So I will start this off with I did use the search and found a lot of PID info, but not exactly what I was looking for. So by all means flame me relentlessly if this is a rinse and repeat.
I am building a small flowerpot electric smoker for my apartment balcony, and since I am a nerd I would like to do a PID temperature control. However, I don't just want one temp reading I want two.
Here is how I want this to go down.
2 thermocouples (TC) - 1 in meat 1 in airspace
2 alarms - 1 for meat 1 for airspace
scenario - I want the cooker to be at 200deg (airspace TC) until the meat TC detects 150deg. Once that happens I want the meat TC to override and keep meat temp at 150 deg with a max air temp of 205.
here is what I have in my head.....pure crazy.
2 PID's 1 for meat 1 for air - set one 200 one 150
2 relays - set up so BOTH need to be activated to turn on element.
seems like I could do this with a more complex PID that could do two thermocouples and 2 alarms and be much cheaper than this way over engineered setup I have listed above. Would cut me down to 1 pid, 1 relay, and 2 thermocouples.
Any advice from the more seasoned (pun intended) experts here would be great.