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From: john larkin <jlArbor.com>
Newsgroups: sci.electronics.design
Subject: Re: relay board
Date: Mon, 24 Mar 2025 09:19:02 -0700
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On Mon, 24 Mar 2025 12:09:53 -0400, bitrex <user@example.net> wrote:

>On 3/24/2025 11:26 AM, john larkin wrote:
>> On Mon, 24 Mar 2025 11:05:32 -0400, bitrex <user@example.net> wrote:
>> 
>>> On 3/24/2025 10:33 AM, john larkin wrote:
>>>>
>>>> Here's another PCB:
>>>>
>>>> https://www.dropbox.com/scl/fi/yxqdj418jx1ttuusqqehg/P946_Relays_A11.jpg?rlkey=hxshyt4mze59k31xpnsi3bfzc&raw=1
>>>>
>>>> I figured we could have a relay board in our modular power system, and
>>>> my PCB layout guy had time, so I did one.
>>>>
>>>> Then I figured that instead of fuses to protect the contacts and PCB
>>>> traces, I could use Hall sensors and drop out a relay if the current
>>>> exceeds 8 amps. Then I figured I may as well report the currents to
>>>> users. And why not voltage too? Then  it became a programmable circuit
>>>> breaker module. With average and RMS voltage and current and power
>>>> measurement and waveforms.  And programmable ganging. And plugin fuses
>>>> for bussing. Somebody stop me.
>>>>
>>>
>>> Better is the enemy of the good
>> 
>> Selling more is better than selling less.
>> 
>
>With respect to hardware UIs my heuristic is that number of users who'll 
>use a given feature declines exponentially with the depth of the menu 
>dive they must go on to get to said feature

We don't want complexity to drive away users, which suggests limiting
or at least simplifying features.

I think we'll make power metering an extra-cost option, partly for
that reason.

If people just want relays, I don't think the circuit breaker function
will scare them off. They don't have to use it, and everybody already
is used to circuit breakers.