jacky4566 / tinyparticlesupervisor

Using an ATTINY45 to control the enable pin on a 3rd gen particle.io board.

TinyParticleSupervisor

Using an ATTINYx4 with SpenceKonde/ATTinyCore to control the enable pin on a 3rd gen particle.io board. Keeps Real Time for only 6uA around 100ppm or worse.
ATTINY simulates I2C for two registers and controls a wake pin according to internal timers.

Wiring

Pin Mode	Function	Core Pin	ATTINYx4 PIN
OUTPUT	Control Particle EN pin	1	PA1
INPUT	Detect if Particle is awake	2	PA2
INPUT	I2C SDA	6	PA6
INPUT	I2C SCL	4	P4

Registers

All registers read and write 32 bit

I2C Address = 0x07

unixTimeRegister 0x01 (Increaments at 1HZ from WDT)

wakeTimeRegister 0x02

TODO:

• Add defines to support both ATTINYx5 and ATTINYx4
• Investigate alternate chips, ATtiny13A , perhaps STM32L0 for lower run power, RTC crystal, Proper I2C
• Add function to read VCC for boards without Power Good Signal