Description

This script monitors the battery voltage, battery charge current and a GPIO pin.

• If battery is low and not charging, or
• the pin is pulled down (GND) it initiates a shutdown.

Installation

1. clone repository to your C.H.I.P. device

    # If not changed: default username "chip" and password "chip".
    ssh chip@<your-device>
    cd
    git clone https://github.com/rubienr/chip.git
   

2. automatically start it from /etc/rc.local

    #!/bin/sh -e
    #
    # rc.local
    #
    # This script is executed at the end of each multiuser runlevel.
    # Make sure that the script will "exit 0" on success or any other
    # value on error.
    #
    # In order to enable or disable this script just change the execution
    # bits.
    #
    # By default this script does nothing.
   
    # add this line:
    /bin/bash /home/chip/chip/chip-off.sh
   
    exit 0
   

Adjustment

The battery low voltage and current levels are adjustable using:

    # SHUTDOWN_MIN_BATTERY_VOLTAGE ... [mV]
    SHUTDOWN_MIN_BATTERY_VOLTAGE=2100.0
    # SHUTDOWN_MIN_BATTERY_VOLTAGE ... [mA]
    SHUTDOWN_MIN_BATTERY_CURRENT=20.0

The shutdown GPIO pin is adjustable using:

    # see http://docs.getchip.com/#how-you-see-gpio
    POWER_BUTTON_GPIO_NUMBER="414"
    POWER_BUTTON_GPIO="/sys/class/gpio/gpio$POWER_BUTTON_GPIO_NUMBER"

Screenshots