Battery based atmega328p sensor (no SMD)

[alexsh1]

@GertSanders said:

@alexsh1 said:

26650

Fully charged these batteries are 4.2V, which is too high for the radio. In terms of cost, they require a special Li-Ion battery loader. Cutout voltage is aroud 2.5V. Capacity wise they would allow a node to work 3 years. Personally I'm happy with something over 1 year at 10th of the cost.

Well, not exactly. Have a look here: http://forum.mysensors.org/topic/3309/powering-nodes-3-3v-with-18650-26650/7
The cost of LDO is about Eur 1 for 20 pieces including shipping from HK :)
No charger is needed (and I have one away) -> TP4056 with Battery protection is the answer. Just plug it into the USB to charge. The cost is Eur 2-3. The only cost here is battery itself. With PCB it is around Eur 10 vs 2xAA (or 2xAAA), which is what? Eur 4-5? Fine, but this is rechargeable and you can use it in other projects.

[scalz]

@GertSanders : nice board and concept :) in my latest mytinycamel (I re-routed it recently) I have mysxconnector and 3xi2c , 24x49 but 0603 smd...and on this one radio module is on bottom...(I would like it on top but mytinycamel is a little bit room eater..but it's a cool power sequence so for fun!) I will try to upload it (and other stuff) maybe this week-end. I have routed something for lora too...32bits ;), still smd..
@alexsh1 : I think it's a matter of taste :) for instance, mytinycamel (my board) is not so expensive, and I can use only one 1.5v AA or AAA and last for years! put two in //, or don't ask me with a cheap lr14 type C 8000mah I have not tested yet lol! primary batt (aa/aaa/C) are cheap, in lithium version very low self discharge..not rechargeable but you have very often an aa/aaa batt somewhere ;) dilemma everywhere!

[alexsh1]

@scalz LR14 Type C is a huge battery. 26650 is not. Though I agree it is a matter of taste/view. I have been using 18650/26650 to power up some projects and they performed well and universal - can be recharged and used for a power hungry projects and in my torch.

[scalz]

@alexsh1 : lr14 diam 25.5 and length 49.5. 26650 is 26x 67...so lr14 is smaller (but need a switch reg). I agree too, 26650 is a nice rechargeable one for hungry projects ;)

[alexsh1]

@scalz You are right re size - perhaps I was comparing it with type D. However, in terms of capacity, would you get a proper 5,000 mAh (not Trustfire capacity lol) out of lr14? We are not comparing apples with apples here as 26650 is 3.7V (and not 1.5V)

For super power demanding projects I use this one:
http://www.gearbest.com/rc-model-accessories/pp_143333.html?currency=GBP&gclid=CNupk7T0pMsCFcO4GwodKFAO6g

[alexsh1]

BTW, for projects now I'd favour AA sized 3.2V LiFePo4 (1 battery) or AA-sized 1.6V NiZN (2xbatteries) or AA-sized 1.5V Lithium rechargeable (2xbatteries)

This is concerning 3.3V power supply obviously.

[scalz]

@alexsh1 : cool :) not comparable, I know, lol..I just wanted to share other alternatives (26650 sized) as lr14 are very cheap in pack and can last very long time (with a booster 0.7v-1.5 to 3V) and you always have 3v during the whole life, can use every drop of power. but booster is not the best efficient for big hungry application. other 9v batt are nice too ;) and lipo can vent or good quality are expensive (good quality = true mAh, secure and low selfdischarge. but as you said it's rechargeable). And I am designing a lipo node too so.. :)
sorry for ot ..

[alexsh1]

@scalz I suggest we move this discussion to http://forum.mysensors.org/topic/3309/powering-nodes-3-3v-with-18650-26650/2

6 x 1.5V LR14 on Amazon are £7 meantime 26650 3.7V 5000mAh is £9. Obviously one needs 2 for a project so its it £2.2 vs £9, but I am looking at it from a different angle. 26650 is a universal buy for me as well as an investment - I can power a project with, say, a motor or solenoid or connect a solar panel to charge the battery.
This is just my 2 cents

[GertSanders]

This post is deleted!

[alexsh1]

@GertSanders I really like this board - you are getting better and better! :)
You have now EEPROM? And the LED now on D5? You really like changing LED pin. :)

Somebody was asking for PIR on the slim node.
Well, another teaser from me using previous version of your board (AA battery compartment and I am altering STL file to have it also for AAA battery case).

[alexsh1]

@GertSanders What are you planning to use for SJ4 and SJ5? Soldering or switches? I was thinking about the following:

http://www.aliexpress.com/item/50pcs-lot-Micro-Switch-Button-On-Off-Switch-Tact-Push-Button-Switch/32386813536.html?spm=2114.10010108.1000013.1.Za0nJ0

[GertSanders]

@alexsh1
SJ4 and SJ5 are solderingpads. I find that I do not change the function of the node once it is set up. No point in using switched, when the switch action only happens once.

[alexsh1]

@GertSanders i know you have not done testing but can you give up heads up when you share it on oshpark - very keen to test it myself. Dank je

[GertSanders]

@alexsh1

Some pins moved again. I have not yet ordered this, I normally sleep on it for a few days, then check again, and if I feel OK that no more details need to move, I will trigger an order and share. I'll let you know when that happens.

I'm still wondering whether I should put soms test-pads in place, to allow ISP programming of a bootloader after the mcu is put in place. It would require some round test-pads on the bottom. I will think about this tomorrow after I have slept on it.

UPDATE: found a small error in my schematic: C10 is not needed. So rerouting will be needed, I want this location for something else.

[GertSanders]

@alexsh1

board is ordered and shared from OSHPark: https://oshpark.com/shared_projects/2uuSjIIQ

[alexsh1]

@GertSanders said:

@alexsh1

board is ordered and shared from OSHPark: https://oshpark.com/shared_projects/2uuSjIIQ

Thanks for this! Can you please share the BOM file?
I placed my order already!

[GertSanders]

@alexsh1

I will add it on OpenHardware.io

[GertSanders]

@alexsh1
In what capacity do you get the AA size LiFeP4 batteries ?

[alexsh1]

@GertSanders said:

@alexsh1
In what capacity do you get the AA size LiFeP4 batteries ?

@GertSanders
OK, I have a couple of 14500 LiFeP4 3.2V each. They are only 600mA. They are not my favourite though. I also have (1) lithium rechargeable AA 1500mA 1.5V (charging 5V from USB) and (2) NiZn AA 1.6V 2200mA - these are my favourite so far.

The problem for me is that my new charging device has not arrived yet from China and I cannot charge NiZn. I have discharged a few and did not a chance to charge them

[gloob]

Is there a case/housing available instead of printing an own one?