[PSUBS-MAILIST] arduino or microchip?

[Alan James via Personal_Submersibles]

Hi Roberto,I am intending having a PLC with sensors inputting to it.I hadn't thought of feeding a CO2 sensor to it own though. Had only looked at the full unitsthat go for around $500-. I see I can get a CO2 sensor for $35-https://www.futurlec.com/Gas_Sensors.shtml
Rebreather divers have O2 systems operated by computers & use 3 X O2 sensors.James Cameron had his life support system for his dive to the Marianas Trenchbuilt by a British rebreather manufacturer & based on the rebreather system. I think it's important to have in your O2 system a pediatric flow regulator that is set slightly below your minimum O2 requirements.This will flow in O2 continuously & be a fail safe. They are very cheap. You can then add the balance of O2 required by a computerized system, or a bellows add system (unit can be bought from Nuytco ) or mearly manually addO2 with a valve, as required.Alan
      From: roberto alvarez via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Saturday, November 15, 2014 6:17 AM
 Subject: [PSUBS-MAILIST] arduino or microchip?
   
Good Morning, first i am not an electronics master, was working on the co2 scrubers , then  my imagination again move ahead of my hands and make me thik that the scruber must be inteligent,  based on the parameters
cabin pressure,CO2 , O2 concentration and temperature,  i think that will be helpfull a device for monitor this conditions, found a programable board with the optional  sensors, the UNO ( 4 dlls on ebay ) the barometric pressure sensor ( 2 dlls on ebay )  the carbon monoxide sensor ( 4 dlls) , tilt sensors (1.75 usd) and many other sensors
with this info, this boar will check cabin pressure and co2 %, the boar can activate a relay to let oxigen enter and keep a safe enviroment
also the tilt sensors can help me to control position in low visibility conditions, may be will need 3 boards and several sensors that will let me have an auxiliar control system

Another system that i need develop  or know if can be develop or find is a neutral bouyancy , based in flow of water on the vertical axle, this black box ( because i dont know what will have inside )  will control valves on the variable ballast system
just my ideas, if this is for sale some were ,please tell me to consider with the arduino a complet system looks to be below 100 usd as will be common sensors ans actuators ( relays ) 
i draw a system using just relays and mercury switches ( the ones that stop the outboard when tilt,or on the ac thermosthats )  buw will take a big space and many meters of wire, will be a heat source , a single boar can solve this, buti need your comments, thanks

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