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<blockquote data-quote="cmc0619" data-source="post: 231" data-attributes="member: 61"><p>My $0.02</p><p>I don't think you need any digital outputs. </p><p></p><p>Relays:</p><p>I think relays could ALL be off-board. You have those great 8/16 relay daughter cards already that can easily be added on. I didn't know what a triac was but it sounds like you could feed a real relay from one and they probably take up less board space. I'm of the opinion that switching high voltage(120VAC+) should be done away from the Raspberry Pi. My NO switches are 2 lights (pool/spa), pool cleaner, SPA blower, and heater control(LV) and they all hang off Automation Direct relays built for HV. Triacs would be a nice way to trigger them. The automation direct relays I use require 13mA @ 24VAC to fire. There's just no way I'd power anything high voltage directly from a Raspberry Pi daughter card for a number of reasons.</p><p></p><p>Musts:</p><p>24v *AC*/DC power input. This way we can share 24VAC with the valves and power the Raspberry Pi. I do this with my megabas today and it works great.</p><p>RS-485. Comms to control pool pumps, heaters, etc</p><p></p><p>Inputs... Here's where the answer is "It depends"</p><p>2 4-20mA. Some flow meters, pH meters(IXIAN), hall effect current monitors use these</p><p>4 0-10V. Pressure transducers, hall effect current sensors</p><p>4 10k Thermistor. Measuring temps</p><p>4 Dry contact sensors. Flow counters, flow switches (I think you'd want 2 for flow switches alone for safety)</p><p></p><p>Ideally, something universal selectable with jumpers (I think the MegaBAS does this today) would be even cooler so people could adapt the system to their unique needs and maybe you could get by with 10 pins instead of 14</p><p></p><p>Bonus: Atlas Scientific carrier would be awesome! (EC, pH, and ORP are the ones I'd use)</p><p>2-4(or more!) SPDT 24VAC Triacs supporting 750mA to drive actuators directly sounds incredible but sounds like SPDT triacs are not a thing?</p><p></p><p>Like Katodude said the MegaBAS was almost there.</p></blockquote><p></p>
[QUOTE="cmc0619, post: 231, member: 61"] My $0.02 I don't think you need any digital outputs. Relays: I think relays could ALL be off-board. You have those great 8/16 relay daughter cards already that can easily be added on. I didn't know what a triac was but it sounds like you could feed a real relay from one and they probably take up less board space. I'm of the opinion that switching high voltage(120VAC+) should be done away from the Raspberry Pi. My NO switches are 2 lights (pool/spa), pool cleaner, SPA blower, and heater control(LV) and they all hang off Automation Direct relays built for HV. Triacs would be a nice way to trigger them. The automation direct relays I use require 13mA @ 24VAC to fire. There's just no way I'd power anything high voltage directly from a Raspberry Pi daughter card for a number of reasons. Musts: 24v *AC*/DC power input. This way we can share 24VAC with the valves and power the Raspberry Pi. I do this with my megabas today and it works great. RS-485. Comms to control pool pumps, heaters, etc Inputs... Here's where the answer is "It depends" 2 4-20mA. Some flow meters, pH meters(IXIAN), hall effect current monitors use these 4 0-10V. Pressure transducers, hall effect current sensors 4 10k Thermistor. Measuring temps 4 Dry contact sensors. Flow counters, flow switches (I think you'd want 2 for flow switches alone for safety) Ideally, something universal selectable with jumpers (I think the MegaBAS does this today) would be even cooler so people could adapt the system to their unique needs and maybe you could get by with 10 pins instead of 14 Bonus: Atlas Scientific carrier would be awesome! (EC, pH, and ORP are the ones I'd use) 2-4(or more!) SPDT 24VAC Triacs supporting 750mA to drive actuators directly sounds incredible but sounds like SPDT triacs are not a thing? Like Katodude said the MegaBAS was almost there. [/QUOTE]
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