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add power control #3

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1ec8887
add power control
AR1972 Nov 12, 2017
3b98e3e
improve sensor communication
AR1972 Nov 12, 2017
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16 changes: 15 additions & 1 deletion NDIR_RasPi_Python/NDIR.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@ class Sensor():
cmd_measure = [0xFF,0x01,0x9C,0x00,0x00,0x00,0x00,0x00,0x63]
ppm = 0

IODIR = 0X0A << 3
IOSTATE = 0X0B << 3
IOCONTROL = 0X0E << 3
FCR = 0X02 << 3
LCR = 0X03 << 3
Expand Down Expand Up @@ -46,7 +48,7 @@ def measure(self):
try:
self.write_register(self.FCR, 0x07)
self.send(self.cmd_measure)
time.sleep(0.01)
time.sleep(0.02)
self.parse(self.receive())
return True
except IOError:
Expand Down Expand Up @@ -96,3 +98,15 @@ def receive(self):
break

return buf

def power_on(self):
state = self.read_register(self.IOSTATE)
state |= 1
self.write_register(self.IOSTATE, state)

def power_off(self):
self.write_register(self.IODIR, 0x03)
state = self.read_register(self.IOSTATE)
state &= ~1
self.write_register(self.IOSTATE, state)

12 changes: 10 additions & 2 deletions NDIR_RasPi_Python/example.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,11 +6,19 @@
if sensor.begin() == False:
print("Adaptor initialization FAILED!")
exit()

while True:
sensor.power_on()
print("Power On")
i = 0
while i < 50:
if i == 25:
sensor.power_off()
print("Power Off")
sensor.ppm = -1
if sensor.measure():
print("CO2 Concentration: " + str(sensor.ppm) + "ppm")
else:
print("Sensor communication ERROR.")

time.sleep(1)
i += 1