Added LTSpice simulation. Modifying how Rcal can be interpreted.

hardware/.gitignore

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+# LTSpice temp files
+*.log
+*.raw
+*.fft
+*.net

hardware/Draft1.asc

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+WINDOW 3 32 56 VTop 2
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+SYMATTR Value 10k
+SYMBOL cap -112 192 R0
+SYMATTR InstName C1
+SYMATTR Value 100n
+SYMBOL res -16 160 R0
+SYMATTR InstName R2
+SYMATTR Value 100k
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+SYMATTR Value 1k
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+SYMATTR Value 1k
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+SYMATTR InstName C4
+SYMATTR Value 100n
+SYMBOL voltage 432 -160 R0
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName V1
+SYMATTR Value 5
+SYMBOL current -944 336 R180
+WINDOW 0 24 80 Left 2
+WINDOW 3 -321 -85 Left 2
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName I1
+SYMATTR Value PULSE(50n 100n 1 0.1 0.1 2) AC 1 0
+SYMBOL OpAmps\\LTC1050 256 80 R0
+SYMATTR InstName U1
+TEXT -370 410 Left 2 !;.tran 4
+TEXT -272 -112 Left 2 !.ac oct 200 0.1 0.1G

hardware/Draft2.asc

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+WINDOW 3 32 56 VTop 2
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+SYMBOL cap -112 192 R0
+SYMATTR InstName C1
+SYMATTR Value 100n
+SYMBOL res -16 160 R0
+SYMATTR InstName R2
+SYMATTR Value 100k
+SYMBOL res 96 160 R0
+WINDOW 3 36 68 Left 2
+SYMATTR InstName Rcal1
+SYMATTR Value {RCAL1}
+SYMBOL cap 336 32 R0
+SYMATTR InstName C2
+SYMATTR Value 1ľ
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+SYMATTR InstName R5
+SYMATTR Value 100k
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+WINDOW 3 32 56 VTop 2
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+SYMATTR Value 1k
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+SYMATTR InstName U1
+SYMBOL voltage -416 176 R0
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+WINDOW 39 0 0 Left 0
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+SYMATTR Value SINE(0 325 50)
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+WINDOW 3 32 32 VTop 2
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+SYMATTR Value 1p
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+WINDOW 39 0 0 Left 0
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+SYMBOL gazgazgaz -672 112 R0
+SYMATTR InstName X1
+TEXT -368 408 Left 2 !.tran 2
+TEXT -720 264 Left 2 !.param G0=200n
+TEXT -720 312 Left 2 !.param G1=200n
+TEXT -712 360 Left 2 !.param R0 100k
+TEXT 120 336 Left 2 !.param RCAL1=10k

hardware/README.md

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+# Hardware
+## LTSpice simulation
+
+By modifying the $R_{cal1}$ resistor we can see that the maximum output voltage can go up to $5V$. The goal would be to modify this resistor value to have a maximum output of around $3.3V$:
+$$a=\frac{\Delta{y}}{\Delta{x}}=\frac{y_2-y_1}{x_2-x_1}$$
+$$AN: a=\frac{10k-1k}{2.1-4.94}$$
+$$AN: a=-3170$$
+---
+$$y=-3170x+b$$
+$$1000=-3170(4.94)+b$$
+$$b=3170(4.94)+1000$$
+$$b=16659$$
+---
+$$y=-3170x+16659$$
+We can now calculate the resistor $R_{cal1}$ to have $3.3V$ in maximum output with the previous formula, we find:
+$$-3.17\times{10^3\times{3.3V}}+16.7\times{10^3}=6.2k\Omega$$
+
+![rcal_ok](img/rcal.png)
+> Has we can see with the LTSpice simulation, we have the correct maximum voltage, it does not go further than $3.29V$ which is exactly what we wanted.
+## Electronic CAD

hardware/gazgazgaz.asc

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+WIRE 352 48 240 48
+WIRE -48 64 -48 32
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+WIRE -48 176 -48 144
+WIRE 64 176 -48 176
+WIRE -48 224 -48 176
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+IOPIN 352 48 BiDir
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+IOPIN 352 288 BiDir
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+IOPIN -48 32 BiDir
+FLAG -48 288 gn
+IOPIN -48 288 BiDir
+FLAG 64 176 gc
+IOPIN 64 176 BiDir
+SYMBOL bi 240 112 R0
+SYMATTR InstName B1
+SYMATTR Value I=V(cp,cn)*({G0}+(v(gc,gn)*{G1}))
+SYMBOL res -64 48 R0
+SYMATTR InstName Rzero
+SYMATTR Value {R0}
+SYMBOL cap -64 224 R0
+SYMATTR InstName C0
+SYMATTR Value 200n

hardware/gazgazgaz.asy

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+TEXT -77 -82 Left 2 gaz gaz gaz
+PIN 80 -48 RIGHT 8
+PINATTR PinName cp
+PINATTR SpiceOrder 1
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+PINATTR PinName cn
+PINATTR SpiceOrder 2
+PIN -96 -48 LEFT 8
+PINATTR PinName gp
+PINATTR SpiceOrder 3
+PIN -96 64 LEFT 8
+PINATTR PinName gn
+PINATTR SpiceOrder 4