Through the thorns to the stars
Moderators: Head Monkey, kelvin, bigKam, skidesmond, chrismp
Whatever. I like it. Its easy to build something with shops around the corner and money no object. But to do it full diy out of stuff you have laying around or you can get its another thing. Keep on your journey!
P.s. depending on the programming of your temp controller (switch cycle and hysteresis) you propably want to switch from relay to ssr. Not sure how long a relay survives permanent switching of 2kw or so.
P.s. depending on the programming of your temp controller (switch cycle and hysteresis) you propably want to switch from relay to ssr. Not sure how long a relay survives permanent switching of 2kw or so.
Tom
Yes, we decided to make ssr in order to have automatic temperature control.mammuth wrote: P.s. depending on the programming of your temp controller (switch cycle and hysteresis) you probably want to switch from relay to ssr. Not sure how long a relay survives permanent switching of 2kw or so.
The problem is that we still have not seen it in action. Hope it will work properly.
We have two of them and probably we will put them somewhere near sidewall of snowboard between cassette. Or somewhere between aluminium sheets of upper and lower blanket. I do agree that is is a little bit big.mammuth wrote:I see a problem with your pt100 element. Its a little bit big (its a to- case, isnt it?). How do you plan to put it inside the sandwich?
appreciate your advice. I will look for that sensors in the market. Anyway we have to make our sensor cables longer, so we will have opportunity to put another sensors. But now I am a little confused if we will not find another types of sensors and where to put that we have now... we did not think about the size of indicators.mammuth wrote:I think you can convert your controller to J-Type (or K-Type) sensor, which is very small. There are some interface chips especially for that. Should be no big deal if you program it by yourself
Last edited by motoman on Thu Dec 03, 2015 12:36 pm, edited 1 time in total.
If you use a J-Type sensor all you need is J wires which you weld together at the tip (you can do that with a car battery). So you can make it as long as you wish and dia is 0.25mm or so. The only culprit, you need to use only this type of cable, you cannot extend it via a normal cable and if you want to use connectors in between you need special J-Type connector. Same for K-Type. Otherwise its quite cheap
Tom
You mean that welding of wires is done in order to connect sensor to wire?mammuth wrote:If you use a J-Type sensor all you need is J wires which you weld together at the tip (you can do that with a car battery).
Probably I have to read more about J type. Sensor seems pretty long...where to put it in sandwich?
J or K wire is based on a special metal. Before i try to explain it from memory look here:
https://en.wikipedia.org/wiki/Thermocouple
you just weld the end of the two cables (each wire is different metal imho) and this connection is your sensor
The smallest version looks like this:
http://at.rs-online.com/web/p/thermoelemente/6212142/
Just a cable with the ends welded together
As said, the cheapest version is to get this cables (10 meter roll or so, quite cheap), cut it to the length you need and weld the tip with help of a car battery (google it, there are some instructions/videos how to do).
To interface it to your controller you need a chip like that:
https://www.maximintegrated.com/en/prod ... 31855.html
You have to look which interface you need for your controller, from max you can get them with i2c, can,.... Also different sampling resolutions and so on.
This one is 8bit, 0.25 degrees resolution, 0..1024 degrees with spi interface: Thermocouple Amplifier Digital MAX6675
The only other piece you need is a capacitor.
Nice uh
https://en.wikipedia.org/wiki/Thermocouple
you just weld the end of the two cables (each wire is different metal imho) and this connection is your sensor
The smallest version looks like this:
http://at.rs-online.com/web/p/thermoelemente/6212142/
Just a cable with the ends welded together
As said, the cheapest version is to get this cables (10 meter roll or so, quite cheap), cut it to the length you need and weld the tip with help of a car battery (google it, there are some instructions/videos how to do).
To interface it to your controller you need a chip like that:
https://www.maximintegrated.com/en/prod ... 31855.html
You have to look which interface you need for your controller, from max you can get them with i2c, can,.... Also different sampling resolutions and so on.
This one is 8bit, 0.25 degrees resolution, 0..1024 degrees with spi interface: Thermocouple Amplifier Digital MAX6675
The only other piece you need is a capacitor.
Nice uh
Tom
The 6675 is eol.
The other one is around 7 Euros @ digikey. You have to search the datasheets which is avail and cheap.
https://para.maximintegrated.com/en/res ... 0Converter
The other one is around 7 Euros @ digikey. You have to search the datasheets which is avail and cheap.
https://para.maximintegrated.com/en/res ... 0Converter
Tom
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my remark about problem is not intended to you. If you read the board you should know what it's about.
There is no stupid questions and questions you asked me was not stupid and I never told you you're asking stupid questions. What I told you over six months ago and we'll repeated again right now... you should read this board.....what I told you it enough information out here to make skis/snowboards WITHOUT ASKING AMY QUESTIONS. what I told you at the time questions you are asked was discussed and explained recently and giving you a links to discussions apparently that wasn't enough
Nothing wrong asking questions. Wrong IMHO is expected others to do your homework
not intended to OP We need old MM back maybe even for short period of time lol
There is no stupid questions and questions you asked me was not stupid and I never told you you're asking stupid questions. What I told you over six months ago and we'll repeated again right now... you should read this board.....what I told you it enough information out here to make skis/snowboards WITHOUT ASKING AMY QUESTIONS. what I told you at the time questions you are asked was discussed and explained recently and giving you a links to discussions apparently that wasn't enough
Nothing wrong asking questions. Wrong IMHO is expected others to do your homework
not intended to OP We need old MM back maybe even for short period of time lol
I have not failed. I've just found 10,000 ways that won't work.
Thomas A. Edison
Thomas A. Edison
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