Mark Dixon
Published

Rpi Sense Hat Clock and Weather Data

It displays time/date, temp in C & F, heat index, dew point, dew/fog, frost warning, humidity, air pressure, delta-t, analog clock and more.

BeginnerShowcase (no instructions)1 hour1,821
Rpi Sense Hat Clock and Weather Data

Things used in this project

Story

Read more

Code

rpi Sense Hat Weather and clock

Python
#
# Temperature will take about 5 minutes to settle down as it adjusts for the Pi CPU temp.
# Clock will need an internet connection to sync time
# Joystick change will happen after the current code cycle finishes
# Joystick button = shutdown the Pi
# Joystick up/down = LED brightness
# Joystick Left = scrolling weather
# Joystick Right = clock display
# Create Cron job to start script on Pi boot = @reboot python /home/pi/sensehat.py &
#

import os
import time, datetime
from sense_hat import SenseHat, ACTION_PRESSED, ACTION_HELD, ACTION_RELEASED

sense = SenseHat()
sense.set_rotation(180)
sense.set_imu_config(False, False, False)
sense.low_light = True

s=(0.070) 	# text scroll speed
code=(0)	# which section of code to run

# Dim LED's if joystick Down pressed (Default run state)
def pushed_up(event):
	if event.action == ACTION_PRESSED:
		sense.low_light = True

# Brighten LED's if joystick Up pressed
def pushed_down(event):
	if event.action == ACTION_PRESSED:
		sense.low_light = False

# scrolling weather
def pushed_left(event):
	if event.action == ACTION_PRESSED:
		global code
		code = 0

# clock display
def pushed_right(event):
	if event.action == ACTION_PRESSED:
		global code
		code = 1

# shutdown the Pi
def pushed_middle(event):
	if event.action == ACTION_PRESSED:
		global code
		code = 5

sense.stick.direction_up = pushed_up
sense.stick.direction_down = pushed_down
sense.stick.direction_left = pushed_left
sense.stick.direction_right = pushed_right
sense.stick.direction_middle = pushed_middle

# get CPU temperature
def get_cpu_temp():
	res = os.popen("vcgencmd measure_temp").readline()
	t = float(res.replace("temp=","").replace("'C\n",""))
	return(t)

# use moving average to smooth readings
def get_smooth(x):
	if not hasattr(get_smooth, "t"):
		get_smooth.t = [x,x,x]
	get_smooth.t[2] = get_smooth.t[1]
	get_smooth.t[1] = get_smooth.t[0]
	get_smooth.t[0] = x
	xs = (get_smooth.t[0]+get_smooth.t[1]+get_smooth.t[2])/3
	return(xs)


while True:

# Run code if joystick Right pressed (default code that runs)
	if code == 0:

#	# Display the date and time
		dateString = "%a %-d%b %-I:%M"
		msg = "%s" % (datetime.datetime.now().strftime(dateString))
		sense.show_message(msg, scroll_speed=s, text_colour=(0, 255, 255))

	# Get senser data
		t1 = sense.get_temperature_from_humidity()
		t2 = sense.get_temperature_from_pressure()
		t_cpu = get_cpu_temp()
		h = sense.get_humidity()
		p = sense.get_pressure()

	# calculates the real temperature compensating for CPU heating
		t = (t1+t2)/2
		t_corr = t - ((t_cpu-t)/1.5)
		t_corr = get_smooth(t_corr)
		t_corr = round(t_corr)
		t_corr = int(t_corr)		#Celsius
		tf = ((t_corr * 9/5) + 32)
		tf = round(tf)
		tf = int(tf)				#Fahrenheight

	# Temperature display
		if t_corr <= 5:
			tc = [0, 0, 0] # white
		elif t_corr > 5 and t_corr < 13: 
			tc = [0, 0, 255]  # blue
		elif t_corr >= 13 and t_corr < 18:
			tc = [255, 255, 0]  # yellow
		elif t_corr >= 18 and t_corr <= 26:
			tc = [0, 255, 0]  # green
		elif t_corr > 26:
			tc = [255, 0, 0]  # red
		msg = "temp %sc (%sf) -" % (t_corr, tf)
		sense.show_message(msg, scroll_speed=s, text_colour=tc)

	# Calculate the Heat Index
		T2 = pow(tf, 2)
		H2 = pow(h, 2)
		C1 = [ -42.379, 2.04901523, 10.14333127, -0.22475541, -6.83783e-03, -5.481717e-02, 1.22874e-03, 8.5282e-04, -1.99e-06]
		heatindex1 = C1[0] + (C1[1] * tf) + (C1[2] * h) + (C1[3] * tf * h) + (C1[4] * T2) + (C1[5] * H2) + (C1[6] * T2 * h) + (C1[7] * tf * H2) + (C1[8] * T2 * H2)
		hic1 =  ((heatindex1 - 32) * 5/9)
		hic1 = round(hic1)
		hic1 = int(hic1)
		msg = "feels like %sc -" % (hic1)
		sense.show_message(msg, scroll_speed=s, text_colour=tc)
		
	# Calculate the dew point
		d = t_corr-(14.55+0.114*t_corr)*(1-(0.01*h))-((2.5+0.007*t_corr)*(1-(0.01*h)))**3-(15.9+0.117*t_corr)*(1-(0.01*h))**14
		d = round(d)
		d = int(d)

	# Calculate the difference between dew point & current temp
		e = t_corr - d
		e = round(e)
		e = int(e)
		
	# Dew point display
		if d >= 24:
			dp = [255, 0, 0] #red
			msg = "dew pt %sc (very humid) -" % (d)
		elif d >= 16 and d < 24:
			dp = [0, 255, 0] #green
			msg = "dew pt %sc (humid) -" % (d)
		elif d >= 10 and d < 16:
			dp = [0, 255, 0] #Green
			msg = "dew pt %sc -" % (d)
		elif d < 10:
			dp = [255, 255, 0] #yellow
			msg = "dew pt %sc (dry) -" % (d)
		sense.show_message(msg, scroll_speed=s, text_colour=dp)

	# Water Vapour 
		if e <= 2:
			msg = "dew/fog -"
			hb = [255, 0, 0]  # red
			sense.show_message(msg, scroll_speed=s, text_colour=hb)
		elif e > 3 and e <= 6:
			msg = "dew/fog possible -" 
			hb = [255, 255, 0]  # yellow
			sense.show_message(msg, scroll_speed=s, text_colour=hb)
		else:
			msg = "no fog -" 
		hb = [0, 255, 0]  # green
#		sense.show_message(msg, scroll_speed=s, text_colour=hb)

	# Frost point warning
		if e <= 2 and t_corr <= 1:
			msg = "FROST WARNING -"
			fw = [255, 0, 0]  # red
			sense.show_message(msg, scroll_speed=s, text_colour=fw)

	# Humidity display
		h = sense.get_humidity()
		h = round(h)
		h = int(h)
		if h > 100:
			h = 100
		if h >= 30 and h <= 60:
			hc = [0, 255, 0]  # green
			msg = "humidty %s%% -" % (h)
			sense.show_message(msg, scroll_speed=s, text_colour=hc)
		elif h > 60 and h < 80:
			hc = [255, 255, 0]  # yellow
			msg = "humidty %s%% -" % (h)
			sense.show_message(msg, scroll_speed=s, text_colour=hc)
		else:
			hc = [255, 0, 0]  # red
			msg = "humidty %s%% -" % (h)
			sense.show_message(msg, scroll_speed=s, text_colour=hc)

	# Air pressure display
		p = sense.get_pressure()
		p = round(p)
		p = int(p)
		if p >= 960 and p < 990:
			pc = [255, 0, 0]  # red
			msg = "baro very low %smb (storm) -" % (p)
			sense.show_message(msg, scroll_speed=s, text_colour=pc)
		elif p >= 990 and p < 1000:
			pc = [255, 255, 0]  # yellow
			msg = "baro low %smb (rain) -" % (p)
			sense.show_message(msg, scroll_speed=s, text_colour=pc)
		elif p >= 1000 and p < 1015:
			pc = [0, 255, 0]  # green
			msg = "baro mid %smb (mainly fine) -" % (p)
			sense.show_message(msg, scroll_speed=s, text_colour=pc)
		elif p >= 1015 and p < 1030:
			pc = [0, 0, 255]  # blue
			msg = "baro high %smb (fine) -" % (p)
			sense.show_message(msg, scroll_speed=s, text_colour=pc)
		elif p >= 1030:
			pc = [255, 0, 0]  # red
			msg = "baro very high %smb (dry) -" % (p) 
			sense.show_message(msg, scroll_speed=s, text_colour=pc)

	# Wet Bulb Temperature
		Tdc = ((t_corr-(14.55+0.114*t_corr)*(1-(0.01*h))-((2.5+0.007*t_corr)*(1-(0.01*h)))**3-(15.9+0.117*t_corr)*(1-(0.01*h))**14))

		E = (6.11*10**(7.5*Tdc/(237.7+Tdc)))

		WBc = (((0.00066*p)*t_corr)+((4098*E)/((Tdc+237.7)**2)*Tdc))/((0.00066*p)+(4098*E)/((Tdc+237.7)**2))

	# Delta-T - If the Delta T is between 2C and 8C, pesticides are more effective
		Dt = t_corr - WBc
		Dt = round(Dt)
		Dt = int(Dt)
		msg = "delta-t %sc" % (Dt) 
		sense.show_message(msg, scroll_speed=s, text_colour=[0, 255, 0])

	# Vapor Pressure(Mb)
		Vp = (6.11*10**(7.5*((t_corr-(14.55+0.114*t_corr)*(1-(0.01*h))-((2.5+0.007*t_corr)*(1-(0.01*h)))**3-(15.9+0.117*t_corr)*(1-(0.01*h))**14))/(237.7+((t_corr-(14.55+0.114*t_corr)*(1-(0.01*h))-((2.5+0.007*t_corr)*(1-(0.01*h)))**3-(15.9+0.117*t_corr)*(1-(0.01*h))**14)))))
		Vp = round(Vp)
		Vp = int(Vp)
		msg = "vapor pressure: %sMb -" % (Vp) 
#		sense.show_message(msg, scroll_speed=s, text_colour=[0, 255, 0])

# Run code if joystick Left pressed	
	if code == 1 or code == 0:		# Remove 'or code == 0' if you dont want the clock to display 
		clock = (0)

		u = 60.0/29
		zero = [[0,0,1,1,0,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,0,1,1,0,0]]  
		one=[[0,0,0,1,0,0],[0,0,1,1,0,0],[0,0,0,1,0,0],[0,0,0,1,0,0],[0,0,0,1,0,0],[0,0,1,1,1,0]]  
		two=[[0,0,1,1,0,0],[0,1,0,0,1,0],[0,0,0,0,1,0],[0,0,0,1,0,0],[0,0,1,0,0,0],[0,1,1,1,1,0]]  
		three=[[0,0,1,1,0,0],[0,1,0,0,1,0],[0,0,0,1,0,0],[0,0,0,0,1,0],[0,1,0,0,1,0],[0,0,1,1,0,0]]  
		four=[[0,0,0,0,1,0],[0,0,0,1,1,0],[0,0,1,0,1,0],[0,1,1,1,1,0],[0,0,0,0,1,0],[0,0,0,0,1,0]]  
		five=[[0,1,1,1,1,0],[0,1,0,0,0,0],[0,1,1,1,0,0],[0,0,0,0,1,0],[0,1,0,0,1,0],[0,0,1,1,0,0]]  
		six=[[0,0,1,1,0,0],[0,1,0,0,0,0],[0,1,1,1,0,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,0,1,1,0,0]]  
		seven=[[0,1,1,1,1,0],[0,0,0,0,1,0],[0,0,0,1,0,0],[0,0,0,1,0,0],[0,0,1,0,0,0],[0,0,1,0,0,0]]  
		eight=[[0,0,1,1,0,0],[0,1,0,0,1,0],[0,0,1,1,0,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,0,1,1,0,0]]  
		nine=[[0,0,1,1,0,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,0,1,1,1,0],[0,0,0,0,1,0],[0,0,1,1,0,0]]  
		ten=[[0,1,0,0,1,0],[1,1,0,1,0,1],[0,1,0,1,0,1],[0,1,0,1,0,1],[0,1,0,1,0,1],[0,1,0,0,1,0]]  
		eleven=[[0,1,0,0,1,0],[1,1,0,1,1,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,1,0,0,1,0],[0,1,0,0,1,0]]  
		twelve=[[0,1,0,0,1,0],[1,1,0,1,0,1],[0,1,0,0,0,1],[0,1,0,0,1,0],[0,1,0,1,0,0],[0,1,0,1,1,1]]

		nums = [zero, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve]

		# hour background color
		z = [0,0,0]

		# hour number color
		w = [0,0,255]

		# minute background color
		e = [0,0,0]

		# minute dot color
		x = [0,150,0]

		def row_one(m):  
		    result = [0,0,0,0,0,0,0,0]
		    if m > u*4 and m < u*25:
			result = [0,0,0,0,1,1,1,1]
		    else:
			if m < u:
			    result = [0,0,0,0,0,0,0,0]
			elif m < u*2:
			    result = [0,0,0,0,1,0,0,0]
			elif m < u*3:
			    result = [0,0,0,0,1,1,0,0]
			elif m < u*4:
			    result = [0,0,0,0,1,1,1,0]
			elif m < u*25:
			    result = [0,0,0,0,1,1,1,1]
			elif m < u*26:
			    result = [1,0,0,0,1,1,1,1]
			elif m < u*27:
			    result = [1,1,0,0,1,1,1,1]
			elif m < u*28:
			    result = [1,1,1,0,1,1,1,1]
			else:
			    result = [1,1,1,1,1,1,1,1]
		    return result

		def row_eight(m):  
		    result = [1,1,1,1,1,1,1,1]
		    if m < u*18:
			if m < u*11:
			    result = [0,0,0,0,0,0,0,0]
			elif m < u*12:
			    result = [0,0,0,0,0,0,0,1]
			elif m < u*13:
			    result = [0,0,0,0,0,0,1,1]
			elif m < u*14:
			    result = [0,0,0,0,0,1,1,1]
			elif m < u*15:
			    result = [0,0,0,0,1,1,1,1]
			elif m < u*16:
			    result = [0,0,0,1,1,1,1,1]
			elif m < u*17:
			    result = [0,0,1,1,1,1,1,1]
			else:
			    result = [0,1,1,1,1,1,1,1]
		    return result

		def convert_to_color(arr, background, color):  
		    return [background if j == 0 else color for j in arr]

		def update_clock(hh, mm):  
		    if hh > 12:
			hh = hh - 12

		    img = []

		    # row 1
		    row1 = row_one(mm)
		    img.extend(convert_to_color(row1, e, x))

		    # row 2-7
		    for i in range(6):
			if mm > (u*(24-i)):
			    img.append(x)
			else:
			    img.append(e)

			# hour number
			img.extend(convert_to_color(nums[hh][i], z, w))

			if mm > (u*(5+i)):
			    img.append(x)
			else:
			    img.append(e)

		    #row 8
		    row8 = row_eight(mm)
		    img.extend(convert_to_color(row8, e, x))
		    sense.set_pixels(img)

		if code == 1:
			now = datetime.datetime.now()
			update_clock(now.hour, now.minute*1.0)
			time.sleep(10)
		if code == 0:
			while clock < 30:		# will display sesnor data every 5 min if set to 30
				now = datetime.datetime.now()
				update_clock(now.hour, now.minute*1.0)
				time.sleep(10)
				clock = clock + 1

			


# Shutdown the Pi if joystick center button pressed
	if code == 5:
		sense.show_message("Shutdown", scroll_speed=s, text_colour=[255, 0, 0])
		os.system("sudo shutdown now -P")

# Code mangled together by MarkD - Version 1.0 - Dec17
#
# Code Sources:
# Kerry Waterfield - https://forums.pimoroni.com/t/my-portable-weather-clock-astro-pi/5132
# Michael Bell - https://iridl.ldeo.columbia.edu/dochelp/QA/Basic/dewpoint.html
# http://yaab-arduino.blogspot.com.au/2016/08/accurate-temperature-reading-sensehat.html
# Liu Siwei - https://yjlo.xyz/blog/design-a-digital-clock-on-raspberry-pi-sense-hat/
# https://github.com/gregnau/heat-index-calc/blob/master/heat-index-calc.py
# https://www.aprweather.com/pages/calc.htm

Credits

Mark Dixon

Mark Dixon

1 project • 0 followers

Comments