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Parallel in - serial out shift register

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Boncuk

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Hi All,

the attached schematic is part of the control system of my evaporative cooling system.

To find out the optimum parameter settings of the final design I designed a prototype control circuit offering the options of operating two parallel 3-speed fans at any setting (e.g. fan1 off, fan2 speed setting 1). The system also contains six water spray bars with a total of 18 spray nozzles to be activated in any configuration.

The system will also be equipped with an SD-card device used as data logger.

The 24-key-pad should be connected to parallel in - serial out shift registers M74HC165.

Should pin10 of IC1 be connected anywhere for proper function?

Regards

Boncuk
 

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Hi All,

the attached schematic is part of the control system of my evaporative cooling system.

To find out the optimum parameter settings of the final design I designed a prototype control circuit offering the options of operating two parallel 3-speed fans at any setting (e.g. fan1 off, fan2 speed setting 1). The system also contains six water spray bars with a total of 18 spray nozzles to be activated in any configuration.

The system will also be equipped with an SD-card device used as data logger.

The 24-key-pad should be connected to parallel in - serial out shift registers M74HC165.

Should pin10 of IC1 be connected anywhere for proper function?

Regards

Boncuk

Hi Hans
I would connect it Low so that '0' s are clocked in.
 
Thanks Eric,

I'll use a jumper and remove it in case it's not necessary. :)

Regards

Hans
 
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