Kansas Temp Controller, Flashed w/ STC-1000+, Fahrenheit Display

[alphaomega]

As far as the transformer goes, if you half the input you will half the output. The relay circuit is getting ~6VDC . I have replaced the relays and it has been working without issue.

Ah, I see... That is pretty clever
I think the 5v regulator is a simple linear one and at around 6v, it might be cutting it close to dropout, but if it works reliably then if anything, you should spare the regulator a bit.

 

[pointcity-homebrew]

I was worried about the 5V regulator at first. The voltage coming from the secondary voltage is close to 7V, so I am right on the edge of dropout I believe. I have not had any issues and the unit has been running great on bench testing.

Replacing the transformer is expensive compared to the relays, which I got for ~.50 each. This is a fun little controller to play around with I have added a tri color LED to make it easy to see which output is active, at a glance. I commend you on your program as well. When/ if I put these on ebay I will make sure to donate some of the proceeds to charity.

 

[alphaomega]

I was worried about the 5V regulator at first. The voltage coming from the secondary voltage is close to 7V, so I am right on the edge of dropout I believe. I have not had any issues and the unit has been running great on bench testing.

I'm no expert but I believe a regular 7805 needs around 6v on the input side, so if it is closer to 7v it should be fine.

Replacing the transformer is expensive compared to the relays, which I got for ~.50 each. This is a fun little controller to play around with I have added a tri color LED to make it easy to see which output is active, at a glance.

Absolutely. And yes, I've come to really like these little suckers myself. If I could have made any changes to it, I'd like to have seen at least a one up on the MCU and a full digit in the leftmost place on LED display. But really, they are very good at the cost. Very robust and thought through design.

I commend you on your program as well. When/ if I put these on ebay I will make sure to donate some of the proceeds to charity.

Thank you! That would be awesome, much obliged!

 

[pointcity-homebrew]

I have been working on a Atmega based controller using DS18B20 temp sensors. I need to get back on it, being summer I have had to keep the yard up and such so I have not had much free time for tinkering.

 

[wilconrad]

Closing this thread as it is no longer relevant to the 'For Sale' category. Please continue the discussion on this thread.

Thanks,
Will