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+# line following robot
+
+## @description A basic example of a line-following robot. If you have any ideas, this can provide you with some inspiration.
+
+## ~avatar avatar
+
+Understanding the logic of line-following robots~
+
+## ~
+
+https://youtube.com/shorts/GOhKmu1nFlQ?feature=share
+
+## Duration
+
+Getting it running takes only ten minutes. Afterwards, you can delve into the logic of the line-following code and make optimizations yourself.
+
+
+## Materials
+
+* TabbyBot
+* microbit:bit
+* 1 18650 battery.
+* Line map
+
+
+
+![Materials](/static/mb/projects/line-following-robot/materials.JPG)
+
+## Activities
+
+* [Make](/projects/line-following-robot/make)  
+* [Code](/projects/line-following-robot/code)
+
+## ~button /projects/line-following-robot/make
+
+Let's get started!
+
+## ~
diff --git a/docs/projects/line-following-robot/code.md b/docs/projects/line-following-robot/code.md
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+# Code
+
+## @description code to make the inchworm alive
+
+## ~avatar avatar
+
+Add code to make the inchworm move.
+
+## ~
+
+## Duration: ~30 minutes
+
+## Run logic
+Before starting coding again, everyone can take a look at this diagram, which represents the operating logic of the car.
+![Materials](/static/mb/projects/line-following-robot/run-logic.jpg)
+
+## Step 1: Initialize variables.
+
+``rightSensor``: Infrared sensor on the right
+``leftSensor``: Infrared sensor on the left
+``flag``: Car's operational state
+``lineThreshold``: Trigger threshold, actions are taken when sensor values exceed this value
+```blocks
+let rightSensor = 0
+let leftSensor = 0
+let flag = false
+let lineThreshold = 600
+flag = false
+```
+
+## Step 2: Change the car's state.
+
+When button ```A``` is pressed, set the ```flag``` to the opposite state.
+```blocks
+input.onButtonPressed(Button.A, function () {
+    flag = !(flag)
+})
+```
+
+# Step 3: Line following
+
+Set wheel states accordingly based on sensor values.
+
+
+```blocks
+basic.forever(function () {
+    leftSensor = tabbyRobot.line(tabbyRobot.LeftRight.LEFT)
+    rightSensor = tabbyRobot.line(tabbyRobot.LeftRight.RGIHT)
+    if (flag) {
+        if (leftSensor >= lineThreshold && rightSensor >= lineThreshold) {
+            tabbyRobot.motorRun(20, 20)
+        } else if (leftSensor < lineThreshold && rightSensor >= lineThreshold) {
+            tabbyRobot.motorRun(15, 60)
+        } else if (leftSensor >= lineThreshold && rightSensor < lineThreshold) {
+            tabbyRobot.motorRun(60, 15)
+        } else {
+            tabbyRobot.motorStop()
+        }
+    } else {
+        tabbyRobot.motorStop()
+    }
+})
+```
+
+# Complete program
+```blocks
+input.onButtonPressed(Button.A, function () {
+    flag = !(flag)
+})
+let rightSensor = 0
+let leftSensor = 0
+let flag = false
+let lineThreshold = 600
+flag = false
+basic.forever(function () {
+    leftSensor = tabbyRobot.line(tabbyRobot.LeftRight.LEFT)
+    rightSensor = tabbyRobot.line(tabbyRobot.LeftRight.RGIHT)
+    if (flag) {
+        if (leftSensor >= lineThreshold && rightSensor >= lineThreshold) {
+            tabbyRobot.motorRun(20, 20)
+        } else if (leftSensor < lineThreshold && rightSensor >= lineThreshold) {
+            tabbyRobot.motorRun(15, 60)
+        } else if (leftSensor >= lineThreshold && rightSensor < lineThreshold) {
+            tabbyRobot.motorRun(60, 15)
+        } else {
+            tabbyRobot.motorStop()
+        }
+    } else {
+        tabbyRobot.motorStop()
+    }
+})
+```
+
+## ~ hint    
+After downloading the program, place the car on the track, then press the ```A``` button to start line following.
+## ~
\ No newline at end of file
diff --git a/docs/projects/line-following-robot/make.md b/docs/projects/line-following-robot/make.md
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+# Make
+
+## @description Explanation of the accessories.
+
+## ~avatar avatar
+
+Manufacture of the necessary equipment completed.
+
+## ~
+
+## Duration: ~5 minutes
+
+## Car
+
+Assemble the battery and micro:bit onto the car. Just pay attention to the direction.
+
+![](/static/mb/projects/line-following-robot/assembly-car.JPG)
+
+Sensor used for detecting lines, corresponding to both sides behind.
+![](/static/mb/projects/line-following-robot/back.JPG)
+
+## Line map
+
+Suggest printing the picture on A3 paper, or you can use electrical tape to draw the route yourself on a light-colored surface.
+![](/static/mb/projects/line-following-robot/line-map.JPG)
+## It's ready!
+
+Your inchworm is ready!
+
+![](/static/mb/projects/line-following-robot/ready.JPG)
+
+## ~button /projects/line-following-robot/code
+NEXT: Code
+## ~
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