Added measurement script for multiple devices

tests/find_address.py

@@ -6,8 +6,8 @@ import serial
 
 
 print('---- Looking for device ----')
-slave_address_list = range(1,256)
-baud_list = [4800,115200]
+slave_address_list = range(200,256)
+baud_list = [19200,115200]
 CO2_addr = 9
 total_devices = 0
 for slave_address in slave_address_list:

tests/measure_multiple_devices.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+from time import sleep, time
+from sys import exit
+import minimalmodbus
+import serial
+
+slave_address_list = [ 252, 253 ]
+
+# read
+while True:
+    for slave_address in slave_address_list:
+        # initialize modbus
+        instrument = minimalmodbus.Instrument('/dev/rs485', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
+        instrument.serial.baudrate = 115200
+        instrument.serial.bytesize = 8
+        instrument.serial.parity   = serial.PARITY_EVEN
+        instrument.serial.stopbits = 1
+        instrument.serial.timeout  = 0.05          # seconds
+        instrument.mode = minimalmodbus.MODE_RTU   # rtu or ascii mode
+        instrument.clear_buffers_before_each_transaction = True
+
+        try:
+            CO2_addr = 9
+            CO2 = instrument.read_register(CO2_addr, 1, functioncode=4) * 10
+            T_SHT4x_addr = 10
+            T_SHT4x = instrument.read_register(T_SHT4x_addr, 1, functioncode=4)
+            RH_SHT4x_addr = 11
+            RH_SHT4x = instrument.read_register(RH_SHT4x_addr, 1, functioncode=4) * 10
+            T_SCD4x_addr = 12
+            T_SCD4x = instrument.read_register(T_SCD4x_addr, 1, functioncode=4)
+            RH_SCD4x_addr = 13
+            RH_SCD4x = instrument.read_register(RH_SCD4x_addr, 1, functioncode=4) * 10
+            T_SHT4x_signed_addr = 14
+            T_SHT4x_signed = instrument.read_register(T_SHT4x_signed_addr,  1, functioncode=4, signed=True)
+            T_SCD4x_signed_addr = 15
+            T_SCD4x_signed = instrument.read_register(T_SCD4x_signed_addr, 1, functioncode=4, signed=True)
+            with open(f'measurement_device_{slave_address}.csv', 'a+') as f:
+                f.write(f'{time():.1f} {CO2} {T_SHT4x} {RH_SHT4x} {T_SCD4x} {RH_SCD4x} {T_SHT4x_signed} {T_SCD4x_signed}\n')
+        except minimalmodbus.NoResponseError:
+            print(f'Read error for device {slave_address} at {time()}')
+            continue
+    sleep(10)