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<blockquote data-quote="sequent" data-source="post: 189" data-attributes="member: 1"><p>Our goal is to design a single card similar with Building Auto and Industrial Auto, with dedicated inputs and outputs to handle all the Pool Auto needs. So far I've learned the following: </p><p></p><p>CHEMICAL INPUTS</p><p>We need to read chemical values which need dedicated probes and boards. The most convenient way for everybody is to include on-board carriers for the Atlas Scientific modules like the <a href="https://atlas-scientific.com/embedded-solutions/ezo-ph-circuit/" target="_blank">EZO-pH Circuit</a>. If you want to measure pH, you plug the module in. Else, leave it empty. I am inclined to include three carrier sockets. Atlas seems to have modules for all the stuff one might want to measure in the water. </p><p>We designed something similar for another customer. </p><p>[ATTACH=full]23[/ATTACH]</p><p></p><p>TEMPERATURE MEASUREMENTS</p><p>The way to go seems to be 1-Wire. You can daisy chain multiple probes to read water and air temperatures. Probes are cheap and offer enough precision. I do not see the need for super-precise probes like RTD</p><p></p><p>ISOLATED RS485 INTERFACE</p><p></p><p>24VAC POWER SUPPLY</p><p></p><p>RELAY OUTPUTS. </p><p>The consensus seems to be lots of them. Probably 12 is a good number. Normal open only, 2A/24V.</p><p>Just in case, the card would be expandable, so you could add another <a href="https://sequentmicrosystems.com/collections/industrial-automation/products/sixteen-relays-8-layer-stackable-hat-for-raspberry-pi" target="_blank">16-RELAYS</a> on top.</p><p></p><p>HIGH POWER LOADS. </p><p>Not on this card. We have a <a href="https://sequentmicrosystems.com/collections/industrial-automation/products/three-40a-240v-relays-rs485-for-raspberry-pi" target="_blank">3-RELAYS</a> card which can switch 40A/250V and can be chained on the RS485 interface. </p><p>Best would be to keep the high voltage elsewhere, next to whatever you use to heat or pump the water. </p><p>With this card you can control almost any 3-phase high power load, inductive or resistive.</p><p></p><p>OTHER ANALOG INPUTS AND OUTPUTS </p><p>Here I do not have clarity. Your input would be appreciated.</p><p>Do you need 0-10V or 4-20mA IN and OUT? How many of each?</p></blockquote><p></p>
[QUOTE="sequent, post: 189, member: 1"] Our goal is to design a single card similar with Building Auto and Industrial Auto, with dedicated inputs and outputs to handle all the Pool Auto needs. So far I've learned the following: CHEMICAL INPUTS We need to read chemical values which need dedicated probes and boards. The most convenient way for everybody is to include on-board carriers for the Atlas Scientific modules like the [URL='https://atlas-scientific.com/embedded-solutions/ezo-ph-circuit/']EZO-pH Circuit[/URL]. If you want to measure pH, you plug the module in. Else, leave it empty. I am inclined to include three carrier sockets. Atlas seems to have modules for all the stuff one might want to measure in the water. We designed something similar for another customer. [ATTACH type="full" width="279px"]23[/ATTACH] TEMPERATURE MEASUREMENTS The way to go seems to be 1-Wire. You can daisy chain multiple probes to read water and air temperatures. Probes are cheap and offer enough precision. I do not see the need for super-precise probes like RTD ISOLATED RS485 INTERFACE 24VAC POWER SUPPLY RELAY OUTPUTS. The consensus seems to be lots of them. Probably 12 is a good number. Normal open only, 2A/24V. Just in case, the card would be expandable, so you could add another [URL='https://sequentmicrosystems.com/collections/industrial-automation/products/sixteen-relays-8-layer-stackable-hat-for-raspberry-pi']16-RELAYS[/URL] on top. HIGH POWER LOADS. Not on this card. We have a [URL='https://sequentmicrosystems.com/collections/industrial-automation/products/three-40a-240v-relays-rs485-for-raspberry-pi']3-RELAYS[/URL] card which can switch 40A/250V and can be chained on the RS485 interface. Best would be to keep the high voltage elsewhere, next to whatever you use to heat or pump the water. With this card you can control almost any 3-phase high power load, inductive or resistive. OTHER ANALOG INPUTS AND OUTPUTS Here I do not have clarity. Your input would be appreciated. Do you need 0-10V or 4-20mA IN and OUT? How many of each? [/QUOTE]
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