LG hombot robot vacuum cleaner disassembly

[Jan Panteltje]

Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

 

[John Larkin]

On Fri, 11 Apr 2014 10:11:35 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com>
wrote:

Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

I work with electronics all day. We have to think really hard to solve complex
puzzles, sometimes under pressure from customers. I absolutely don't want to
come home and battle buggy firmware and puzzle over someone else's bizarre user
interfaces. Cord, switch, motor is the maximum level of complexity I want to
manage when I'm not being paid to do it.

I use PCs at work, so I got my wife all Apple stuff, specifically so I can't be
expected to help her with it.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation

 

[Jan Panteltje]

On a sunny day (Fri, 11 Apr 2014 07:19:34 -0700) it happened John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
<68ufk9l8ubs4edmn2jr8e0sgl6860o3crs@4ax.com>:

On Fri, 11 Apr 2014 10:11:35 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com
wrote:


Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

I work with electronics all day. We have to think really hard to solve complex
puzzles, sometimes under pressure from customers. I absolutely don't want to
come home and battle buggy firmware and puzzle over someone else's bizarre user
interfaces. Cord, switch, motor is the maximum level of complexity I want to
manage when I'm not being paid to do it.

I use PCs at work, so I got my wife all Apple stuff, specifically so I can't be
expected to help her with it.

Yea, well I made my living for a long time in broadcast,
and 'the show must go on', and how the f*k you do it at that moment is less important.
And that was in shifts too, 12 hour days...
Increasing complexity, came from tubes to integrated circuits, 10 minutes
is a long time but you need to fix something you have sometimes never seen before, and
especially never used before... in less if possible.
So its always fun to fix things, keeps the mind alive, had the diagnosis 100% right.
I am not impressed by any of your complex designs as far as complexity goes,
have you ever seen the circuit diagram of a color TV studio?
And the equipment in it?
Just wrote an other display driver today... between coffees, build the test hardware too.

 

[John Larkin]

On Fri, 11 Apr 2014 15:54:16 GMT, Jan Panteltje <panteltje@yahoo.com> wrote:

On a sunny day (Fri, 11 Apr 2014 07:19:34 -0700) it happened John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
68ufk9l8ubs4edmn2jr8e0sgl6860o3crs@4ax.com>:

On Fri, 11 Apr 2014 10:11:35 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com
wrote:


Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

I work with electronics all day. We have to think really hard to solve complex
puzzles, sometimes under pressure from customers. I absolutely don't want to
come home and battle buggy firmware and puzzle over someone else's bizarre user
interfaces. Cord, switch, motor is the maximum level of complexity I want to
manage when I'm not being paid to do it.

I use PCs at work, so I got my wife all Apple stuff, specifically so I can't be
expected to help her with it.

Yea, well I made my living for a long time in broadcast,
and 'the show must go on', and how the f*k you do it at that moment is less important.
And that was in shifts too, 12 hour days...
Increasing complexity, came from tubes to integrated circuits, 10 minutes
is a long time but you need to fix something you have sometimes never seen before, and
especially never used before... in less if possible.
So its always fun to fix things, keeps the mind alive, had the diagnosis 100% right.
I am not impressed by any of your complex designs as far as complexity goes,
have you ever seen the circuit diagram of a color TV studio?
And the equipment in it?
Just wrote an other display driver today... between coffees, build the test hardware too.

This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

PCIe interface, FPGA, ARM, several fiberoptic picosecond-resolution time
stampers, 16 1-ns resolution fiberoptic pulse outputs (pretty clever, wish it
was my idea), a piezo driver ARB, 16 fast energy sensor interfaces, system and
PLC interfaces, Ethernet, 68 total connectors to the outside world. Lots of
mixed analog and digital technologies.



--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation

 

[Cydrome Leader]

In sci.electronics.repair John Larkin <jjlarkin@highnotlandthistechnologypart.com> wrote:

On Fri, 11 Apr 2014 15:54:16 GMT, Jan Panteltje <panteltje@yahoo.com> wrote:

On a sunny day (Fri, 11 Apr 2014 07:19:34 -0700) it happened John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
68ufk9l8ubs4edmn2jr8e0sgl6860o3crs@4ax.com>:

On Fri, 11 Apr 2014 10:11:35 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com
wrote:


Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

I work with electronics all day. We have to think really hard to solve complex
puzzles, sometimes under pressure from customers. I absolutely don't want to
come home and battle buggy firmware and puzzle over someone else's bizarre user
interfaces. Cord, switch, motor is the maximum level of complexity I want to
manage when I'm not being paid to do it.

I use PCs at work, so I got my wife all Apple stuff, specifically so I can't be
expected to help her with it.

Yea, well I made my living for a long time in broadcast,
and 'the show must go on', and how the f*k you do it at that moment is less important.
And that was in shifts too, 12 hour days...
Increasing complexity, came from tubes to integrated circuits, 10 minutes
is a long time but you need to fix something you have sometimes never seen before, and
especially never used before... in less if possible.
So its always fun to fix things, keeps the mind alive, had the diagnosis 100% right.
I am not impressed by any of your complex designs as far as complexity goes,
have you ever seen the circuit diagram of a color TV studio?
And the equipment in it?
Just wrote an other display driver today... between coffees, build the test hardware too.


This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

What's going on with with the large resistor?

 

[Jan Panteltje]

On a sunny day (Fri, 11 Apr 2014 09:19:32 -0700) it happened John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
<eu4gk9d3ftiu93fecl3rcjqvcin9vhmfpk@4ax.com>:

This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

PCIe interface, FPGA, ARM, several fiberoptic picosecond-resolution time
stampers, 16 1-ns resolution fiberoptic pulse outputs (pretty clever, wish it
was my idea), a piezo driver ARB, 16 fast energy sensor interfaces, system and
PLC interfaces, Ethernet, 68 total connectors to the outside world. Lots of
mixed analog and digital technologies.

OK now imagine a couple of thousand of boxes like that, all different of course,
with miles and miles of cable interconnect, multiple control points, MW
power consumption (all together) and thousands of people working with these,
and flipped out screaming directors and a short timetable.
And locations, size, remote, satellite links, and all on the tick of the clock,
and you have a modern broadcast complex.
Light, sound, video,

 

[Jon Elson]

Jan Panteltje wrote:


> Shit it just pulled out the cable to the LED lights.
Yeah, this whole robot thing is highly overrated. Nobody
would have a totally stone drunk sailor run a vacuum in
their home. But, that is what the robot is, it just stumbles
around until it hits something, then backs off and tries
again.

Jon

 

[Jon Elson]

John Larkin wrote:

I use PCs at work, so I got my wife all Apple stuff, specifically so I
can't be expected to help her with it.

Yeah, I'd never be able to get away with that! My wife didn't even know
how to turn off her car alarm when she set it off. Some "helpful"
people started pulling fuses out of the car, and she ended up driving for
half a day with no stop lights and having to override the gearshift
interlock. She had to call me so I could tell her "just lock and unlock
the car with the key and it turns off the alarm."

I've got almost everybody running Linux of various versions, I do
network backups when I get around to it, mostly it all works.

Jon

 

[John Larkin]

On Fri, 11 Apr 2014 18:15:30 GMT, Jan Panteltje <panteltje@yahoo.com>
wrote:

On a sunny day (Fri, 11 Apr 2014 09:19:32 -0700) it happened John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
eu4gk9d3ftiu93fecl3rcjqvcin9vhmfpk@4ax.com>:

This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

PCIe interface, FPGA, ARM, several fiberoptic picosecond-resolution time
stampers, 16 1-ns resolution fiberoptic pulse outputs (pretty clever, wish it
was my idea), a piezo driver ARB, 16 fast energy sensor interfaces, system and
PLC interfaces, Ethernet, 68 total connectors to the outside world. Lots of
mixed analog and digital technologies.

OK now imagine a couple of thousand of boxes like that, all different of course,
with miles and miles of cable interconnect, multiple control points, MW
power consumption (all together) and thousands of people working with these,
and flipped out screaming directors and a short timetable.
And locations, size, remote, satellite links, and all on the tick of the clock,
and you have a modern broadcast complex.
Light, sound, video,

I wouldn't enjoy that. The alpha males would be the producers and the
"artists" and the "talent." Techs and engineers are peons in a culture
like that. And I like to work on time scales of weeks and picoseconds,
not minutes.

There's the same problem in companies started by scientists; EEs get
little respect. It's usually better in companies founded by engineers.




--

John Larkin Highland Technology, Inc

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[Phil Hobbs]

On 04/11/2014 03:23 PM, John Larkin wrote:

On Fri, 11 Apr 2014 18:15:30 GMT, Jan Panteltje <panteltje@yahoo.com
wrote:

On a sunny day (Fri, 11 Apr 2014 09:19:32 -0700) it happened John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
eu4gk9d3ftiu93fecl3rcjqvcin9vhmfpk@4ax.com>:

This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

PCIe interface, FPGA, ARM, several fiberoptic picosecond-resolution time
stampers, 16 1-ns resolution fiberoptic pulse outputs (pretty clever, wish it
was my idea), a piezo driver ARB, 16 fast energy sensor interfaces, system and
PLC interfaces, Ethernet, 68 total connectors to the outside world. Lots of
mixed analog and digital technologies.

OK now imagine a couple of thousand of boxes like that, all different of course,
with miles and miles of cable interconnect, multiple control points, MW
power consumption (all together) and thousands of people working with these,
and flipped out screaming directors and a short timetable.
And locations, size, remote, satellite links, and all on the tick of the clock,
and you have a modern broadcast complex.
Light, sound, video,

I wouldn't enjoy that. The alpha males would be the producers and the
"artists" and the "talent." Techs and engineers are peons in a culture
like that. And I like to work on time scales of weeks and picoseconds,
not minutes.

There's the same problem in companies started by scientists; EEs get
little respect. It's usually better in companies founded by engineers.




Yup. Same in astronomy and biotech.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

 

[John Larkin]

On Fri, 11 Apr 2014 20:56:19 +0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:

In sci.electronics.repair John Larkin <jjlarkin@highnotlandthistechnologypart.com> wrote:
On Fri, 11 Apr 2014 15:54:16 GMT, Jan Panteltje <panteltje@yahoo.com> wrote:

On a sunny day (Fri, 11 Apr 2014 07:19:34 -0700) it happened John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
68ufk9l8ubs4edmn2jr8e0sgl6860o3crs@4ax.com>:

On Fri, 11 Apr 2014 10:11:35 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com
wrote:


Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

I work with electronics all day. We have to think really hard to solve complex
puzzles, sometimes under pressure from customers. I absolutely don't want to
come home and battle buggy firmware and puzzle over someone else's bizarre user
interfaces. Cord, switch, motor is the maximum level of complexity I want to
manage when I'm not being paid to do it.

I use PCs at work, so I got my wife all Apple stuff, specifically so I can't be
expected to help her with it.

Yea, well I made my living for a long time in broadcast,
and 'the show must go on', and how the f*k you do it at that moment is less important.
And that was in shifts too, 12 hour days...
Increasing complexity, came from tubes to integrated circuits, 10 minutes
is a long time but you need to fix something you have sometimes never seen before, and
especially never used before... in less if possible.
So its always fun to fix things, keeps the mind alive, had the diagnosis 100% right.
I am not impressed by any of your complex designs as far as complexity goes,
have you ever seen the circuit diagram of a color TV studio?
And the equipment in it?
Just wrote an other display driver today... between coffees, build the test hardware too.


This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

What's going on with with the large resistor?

That's the source termination resistor that drives the cable to a piezo
transducer. The optimum value wasn't known, so we made it easy to replace in the
field.

The piezo squirts molten tin droplets into space at around 50 KHz.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation

 

[Cydrome Leader]

In sci.electronics.repair John Larkin <jjlarkin@highnotlandthistechnologypart.com> wrote:

On Fri, 11 Apr 2014 20:56:19 +0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:

In sci.electronics.repair John Larkin <jjlarkin@highnotlandthistechnologypart.com> wrote:
On Fri, 11 Apr 2014 15:54:16 GMT, Jan Panteltje <panteltje@yahoo.com> wrote:

On a sunny day (Fri, 11 Apr 2014 07:19:34 -0700) it happened John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
68ufk9l8ubs4edmn2jr8e0sgl6860o3crs@4ax.com>:

On Fri, 11 Apr 2014 10:11:35 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com
wrote:


Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

I work with electronics all day. We have to think really hard to solve complex
puzzles, sometimes under pressure from customers. I absolutely don't want to
come home and battle buggy firmware and puzzle over someone else's bizarre user
interfaces. Cord, switch, motor is the maximum level of complexity I want to
manage when I'm not being paid to do it.

I use PCs at work, so I got my wife all Apple stuff, specifically so I can't be
expected to help her with it.

Yea, well I made my living for a long time in broadcast,
and 'the show must go on', and how the f*k you do it at that moment is less important.
And that was in shifts too, 12 hour days...
Increasing complexity, came from tubes to integrated circuits, 10 minutes
is a long time but you need to fix something you have sometimes never seen before, and
especially never used before... in less if possible.
So its always fun to fix things, keeps the mind alive, had the diagnosis 100% right.
I am not impressed by any of your complex designs as far as complexity goes,
have you ever seen the circuit diagram of a color TV studio?
And the equipment in it?
Just wrote an other display driver today... between coffees, build the test hardware too.


This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

What's going on with with the large resistor?


That's the source termination resistor that drives the cable to a piezo
transducer. The optimum value wasn't known, so we made it easy to replace in the
field.

The piezo squirts molten tin droplets into space at around 50 KHz.

That makes sense.

The chassis seems pretty itense. Are these made in house or to order or
are they start as an off the shelf product?

 

[John Larkin]

On Sat, 12 Apr 2014 20:56:38 +0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:

In sci.electronics.repair John Larkin <jjlarkin@highnotlandthistechnologypart.com> wrote:
On Fri, 11 Apr 2014 20:56:19 +0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:

In sci.electronics.repair John Larkin <jjlarkin@highnotlandthistechnologypart.com> wrote:
On Fri, 11 Apr 2014 15:54:16 GMT, Jan Panteltje <panteltje@yahoo.com> wrote:

On a sunny day (Fri, 11 Apr 2014 07:19:34 -0700) it happened John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
68ufk9l8ubs4edmn2jr8e0sgl6860o3crs@4ax.com>:

On Fri, 11 Apr 2014 10:11:35 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com
wrote:


Had the 'suction motor' on the lab supply.
12V 300mA (280 mA when vacuum sucked, not much sucking power really).
It has some temp sensor mounted on the side, so is protected.
Nothing wrong with the motor.
Stupid hobbyist amateur LG design sensor system,
bridged the sensor resistor in the driver with a 10 cm piece of
wire from flat cable, works 100% OK now, apart from its other quirks.
It came after me! wow.
2 minute soldering job, its running now.
And its silent, pulled the speaker plug!
Hit my plant again too, just in time stopped it from falling over by pressing stop on the remote.
Will it go up in flames if the motor shorts or something?
Well there is something to say for that, probably sets the lipo on fire or
burns the PCB, but my experience is that the resistance of the strand of flatcable
is so high that it will shut of its sensors anyways, and the thermal cutout on the motor as last resort.
And I Am Watching It.


Shit it just pulled out the cable to the LED lights.

I work with electronics all day. We have to think really hard to solve complex
puzzles, sometimes under pressure from customers. I absolutely don't want to
come home and battle buggy firmware and puzzle over someone else's bizarre user
interfaces. Cord, switch, motor is the maximum level of complexity I want to
manage when I'm not being paid to do it.

I use PCs at work, so I got my wife all Apple stuff, specifically so I can't be
expected to help her with it.

Yea, well I made my living for a long time in broadcast,
and 'the show must go on', and how the f*k you do it at that moment is less important.
And that was in shifts too, 12 hour days...
Increasing complexity, came from tubes to integrated circuits, 10 minutes
is a long time but you need to fix something you have sometimes never seen before, and
especially never used before... in less if possible.
So its always fun to fix things, keeps the mind alive, had the diagnosis 100% right.
I am not impressed by any of your complex designs as far as complexity goes,
have you ever seen the circuit diagram of a color TV studio?
And the equipment in it?
Just wrote an other display driver today... between coffees, build the test hardware too.


This is pretty complex:

https://dl.dropboxusercontent.com/u/53724080/TEM2/DSC09478.JPG

https://dl.dropboxusercontent.com/u/53724080/TEM2/Rear.jpg

https://dl.dropboxusercontent.com/u/53724080/TEM2/Tem2_Top.jpg

What's going on with with the large resistor?


That's the source termination resistor that drives the cable to a piezo
transducer. The optimum value wasn't known, so we made it easy to replace in the
field.

The piezo squirts molten tin droplets into space at around 50 KHz.

That makes sense.

The chassis seems pretty itense. Are these made in house or to order or
are they start as an off the shelf product?

We did the design, and send the drawings out to a sheet metal shop.

All the sheet metal bits together cost about $180, with PEMS and such.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation

 

[Jeroni Paul]

Sometimes conductive dust accumulates in the gaps between rotor contacts and causes a partial short. This increases current draw and lowers performance and is a common cause for motor drivers to sense an overload.