Powermanagement for RPI

ATtiny85 as Powermanagement chip for RPI

functions:

• press push button for 1 second to switchON relais and rpi will boot
• press push button for 3 seconds to initiate clean shutdown, after 10 seconds Relais will switchOFF 5V power
• service script 'shutdownbutton', simulates a 3 second button press, if OS command shutdown -h was executed (no push button was pressed)
• status BiColor LED (red/green)

If you want to add functionality, you can modify .ino source code and compile it with Arduino IDE to generate new .hex file

Video:

video shows switchON, boot, ... , shutdown and switchOFF. (Installed in a prototype device).

Schematic:

Install shutdownbutton as a service

apt -qy install raspi-gpio 
#
cd /usr/local/sbin
wget -N https://raw.githubusercontent.com/rudiratlos/RPI_PowerMgmt/master/shutdownbutton
chmod +x shutdownbutton
#
/usr/local/sbin/shutdownbutton install
#
# finally reboot
reboot

Install avrdude

apt update
apt -qy install avrdude
#
cd /usr/local/sbin
wget -N https://raw.githubusercontent.com/rudiratlos/RPI_PowerMgmt/master/RPI_ShutDownReboot.hex
wget -N https://raw.githubusercontent.com/rudiratlos/RPI_PowerMgmt/master/avrdude.sh
chmod +x avrdude.sh

Burn ATtiny85 with avrdude

connect a stk500V2 compatible AVR programmer on rpi USB port

avrdude.sh

use .hex file directly to flash ATtiny85 avrdude.sh shellscript uses avrdude as flashing utility.