diff --git a/_data/ntnu-courses.yml b/_data/ntnu-courses.yml
index 8fce2d0..d3c1959 100644
--- a/_data/ntnu-courses.yml
+++ b/_data/ntnu-courses.yml
@@ -1,51 +1,81 @@
+# Våren 2021
+-
+ name: Våren 2021
+ href: 21v
+ courses:
+ -
+ course: ttt4280
+ desc: Sensorer og instrumentering, våren 2021.
+ updated: 2021-01-11
+ -
+ course: tfe4130
+ desc: Bølgeforplantning, våren 2021.
+ updated: 2021-01-12
+
# Høsten 2020
--
- course: tfe4152
- desc: Design av integrerte kretser, høsten 2020.
- updated: 2020-12-16
- href: tfe4152/summary
--
- course: ttt4120
- desc: Digital signalbehandling, høsten 2020.
- updated: 2020-12-06
- href: ttt4120/summary
--
- course: mfel3010
- desc: Medisin for teknologi- og realfagsstudenter, høsten 2020.
- updated: 2020-11-25
- href: mfel3010/summary
--
- course: tfe4146
- desc: Halvlederkomponenter, høsten 2020.
- updated: 2020-11-23
- href: tfe4146/summary
+-
+ name: Høsten 2020
+ href: 20h
+ courses:
+ -
+ course: tfe4152
+ desc: Design av integrerte kretser, høsten 2020.
+ updated: 2020-12-16
+ href: tfe4152/summary
+ -
+ course: ttt4120
+ desc: Digital signalbehandling, høsten 2020.
+ updated: 2020-12-06
+ href: ttt4120/summary
+ -
+ course: mfel3010
+ desc: Medisin for teknologi- og realfagsstudenter, høsten 2020.
+ updated: 2020-11-25
+ href: mfel3010/summary
+ -
+ course: tfe4146
+ desc: Halvlederkomponenter, høsten 2020.
+ updated: 2020-11-23
+ href: tfe4146/summary
# Våren 2020
--
- course: ttt4270
- desc: Elektronisk systemdesign, prosjekt, våren 2020.
- updated: 2020-05-05
+-
+ name: Våren 2020
+ href: 20v
+ courses:
+ -
+ course: ttt4270
+ desc: Elektronisk systemdesign, prosjekt, våren 2020.
+ updated: 2020-05-05
# Høsten 2019
--
- course: ttt4265
- desc: Elektronisk systemdesign og -analyse II, høsten 2019.
- updated: 2019-12-02
--
- course: tdt4160
- desc: Datamaskiner og digitalteknikk, høsten 2019.
- updated: 2019-11-28
+-
+ name: Høsten 2019
+ href: 19h
+ courses:
+ -
+ course: ttt4265
+ desc: Elektronisk systemdesign og -analyse II, høsten 2019.
+ updated: 2019-12-02
+ -
+ course: tdt4160
+ desc: Datamaskiner og digitalteknikk, høsten 2019.
+ updated: 2019-11-28
# Våren 2019
--
- course: ttt4260
- desc: Elektronisk systemdesign og -analyse I, våren 2019.
- updated: 2019-05-05
--
- course: tma4105
- desc: Matematikk 2, våren 2019.
- updated: 2019-05-21
--
- course: tdt4102
- desc: Prosedyre og objektorientert programmering, våren 2019.
- updated: 2019-05-15
\ No newline at end of file
+-
+ name: Våren 2019
+ href: 19v
+ courses:
+ -
+ course: ttt4260
+ desc: Elektronisk systemdesign og -analyse I, våren 2019.
+ updated: 2019-05-05
+ -
+ course: tma4105
+ desc: Matematikk 2, våren 2019.
+ updated: 2019-05-21
+ -
+ course: tdt4102
+ desc: Prosedyre og objektorientert programmering, våren 2019.
+ updated: 2019-05-15
\ No newline at end of file
diff --git a/about.md b/about.md
index af0ac5b..dcc2e1b 100644
--- a/about.md
+++ b/about.md
@@ -1,5 +1,5 @@
---
-layout: layouts/page
+layout: layouts/list
title: Om
permalink: /om/
---
diff --git a/ntnu/ttt4265/ttt4265.md b/ntnu/19h/ttt4265/ttt4265.md
similarity index 100%
rename from ntnu/ttt4265/ttt4265.md
rename to ntnu/19h/ttt4265/ttt4265.md
diff --git a/ntnu/tdt4102/tft4102.md b/ntnu/19v/tdt4102/tft4102.md
similarity index 100%
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diff --git a/ntnu/21v/tfe4130/lectures/2021-01-12/2021-01-12.md b/ntnu/21v/tfe4130/lectures/2021-01-12/2021-01-12.md
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+---
+title: "TFE4130 - 1D Bølger"
+description: "2021-01-12"
+math: true
+---
+
+## Hva er bølger?
+
+Bevegelse av partikler i et medium.
+
+Dispersive gjør at signalet kan endre seg over tid og strekning.
+Bølgehastigheten er avhengig av frekvensen.
+
+Ikke-dispersive betyr at bølgen beveger seg med samme hastighet hele tiden, og vil derfor være lik ved alle distanser.
+
+Bølger kan inteferere.
+
+Kurset handler mest om EM-bølger, men mekaniske bølger er enklere.
+Det er da kun trykk som beskriver en bølge, mot en vektor med flere komponenter i EM-bølger.
+
+Velocity potential:
+
+$$WIP$$
+
+Velocities at depth:
+
+$$WIP$$
+
+Dispersjonsrelasjonen i havbølger
+
+$$ \omega^2 = gk \tanh kd $$
+
+Der $g$ er tyngdeakserelasjonen, $k$ er bølgetallet og $d$ er dybden.
+
+### Forskjellige typer bølger
+
+Longitudinale: Langsgående bølger.
+
+Transversale: Bølger som beveger seg normalt på propageringsretningen.
+
+### Matematisk
+
+Bølgene er løsningen på bølgelikningen i forskjellige dimensjoner.
+
+$$ \ddot{u} = \frac{\partial^2 u}{\partial t^2} = c^2 \nabla^2 u $$
+
+Denne løses som en partiell differensiallikning.
+
+En ikke-dispersiv hamonisk bølge er definert:
+
+$$ p(x, t) = \hat{p} \sin(\omega t - kx) $$
+
+Der $\omega = 2\pi f$ er frekvensen, $k = \tfrac{\omega}{c}$ er bølgekonstanten, $c$ er propageringshastigheten og $\hat{p}$ er bølgeamplituden.
+
+## Lydbølger
+
+Lydbølger er endringer i lydtrykket rundt standardtrykket/det statiske trykket.
+
+$$ \underbrace{P_\text{total}(x,t)}_{\text{Lufttrykk, [Pa]}} = \underbrace{P_\text{atm}}_\text{Statisk trykk} + \underbrace{p(x,t)}_\text{endringer i trykket, lyd} $$
+
+
+Bølgelikningen for lydbølger:
+
+$$ \frac{\partial^2 p}{\partial x^2} - \frac{1}{c^2} \frac{\partial^2 p}{\partial t^2} $$
+
+## Helmholtz' likning
+
+Spesialtilfelle av bølgelikningen når bølgen er en harmonisk svingning.
+
+$$ p(x,t) = p(x) e^{j\omega t} $$
+
+Den tidsavhengige faktoren kan faktoriseres ut av likningen og vi står igjen med en ODE.
+
+$$ \frac{\partial^2 p(x)}{\partial x^2} + k^2 p(x) = 0 $$
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diff --git a/ntnu/21v/tfe4130/tfe4130.md b/ntnu/21v/tfe4130/tfe4130.md
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--- /dev/null
+++ b/ntnu/21v/tfe4130/tfe4130.md
@@ -0,0 +1,9 @@
+---
+layout: layouts/list
+title: "TFE4130"
+description: "Bølgeforplantning"
+---
+
+## Forelesninger
+
+[2021-01-12](./lectures/2021-01-12/) - Intro
\ No newline at end of file
diff --git a/ntnu/21v/ttt4280/lectures/2021-01-11/2021-01-11.md b/ntnu/21v/ttt4280/lectures/2021-01-11/2021-01-11.md
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+---
+title: "TTT4280 - Måleusikkerhet"
+description: "2021-01-11"
+math: true
+---
+
+## Faglig innhold
+
+* Måleusikkerhet
+* Støyanalyse
+* Sensorer og aktuatorer
+* Sensortyper
+
+## Hva er sensorer
+
+Noe som kan lese den fysiske verdenen til noe vi kan prosessere.
+
+Finnes mange forskjellige sensorer. Flere i biler, telefoner, klokker osv.
+
+Tidligere ble det estimert at vi skulle ha ca 50 milliarder sensorer i 2020.
+
+## Måleusikkerhet
+
+Bruk av sensor = Utføre en måling.
+
+...og måleverdier har en usikkerhet.
+
+I visse situasjoner har måleusikkerheten masse å si, i andre har det ikke så mye å si.
+
+Sensitivitet er en måling for å ikke gjøre en Type II feil (alarmen løser **ikke** ut).
+
+Spesifisitet er en måling for å ikke gjøre en Type I feil (**falsk** alarm).
+
+
+
+### Grunnmodell for måleprosess
+
+
+
+I realiteten er det støy i alle ledd.
+
+Sannsynligheten for at et sensorsystem gir riktig svar påvirkes av (minst) to faktorer:
+
+* Hvor entydig er underliggende sammenhenger?
+* Hvor nøyaktig kan vi måle de fysiske størrelsene?
+
+$$ \text{SNR} = \frac{\text{(Effekten for) sann verdi}}{\text{(Effekten for) støy}} $$
+
+### Målefeil
+
+Stokastiske feil (Type A feil) påvirker målingens *presisjon*.
+Presisjonen beskriver hvor reproduserbar en måling er.
+
+Systematiske feil (Type B feil) påvirker målingens *sannhet*.
+Sannheten er en måling på hvor langt unna den sanne verdien en måling er.
+
+
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diff --git a/ntnu/21v/ttt4280/ttt4280.md b/ntnu/21v/ttt4280/ttt4280.md
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index 0000000..dc2877e
--- /dev/null
+++ b/ntnu/21v/ttt4280/ttt4280.md
@@ -0,0 +1,10 @@
+---
+layout: layouts/list
+title: "TTT4280"
+description: "Sensorer og instrumentering"
+---
+
+## Forelesninger
+
+[2021-01-11](./lectures/2021-01-11/) - Intro og målesikkerhet
+
diff --git a/ntnu/ntnu.html b/ntnu/ntnu.html
index 73129ab..e049766 100644
--- a/ntnu/ntnu.html
+++ b/ntnu/ntnu.html
@@ -4,13 +4,15 @@ title: "NTNU"
description: "Alt som har med studier på NTNU å gjøre."
---
-{% assign courses = site.data.ntnu-courses | sort: 'update' %}
+{% for semester in site.data.ntnu-courses %}
+{{ semester.name }}
+{% assign courses = semester.courses | sort: 'updated' | reverse %}
{% for course in courses %}
\ No newline at end of file
+