ATtiny2313 - Based Thermostat Project Update #2

ATtiny2313 - Based thermostat project update #2.
First revision of firmware is finished. Plus a little explanation on temperature hysteresis and thermal capacitance.

Category:

Science & Technology

Tags:

• thermostat
• project
• electronic
• relay
• attiny
• avr
• microcontroller
• mcu
• update
• diy
• eagle
• transformer
• phil
• levchenko
• jumperone
• fix
• do
• it
• yourself
• electronics

[kchiem]

You could damage your equipment if it's cycled on/off too often. I think my honeywell thermostats have a limit of 5 on/off cycles per hour.

[JumperOneTV]

@kchiem I guess if it would be switched on and off too often, the relay would wear-off much quicker and it would be not too good for household power grid. I guess, I'll set the hysteresis lower limit to 0.3 degrees C. And maybe add the check for number of on/off cycles per hour, if I'll find any space.

[frac]

You might want to give assembly language a try - even if you don't complete it. On a simple chip like that, it's really quite fun and easy. Not to mention efficient. You might be surprised how roomy 2K suddenly seems.

[JumperOneTV]

@frac I've used asm before, but it takes too much time to write firmware, compared to C. If it would've been commercial project, I would've use assembly language, but I think in my case it's not worth it.

[Nathanxiangdarby]

Need more tutorials....

[cd4600]

Instead of laminating a piece of paper, you could color laser print on transparencies, wouldn't that work better? Nice video, great explanations!

[orbiter8]

Great looking project Phil. Works very well too. Nice job

[BulletMagnet83]

This has been an interesting project to follow. I've been looking into building something similar myself, hopefully in time for next year's growing season (chilli peppers, not weed :P ). Although with mine I intend to use an RTC chip to time-switch some relays for lighting too... I would have completely forgotten about temperature hysteresis had I not watched this vid :-)

[BulletMagnet83]

@kchiem once I saw it... :-))

[silverstream314]

@kchiem That's why he uses hysteresis to have some tolerance between turn on and turn off.

[kchiem]

O RLY ?