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by PiGraham
Fri Jun 22, 2018 6:24 pm
Forum: General discussion
Topic: Daylight viewable 5" screen for Pi?
Replies: 10
Views: 416

Re: Daylight viewable 5" screen for Pi?

Well, my thought was that current consumption increases with screen size. I did look at the Pi 7" screen, but have not seen it IRL. I have heard that it has a very low brightness though, but I have not seen any firm figures on cd/m2 for the "7 pi I have mailed comfile asking details of power draw. ...
by PiGraham
Thu Jun 21, 2018 5:07 pm
Forum: General discussion
Topic: Daylight viewable 5" screen for Pi?
Replies: 10
Views: 416

Re: Daylight viewable 5" screen for Pi?

Could you use a Kindle?Daylight readable but slow refresh.


These videos suggest possibilities but lack relevant details.

https://www.youtube.com/watch?v=TliNY5a7X4M

https://www.youtube.com/watch?v=gh-DIcZ6BA4
by PiGraham
Thu Jun 21, 2018 4:54 pm
Forum: Windows 10 for IoT
Topic: How to find the IP of Pi 3 without monitor
Replies: 14
Views: 620

Re: How to find the IP of Pi 3 without monitor

I have flashed windows 10 iot core on Micro SD card. I don't have monitor. You don't have a TV either, or know someone who has one you can use for 10 minutes? You would make things easier for yourself if you temporarily connect the Pi to a display so you can verify it is booting. If your router is ...
by PiGraham
Thu Jun 21, 2018 4:49 pm
Forum: Troubleshooting
Topic: how can I control 6 dc motors with pi zero
Replies: 6
Views: 190

Re: how can I control 6 dc motors with pi zero

hi guys thanks you all for the response. I have pi zero , L298N and 5V dc motors. I used pyhton curses to try it. I would like to control 6 dc motors with using keyboard. how could I use the buttons on the keyboard to control 6 motors ( turn forward and backward)? thanks again Try it! Have you trie...
by PiGraham
Thu Jun 21, 2018 3:15 pm
Forum: Windows 10 for IoT
Topic: How to find the IP of Pi 3 without monitor
Replies: 14
Views: 620

Re: How to find the IP of Pi 3 without monitor

Check your router DHCP server. It will list what devices it has assigned IP addresses to. Use an IP scanner, I've used AngryIP scanner. They ping a range of addresses and report which addresses respond. At worst that should give you a small number of addresses to try. If you have another machine tha...
by PiGraham
Thu Jun 21, 2018 2:47 pm
Forum: Troubleshooting
Topic: how can I control 6 dc motors with pi zero
Replies: 6
Views: 190

Re: how can I control 6 dc motors with pi zero

Controlling 6 motors is no problem and good pointers have been given. If you want advice on what hardware to use to control them it depends on what the properties of the motors might be. What voltage and current do they need? Do you need to drive them in both directions at controlled speed or just o...
by PiGraham
Mon Jun 18, 2018 8:27 am
Forum: Troubleshooting
Topic: Wrong screen resolution of Raspbian in VNC Viewer
Replies: 5
Views: 193

Re: Wrong screen resolution of Raspbian in VNC Viewer

I think Real VNC default is to show the native desktop resolution and that changes if you don't have HDMI display attached because the Pi uses analog ideo out if no HDMI. If that is your issue you can fix the display to always use HDMI (force_hotplug=1 in config.txt IIRC) You can force a resolution ...
by PiGraham
Fri Jun 15, 2018 6:15 pm
Forum: Python
Topic: Pi controlled RC car
Replies: 5
Views: 399

Re: Pi controlled RC car

I suggest you do not connect the Pi 5V to the battery positive / motor terminals. Power the Pi from a separate power source such as USB power bank. That protects the Pi from fluctuations of low and high voltage due to battery discharge, motor load high voltages due to "back emf" that can occur when ...
by PiGraham
Fri Jun 15, 2018 6:05 pm
Forum: Python
Topic: Pi controlled RC car
Replies: 5
Views: 399

Re: Pi controlled RC car

Hi, thank you for the answer. About the wiring: since I'm a newbie to the breadboard wiring (and also a newbie to RasPi in general), can I ask you to explain in a very basic way what "ground rail of the breadboard" means? About the photos: I just thought the were useless since they would be identic...
by PiGraham
Fri Jun 15, 2018 1:44 pm
Forum: Beginners
Topic: How to stop multiple detection of button press?
Replies: 8
Views: 255

Re: How to stop multiple detection of button press?

Your code is only testing the current state. If you want one action when the button is presed to need to detect when the input changes state . input = GPIO.input(23) if input == True: print "email sent" The above will kep printing "email sent" over and over as long as the button is pressed. You can ...
by PiGraham
Fri Jun 15, 2018 11:04 am
Forum: Beginners
Topic: How to stop multiple detection of button press?
Replies: 8
Views: 255

Re: How to stop multiple detection?

If you record the time when a keypress occurs you can check how long it has been when the next keypress occurs. If it's too soon just ignore itelse just update the time
by PiGraham
Mon Jun 11, 2018 7:53 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi communication over radio
Replies: 5
Views: 473

Re: Raspberry Pi communication over radio

A radio antenna above ground works much better than one on the ground. If you put GPS on the rocket and transmit position during descent that may help finding the rocket on the ground more than the radio after touchdown. You could also try using a directional antenna (e.g. Yagi, parabolic) to get a ...
by PiGraham
Mon Jun 11, 2018 2:57 pm
Forum: Other projects
Topic: Is possible with Raspberry 3 emulate USB or PS/2 keyboard?
Replies: 2
Views: 357

Re: Is possible with Raspberry 3 emulate USB or PS/2 keyboard?

You can probably do PS/2 on gpio but USB would need gadget mode which is only available on PiZero (maybe Pi A/A+)
by PiGraham
Mon Jun 11, 2018 2:55 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi communication over radio
Replies: 5
Views: 473

Re: Raspberry Pi communication over radio

You could use something basic like a 433MHz keyfob remote https://uk.rs-online.com/web/p/products/8430812/?grossPrice=Y&cm_mmc=UK-PLA-DS3A-_-google-_-PLA_UK_EN_Semiconductors-_-Semiconductor_Development_Kits%7CRadio_Frequency_Development_Kits-_-PRODUCT+GROUP&matchtype=&gclid=Cj0KCQjwu_jYBRD8ARIsAC3E...
by PiGraham
Mon Jun 11, 2018 2:37 pm
Forum: Camera board
Topic: Night-vision camera taking day-vision pictures
Replies: 4
Views: 331

Re: Night-vision camera taking day-vision pictures

This probably isn't the best place to ask about third-party add-ons.

How are you powering the IR LEDS?

How is the integrated IR cut filter controlled? If that switches in you will block the light from the LEDs
by PiGraham
Mon Jun 11, 2018 10:13 am
Forum: Networking and servers
Topic: Remote Access to PI behind any network
Replies: 12
Views: 744

Re: Remote Access to PI behind any network

The main problem is this: Even though the PI will be connected to WIFI at this facility, the network port of the PI will have a device connected to it which I need to program remotely. The programming software can't run on the PI. So, essentially, the PI will be used as a WIFI Bridge for this parti...
by PiGraham
Sun Jun 10, 2018 9:08 pm
Forum: Networking and servers
Topic: Remote Access to PI behind any network
Replies: 12
Views: 744

Re: Remote Access to PI behind any network

I think you can run Team Viewer on Pi and that works well to allow access into a network without configuration. AFAIK bothe ends must have internet access to TeamViewer's servers to make contact though.

See also "reverse VNC" and "reverse SSH tunnel"
by PiGraham
Wed Jun 06, 2018 3:47 pm
Forum: Python
Topic: Read multiple numbers from 4x4 keypad
Replies: 11
Views: 324

Re: Read multiple numbers from 4x4 keypad

Thanks scotty101
by PiGraham
Wed Jun 06, 2018 3:09 pm
Forum: Python
Topic: Read multiple numbers from 4x4 keypad
Replies: 11
Views: 324

Re: Read multiple numbers from 4x4 keypad

If you want to read a number of digits just add to a string on each keypress event. If you are using the eample ode it just prints the current key. def printKey(key): print(key) # printKey will be called each time a keypad button is pressed keypad.registerKeyPressHandler(printKey) If you define a gl...
by PiGraham
Tue Jun 05, 2018 5:59 pm
Forum: General discussion
Topic: Tranquility Project
Replies: 61
Views: 1883

Re: Tranquility Project

bensimmo wrote:
Tue Jun 05, 2018 4:14 pm
We got 1km up with our rocket, does that count? (and a school).
I'd count that as a great success, so long as you weren't expecting to reach the moon.
Well done!
by PiGraham
Tue Jun 05, 2018 2:25 pm
Forum: Beginners
Topic: SMS without internet
Replies: 2
Views: 111

Re: SMS without internet

If you are lucky you might find you are in a location covered by LoRaWAN https://lora-alliance.org/ In which case you could use a LoRa radio module to talk to a local gateway to connect to SMS or Internet. Shop around for celular deals. Pare down your data to send a few SMS as possible. Can you only...
by PiGraham
Tue Jun 05, 2018 12:47 pm
Forum: General discussion
Topic: Tranquility Project
Replies: 61
Views: 1883

Re: Tranquility Project

jamesh wrote:
Tue Jun 05, 2018 12:29 pm
And no school has a titanium printer!
Indeed. And nobody else has a rocket fuel printer.

It's great to pusue a dream, but it takes focus on the how to make it a reality. Otherwise it's pie in the sky rather than Pi on the moon.
by PiGraham
Tue Jun 05, 2018 12:42 pm
Forum: General discussion
Topic: Tranquility Project
Replies: 61
Views: 1883

Re: Tranquility Project

Wow this is new? https://www.wired.com/story/darpas-little-launch-challenge/?mbid=social_fb_onsiteshare https://www.darpalaunchchallenge.org/ Wonder if Dave Ackerman is up for the challenge? Launch a rocket from one of his balloons? I'll get excited about that once someone gets anywhere close to an...
by PiGraham
Tue Jun 05, 2018 12:28 pm
Forum: General discussion
Topic: Tranquility Project
Replies: 61
Views: 1883

Re: Tranquility Project

Most of this stuff has been figured out, including getting stuff down to the Moon's surface. http://www.tethers.com/EDTethers.html Thanks to the Internet all those old papers are now available, I can now read them to make sure I'm not talking s... ;) But now it no longer needs any Country's space a...
by PiGraham
Tue Jun 05, 2018 11:28 am
Forum: General discussion
Topic: Tranquility Project
Replies: 61
Views: 1883

Re: Tranquility Project

Gavinmc42 wrote:
Tue Jun 05, 2018 11:08 am

The bolo is slower so junk comes to it ;)
But you have to catch hold of it and equalise velocity or else it will fly right by. You need a big net, a way to bind the junk into a reasonably rigid structure and propulsion to maintain orbit in the right place to collect junk.

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