Raspberry Pi 4 Hardware Overview: RAM Variants, Ports and Power Needs

#!/usr/bin/env python3
# pi4_health.py - quick health report for a Raspberry Pi 4
# Run with: python3 pi4_health.py
import subprocess

# Meaning of each bit returned by 'vcgencmd get_throttled'
FLAGS = {
    0: 'Under-voltage detected now',
    1: 'ARM frequency capped now',
    2: 'Currently throttled',
    3: 'Soft temperature limit active now',
    16: 'Under-voltage has occurred since boot',
    17: 'ARM frequency capping has occurred',
    18: 'Throttling has occurred',
    19: 'Soft temperature limit has occurred',
}

def vcgencmd(*args):
    """Run vcgencmd and return its output as a string."""
    return subprocess.check_output(['vcgencmd', *args], text=True).strip()

def main():
    # Example output: throttled=0x50005
    raw = vcgencmd('get_throttled').split('=')[1]
    value = int(raw, 16)

    # Example output: temp=48.2'C
    temp = vcgencmd('measure_temp').split('=')[1]

    # Example output: frequency(48)=1800404352  (value in Hz)
    clock_hz = int(vcgencmd('measure_clock', 'arm').split('=')[1])

    print(f'Temperature : {temp}')
    print(f'ARM clock   : {clock_hz / 1_000_000:.0f} MHz')
    print(f'Flags       : {raw}')

    if value == 0:
        print('Status      : OK - no power or thermal problems since boot')
        return

    # Print the meaning of every bit that is set
    for bit, meaning in FLAGS.items():
        if value & (1 << bit):
            print(f'  bit {bit:2d}: {meaning}')

if __name__ == '__main__':
    main()