the BIOS equivalent on the SD card. The swap area may be a problem. This is covered in the forum somewhere. Also consider a heatsink on the processor, even though it doen't use one. Is the CPU area hotter than you feel...
by johndough
Sat Jun 14, 2014 8:59 am
Forum: Automation, sensing and robotics
Topic: Motors
Replies: 15
Views: 3995

Re: Motors

Hey all, I have had great success with this forum so far on all my projects, and it occurred to me today that my Pi could control the blinds in my workshop, thanks a lot guys! Hi Well Chivas Regal had large manual fire doors, and to wind them up took hours. So they duplicated the driving mechanism ...
by johndough
Fri Jun 06, 2014 9:58 am
Forum: General discussion
Topic: 24 VAC electrovalve
Replies: 4
Views: 1646

Re: 24 VAC electrovalve

Hi again, i´m sorry that i didn´t reply yet, but as i´m doing this in part time project i had not yet time to read awsers before. At this moment i´ve got: 1. Power supply 24vdc 2. Relay (http://www.opto22.com/site/pr_details.a ... em=MP240D4) 3. ElectroValve RainBird (JTV) http://rainbird.com/homeo...
by johndough
Wed Jun 04, 2014 9:38 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Controlling Relay Switch using GPIO
Replies: 28
Views: 7992

Re: Controlling Relay Switch using GPIO

Pull in requires upto 8 times the hold in, so to pull in and hold I would think that the power needed would be 3.6 watts or 600 milli-amps. #### So..................... Where did those numbers come from? From the data sheet the coil power is 0.36W @ 6V. 6V on the 100 Ohm coil would be 60mA (0.36W) ...
by johndough
Mon Jun 02, 2014 9:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Controlling Relay Switch using GPIO
Replies: 28
Views: 7992

Re: Controlling Relay Switch using GPIO

No :/ I tried swapping them and started the Pi again and the LED didn't turn on.I have a strong feeling there's something wrong with the relay. Once I get a multimeter what could I do to test it? Hi First off it states that the thing has to be soldered together. Secondly it states that it requires ...
by johndough
Sat May 31, 2014 8:45 am
Forum: Automation, sensing and robotics
Topic: Motors
Replies: 15
Views: 3995

Re: Motors

I just used google to see what you would get ;-) ... some are well expensive!!! .... I meant one like this https://www.egr.msu.edu/eceshop/Parts_Inventory/images/spdt%20limit%20switch.jpg Maplin or RS do them. I'm thinking of a switch that gets activated when something presses against it i.e. the b...
by johndough
Fri May 30, 2014 8:32 am
Forum: Python
Topic: Automating Multiple Valves...
Replies: 18
Views: 3095

Re: Automating Multiple Valves...

Okay I just don't have the time to work this out right now and so I am offering to pay for someone to fully write this script for me so that I can just load it onto the pi and get it working. I don't know if this is allowed here but I figured I would at least ask. If you want to write this script f...
by johndough
Thu May 29, 2014 9:39 am
Forum: Troubleshooting
Topic: How many motors can be hooked up on Raspberry Pi?
Replies: 10
Views: 1328

Re: How many motors can be hooked up on Raspberry Pi?

You need three Pi GPIO's per motor, using the driver from that photo. So with four motors, that's 12 GPIO's. For each motor, use PWM for its enable line, and use its direction pins to set /forward/reverse/break Enable A, IN1, IN2 is for motor A Enable B, IN2, IN3 is for motor B You must drive the m...
by johndough
Thu May 29, 2014 9:27 am
Forum: General discussion
Topic: 24 VAC electrovalve
Replies: 4
Views: 1646

Re: 24 VAC electrovalve

Hi, i would like to connect a 24 VAC electrovalve to the raspberry. I saw some pages on the web, but it´s not very clear for me. Rasperry is 5v (dc) Electro Valve is 24vac I have a Relay so that i can connect a GPIO from the raspberry and turn that valve on. For that what i understand, at this poin...
by johndough
Wed May 28, 2014 10:25 am
Forum: General discussion
Topic: An idea for a light switch.
Replies: 11
Views: 1616

Re: An idea for a light switch.

Hi, I had an idea where I would take my light switch apart and attach my raspberry pi up to it using the gpio pins. I thought it would be awesome because then I could use SSH to control my light wirelessly. However I am not very good at circuitry and cannot think of a way of making a switch that I ...
by johndough
Mon May 26, 2014 10:38 am
Forum: Advanced users
Topic: Atonomous boat
Replies: 3
Views: 880

Re: Atonomous boat

Hello, What are your suggestions for systems to an autonomous boat thats going to cross the sea outside my town all by itself? The distance is around 7,5 nautical miles(international). What do you suggest integrating into the build? So far ive decided what powerplant and boat i am going to use, and...
by johndough
Mon May 26, 2014 10:35 am
Forum: General discussion
Topic: start up
Replies: 7
Views: 1224

Re: start up

Hi I have just bought a raspberry pi starter kit and have connected everything to my television to set up the os. When I try to use one of the os it says that there is not enough memory to download or start. am I doing something wrong as the SD card is 4GB and should have more than enough memory sp...
by johndough
Sat May 24, 2014 11:43 am
Forum: General discussion
Topic: Solid State Relay advice.
Replies: 3
Views: 1456

Re: Solid State Relay advice.

Hi, Just registered and am looking some advice re SSR. I have the sainsmart 8 channel relay at the minute and it works well. Is there an equivalent Solid State Relay as I need one that will work silently? http://www.sainsmart.com/8-channel-dc-5v-relay-module-for-arduino-pic-arm-dsp-avr-msp430-ttl-l...

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