Recent content by gabir

  1. G

    Any advice on interfacing a K thermocouple?

    Dear All, Using webcontrol, I need to measure the temperature of my chimney stack, say up to 500F. A K-style analog thermocouple would do the job specs-wise but it is notoriously cranky to interface. Any product, advice, experiences or alternatives anyone may suggest would be most welcomed. Thanks.
  2. G

    Seed bed controller, the VeGITRoN

    Spring is coming and I am growing vegetables from seeds. One of the problems I always had with this operation is that when I use warming mats (which I put under the seed trays to warm them up) they usually get too hot, or not hot enough. I want to control the temperature exactly in two different...
  3. G

    Controlling house zones using a wood boiler

    I now have functioning code for this issue, which I have been testing through the winter. Simply restated, I have a wood boiler connected to two heating zones in my house, called newbasmnt and mainhouse. My contraints are as follows: 1) If there is no heat been produced by the boiler (no wood is...
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    Controlling house zones using a wood boiler

    Ross I see the point, especially as far as the real world is concerned... You are basically saying that even if very momentarily, as the code executes things may change state and it is better to collect all the state changes and execute them together at the end of each cycle. Correct?
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    Controlling house zones using a wood boiler

    @CAI_Support. Thanks again. I am starting to see some of the logic in the programming. When I write the subroutine what command branches off to the next logical step? say a subroutine checks for temperature in the boiler, if the temp satisfies I want to implement the next subroutine, if not I...
  6. Gabir

    Gabir

    control devices images
  7. webcontrol with 5v And relay

    webcontrol with 5v And relay

    CAI Webcontrol mounted with 5V power supply and 4 relays.
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    Controlling house zones using a wood boiler

    Hi Ross, I share with fwd03 being impressed. I have a similar setup, but I have no radiant floor. My production is 24 tubes solar, 140Kbtu wood, oil and the genset only for backup. Two storage tanks, about 500l. I am also impressed by the fact that you cogen at the level of generator exhaust...
  9. G

    Controlling house zones using a wood boiler

    thanks. the heathsink sounds like a good idea. Here is the clarification. Point 1 refers to the ambient temperature in any of the zones. Point 2 refers to the temperature of the water in the boiler. If the temperature of the boiler is too low, then there is no point for any of the pumps to...
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    Controlling house zones using a wood boiler

    Another question... :blink: I am using 4 very small 5V ttl coil relays, which are so far powered by pin 13, ground and each triggered by their respective ttl ouputs (1-4). Each needs 15-20mA driver current. I am using an 8.5 V 1.5 A power supply to power the webcontrol. The question is what...
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    Controlling house zones using a wood boiler

    Thanks. The ranges are within the specs of the DS18B20 (–67°F to +257°F). For the zones: 40 to 80 F. For the boiler the low setpoint should be around 60F and the high setpoint at about 180F. I have the webcontrol wired in and I am logging the temps to that effect. It is very...
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    Controlling house zones using a wood boiler

    Hi, firstly let me say that I am quite impressed with webcontrol even if I am not a programmer and I am learning the basics of PLC. I have a new mission for it, so explained. I used a dual fuel boiler, to heat my house, oil and wood. Teh boiler heats waer which is then pumped to radiators around...
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