You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
864 B
36 lines
864 B
7 years ago
|
import time
|
||
|
|
|
||
|
|
import gex
|
||
|
|
|
||
|
|
with gex.Client(gex.TrxRawUSB()) as client:
|
||
|
|
ser = gex.USART(client, 'ser')
|
||
|
|
leds = gex.SIPO(client, 'leds')
|
||
|
|
|
||
|
|
while True:
|
||
|
|
ser.clear_buffer()
|
||
|
|
ser.write([0xFF, 0x01, 0x86, 0, 0, 0, 0, 0, 0x79])
|
||
|
|
data = ser.receive(9, decode=None)
|
||
|
|
|
||
|
|
pp = gex.PayloadParser(data, endian="big").skip(2)
|
||
|
|
ppm = pp.u16()
|
||
|
|
|
||
|
|
# The LEDs are connected to two 595's, interleaved R,G,R,G...
|
||
|
|
nl = (ppm-300)/1700.0
|
||
|
|
print("%d ppm CO₂, numleds %f" % (ppm, nl*8))
|
||
|
|
|
||
|
|
numb = 0
|
||
|
|
for i in range(0,8):
|
||
|
|
if nl >= i*0.125:
|
||
|
|
if i < 3:
|
||
|
|
numb |= 2<<(i*2)
|
||
|
|
elif i < 6:
|
||
|
|
numb |= 3<<(i*2)
|
||
|
|
else:
|
||
|
|
numb |= 1<<(i*2)
|
||
|
|
|
||
|
|
leds.load([(numb&0xFF00)>>8,numb&0xFF])
|
||
|
|
|
||
|
|
|
||
|
|
time.sleep(1)
|
||
|
|
|