diff --git a/hardware/.gitignore b/hardware/.gitignore
new file mode 100644
index 0000000..fe3af74
--- /dev/null
+++ b/hardware/.gitignore
@@ -0,0 +1,5 @@
+# LTSpice temp files
+*.log
+*.raw
+*.fft
+*.net
diff --git a/hardware/Draft1.asc b/hardware/Draft1.asc
new file mode 100755
index 0000000..74c7c69
--- /dev/null
+++ b/hardware/Draft1.asc
@@ -0,0 +1,93 @@
+Version 4
+SHEET 1 880 680
+WIRE 320 -144 256 -144
+WIRE 432 -144 320 -144
+WIRE 320 -64 320 -80
+WIRE 432 -64 320 -64
+WIRE 320 -48 320 -64
+WIRE 352 16 112 16
+WIRE 432 16 352 16
+WIRE 352 32 352 16
+WIRE 256 112 256 -144
+WIRE 112 128 112 16
+WIRE 224 128 112 128
+WIRE 352 144 352 96
+WIRE 352 144 288 144
+WIRE 432 144 432 96
+WIRE 432 144 352 144
+WIRE 496 144 432 144
+WIRE 640 144 576 144
+WIRE 736 144 640 144
+WIRE -96 160 -176 160
+WIRE 0 160 -96 160
+WIRE 224 160 0 160
+WIRE 640 160 640 144
+WIRE 0 176 0 160
+WIRE 112 176 112 128
+WIRE -880 192 -944 192
+WIRE -96 192 -96 160
+WIRE -944 256 -944 192
+WIRE -96 288 -96 256
+WIRE 0 288 0 256
+WIRE 0 288 -96 288
+WIRE 112 288 112 256
+WIRE 112 288 0 288
+WIRE 256 288 256 176
+WIRE 256 288 112 288
+WIRE 640 288 640 224
+WIRE 640 288 256 288
+WIRE 640 304 640 288
+WIRE -96 320 -96 288
+WIRE -944 352 -944 336
+FLAG -96 320 0
+FLAG 640 304 0
+FLAG 320 -48 0
+FLAG 736 144 out
+FLAG -944 352 0
+SYMBOL res -784 176 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R1
+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
+SYMBOL res 96 160 R0
+SYMATTR InstName R3
+SYMATTR Value 1k
+SYMBOL cap 336 32 R0
+SYMATTR InstName C2
+SYMATTR Value 1µ
+SYMBOL res 416 0 R0
+SYMATTR InstName R4
+SYMATTR Value 100k
+SYMBOL cap 304 -144 R0
+SYMATTR InstName C3
+SYMATTR Value 100n
+SYMBOL res 592 128 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R5
+SYMATTR Value 1k
+SYMBOL cap 624 160 R0
+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
diff --git a/hardware/Draft2.asc b/hardware/Draft2.asc
new file mode 100755
index 0000000..dd62dd2
--- /dev/null
+++ b/hardware/Draft2.asc
@@ -0,0 +1,114 @@
+Version 4
+SHEET 1 880 680
+WIRE 256 -144 -544 -144
+WIRE 432 -144 256 -144
+WIRE 432 -64 320 -64
+WIRE 320 -48 320 -64
+WIRE 352 16 112 16
+WIRE 432 16 352 16
+WIRE 352 32 352 16
+WIRE -768 64 -1056 64
+WIRE -544 64 -544 -144
+WIRE -544 64 -592 64
+WIRE -256 80 -464 80
+WIRE 256 112 256 -144
+WIRE 112 128 112 16
+WIRE 224 128 112 128
+WIRE 352 144 352 96
+WIRE 352 144 288 144
+WIRE 432 144 432 96
+WIRE 432 144 352 144
+WIRE 496 144 432 144
+WIRE 640 144 576 144
+WIRE 736 144 640 144
+WIRE -336 160 -416 160
+WIRE -256 160 -256 80
+WIRE -256 160 -272 160
+WIRE -224 160 -256 160
+WIRE -96 160 -144 160
+WIRE 0 160 -96 160
+WIRE 224 160 0 160
+WIRE 640 160 640 144
+WIRE -1056 176 -1056 144
+WIRE -768 176 -1056 176
+WIRE -464 176 -464 80
+WIRE -464 176 -592 176
+WIRE 0 176 0 160
+WIRE 112 176 112 128
+WIRE -416 192 -416 160
+WIRE -96 192 -96 160
+WIRE -416 288 -416 272
+WIRE -96 288 -96 256
+WIRE -96 288 -416 288
+WIRE 0 288 0 256
+WIRE 0 288 -96 288
+WIRE 112 288 112 256
+WIRE 112 288 0 288
+WIRE 256 288 256 176
+WIRE 256 288 112 288
+WIRE 640 288 640 224
+WIRE 640 288 256 288
+WIRE 640 304 640 288
+WIRE -96 320 -96 288
+FLAG -96 320 0
+FLAG 640 304 0
+FLAG 320 -48 0
+FLAG 736 144 out
+SYMBOL res -128 144 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R1
+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
+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 1µ
+SYMBOL res 416 0 R0
+SYMATTR InstName R5
+SYMATTR Value 100k
+SYMBOL res 592 128 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R6
+SYMATTR Value 1k
+SYMBOL cap 624 160 R0
+SYMATTR InstName C3
+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 OpAmps\\LTC1050 256 80 R0
+SYMATTR InstName U1
+SYMBOL voltage -416 176 R0
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName V2
+SYMATTR Value SINE(0 325 50)
+SYMBOL cap -272 144 R90
+WINDOW 0 0 32 VBottom 2
+WINDOW 3 32 32 VTop 2
+SYMATTR InstName C5
+SYMATTR Value 1p
+SYMBOL voltage -1056 48 R0
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName V3
+SYMATTR Value PULSE(0 1 0.2 0.1 0.1 20)
+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
diff --git a/hardware/README.md b/hardware/README.md
index e69de29..50725ca 100644
--- a/hardware/README.md
+++ b/hardware/README.md
@@ -0,0 +1,20 @@
+# 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
\ No newline at end of file
diff --git a/hardware/gazgazgaz.asc b/hardware/gazgazgaz.asc
new file mode 100755
index 0000000..75e902c
--- /dev/null
+++ b/hardware/gazgazgaz.asc
@@ -0,0 +1,29 @@
+Version 4
+SHEET 1 880 680
+WIRE 352 48 240 48
+WIRE -48 64 -48 32
+WIRE 240 112 240 48
+WIRE -48 176 -48 144
+WIRE 64 176 -48 176
+WIRE -48 224 -48 176
+WIRE 240 288 240 192
+WIRE 352 288 240 288
+FLAG 352 48 cp
+IOPIN 352 48 BiDir
+FLAG 352 288 cn
+IOPIN 352 288 BiDir
+FLAG -48 32 gp
+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
diff --git a/hardware/gazgazgaz.asy b/hardware/gazgazgaz.asy
new file mode 100755
index 0000000..9918815
--- /dev/null
+++ b/hardware/gazgazgaz.asy
@@ -0,0 +1,49 @@
+Version 4
+SymbolType BLOCK
+LINE Normal -79 -20 -79 41
+LINE Normal -67 -20 -79 -20
+LINE Normal -66 41 -67 -20
+LINE Normal -50 40 -66 41
+LINE Normal -51 -19 -50 40
+LINE Normal -35 -19 -51 -19
+LINE Normal -34 41 -35 -19
+LINE Normal -13 40 -34 41
+LINE Normal -15 -18 -13 40
+LINE Normal 0 -18 -15 -18
+LINE Normal 2 39 0 -18
+LINE Normal 15 41 2 39
+LINE Normal 15 -15 15 41
+LINE Normal 32 -17 15 -15
+LINE Normal 33 43 32 -17
+LINE Normal 47 43 33 43
+LINE Normal 47 -19 47 43
+LINE Normal 58 -20 47 -19
+LINE Normal 58 44 58 -20
+LINE Normal 73 43 58 44
+LINE Normal 72 -19 73 43
+LINE Normal -86 50 -87 -19
+LINE Normal -41 52 -86 50
+LINE Normal -41 -11 -41 52
+LINE Normal -41 51 -41 -11
+LINE Normal -5 53 -41 51
+LINE Normal -8 -12 -5 53
+LINE Normal -5 53 -8 -12
+LINE Normal 26 52 -5 53
+LINE Normal 25 -8 26 52
+LINE Normal 26 53 25 -8
+LINE Normal 53 53 26 53
+LINE Normal 52 -8 53 53
+RECTANGLE Normal 95 79 -112 -64
+TEXT -77 -82 Left 2 gaz gaz gaz
+PIN 80 -48 RIGHT 8
+PINATTR PinName cp
+PINATTR SpiceOrder 1
+PIN 80 64 RIGHT 8
+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
diff --git a/hardware/img/rcal.png b/hardware/img/rcal.png
new file mode 100644
index 0000000..a83b966
Binary files /dev/null and b/hardware/img/rcal.png differ