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Temperature control (time based variations), alarm and motor controller — Parallax Forums

Temperature control (time based variations), alarm and motor controller

brian111brian111 Posts: 2
edited 2007-03-12 22:29 in BASIC Stamp
I need to put together a basic stamp system that has the following functions:

1. Water temperature probe circuit

2. Water chiller relay controlled by temperature circuit and programmable time circuit

3. Alarm relay controlled by temperature probe circuit (high and low temperature alarm)

4. electric motor relay controlled by alarm circuit (normally closed, opened when alarm activates from high or low water temperature

It would be ideal to have the system controlled by usb or wifi interface.

Any ideas out there?

Thank you, Brian

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2007-03-09 19:38
    Have a look at the tutorials on the Stamps in Class page of the Parallax website. They have a lot of information on industrial control. Also, check out Tracy Allan's website for sensor suggestions at www.emesystems.com. The Nuts and Volts articles available for download have examples of timekeeping.

    You'll need transistors (probably MOSFET) to switch the relays. Make sure you have a back-EMF protection diode. Many power MOSFETs have them built-in.

    You can use the USB2SER interface to provide a USB-serial connection to a PC for control. There are some WiFi interfaces available for embedded systems, but they're complex to work with, both from the Stamp and PC's standpoint. Have a look at Parallax's PINK internet-Stamp interface. It's not wireless, but can be connected to a WiFi bridge.
  • brian111brian111 Posts: 2
    edited 2007-03-09 20:01
    Thank you Mike, I'll run with this information. I'm very new at dabbling with this equipment. I appreciate the info.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-03-09 22:27
    Hello,

    At the following link there is some code I posted some time ago for a Digital Thermostat I had designed back in NY which controls a furnace based on current temperature VS set temperature. The set temperature can also dynamically change based on a schedule programmed in and using the DS1302. I hope this helps. Take care.

    http://forums.parallax.com/showthread.php?p=601101


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    Chris Savage
    Parallax Tech Support
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-03-12 22:29
    Also, due to popular demand the Solder Pot Controller code has been posted at the following link which may be use to you. I hope this helps. Take care.

    http://forums.parallax.com/showthread.php?p=637023

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    Chris Savage
    Parallax Tech Support
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