spiff72
commented
5 years ago SOrry for the mess of formatting above - not sure why that happened.
Just to clarify the error logging question above. I would like to know how I can see what (if any errors) are generated and see the stdout of the automatic.py file when it runs as part of the systemd service. I can't figure this part out.
I have attempted to modify the ExecStart= line of the service file to read as follows: ExecStart=/usr/bin/sudo -E /home/pi/fanshim-python/examples/automatic.py --on-threshold 65 --off-threshold 55 --delay 2 --brightness 255
The above works if I use the "original" automatic.py script, but it doesn't start when I use it with my modified automatic.py script.
I also tried the following to get some logging to a file, but this fails to start correctly, even when the unmodifed automatic.py file is used. ExecStart=/usr/bin/sudo -E python3 /home/pi/fanshim-python/examples/automatic.py --on-threshold 65 --off-threshold 55 --delay 2 --brightness 255 >> /home/pi/logfile.txt 2>&1
If I could see the errors I would have an easier time understanding what is wrong (ie is the import board and import neopixel command failing to find them because the sudo python3 path isn't correct??
Thanks!
I am working on a simple neopixel strip (8 pixels) that acts as a temperature gauge for the CPU, lighting up more of the pixels as the temp increases. I got a python script working, but one requirement of the circuitpython-neopixel library i am using requires that the script is run as root.
So I have 2 questions:
Or is there something different that I could do to make this work? Here is my modified code : `
!/usr/bin/env python3
from fanshim import FanShim from threading import Lock import colorsys import psutil import argparse import time import signal import sys import board import neopixel min_val = 55 max_val = 65
parser = argparse.ArgumentParser() parser.add_argument('--threshold', type=float, default=-1, help='Temperature threshold in degrees C to enable fan') parser.add_argument('--hysteresis', type=float, default=-1, help='Distance from threshold before fan is disabled')
parser.add_argument('--off-threshold', type=float, default=55.0, help='Temperature threshold in degrees C to enable fan') parser.add_argument('--on-threshold', type=float, default=65.0, help='Temperature threshold in degrees C to disable fan') parser.add_argument('--delay', type=float, default=2.0, help='Delay, in seconds, between temperature readings') parser.add_argument('--preempt', action='store_true', default=False, help='Monitor CPU frequency and activate cooling premptively') parser.add_argument('--verbose', action='store_true', default=False, help='Output temp and fan status messages') parser.add_argument('--nobutton', action='store_true', default=False, help='Disable button input') parser.add_argument('--noled', action='store_true', default=False, help='Disable LED control') parser.add_argument('--brightness', type=float, default=255.0, help='LED brightness, from 0 to 255')
args = parser.parse_args()
Choose an open pin connected to the Data In of the NeoPixel strip, i.e. board.D18
NeoPixels must be connected to D10, D12, D18 or D21 to work.
pixel_pin = board.D21
The number of NeoPixels
num_pixels = 8
The order of the pixel colors - RGB or GRB. Some NeoPixels have red and green reversed!
For RGBW NeoPixels, simply change the ORDER to RGBW or GRBW.
ORDER = neopixel.GRBW
pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.25, auto_write=False, pixel_order=ORDER)
def clean_exit(signum, frame): set_fan(False) if not args.noled: fanshim.set_light(0, 0, 0) sys.exit(0)
def update_led_temperature(temp): led_busy.acquire() temp = float(temp) temp -= args.off_threshold temp /= float(args.on_threshold - args.off_threshold) temp = max(0, min(1, temp)) temp = 1.0 - temp temp = 120.0 temp /= 360.0 r, g, b = [int(c 255.0) for c in colorsys.hsv_to_rgb(temp, 1.0, args.brightness / 255.0)] fanshim.set_light(r, g, b) led_busy.release()
def update_neo_temp(temp2): pixels.fill((0,0,0,0)) pixels.show temp2 = float(temp2) print(temp2) temp2 -= min_val print(temp2) temp2 /= float(max_val-min_val) print(temp2) temp2 = max(0, min(1,temp2)) print(temp2)
temp2 = 1.0 - temp2
def get_cpu_temp(): t = psutil.sensors_temperatures() for x in ['cpu-thermal', 'cpu_thermal']: if x in t: return t[x][0].current print("Warning: Unable to get CPU temperature!") return 0
def get_cpu_freq(): freq = psutil.cpu_freq() return freq
def set_fan(status): global enabled changed = False if status != enabled: changed = True fanshim.set_fan(status) enabled = status return changed
def set_automatic(status): global armed, last_change armed = status last_change = 0
if args.threshold > -1 or args.hysteresis > -1: print(""" The --threshold and --hysteresis parameters have been deprecated. Use --on-threshold and --off-threshold instead! """) sys.exit(1)
fanshim = FanShim() fanshim.set_hold_time(1.0) fanshim.set_fan(False) armed = True enabled = False led_busy = Lock() enable = False is_fast = False last_change = 0 signal.signal(signal.SIGTERM, clean_exit)
if args.noled: led_busy.acquire() fanshim.set_light(0, 0, 0) led_busy.release()
t = get_cpu_temp() if t >= args.threshold: last_change = get_cpu_temp() set_fan(True)
if not args.nobutton: @fanshim.on_release() def release_handler(was_held): global armed if was_held: set_automatic(not armed) elif not armed: set_fan(not enabled)
try: while True: t = get_cpu_temp() f = get_cpu_freq() was_fast = is_fast is_fast = (int(f.current) == int(f.max)) if args.verbose: print("Current: {:05.02f} Target: {:05.02f} Freq {: 5.02f} Automatic: {} On: {}".format(t, args.off_threshold, f.current / 1000.0, armed, enabled))
except KeyboardInterrupt: pass
`