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<blockquote data-quote="rstrouse" data-source="post: 199" data-attributes="member: 55"><p>To wrap up the conversation above, the key components of the BAS include:</p><p>1. The ability to power the pi with a 24vac or dc power supply. These power supplies are required for other equipment.</p><p>2. 10k temperature sensors</p><p>3. Dry contact sensors for flow switches</p><p>4. RS485 pass thru</p><p></p><p>When it comes to the BAS and all its capabilities, there is no need for PWM input or output and if that was replaced with 4-20ma then perhaps flow sensors could be accommodated. There are a number of low cost flow sensors out there but I don't know their reliability. They would make the most sense on a fill line and not part of the 2+ inch pool plumbing.</p><p></p><p>When you stack an 8 relay on the pi you now have the ability to switch up to 8 circuits on a single body system or 2 valves and 6 circuits on a shared body system. Keep in mind you cannot effectively operate a valve actuator without NO-COM-NC contacts. I am not an EE but most of the mofset implementations that I have seen have been SPST circuits.</p><p></p><p>It would be great to get a carrier for Atlas chemistry automation. One that doesn't have the goofball 40-pin pass thru connector on it.</p></blockquote><p></p>
[QUOTE="rstrouse, post: 199, member: 55"] To wrap up the conversation above, the key components of the BAS include: 1. The ability to power the pi with a 24vac or dc power supply. These power supplies are required for other equipment. 2. 10k temperature sensors 3. Dry contact sensors for flow switches 4. RS485 pass thru When it comes to the BAS and all its capabilities, there is no need for PWM input or output and if that was replaced with 4-20ma then perhaps flow sensors could be accommodated. There are a number of low cost flow sensors out there but I don't know their reliability. They would make the most sense on a fill line and not part of the 2+ inch pool plumbing. When you stack an 8 relay on the pi you now have the ability to switch up to 8 circuits on a single body system or 2 valves and 6 circuits on a shared body system. Keep in mind you cannot effectively operate a valve actuator without NO-COM-NC contacts. I am not an EE but most of the mofset implementations that I have seen have been SPST circuits. It would be great to get a carrier for Atlas chemistry automation. One that doesn't have the goofball 40-pin pass thru connector on it. [/QUOTE]
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