Electronics > Projects, Designs, and Technical Stuff
JBC-mini - a low cost T245 handle controller
cam:
Hi,
I actually own a JBC BT-2BWA which is the analog version of the CD-B. I am more into the analog one because I believe it is easier to set the temperature with it but unfortunately it doesn't has the temperature reading.
I googled around for infos about where to read this temperature so I could build a display (most likely with 7 digits displays) and guess what... I found your topic which looks the most detailed about the T245 pencil. First I'd like to thank you for sharing what you're building, it is well regarded as JBCs costs a lot but are THE soldering stations!
Now, I was wondering how you read the temperature from the connector? I didn't get much time to go through the design of a soldering station since I own a good one ;D
Your input would be much appreciated :-+ Thanks!
poorchava:
There is an mcp9700 temperature sensor on the PCB near the openocd for the connector. The sensor is THT so it may be mounted on the connector itself if need be (not sure what would the fastening metod be though).
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cam:
Thanks for the fast answer.
I'm not sure how it is supposed to work, MCP9700 seems to work from -40C to +150C.
How is it suppose to measure up to the 450°C the soldering station can do?
poorchava:
Umm, the MCP9700 is for cold junction compensation. The connector which is in the handpiece is not accounted for. I think that if we assume that all the contacts are at the same temperature and the emf generated across them is similar, then they will compensate one another. Also, the thermal isolation between heater and the contacts is excellent. I could have the tip at 350 deg.C and I could hold the other end of the cartridge with my bare hand it was only a bit warm.
Also, I don't think It very important for a soldering iron to be accurate to half a degree or something. I assumed that +/-5 degrees is perfectly fine.
Sent from my HTC One M8s using Tapatalk.
cam:
Thanks again for the fast answer :-+
Sorry I don't know much about this component I did not know about which made ask stupid question.
I looked at the datasheet and basically I just need to find a suitable uC with a ADC input to feed the 7 segments. it's just a matter of converting the Vout pin of the MCP9700 to binary. There is no compensation to take care of if I use the Vout pin of the MCP9700 because it is what is used for the regulation in JBC electronic card. Did I get it right?
Thanks again, your topic convinced me I can, without too much trouble, add a digital display on my station.
I'll post update later when I have time to work on it.
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