@ -24,9 +24,11 @@ interrupt -- or something like Htop... doesn't matter.
import json
import json
import RPi . GPIO as GPIO
import RPi . GPIO as GPIO
import time , math
import time
import math
import requests
import requests
from datetime import datetime
from datetime import datetime
import platform
# import pdb # For testing.
# import pdb # For testing.
# Using BCM (Broadcom) names when referencing the GPIO pins.
# Using BCM (Broadcom) names when referencing the GPIO pins.
@ -36,8 +38,21 @@ GPIO.setwarnings(True)
a_pin = 18 # Charges the capacitor.
a_pin = 18 # Charges the capacitor.
b_pin = 23 # Discharges the capacitor.
b_pin = 23 # Discharges the capacitor.
device_id = platform . node ( ) # For servers logs.
def get_api_url ( ) :
# Yes, I know I could do this better. Stop moaning.
if ( device_id == " factory1 " ) :
return " http://ritherdon.abbether.net/api/readings/add/1 "
elif ( device_id == " factory2 " ) :
return " http://ritherdon.abbether.net/api/readings/add/2 "
# Make sure this is valid.
# Make sure this is valid.
api_url = " http://3.9.19.84/api/readings/add/1 "
# api_url = "http://ritherdon.abbether.net/api/readings/add/1"
api_url = get_api_url ( )
def discharge ( ) :
def discharge ( ) :
GPIO . setup ( a_pin , GPIO . IN )
GPIO . setup ( a_pin , GPIO . IN )
@ -45,6 +60,7 @@ def discharge():
GPIO . output ( b_pin , False )
GPIO . output ( b_pin , False )
time . sleep ( 0.01 ) # 0.01 -- initial/default value.
time . sleep ( 0.01 ) # 0.01 -- initial/default value.
def charge_time ( ) :
def charge_time ( ) :
GPIO . setup ( b_pin , GPIO . IN )
GPIO . setup ( b_pin , GPIO . IN )
GPIO . setup ( a_pin , GPIO . OUT )
GPIO . setup ( a_pin , GPIO . OUT )
@ -55,42 +71,50 @@ def charge_time():
t2 = time . time ( )
t2 = time . time ( )
return ( t2 - t1 ) * 1000000
return ( t2 - t1 ) * 1000000
def analog_read ( ) :
def analog_read ( ) :
discharge ( )
discharge ( )
return charge_time ( )
return charge_time ( )
def read_resistance ( ) :
def read_resistance ( ) :
n = 20
n = 20
total = 0 ;
total = 0
for i in range ( 1 , n ) :
for i in range ( 1 , n ) :
total = total + analog_read ( )
total = total + analog_read ( )
reading = total / float ( n )
reading = total / float ( n )
resistance = reading * 6.05 - 939
resistance = reading * 6.05 - 939
return resistance
return resistance
def light_from_r ( R ) :
def light_from_r ( R ) :
return math . log ( 1000000.0 / R ) * 10.0
return math . log ( 1000000.0 / R ) * 10.0
def get_timestamp ( ) :
def get_timestamp ( ) :
return datetime . now ( ) . strftime ( ( " % Y- % m- %d % H: % M: % S " ) )
return datetime . now ( ) . strftime ( ( " % Y- % m- %d % H: % M: % S " ) )
def push_reading ( lvalue ) :
def push_reading ( lvalue ) :
time = get_timestamp ( )
time = get_timestamp ( )
headers = { " content-type " : " application/json " }
headers = { " content-type " : " application/json " }
payload = { " reading " : int ( lvalue ) , " time " : time , " token " : " QWERTYuiopasdfghjklzxcvbnm_1234567890 " }
payload = { " reading " : int ( lvalue ) , " time " : time ,
" token " : " QWERTYuiopasdfghjklzxcvbnm_1234567890 " }
# print(payload) # For testing.
# print(payload) # For testing.
res = requests . post ( api_url , data = json . dumps ( payload ) , headers = headers )
res = requests . post ( api_url , data = json . dumps ( payload ) , headers = headers )
def update_reading ( ) :
def update_reading ( ) :
light = light_from_r ( read_resistance ( ) )
light = light_from_r ( read_resistance ( ) )
reading_str = " {:.0f} " . format ( light )
reading_str = " {:.0f} " . format ( light )
# print(reading_str) # For testing.
# print(reading_str) # For testing.
push_reading ( light )
push_reading ( light )
def main ( ) :
def main ( ) :
try :
try :
while True :
while True :
#pdb.set_trace() # For testing.
# pdb.set_trace() # For testing.
update_reading ( )
update_reading ( )
except KeyboardInterrupt :
except KeyboardInterrupt :
print ( " Keyboard Interrupt: quitting program. " )
print ( " Keyboard Interrupt: quitting program. " )
@ -100,6 +124,7 @@ def main():
print ( " Cleaning up GPIO before closing... " )
print ( " Cleaning up GPIO before closing... " )
GPIO . cleanup ( )
GPIO . cleanup ( )
if __name__ == " __main__ " :
if __name__ == " __main__ " :
# time.sleep(60) # For testing/debugging.
# time.sleep(60) # For testing/debugging.
main ( )
main ( )