diff --git a/src/includes/posts/inventr-ak1.md b/src/includes/posts/inventr-ak1.md
index 8b85940cc..29eea2a47 100644
--- a/src/includes/posts/inventr-ak1.md
+++ b/src/includes/posts/inventr-ak1.md
@@ -10,4 +10,5 @@
 - [Day 9](inventr-ak1-day9)
 - [Day 10](inventr-ak1-day10)
 - [Day 11](inventr-ak1-day11)
-- [Day 12](inventr-ak1-day12)
\ No newline at end of file
+- [Day 12](inventr-ak1-day12)
+- [Day 13](inventr-ak1-day13)
\ No newline at end of file
diff --git a/src/input/posts/inventr-ak1-day12.md b/src/input/posts/inventr-ak1-day12.md
index 9cea5d3d7..e30e38d39 100644
--- a/src/input/posts/inventr-ak1-day12.md
+++ b/src/input/posts/inventr-ak1-day12.md
@@ -22,7 +22,7 @@ Today was an extension of [Day 11](inventr-ak1-day11), I got to use a new device
 
 !["Day 12"](images/inventr/ak1/Day12.jpg "Day 12")
 
-![Keypad](images/inventr/ak1/passive-buzzer.png "Keypad")
+![Passive Buzzer](images/inventr/ak1/passive-buzzer.png "Passive Buzzer")
 
 We are still using the keypad:
 
diff --git a/src/input/posts/inventr-ak1-day13.md b/src/input/posts/inventr-ak1-day13.md
new file mode 100644
index 000000000..506553f91
--- /dev/null
+++ b/src/input/posts/inventr-ak1-day13.md
@@ -0,0 +1,79 @@
+---
+title: Day 13 - 30 Days Lost in Space
+tags:
+  - inventr
+author: alexhedley
+description: Inventr - Adventure Kit 1
+published: 2024-01-01
+image: /posts/images/inventr/inventr_io_cover.jpg
+imageattribution: https://inventr.io/
+---
+
+<!-- # Day 13 - 30 Days Lost in Space - Inventr -->
+
+## 🏫 Lesson 13
+
+- Day 13: HERO Security 101
+
+  - [Original](https://inventr.io/lessons/day-13/)
+  - [Remake](https://inventr.io/lessons/day-13-2/)
+
+Today was a continuation of [Day 11](inventr-ak1-day11) and [Day 12](inventr-ak1-day12) but more coding and logic, using the same wiring and setup. This time we need to type in a password to get access to the system. We can also change the password.
+
+<!-- !["Day 13"](images/inventr/ak1/Day13.jpg "Day 13") -->
+
+![Keypad](images/inventr/ak1/keypad.png "Keypad")
+
+Trying out the different options.
+
+```bash
+11:33:10.390 -> Press * to set a new password.
+11:33:10.432 -> Press # to access the system with the existing one.
+11:33:22.330 -> Unlock Mode: Type Password to continue
+11:33:28.558 -> WRONG PASSWORD
+11:33:28.558 -> 1
+11:33:28.558 -> Password error. Access Denied.
+11:33:33.847 -> Unlock Mode: Type Password to continue
+11:33:37.950 -> ****
+11:33:40.255 -> Device Successfully Unlocked!
+11:33:40.301 -> Welcome, authorized user. You may now begin using the system.
+11:33:55.889 -> Unlock Mode: Type Password to continue
+11:34:08.394 -> WRONG PASSWORD
+11:34:08.394 -> 1
+11:34:08.394 -> Access Denied. Cannot change password without knowing the previous or default.
+```
+
+### Parts
+
+- Hero Board
+- Type B USB Cable
+- 8 cables (M-F)
+- 8 cables (M-M)
+- Keypad
+- ~~Passive Buzzer~~
+
+## 👩🏻‍💻 Code
+
+- https://github.com/inventrdotio/30DaysLostInSpace/tree/main/Day12-Can_You_Hear_Us
+- https://github.com/robsoncouto/arduino-songs
+
+### Libraries
+
+- https://github.com/Chris--A/Keypad
+- https://www.arduinolibraries.info/libraries/keypad
+
+## 📼 Videos
+
+N/A
+
+## 🔗 Links
+
+- https://inventr.io/
+- https://inventr.io/product/adventure-kit-30-days-lost-in-space/
+- https://inventr.io/courses/adventurekit30dayslostinspace/
+
+## Other Lessons
+
+<?# Markdown ?>
+<?!^ "./../includes/posts/inventr-ak1.md" /?>
+<?#/ Markdown ?>