HOW to Make a Track Alarm with KidsIOT

Flow

Assembly

Required Parts

Place the pressure sensitive area of the sensor on a firm, flat surface when in use. For details, please refer to Chapter 3.6.

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

Step 9

Completed

Wiring Diagram

Test Code

Open KidsBlock and connect the board to your computer. Click File –> Load from your computer.

Choose D:\Code\2.Code_kidsIOT to open 4.3Track alarm.sb3 file.

Click to connect to port and then .

Explanations

Conceive:

When someone steps on the pressure sensing area of the sensor, the output analog value of the sensor will decrease.

Set a threshold first to determine whether there is pressure. When the output value is smaller than the threshold, someone steps on this area; If the value is greater than the threshold, no track is detected.

If pressure is detected, a footprint icon will be displayed on the dot matrix.

Build blocks:

1. Initialization: initialize the dot matrix and set the pin of the thin film pressure sensor.

   

2. Loop.

   Determine whether the output analog value is smaller than 3000 (if yes, tracks are detected).

   • analog value < 3000: the dot matrix shows a footprint icon as a reminder.

   • analog value ≥ 3000: the dot matrix displays nothing.

   

Test Result

After uploading code, press the thin film with your finger, and you will see the dot matrix shows a footprint.