Push-Button-On-Off-Control-ATtiny13/25/45/85

Smart Power ON/OFF Button: #173-ATTiny85-Push-Button-On-Off-control

Initial Development by Ralph S Bacon: https://youtu.be/S2y1oAVmxdA

Reference to Ralph's project: https://github.com/RalphBacon/173-ATTiny85-Push-Button-On-Off-control

Creatively modified algorithm, introduced a Finite-state Machine and ported to ATtiny13.

Supported uControllers: ATtiny13/13A/25/45/85

Environment: MicroCore, 600kHz internal clock (also set up by fuses), BOD disabled, Micros enabled Size with both ExternalControl and Sleep features: 842 bytes / 32 bytes -> great for Attiny13 !

100% compatible at firmware level if compiled for ATtiny25/45/85!

Incompatible with the original author's solution at pins/PCB level because ATtiny13 and ATtiny25/45/85 have different pins for INT0 interrupt:

ATtiny85/45/25 - PB2 ATtiny13 - PB1

thus, I shifted POO button pin from PB2 to PB1 and LED pin from PB1 to PB0

                      ATtiny13A
PIN 1 Reset             +-\/-+
                PB5 - 1 |*   | 8 - VCC
KILL pulse  <-> PB3 - 2 |    | 7 - PB2       -> debug only: serial out
PowerOn/Off  <- PB4 - 3 |    | 6 - PB1(INT0) <- input: Power On/Off Button
                GNG   4 |    | 5 - PB0       -> output:Power LED (optional)
                        +----+


                    ATtiny25/45/85 
PIN 1 Reset             +-\/-+
                PB5 - 1 |*   | 8 - VCC
KILL pulse  <-> PB3 - 2 |    | 7 - PB2 (INT0) <- input: Power On/Off Button  
PowerOn/Off  <- PB4 - 3 |    | 6 - PB1        -> output:Power LED (optional)
                GNG   4 |    | 5 - PB0        -> debug only: serial out
                        +----+

Can be also compiled for Atmega328 just for test purpose (without sleep function).

Modfications Log:

• Re-done re-code application algorithm using a Finite-state Machine Concept: https://en.wikipedia.org/wiki/Finite-state_machine
• Ported to ATtiny13A microController; MicroCore environment
• Added SLEEP_MODE_PWR_DOWN for extremely low power consumption (important for gadgets run on batteries)
• Added an option of initiating a power off procedure by main microController (uC) by sending a "Power Off" request pulse to KILL_PIN bus
• Added a new feature: if PowerOnOff button is pressed and released followed with no confirmation from the main uC, then it gets back to ON_STATE after a short tomeout and start-up delay; Essentially, it becomes ready to the next attempt for Power Off or Emergency Shutdown

EasyEDA PCB links:

EasyEDA links to universal PCBs (compatible with ATtinny13/25/45/85):

• Small SOT23 MOSFET AO3401A, up to 4A load: https://easyeda.com/Sergiy/smart-power-switch-attiny13
• Dual SOIC-8 MOSFET AO4606, up to 6A load: https://easyeda.com/Sergiy/smart-power-switch-attiny13_copy_copy
• Powerful SOIC-8 MOSFET AO4407A, up to 10A: https://easyeda.com/Sergiy/smart-power-switch-attiny13_copy

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