Reagent Robot
Description
Reagent Robot ============ The Idea Here Is To Remove Human Variability And Provide For Automated Data Collection With Low Cost Chemical Reagent Tests For Common Water Conditions Such As Ammonia, Chlorine, Nitrate/Nitrite, And Ph. Currently, The Electronic Sensors For Those Test Are Very, Very Expensive And Require Frequent Replacement. This Thing Shows A Possible Design For The Reaction Chamber Where The Chemical Indicator Is Added To The Sample Water And Led/Photodetector Combination Is Used To Test The Color Of The Resulting Mixture. This Design Is Not Meant To Be A Final Product, But Instead Just A Starting Point. The Bottom Plate Simply Has A Hole Drilled Part Way Through For The Stirrer/Cleaner Shaft To Sit In. A Single Ball From A Bearing Would Be Dropped In The Hole To Reduce Friction And Extend The Life Of The "Bearing". Initially, This Plate Could Be Plex, But Eventually Should Be Something More Durable. The Center (Clear) Area Is A Square Block Of Plex With A Large Circular Hole In The Middle Where The Sample Will Be Held. A Stirrer / Cleaner Made From Metal With A Vertical Shaft Turns In This Space To Both Stir The Sample And Reagent And To Clean The Sides Of The Chamber To Ensure Consistent Optical Performance Over Time. The Shaft Exits The Top Plate And Connects To A Small Stepper Or Gear Motor Which Is Not Shown. If The Recommended Injector Is Used, The Motor Of The Injector Could Be Used To Turn The Stirrer / Cleaner, But This Is Not Necessary To The Design. The Black Top Plate Has Holes For The Inlet Of Water From The Valve (Not Pictured) And Exit Of The Prior Sample (To Drain). Not Shown Is The Small Hole For The Inlet Of The Reagent From The Injector Pump. An Animation Might Help: Https://Www.Youtube.Com/Watch?V=5Hvgm40Ikcw Reagent Injector: --------------------- Http://Www.Thingiverse.Com/Thing:219281 Looks Just About Perfect. Parts List: ----------- Https://Docs.Google.Com/Spreadsheets/D/1Vqrxvlswpltabc5Txhsexb2C1_Wagtpsexas6M93Qz8/Pubhtml See Also: Https://Hackaday.Io/Project/4197-Reagent-Robot
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