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by riccardo_r
Tue Sep 18, 2018 9:11 pm
Forum: Italiano
Topic: Direct Connect tra Raspberry e Smartphone
Replies: 5
Views: 2789

Re: Direct Connect tra Raspberry e Smartphone

In realtà un Android non si accontenta di connettersi al Raspberry e basta. Se si accorge di non poter andare su Internet, ti mette una bella croce sulla connessione

Image

e da lì in poi fa un sacco di capricci.
by riccardo_r
Sat Mar 16, 2013 4:26 pm
Forum: HATs and other add-ons
Topic: Connecting to a 5V Relay Switch
Replies: 9
Views: 6821

Re: Connecting to a 5V Relay Switch

the GPIO, when goes high (3.3v), polarizes the transistor so it pulls to ground the relay....
by riccardo_r
Sat Mar 16, 2013 10:24 am
Forum: Python
Topic: Opening serial will output "something"
Replies: 6
Views: 1329

Re: Opening serial will output "something"

yes, sure... I will do as you suggested. But it is still a mysterious thing... (and I hate mysterious things )

thank you
by riccardo_r
Sat Mar 16, 2013 9:56 am
Forum: HATs and other add-ons
Topic: Connecting to a 5V Relay Switch
Replies: 9
Views: 6821

Re: Connecting to a 5V Relay Switch

Hello,
put a simple NPN transistor to drive the relay:
Image

No matter the voltage that you'll use to power the relay (in a reasonable range, obviously).
by riccardo_r
Sat Mar 16, 2013 9:39 am
Forum: Python
Topic: Opening serial will output "something"
Replies: 6
Views: 1329

Opening serial will output "something"

Hello, I was wondering if anyone has notice a strange behavior on serial tx pin (GPIO14). Every time I open the serial port from a Python code, s=serial.Serial(port,baud,timeout=1) I can see a char on the tx pin (TTL level) http://s22.postimage.org/64hg6qn0h/serial_pi_py.jpg but I don't know if it i...
by riccardo_r
Fri Feb 08, 2013 9:55 pm
Forum: Italiano
Topic: Convertitore HDMI-VGA attivo più economico?
Replies: 2
Views: 3703

Re: Convertitore HDMI-VGA attivo più economico?

...in effetti [anonymous]* ne chiedeva uno che non fosse autoalimentato... questi invece lo sono...

*this post has been edited by Raspberry Pi Forums to remove the personal data of another user at the request of that user.
by riccardo_r
Fri Feb 08, 2013 1:57 pm
Forum: Italiano
Topic: Convertitore HDMI-VGA attivo più economico?
Replies: 2
Views: 3703

Re: Convertitore HDMI-VGA attivo più economico?

Ciao
secondo me uno dei più economici è questo
http://www.adafruit.com/products/1151

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