Talk:Freezer to Refrigerator Conversion - Revision history

Eric: Added some Ideas I had

2021-03-28T02:38:17Z

Added some Ideas I had

← Older revision		Revision as of 02:38, 28 March 2021
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	=Links=		=Links=
	*[https://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ HackaDay How to Debounce Noisy Buttons in Hardware and Software] search page for thermostats for relevant info. Simplification of circuits so no arduino is needed might enable use of CNC circuit mill if it is simple enough for single or double sided PCB to be used.		*[https://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ HackaDay How to Debounce Noisy Buttons in Hardware and Software] search page for thermostats for relevant info. Simplification of circuits so no arduino is needed might enable use of CNC circuit mill if it is simple enough for single or double sided PCB to be used.

			----

			I defrosted one of those "mini fridge-freezer combos" today (it seems like none have auto-defrost sadly, and most neglect to do the advised maintenance to prevent the coils icing over)

			I remembered this project and it got me thinking if this, or something similar could be used to convert a non-self defrosting one into a self defrosting machine.

			I don't remember if they do it via reversing the heat pump and/or via just turning it off until the ice melts

			Either way it would be a neat application, or at least similar project

			--[[User:Eric\|Eric]] ([[User talk:Eric\|talk]]) 2:38, 28 March 2020 (UTC)

Marcin at 02:04, 12 March 2019

2019-03-12T02:04:24Z

← Older revision		Revision as of 02:04, 12 March 2019
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			=Compiling Errors=
			Using Ubuntu 16.04 and Arduino 1.6.8, we have

			<nowiki>sorry - this program has been built without plugin support
			exit status 1
			Error compiling for board SparkFun Pro Micro.
			</nowiki>
	=math=		=math=

AbeAnderson at 23:36, 17 January 2019

2019-01-17T23:36:47Z

← Older revision		Revision as of 23:36, 17 January 2019
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	*with a WiFi enabled microcontroller, could possibly remote control/monitor an air conditioner window unit. Could also schedule run times.		*with a WiFi enabled microcontroller, could possibly remote control/monitor an air conditioner window unit. Could also schedule run times.
	**would need to make sure air conditioner start up routine doesnt require button press.		**would need to make sure air conditioner start up routine doesnt require button press.

			=Wear and longevity=

			*https://diy.stackexchange.com/questions/5990/what-are-the-rules-for-unplugging-a-refrigerator

			In general, the way the freezer is being used for lower duty cycle should reduce wear and frequent cycling.
			I recall from electronics hearing about refrigeration engineers spending a lot of effort on timing inductive circuits to minimize arcing and maximize the MTBF of the mechanical relays, but the quality of those may have increased in the last couple decades. So, it is questionable what wear external power control might increase.

			I see the triggers are set far apart in the code, but I wonder what are common times between cycles?
			Is there any case when frequent cycling could occur? Component failure modes? There is nothing in code currently to prevent it, but if needed the on/off timing should be easy to do in code alone.

	=Links=		=Links=
	*[https://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ HackaDay How to Debounce Noisy Buttons in Hardware and Software] search page for thermostats for relevant info. Simplification of circuits so no arduino is needed might enable use of CNC circuit mill if it is simple enough for single or double sided PCB to be used.		*[https://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ HackaDay How to Debounce Noisy Buttons in Hardware and Software] search page for thermostats for relevant info. Simplification of circuits so no arduino is needed might enable use of CNC circuit mill if it is simple enough for single or double sided PCB to be used.

Marcin: /* math */

2019-01-17T20:03:43Z

math

← Older revision		Revision as of 20:03, 17 January 2019
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	~~thermister~~ =		==thermistor ==

	:10K Ohm @ 25 ~~celcius~~		:10K Ohm @ 25 celsius
	:20.13 @ 5		:20.13 @ 5 C
	:24.30 @ 0		:24.30 @ 0 C

	==voltage ~~devider~~==		==voltage divider==

	Vout = (R2/(R1+R2)) x Vin		Vout = (R2/(R1+R2)) x Vin

	:24.3 Ohm -> 0.962V		:24.3 Ohm -> 0.962V = 0 C
	:24 Ohm -> 0.97V		:24 Ohm -> 0.97V => (24.3-24)/(24.3 - 20.13) * 5 = 0.4 C assuming linear resistance of thermistor
	:21 Ohm -> 1.06V		:21 Ohm -> 1.06V => (24.3-21)/(24.3 - 20.13) * t = 4 C

	==Analog to Digital Converter==		==Analog to Digital Converter==
Line 35:		Line 35:

	:24.3 Ohm = 298.25 = 0 C		:24.3 Ohm = 298.25 = 0 C
	:24 Ohm = 300.88		:24 Ohm = 300.88 = 0.4 C
	:21 Ohm = 329.99		:21 Ohm = 329.99 = 4 C

	= Relay Trigger Voltage =		= Relay Trigger Voltage =

AbeAnderson: /* Links */

2018-10-23T21:47:22Z

Links

← Older revision		Revision as of 21:47, 23 October 2018
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	=Links=		=Links=
	*[https://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ HackaDay Debounce Noisy Buttons in Hardware] search page for thermostats for relevant info. Simplification of circuits so no arduino is needed might enable use of CNC circuit mill if it is simple enough for single or double sided PCB to be used.		*[https://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ HackaDay How to Debounce Noisy Buttons in Hardware and Software] search page for thermostats for relevant info. Simplification of circuits so no arduino is needed might enable use of CNC circuit mill if it is simple enough for single or double sided PCB to be used.

AbeAnderson at 21:45, 23 October 2018

2018-10-23T21:45:54Z

← Older revision		Revision as of 21:45, 23 October 2018
Line 75:		Line 75:
	*with a WiFi enabled microcontroller, could possibly remote control/monitor an air conditioner window unit. Could also schedule run times.		*with a WiFi enabled microcontroller, could possibly remote control/monitor an air conditioner window unit. Could also schedule run times.
	**would need to make sure air conditioner start up routine doesnt require button press.		**would need to make sure air conditioner start up routine doesnt require button press.

			=Links=
			*[https://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ HackaDay Debounce Noisy Buttons in Hardware] search page for thermostats for relevant info. Simplification of circuits so no arduino is needed might enable use of CNC circuit mill if it is simple enough for single or double sided PCB to be used.

Dorkmo: /* To Do */

2018-10-23T02:37:25Z

To Do

← Older revision		Revision as of 02:37, 23 October 2018
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	*Set 50% point on both knobs as 36 fahrenheit		*Set 50% point on both knobs as 36 fahrenheit
	**Max knob turn adds 5, Min turn subtracts 5.		**Max knob turn adds 5, Min turn subtracts 5.

			or could have pot#1 set the mid point and pot#2 change the allowed range

	= Other Aplications =		= Other Aplications =

Dorkmo: /* Potentiometers to dial in HI and LO temp */

2018-10-23T02:36:15Z

Potentiometers to dial in HI and LO temp

← Older revision		Revision as of 02:36, 23 October 2018
Line 64:		Line 64:
	**might need a plain resistor between the digital out and pot		**might need a plain resistor between the digital out and pot
	***calculate for max 30mA at either 3.3 or 5v		***calculate for max 30mA at either 3.3 or 5v
			*Set 50% point on both knobs as 36 fahrenheit
			**Max knob turn adds 5, Min turn subtracts 5.

	= Other Aplications =		= Other Aplications =

Dorkmo: /* Potentiometers to dial in HI and LO temp */

2018-10-23T02:23:33Z

Potentiometers to dial in HI and LO temp

← Older revision		Revision as of 02:23, 23 October 2018
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	*https://forum.arduino.cc/index.php?topic=382157.0		*https://forum.arduino.cc/index.php?topic=382157.0
			*http://forum.arduino.cc/index.php?topic=94740.0
	*https://www.arduino.cc/en/tutorial/potentiometer		*https://www.arduino.cc/en/tutorial/potentiometer

Dorkmo: /* Potentiometers to dial in HI and LO temp */

2018-10-23T02:22:51Z

Potentiometers to dial in HI and LO temp

← Older revision		Revision as of 02:22, 23 October 2018
Line 57:		Line 57:
	*https://forum.arduino.cc/index.php?topic=382157.0		*https://forum.arduino.cc/index.php?topic=382157.0
	*https://www.arduino.cc/en/tutorial/potentiometer		*https://www.arduino.cc/en/tutorial/potentiometer

			===To Do===

			*might try using Digital out pins to send voltage to Pots
			**might need a plain resistor between the digital out and pot
			***calculate for max 30mA at either 3.3 or 5v

	= Other Aplications =		= Other Aplications =