Re: New install


David Cameron - IRLP
 

It should be 0v when the logic pin is low. 3.3v is the high state. 

Dave Cameron 

-------- Original message --------
From: Craig - K1BDX - Node 8724 <k1bdx.craig@...>
Date: 12/22/19 1:08 PM (GMT-08:00)
To: IRLP@irlp.groups.io
Subject: Re: [IRLP] New install

That voltage is not changing in a significant way

If the initial voltage is high (around 3.26 volts)  then the
"asserted" voltage (low) should be down around 1 volt or less.


On 12/22/19, William Phillips <bphillips.nnh@...> wrote:
>
> That pin varies between 3.26 to 3.29 when dtmf tone sent. I checked it on
> the pi as well as the irlp board it was the same on both ends.
>>
>>
>> On Dec 22, 2019, at 6:22 AM, Craig - K1BDX - Node 8724
>> <k1bdx.craig@...> wrote:
>>
>> The first binary bit  D0 seems to be stuck in the "asserted" condition.
>>
>> I'm wondering if the wire between the pi and the irlp interface board is
>> broken
>>
>> According to Dave Cameron's diagram
>>
>> D0 is pin number 7 or the Raspberry Pi header
>>
>> monitor the voltage on that pin while you send tones and see if it
>> changes state properly
>>
>>
>>> On 12/22/19, William Phillips <bphillips.nnh@...> wrote:
>>>
>>> Well I tried a different raspberry 4 did an install all works except the
>>> dtmf tones are incorrect and the same as before
>>>
>>> Pressed : Seen
>>> 1:nothing
>>> 2:3 when released 1
>>> 3:3 when released 1
>>> 4:5 when released 1
>>> 5:5 when released 1
>>> 6:7 when released 1
>>> 7:7 when released 1
>>> 8:9 when released 1
>>> 9:9 when released 1
>>


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