works: setup generator_PCB, set params (temps, currents, PI coeffs) (switches PCB to constant current on lasers), set current sweep params (switches PCB to varying laser currents).

device_conversion.py

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+
+
+import math
+
+# ---- Conversion functions
+
+VREF = 2.5 # Volts
+
+R1 = 10000 # Ohm
+R2 = 2200 # Ohm
+R3 = 27000 # Ohm
+R4 = 30000 # Ohm
+R5 = 27000 # Ohm
+R6 = 56000 # Ohm
+
+RREF = 10 # Ohm (current-setting resistor) @1550 nm - 28.7 Ohm; @840 nm - 10 Ohm
+
+R7 = 22000 # Ohm
+R8 = 22000 # Ohm
+R9 = 5100 # Ohm
+R10 = 180000 # Ohm
+
+class Task:
+    def __init__(self):
+        self.task_type = 0
+        # Here should be fields, contained task parameters
+
+def conv_T_C_to_N(T):
+    Rt = 10000 * math.exp( 3900/(T+273) - 3900/298 )
+    U = VREF/(R5*(R3+R4)) * ( R1*R4*(R5+R6) - Rt*(R3*R6-R4*R5) ) / (Rt+R1)
+    N = int(U * 65535 / VREF)
+    if N<0 or N>65535:
+        print("Error converting T=" + str(T) + " to N=" + str(N) + ". N should be within [0, 65535]. Returning N=0.")
+    return N
+
+def conv_T_N_to_C(N):
+    U = N*VREF/65535 # Volts
+    Rt = R1 * (VREF*R4*(R5+R6) - U*R5*(R3+R4)) / (U*R5*(R3+R4) + VREF*R3*R6 - VREF*R4*R5) # Ohm
+    T = 1 / (1/298 + 1/3900 * math.log(Rt/10000)) - 273 # In Celsius
+    return T
+
+def conv_TExt_N_to_C(N):
+    U = N*VREF/4095*1/(1+100000/R10) + VREF*R9/(R8+R9) # Volts
+    Rt = R7*U/(VREF-U) # Ohm
+    T = 1 / (1/298 + 1/3455 * math.log(Rt/10000)) - 273 # In Celsius
+    return T
+
+def conv_I_mA_to_N(I):
+    N = int(65535/2000 * RREF * I) # I in mA
+    if N<0 or N>65535:
+        print("Error converting I=" + str(I) + " to N=" + str(N) + ". N should be within [0, 65535]. Returning N=0.")
+        N=0
+    return N
+
+def conv_I_N_to_mA(N):
+    return N*2.5/(65535*4.4) - 1/20.4 # I in mA
+
+
+def conv_U3V3_N_to_V(u_int):
+    return u_int * 1.221 * 0.001 # Volts
+
+def conv_U5V_N_to_V(u_int):
+    return u_int * 1.8315 * 0.001 # Volts
+
+def conv_U7V_N_to_V(u_int):
+    return u_int * 6.72 * 0.001 # Volts
+
+