Project-GlassKilnController
hi everyone,
earlier asked wood stove controllers, , showed working examples of reading high temperatures thermocouples (here). i'm still working on project has taken priority.
the more complex project design , construction of electrically-heated kiln making "warm glass", glass heated until pieces fuse or "slump" or "drape" on shaped molds. requires careful profile of kiln temperature on multi-section sequence of heating, "soaking" @ high temperature, rapid cooling intermediate temperature, annealing stabilize stresses, , cooling room temperature.
i feedback on see on project progress far. comments/suggestions/critique welcome. trying make project description page show techniques of construction of system this. it's big step many people go desktop prototype packaged system, , many questions (and see many here) problems in making more complex system. there both electrical challenges common ground point , mechanical challenges cutting rectangular holes accurately in metal. then there's mounting/packaging arduinos , many peripheral modules. , cabling. i'd appreciate comments/suggestions/critique on aspect: practical example of making stuff this. lately have been making kits , writing how-to relative newbies , younger people, , it's been while since i've done project this.
so, my project page here , hope may have time over.
and have stuff don't know how yet, , i'm asking suggestions/pointers:
- active multi-level temperature control use brett's great arduino pid library. getting understand little, specific situation requires not pid approach single temperature, control follows needed profile of temperature rate-of-change. think it's "do pid next intermediate setpoint in next minute, go next setpoint along profile path". or that. anyone seen example of doing kind of control??
- need initiate read of small text file on pc buffer in arduino mega. didn't find example of yet? seen one??
- have seen/done datalogging. here need logging on several hours, , nice graphing on pc of temperature vs time. pointers??
- keep backing critical parameters including "where in firing schedule sequence am" hope of being able recover crash without destroying product in process. assume can save kind of information in eeprom memory. anyone seen example(s) of crash/recovery/restart function?
i put codeofthemoment on page here
so far quite bit of stuff working. 1 temporary disaster attempt made use couple of small optically-isolated 30a relays turn main 240v power on , off. i have main power cable (8-3 copper) wired 50 amp outlet use welder , plasma cutter. hmmmm... go wrong? last night after dark plugged big plug in , flipped 50 amp breaker. blam!! flash!! lights went out!! jeezum crow! (a vermontism).. stumbled blindly shop door knew backup flashlight was. got it. unplugged project. no lights on in house @ all. hmmm.. went main breaker panel. main breaker on (cycled it) no lights. doggone! there 100 amp breaker, out on power pole. in locked box. in snow. fortunately had compulsively marked , tagged , hung key next panel. flashlight out door, through snow, unlock box, cycle breaker.. lights!!
this spectacular failure i've had in past 20 years. impressed wife, too.
i read modern project management , agile development. "fail early" 1 idea. got that. little relay way overdone toast. have real 1 coming digikey.
***update*** removed toast , put in temporary fuseblock 2 1/2 amp fuses. plugged big cord in.. .. flipped breaker and.. pilot lights came on, power monitor showed 242 volts @ 0.12 amps , little (failsafe) temperature controller came up. complained thermocouple bad(gone) made quick 6 inch long 1 propane torch , hammer weld. ok now..
earlier asked wood stove controllers, , showed working examples of reading high temperatures thermocouples (here). i'm still working on project has taken priority.
the more complex project design , construction of electrically-heated kiln making "warm glass", glass heated until pieces fuse or "slump" or "drape" on shaped molds. requires careful profile of kiln temperature on multi-section sequence of heating, "soaking" @ high temperature, rapid cooling intermediate temperature, annealing stabilize stresses, , cooling room temperature.
i feedback on see on project progress far. comments/suggestions/critique welcome. trying make project description page show techniques of construction of system this. it's big step many people go desktop prototype packaged system, , many questions (and see many here) problems in making more complex system. there both electrical challenges common ground point , mechanical challenges cutting rectangular holes accurately in metal. then there's mounting/packaging arduinos , many peripheral modules. , cabling. i'd appreciate comments/suggestions/critique on aspect: practical example of making stuff this. lately have been making kits , writing how-to relative newbies , younger people, , it's been while since i've done project this.
so, my project page here , hope may have time over.
and have stuff don't know how yet, , i'm asking suggestions/pointers:
- active multi-level temperature control use brett's great arduino pid library. getting understand little, specific situation requires not pid approach single temperature, control follows needed profile of temperature rate-of-change. think it's "do pid next intermediate setpoint in next minute, go next setpoint along profile path". or that. anyone seen example of doing kind of control??
- need initiate read of small text file on pc buffer in arduino mega. didn't find example of yet? seen one??
- have seen/done datalogging. here need logging on several hours, , nice graphing on pc of temperature vs time. pointers??
- keep backing critical parameters including "where in firing schedule sequence am" hope of being able recover crash without destroying product in process. assume can save kind of information in eeprom memory. anyone seen example(s) of crash/recovery/restart function?
i put codeofthemoment on page here
so far quite bit of stuff working. 1 temporary disaster attempt made use couple of small optically-isolated 30a relays turn main 240v power on , off. i have main power cable (8-3 copper) wired 50 amp outlet use welder , plasma cutter. hmmmm... go wrong? last night after dark plugged big plug in , flipped 50 amp breaker. blam!! flash!! lights went out!! jeezum crow! (a vermontism).. stumbled blindly shop door knew backup flashlight was. got it. unplugged project. no lights on in house @ all. hmmm.. went main breaker panel. main breaker on (cycled it) no lights. doggone! there 100 amp breaker, out on power pole. in locked box. in snow. fortunately had compulsively marked , tagged , hung key next panel. flashlight out door, through snow, unlock box, cycle breaker.. lights!!
this spectacular failure i've had in past 20 years. impressed wife, too.
i read modern project management , agile development. "fail early" 1 idea. got that. little relay way overdone toast. have real 1 coming digikey.
***update*** removed toast , put in temporary fuseblock 2 1/2 amp fuses. plugged big cord in.. .. flipped breaker and.. pilot lights came on, power monitor showed 242 volts @ 0.12 amps , little (failsafe) temperature controller came up. complained thermocouple bad(gone) made quick 6 inch long 1 propane torch , hammer weld. ok now..
thermal ramps used in pcb reflow soldering, , i've seen few diy examples toaster ovens. this one arduino compatible. here open source example code.
spoils fun, can buy little pid process controllers thermal ramps, cheaply on ebay. that, thermocouple , maybe ssr need small kiln. example:
http://www.ebay.com/itm/pid-temperature-controller-with-30-steps-ramp-soak-option-/132034883168?hash=item1ebde46e60:g:shuaaoswcfdxpk41
spoils fun, can buy little pid process controllers thermal ramps, cheaply on ebay. that, thermocouple , maybe ssr need small kiln. example:
http://www.ebay.com/itm/pid-temperature-controller-with-30-steps-ramp-soak-option-/132034883168?hash=item1ebde46e60:g:shuaaoswcfdxpk41
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