Haking the newer Harbor Freight Driveway Sensor

  I want to hack the newer Driveway sensor.
I had the old ones all figured out, now they went to all surface mount 
parts, with a different design.
   I just want to a add a button to trigger the peizo alarm in the receiver.
  It has an 8 pin chip labeled AT12L and 319H.
I think the 319H is the relevant number, but not sure.
Might be a pic.
   The receiver has an RF section, the RF section output feeds the input 
to the chip above.
The signal looks like this.
> https://www.dropbox.com/s/et3bmc3pc5y2rw4/Driveway%20sensor%20before%20trigger.jpg?dl=0

  After the the sensor/transmitter transmits to the receiver the signal 
changes to this,
> https://www.dropbox.com/s/foe5lvaqhprl4zg/Driveway%20sensor%20after%20trigger.jpg?dl=0

The 319H has one 2.5V on pin 1, Pin 8 is ground.
Pin 3 outputs a square wave on trigger to drive a piezo.
Pin 4 is shown in the dropbox pictures above. I think that's the input 
to the 319H.
Pin 7 goes high after trigger to drive Leds.
So, There's no nice place to pull up or down to trigger pin 3 to
make the peizo sing.

  Can someone explain what is happening on pin 4 at trigger.
Is there a way to fool it with a simple switch, or is that a code that 
the 319H is reading?

                                     Mikek

On 8/2/2018 8:45 PM, amdx wrote:
>   I want to hack the newer Driveway sensor.
> I had the old ones all figured out, now they went to all surface mount 
> parts, with a different design.
>    I just want to a add a button to trigger the peizo alarm in the 
> receiver.
>   It has an 8 pin chip labeled AT12L and 319H.
> I think the 319H is the relevant number, but not sure.
> Might be a pic.
>    The receiver has an RF section, the RF section output feeds the input 
> to the chip above.
> The signal looks like this.
>> https://www.dropbox.com/s/et3bmc3pc5y2rw4/Driveway%20sensor%20before%20trigger.jpg?dl=0 
>>
> 
>   After the the sensor/transmitter transmits to the receiver the signal 
> changes to this,
>> https://www.dropbox.com/s/foe5lvaqhprl4zg/Driveway%20sensor%20after%20trigger.jpg?dl=0 
>>
> 
> The 319H has one 2.5V on pin 1, Pin 8 is ground.
> Pin 3 outputs a square wave on trigger to drive a piezo.
> Pin 4 is shown in the dropbox pictures above. I think that's the input 
> to the 319H.
> Pin 7 goes high after trigger to drive Leds.
> So, There's no nice place to pull up or down to trigger pin 3 to
> make the peizo sing.
> 
>   Can someone explain what is happening on pin 4 at trigger.
> Is there a way to fool it with a simple switch, or is that a code that 
> the 319H is reading?
> 
>                                      Mikek

Just bumping for someone to take interest. :-)
                                 Mikek

On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
> I want to hack the newer Driveway sensor.
> I had the old ones all figured out, now they went to all surface mount 
> parts, with a different design.
>    I just want to a add a button to trigger the peizo alarm in the receiver.
>   It has an 8 pin chip labeled AT12L and 319H.
> I think the 319H is the relevant number, but not sure.
> Might be a pic.
>    The receiver has an RF section, the RF section output feeds the input 
> to the chip above.
> The signal looks like this.
> > https://www.dropbox.com/s/et3bmc3pc5y2rw4/Driveway%20sensor%20before%20trigger.jpg?dl=0
> 
>   After the the sensor/transmitter transmits to the receiver the signal 
> changes to this,
> > https://www.dropbox.com/s/foe5lvaqhprl4zg/Driveway%20sensor%20after%20trigger.jpg?dl=0
> 
> The 319H has one 2.5V on pin 1, Pin 8 is ground.
> Pin 3 outputs a square wave on trigger to drive a piezo.
> Pin 4 is shown in the dropbox pictures above. I think that's the input 
> to the 319H.
> Pin 7 goes high after trigger to drive Leds.
> So, There's no nice place to pull up or down to trigger pin 3 to
> make the peizo sing.
> 
>   Can someone explain what is happening on pin 4 at trigger.
> Is there a way to fool it with a simple switch, or is that a code that 
> the 319H is reading?
> 
>                                      Mikek

I would guess the AT12L is an indication it is an Atmel custom chip, likely an MCU with custom programming.  

I can't say I understand what your device is.  Is this a remote control device with a remote button to activate something, the piezo and LEDs only?  I think you will have to wire up your own piezo to the button.  Mallory makes some nice alerts that are designed to be panel mounted. 

Rick C. 

On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
> I want to hack the newer Driveway sensor.
> I had the old ones all figured out, now they went to all surface mount 
> parts, with a different design.
>    I just want to a add a button to trigger the peizo alarm in the receiver.
>   It has an 8 pin chip labeled AT12L and 319H.
> I think the 319H is the relevant number, but not sure.
> Might be a pic.
>    The receiver has an RF section, the RF section output feeds the input 
> to the chip above.
> The signal looks like this.
> > https://www.dropbox.com/s/et3bmc3pc5y2rw4/Driveway%20sensor%20before%20trigger.jpg?dl=0
> 
>   After the the sensor/transmitter transmits to the receiver the signal 
> changes to this,
> > https://www.dropbox.com/s/foe5lvaqhprl4zg/Driveway%20sensor%20after%20trigger.jpg?dl=0
> 
> The 319H has one 2.5V on pin 1, Pin 8 is ground.
> Pin 3 outputs a square wave on trigger to drive a piezo.
> Pin 4 is shown in the dropbox pictures above. I think that's the input 
> to the 319H.
> Pin 7 goes high after trigger to drive Leds.
> So, There's no nice place to pull up or down to trigger pin 3 to
> make the peizo sing.
> 
>   Can someone explain what is happening on pin 4 at trigger.
> Is there a way to fool it with a simple switch, or is that a code that 
> the 319H is reading?
> 
>                                      Mikek

All these modern systems transmit a code to identify the particular sensor type/location to the master control. It's probably simplest to get another dummy sensor and activate that to initiate the test.

On 8/5/2018 9:45 AM, gnuarm.deletethisbit@gmail.com wrote:
> On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
>> I want to hack the newer Driveway sensor.
>> I had the old ones all figured out, now they went to all surface mount
>> parts, with a different design.
>>     I just want to a add a button to trigger the peizo alarm in the receiver.
>>    It has an 8 pin chip labeled AT12L and 319H.
>> I think the 319H is the relevant number, but not sure.
>> Might be a pic.
>>     The receiver has an RF section, the RF section output feeds the input
>> to the chip above.
>> The signal looks like this.
>>> https://www.dropbox.com/s/et3bmc3pc5y2rw4/Driveway%20sensor%20before%20trigger.jpg?dl=0
>>
>>    After the the sensor/transmitter transmits to the receiver the signal
>> changes to this,
>>> https://www.dropbox.com/s/foe5lvaqhprl4zg/Driveway%20sensor%20after%20trigger.jpg?dl=0
>>
>> The 319H has one 2.5V on pin 1, Pin 8 is ground.
>> Pin 3 outputs a square wave on trigger to drive a piezo.
>> Pin 4 is shown in the dropbox pictures above. I think that's the input
>> to the 319H.
>> Pin 7 goes high after trigger to drive Leds.
>> So, There's no nice place to pull up or down to trigger pin 3 to
>> make the peizo sing.
>>
>>    Can someone explain what is happening on pin 4 at trigger.
>> Is there a way to fool it with a simple switch, or is that a code that
>> the 319H is reading?
>>
>>                                       Mikek
> 
> I would guess the AT12L is an indication it is an Atmel custom chip, likely an MCU with custom programming.
> 
> I can't say I understand what your device is.  Is this a remote control device with a remote button to activate something, the piezo and LEDs only?  I think you will have to wire up your own piezo to the button.  Mallory makes some nice alerts that are designed to be panel mounted.
> 
> Rick C.
> 

  Oh, sorry, it is the Bunker Hill Driveway Sensor sold at Harbor freight.
  You have a transmitter that will sense when someone or something 
enters it's area. Pretty sure it uses a PIR sensor.
  The transmitter then sends a signal up to 400ft (?) to the receiver.

  I think the 319H is the relevant number, but not sure.
 >> Might be a pic. I think this, > 
https://www.mouser.com/datasheet/2/268/40001897A-1108654.pdf
And then go back and read the section above.
                       Mikek

On Sunday, August 5, 2018 at 1:44:02 PM UTC-4, amdx wrote:
> On 8/5/2018 9:45 AM, gnuarm.deletethisbit@gmail.com wrote:
> > On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
> >> I want to hack the newer Driveway sensor.
> >> I had the old ones all figured out, now they went to all surface mount
> >> parts, with a different design.
> >>     I just want to a add a button to trigger the peizo alarm in the receiver.
> >>    It has an 8 pin chip labeled AT12L and 319H.
> >> I think the 319H is the relevant number, but not sure.
> >> Might be a pic.
> >>     The receiver has an RF section, the RF section output feeds the input
> >> to the chip above.
> >> The signal looks like this.
> >>> https://www.dropbox.com/s/et3bmc3pc5y2rw4/Driveway%20sensor%20before%20trigger.jpg?dl=0
> >>
> >>    After the the sensor/transmitter transmits to the receiver the signal
> >> changes to this,
> >>> https://www.dropbox.com/s/foe5lvaqhprl4zg/Driveway%20sensor%20after%20trigger.jpg?dl=0
> >>
> >> The 319H has one 2.5V on pin 1, Pin 8 is ground.
> >> Pin 3 outputs a square wave on trigger to drive a piezo.
> >> Pin 4 is shown in the dropbox pictures above. I think that's the input
> >> to the 319H.
> >> Pin 7 goes high after trigger to drive Leds.
> >> So, There's no nice place to pull up or down to trigger pin 3 to
> >> make the peizo sing.
> >>
> >>    Can someone explain what is happening on pin 4 at trigger.
> >> Is there a way to fool it with a simple switch, or is that a code that
> >> the 319H is reading?
> >>
> >>                                       Mikek
> > 
> > I would guess the AT12L is an indication it is an Atmel custom chip, likely an MCU with custom programming.
> > 
> > I can't say I understand what your device is.  Is this a remote control device with a remote button to activate something, the piezo and LEDs only?  I think you will have to wire up your own piezo to the button.  Mallory makes some nice alerts that are designed to be panel mounted.
> > 
> > Rick C.
> > 
> 
>   Oh, sorry, it is the Bunker Hill Driveway Sensor sold at Harbor freight.
>   You have a transmitter that will sense when someone or something 
> enters it's area. Pretty sure it uses a PIR sensor.
>   The transmitter then sends a signal up to 400ft (?) to the receiver.
> 
>   I think the 319H is the relevant number, but not sure.
>  >> Might be a pic. I think this, > 
> https://www.mouser.com/datasheet/2/268/40001897A-1108654.pdf
> And then go back and read the section above.
>                        Mikek

Ok, so you are talking about the receiver which doesn't really care much what is doing the transmitting I expect.  So the RF link is most likely the series of pulses you are seeing on the output of the RF receiver.  Since this is battery operated, I don't expect a signal is being transmitted continuously as the transmitter uses a single 9 volt battery.  This would say to me the signal you are seeing on pin 4 is not the received RF.  

I don't have any suggestions on how to false trigger the thing from a push button without adding an MCU between the receiver chip and the MCU on the board.  This MCU can generate whatever signal is required.  But that would be some work and I expect you are looking for a quick fix. 

What is the part number of the RF chip? 

Rick C.

 On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
> I want to hack the newer Driveway sensor.
> I had the old ones all figured out, now they went to all surface mount 
> parts, with a different design.
>    I just want to a add a button to trigger the peizo alarm in the receiver.
>   It has an 8 pin chip labeled AT12L and 319H.

Why not just buy a wireless doorbell?

>   Can someone explain what is happening on pin 4 at trigger.
> Is there a way to fool it with a simple switch, or is that a code that 
> the 319H is reading?

no. but do you know how pyroelectric sensors are read?
feed that input with a few Hz at low amplitude.

--
     ت

On 8/6/2018 10:03 PM, Jasen Betts wrote:
>   On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
>> I want to hack the newer Driveway sensor.
>> I had the old ones all figured out, now they went to all surface mount
>> parts, with a different design.
>>     I just want to a add a button to trigger the peizo alarm in the receiver.
>>    It has an 8 pin chip labeled AT12L and 319H.
> 
> Why not just buy a wireless doorbell?

  I had one of these driveway sensors modified and it worked fine for 
years. My business is 3 steps down, I put the sensor on the middle step,
then when someone walked down the steps, the receiver was triggered and
the obnoxious noise from the piezo would wake me up. Then maintenance 
changed the steps, the jerk must have been very curious what was inside 
this pvc pipe. So he cut the wire and took it. When I ask him about it 
he didn't know anything about it. He is what we call a liar.
  So, now I'm modifying another one. I have to modify it because it will
trigger on every car that goes by, every pedestrian and every customer 
that stands in front of my while we do business. Just want it to trigger
in that two or three foot area as they descend the stairs.
  Doorbell, yes, I just wanted the doorbell button to cause the same 
piezo to sound, that's in the driveway receiver.

> 
>>    Can someone explain what is happening on pin 4 at trigger.
>> Is there a way to fool it with a simple switch, or is that a code that
>> the 319H is reading?
> 
> no. but do you know how pyroelectric sensors are read?
> feed that input with a few Hz at low amplitude.
> 
> --
>       ت
> 

   No, I didn't but I did look at this site and got some idea.
> http://www.fuji-piezo.com/prodpyro.htm

I'm still lost, as the rf section has that constant pulsing output that
changes when the receiver gets triggered.

   I took the perfectly working assy, wallwart, voltage regulators, 
receiver and sensor, which I had working just fine at home, down to the 
business.
  I wired it all up and installed the sensor where it needs to be and 
the receiver, just will not stop beeping.

  I'm going to try another section of the fresnel patterned window and 
mount it differently. I have the PIR looking through a 1/2" piece of 
tubing with the window on the end. (same as the old unit)

I tried twice to clean this off my screen --> ت
  Eyes aren't what they used to be.
                         Mikek

On 8/7/2018 6:04 PM, amdx wrote:
> On 8/6/2018 10:03 PM, Jasen Betts wrote:
>>   On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
>>> I want to hack the newer Driveway sensor.
>>> I had the old ones all figured out, now they went to all surface mount
>>> parts, with a different design.
>>>     I just want to a add a button to trigger the peizo alarm in the
>>> receiver.
>>>    It has an 8 pin chip labeled AT12L and 319H.
>>
>> Why not just buy a wireless doorbell?
>
>   I had one of these driveway sensors modified and it worked fine for
> years. My business is 3 steps down, I put the sensor on the middle step,
> then when someone walked down the steps, the receiver was triggered and
> the obnoxious noise from the piezo would wake me up. Then maintenance
> changed the steps, the jerk must have been very curious what was inside
> this pvc pipe. So he cut the wire and took it. When I ask him about it
> he didn't know anything about it. He is what we call a liar.
>   So, now I'm modifying another one. I have to modify it because it will
> trigger on every car that goes by, every pedestrian and every customer
> that stands in front of my while we do business. Just want it to trigger
> in that two or three foot area as they descend the stairs.
>   Doorbell, yes, I just wanted the doorbell button to cause the same
> piezo to sound, that's in the driveway receiver.
>
>>
>>>    Can someone explain what is happening on pin 4 at trigger.
>>> Is there a way to fool it with a simple switch, or is that a code that
>>> the 319H is reading?
>>
>> no. but do you know how pyroelectric sensors are read?
>> feed that input with a few Hz at low amplitude.
>>
>> --
>>       ت
>>
>
>    No, I didn't but I did look at this site and got some idea.
>> http://www.fuji-piezo.com/prodpyro.htm
>
> I'm still lost, as the rf section has that constant pulsing output that
> changes when the receiver gets triggered.
>
>    I took the perfectly working assy, wallwart, voltage regulators,
> receiver and sensor, which I had working just fine at home, down to the
> business.
>   I wired it all up and installed the sensor where it needs to be and
> the receiver, just will not stop beeping.
>
>   I'm going to try another section of the fresnel patterned window and
> mount it differently. I have the PIR looking through a 1/2" piece of
> tubing with the window on the end. (same as the old unit)
>
> I tried twice to clean this off my screen --> ت
>   Eyes aren't what they used to be.
>                          Mikek
>
>
>
>
>
Why can't you just leave the fresnel where it is and modify the shape of
the pipe to get the coverage you want?  Have it view only the bottom step.

On 8/7/2018 8:56 PM, mike wrote:
> On 8/7/2018 6:04 PM, amdx wrote:
>> On 8/6/2018 10:03 PM, Jasen Betts wrote:
>>>   On Thursday, August 2, 2018 at 9:45:14 PM UTC-4, amdx wrote:
>>>> I want to hack the newer Driveway sensor.
>>>> I had the old ones all figured out, now they went to all surface mount
>>>> parts, with a different design.
>>>>     I just want to a add a button to trigger the peizo alarm in the
>>>> receiver.
>>>>    It has an 8 pin chip labeled AT12L and 319H.
>>>
>>> Why not just buy a wireless doorbell?
>>
>>   I had one of these driveway sensors modified and it worked fine for
>> years. My business is 3 steps down, I put the sensor on the middle step,
>> then when someone walked down the steps, the receiver was triggered and
>> the obnoxious noise from the piezo would wake me up. Then maintenance
>> changed the steps, the jerk must have been very curious what was inside
>> this pvc pipe. So he cut the wire and took it. When I ask him about it
>> he didn't know anything about it. He is what we call a liar.
>>   So, now I'm modifying another one. I have to modify it because it will
>> trigger on every car that goes by, every pedestrian and every customer
>> that stands in front of my while we do business. Just want it to trigger
>> in that two or three foot area as they descend the stairs.
>>   Doorbell, yes, I just wanted the doorbell button to cause the same
>> piezo to sound, that's in the driveway receiver.
>>
>>>
>>>>    Can someone explain what is happening on pin 4 at trigger.
>>>> Is there a way to fool it with a simple switch, or is that a code that
>>>> the 319H is reading?
>>>
>>> no. but do you know how pyroelectric sensors are read?
>>> feed that input with a few Hz at low amplitude.
>>>
>>> -- 
>>>       ت
>>>
>>
>>    No, I didn't but I did look at this site and got some idea.
>>> http://www.fuji-piezo.com/prodpyro.htm
>>
>> I'm still lost, as the rf section has that constant pulsing output that
>> changes when the receiver gets triggered.
>>
>>    I took the perfectly working assy, wallwart, voltage regulators,
>> receiver and sensor, which I had working just fine at home, down to the
>> business.
>>   I wired it all up and installed the sensor where it needs to be and
>> the receiver, just will not stop beeping.
>>
>>   I'm going to try another section of the fresnel patterned window and
>> mount it differently. I have the PIR looking through a 1/2" piece of
>> tubing with the window on the end. (same as the old unit)
>>
>> I tried twice to clean this off my screen --> ت
>>   Eyes aren't what they used to be.
>>                          Mikek
>>
>>
>>
>>
>>
> Why can't you just leave the fresnel where it is and modify the shape of
> the pipe to get the coverage you want?  Have it view only the bottom step.
   Maybe worth a try!