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Forum: Appliances & Gadgets

12-27-17, 09:52 PM

Replies: 29

Upgrading my computer - faster & more efficient

Views: 23,226

Posted By theoldwizard1

Sorry for being late to the party ! If...

Sorry for being late to the party !

If you are really going to buy a new computer system, then this is the best suggestion !

The typical desktop and laptop unit have just hit the market. ...

Forum: Geothermal & Heat Pumps

11-19-14, 06:53 PM

Replies: 331

Designing a General Purpose Heat Pump Controller

Views: 203,711

Posted By theoldwizard1

Yep ! Their only issue is "accuracy" at the...

Yep ! Their only issue is "accuracy" at the extremes of their range.

Below is a "typical" thermistor "transfer function".
...

Forum: Geothermal & Heat Pumps

11-19-14, 06:37 PM

Replies: 331

Designing a General Purpose Heat Pump Controller

Views: 203,711

Posted By theoldwizard1

Arduino Une and Mega chip (ATmega328) does not...

Arduino Une and Mega chip (ATmega328) does not have a "native" floating point processor. Floating point is done via compiler libraries, which can be very slow.

IMHO, float should be avoided at...

Forum: Geothermal & Heat Pumps

11-17-14, 09:53 PM

Replies: 331

Designing a General Purpose Heat Pump Controller

Views: 203,711

Posted By theoldwizard1

SIDEBAR on thermistors, wiring and A-to-D inputs ...

SIDEBAR on thermistors, wiring and A-to-D inputs

A thermistor is a devices whose resistance changes with temperature. The problem with them is that they loose "accuracy" at the ends of their...

Forum: Geothermal & Heat Pumps

11-17-14, 09:24 PM

Replies: 331

Designing a General Purpose Heat Pump Controller

Views: 203,711

Posted By theoldwizard1

Highly unlikely ! In order to "find" an...

Highly unlikely !

In order to "find" an input/output "device" means that device must have some intelligence to answer the question "Who/what are you ?" with "I am a ...". Temperature sensor are...

Forum: Geothermal & Heat Pumps

11-17-14, 06:08 AM

Replies: 37

Anybody ever build a natural gas heat pump?

Views: 32,958

Posted By theoldwizard1

From Wikipedia I actually worked...

From Wikipedia

I actually worked alongside some guys trying to develop a Wankel engine to run the A/C compressor in the late 1980s. The engine would run on natural gas. It was aimed at...

Forum: Conservation

11-12-14, 01:27 PM

Replies: 90

Preparing for Infrastructure Lapses...

Views: 55,811

Posted By theoldwizard1

A fully charged 12V lead acid battery is NOT 12V....

A fully charged 12V lead acid battery is NOT 12V. It could easily be between 11V and 13V.

Also a lead acid battery does not start to "accept" a charge until at least 13.2V and some chargers (not...

Forum: Solar Power

10-30-14, 08:15 PM

Replies: 3

Grid tie inverters

Views: 6,999

Posted By theoldwizard1

Exactly what I expected. Any "48V" rated GTI...

Exactly what I expected. Any "48V" rated GTI inverter will handle what the charge controller can put out which would like not exceed 58V,

Forum: Geothermal & Heat Pumps

10-28-14, 09:41 AM

Replies: 331

Designing a General Purpose Heat Pump Controller

Views: 203,711

Posted By theoldwizard1

Write a "generic" delay called function. Compile...

Write a "generic" delay called function. Compile it as a separate file with the optimizer turned off (-O0 on gcc, IIRC). Link it in.

When messing with ISR, make sure you understand any...

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