[OpenTRV-dev] OT: replacement of danish char's inside a word

[Bo Herrmannsen]

5V?

where did you get that from?

but yes base to the gpio pin through a 1K resistor

emitter to 3.3V and collector to buzzer positive and the other side to GND


but why could i not connect emitter to 5v? not that i plan to but just curious


Den 19/03/2014 kl. 21.56 skrev Adrian Godwin:

> Yes, but you can't use 5V like that with a PNP. You'll need to connect the transistor emitter to 3v3, the collector to the buzzer, and the other ed of the buzzer to gnd.  The buzzer will operate when the pin is low.
> 
> 
> 
> On Wed, Mar 19, 2014 at 7:37 PM, Bo Herrmannsen <EMAIL ADDRESS HIDDEN> wrote:
> so with a transsistor i should be ok
> 
> http://www.susa.net/wordpress/wp-content/uploads/2012/06/Relay-Sample.png
> 
> this uses a NPN but am i correct i just place the buzzer at the buttom when i have a PNP ?
> 
> 
> Den 19/03/2014 kl. 20.09 skrev Adrian Godwin:
> 
>> I wouldn't. That buzzer takes 30mA and the pi pins are rated at 16mA.
>> 
>> 
>> 
>> On Wed, Mar 19, 2014 at 6:52 PM, Bo Herrmannsen <EMAIL ADDRESS HIDDEN> wrote:
>> I have seen guides where they attached one direct...
>> 
>> but of course a 3V one is needed... 
>> 
>> http://www.tandyonline.co.uk/miniature-3-3v-pcb-buzzer.html
>> 
>> 
>> 
>> Den 19/03/2014 kl. 19.17 skrev Adrian Godwin:
>> 
>>> A GPIO pin won't drive a buzzer. Needs a transistor at least. 
>>> 
>>> 
>>> On Wed, Mar 19, 2014 at 5:34 PM, Bo Herrmannsen <EMAIL ADDRESS HIDDEN> wrote:
>>> yeah....
>>> 
>>> a buzzer with 2 terminals cant be more simple... one terminal to gnd and one to a GPIO pin... ie pin 15 or GPIO 22
>>> 
>>> 
>>> Den 19/03/2014 kl. 18.30 skrev Stuart Poulton:
>>> 
>>>> I going with the keep it simple approach.
>>>> 
>>>> On 19 Mar 2014 17:25, "Bo Herrmannsen" <EMAIL ADDRESS HIDDEN> wrote:
>>>> to big.... it will not fit... its the buzzer only i need
>>>> 
>>>> 
>>>> Den 19/03/2014 kl. 17.50 skrev Stuart Poulton:
>>>> 
>>>>> How about this
>>>>> 
>>>>> http://shop.pimoroni.com/products/pibrella
>>>>> 
>>>>> On 19 Mar 2014 14:32, "Bo Herrmannsen" <EMAIL ADDRESS HIDDEN> wrote:
>>>>> Figured it....
>>>>> 
>>>>> Now where do i find a buzzer for 3.3V that does not overload the Ras Pi's GPIO pins?
>>>>> 
>>>>> 
>>>>> 
>>>>> Den 18/03/2014 kl. 14.14 skrev Bo Herrmannsen:
>>>>> 
>>>>> > Hi
>>>>> >
>>>>> > anyone that can help me out with php?
>>>>> >
>>>>> >
>>>>> > i need to replace some special danish char's with something else. This should happen no matter where they pop up.
>>>>> >
>>>>> >
>>>>> > $string = $row['delivery_street_address'];
>>>>> >
>>>>> > $patterns = array();
>>>>> > $patterns[0] = '*å*';
>>>>> > $patterns[1] = '*æ*';
>>>>> > $patterns[2] = '*ø*';
>>>>> >
>>>>> >
>>>>> > $replacements = array();
>>>>> > $replacements[3] = '/x7D';
>>>>> > $replacements[2] = 'X';
>>>>> > $replacements[1] = '/x7C';
>>>>> >
>>>>> > echo preg_replace($patterns, $replacements, $string);
>>>>> >
>>>>> >
>>>>> >
>>>>> > the address in this case is: Sandkæret 1,1,1
>>>>> >
>>>>> > but these 3 letters can pop up anywhere in any numbers
>>>>> >
>>>>> > all help is welcome :-D
>>>>> >
>>>>> >
>>>>> 
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