Hello,
I have idea to augment weather station data with level of ionizing
radiation. Simple and inexpensive geiger counter model was chosen. Device
is Radex One.
Primarily unit works with dedicated Windows software via USB port.
After some playing with serial port monitor is possible to send request and
then receive response from device.
Below is sample response from dosimeter.
7AFF208016000A0000004480000800000C0000007103000004020000710300000DEF
Where bytes x000371 = 8,81uSv/h (dose rate), x000204 = 5,16 uSv
(accumulated dose), x000371 = 881 CPS (counts per minute)
Is possible to fix phyton script below to adopt it for my device?
Need to say, program below is written to comunicate with same manufacuter
device, but device purpose differs, it measures radon gas concetration in
air, also it measures temperature and humidity.
According data bytes is represented with IEEE754 format, but for my
dosimeter is just simple conversion from hex to dec and data string length
is smaller (34 bytes vs 70 bytes from radon meter)
import serial
import struct
ser = serial.Serial(
port='/dev/ttyACM0',
baudrate=9600,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS
)
ser.isOpen()
packet =
bytearray(b'x7bxffx20x00x06x00x83x04x00x00xdaxfbx04x08x0cx00xefxf7')
ser.write(packet)
raw_temp = ""
raw_hum = ""
raw_rad2 = ""
raw_rad3 = ""
exp_timer = 0;
for x in range(0, 70):
c = ser.read()
print '{0:x}'.format(ord(c), 10), " ",
if x in range(28, 32):
raw_rad3 = raw_rad3 + c
if x in range(32, 36):
raw_temp = raw_temp + c
if x in range(36, 40):
raw_hum = raw_hum + c
if x in range(56, 60):
raw_rad2 = raw_rad2 + c
if x == 64:
exp_timer = ord(c);
if x == 65:
exp_timer = ord(c) * 256 + exp_timer;
print ""
[temperature] = struct.unpack('f', raw_temp)
print "Temperature: " + str(temperature)
[humidity] = struct.unpack('f', raw_hum)
print "Humidity: " + str(humidity)
[radoncur] = struct.unpack('f', raw_rad3)
print "Radon Cur: " + str(radoncur)
[radonmax] = struct.unpack('f', raw_rad2)
print "Radon Max: " + str(radonmax)
print "Exposure countdown: " + str(exp_timer)
Thanks
Andrej
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