HumTempNode

Extending the Arduino's Battery life

To be able to use the arduino with a coin cell battery, some steps are needed:

Burn 1MHz ATMega328P 1MHz Bootloader with 1.8V BOD from MiniCore.

Unsolder on-board voltage regulator and power LED (You can keep the built-in LED in pin 13, it's useful for debugging).

For this sensor I used the 5V variant of the Arduino Pro mini, but the 3.3V one should work as well (Maybe even better!).

ID	Name	Designator	Footprint	Quantity
1	Male header 1x10	J1	H10-2.54	1
2	CR2032 holder	B2	CR2032 SMD HOLDER	1
3	Capacitor 10uF	C1	CAP5X7	1
4	Capacitor 220uF	C2	CAP-D6.3XF2.5	1
5	Arduino Pro Mini	U1	ARDUINO_PRO_MINI	1
6	SI7021	S1	SI7021 MODULE	1
7	AS01-ML01S	MK1	NRF24L01_SMD+	1

Name	Size	# Downloads
Gerber_TopSilkLayer.GTO	148.61 kB	338
Gerber_TopPasteMaskLayer.GTP	709 B	285
Gerber_BoardOutline.GKO	496 B	291
Gerber_TopLayer.GTL	5.57 kB	331
Gerber_Drill_PTH.DRL	1.57 kB	328
Gerber_BottomLayer.GBL	125.22 kB	337
Gerber_BottomSilkLayer.GBO	14.36 kB	337
Gerber_BottomSolderMaskLayer.GBS	1.41 kB	315
Gerber_TopSolderMaskLayer.GTS	2.52 kB	321

Name	Size	# Downloads
HumTempNode.ino	11.15 kB	507

Revision	Created	Layers	Dimensions
rev2	5 years ago	2	35 × 65
rev1	5 years ago	2	35 × 65

NeverDie commented 5 years ago

Nice job!

Have you looked into some of the other MCUDude offerings, like mightyCore, megaCore, or megaCoreX? I get the impression that at least one person has cracked how to use the improved bootloader you referenced to do over-the-air firmware updates, and it would be great to find a working example (for an MPU with, say, at least twice the amount of flash as the atmega328p) where someone has done so. That it could all be done easily within the Arduino IDE, as the MCUDude bootloader plus MCUDude Arduino-like libraries appears to allow, would be a huge plus, as it would appear to allow code migration to a vast collection of new MCU's (the ones encompassed by MCUDude) with little to no effort.

Is that right, or is there a gotcha that I've overlooked?

Extending the Arduino's Battery life

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