2. Automated Smart Street Lamp 自動智能街燈¶
2.1. Goal 目標¶
Make a smart street lamp which can automatically turn on when it is getting dark or senses a car coming from afar.
製作一個智能街燈。當天黑或感應到遠處有車輛駛來，自動開啓路燈。
2.2. Background 背景¶
2.2.1. What is a smart street lamp? 什麽是智能街燈¶
Smart street lamp is a lamp which can open automatically when it senses a car coming from afar. Installing an auto-light can help the earth save electricity. When no car passes by, the light will automatically turn off.
智能街燈是指當感應到天黑或遠處有汽車駛來時可以自動打開的燈。安裝自動燈可以幫助地球節省電力。若天够光及當沒有車經過時，燈會自動關閉。
2.2.2. Smart street lamp operation 智能街燈的運作¶
Light sensors should be able to detect the environmental brightness and obstacle Infrared avoidance sensor should be able to detect if there is a car coming. If it is getting dark and there is a car coming from afar, the LED light should turn on, vice versa.
光敏傳感器能檢測環境光度，紅外路障傳感器能檢測是否有汽車駛來。如果天黑了且感應到有汽車從遠處駛來，LED燈應該打開，反之亦然。
2.3. Part List 材料準備¶
Micro:bit （1）
Extension board 擴展板 （1）
Obstacle Infrared avoidance sensor 紅外路障傳感器 （1）
Light sensor 光敏傳感器 （1）
White LED Light 白色LED燈 （1）
3-pin module wire PH2.0轉杜邦綫3P（1）
母對母杜邦綫 Female To Female Dupont Cable Jumper Wire Dupont Line （6）
M3*8mm screw （4）
M3 nut （4）
Screwdriver 螺絲批（1）
module A（1）
module B（1）
2.4. Assembly step 組裝步驟¶
2.4.1. Step 1 第一步¶
Attach light sensor and white LED to A2 model with M3 * 8mm screws and nuts.
將光敏傳感器及白色LED燈安裝在模板A2上，並用M3*8mm螺絲及螺母固定。
2.4.2. Step 2 第二步¶
Put the A2 model onto the A1 model, and put the A1 model onto the A3 model
把A2 模型放到A1模型上，再把A1放在A3上。
2.4.4. Step 4 第四步¶
Attach obstacle Infrared avoidance sensor to B1 model with M3 * 8mm screws and nuts.
將紅外路障傳感器安裝在模板B1上，並用M3*8mm螺絲及螺母固定。
2.5. Hardware connect 硬件連接¶
Connect obstacle Infrared avoidance sensor to P0 port
Connect light sensor to P1 port
Connect LED light to P2 port
將紅外路障傳感器連接到P0端口。
將光敏傳感器連接到P1端口。
將白色LED燈連接到P2端口。
2.6. Programming (MakeCode) 編程¶
2.6.1. Step 1. Disable micro:bit LED. 第一步 停用 micro:bit LED。¶
Snap led enable false to on start 將積木啓用設爲false拖放到當啓動時
Note that P3 is used as LED in default setting, LED need to be disable 注意，P3在默认设置中被用作LED，因此LED需要被禁用。
2.6.2. Step 2. Turn on LED by light sensor and obstacle Infrared avoidance sensor 第二步 使用光敏傳感器和紅外路障傳感器打開 LED¶
Drag forever from Basic 從基本中拖出重複無數次
Snap if statement into forever 將如果語句放入重複無數次中
Set get light value (percentage) at P1 <40 and get motion (triggered or not) at P0 = true, into if statement that says motion is triggered, someone passes by. 在如果語句中設定 get light value (percentage) at P1 <40 和 get motion (triggered or not) at P0 = true。
Then, turn white LED to 1023 at P2 as turning on white LED and pause 10 seconds. 然后，turn white LED to 1023 at P2，打開白色LED並暫停10秒。
Else, turn white LED at P2 to 0 as turning off. 否则，turn white LED at P2 to 0，關閉白色LED。
Full Solution
MakeCode:https://makecode.microbit.org/_Mpriarcg0fJv
2.7. Result 總結¶
An obstacle Infrared avoidance sensor is used to detect the motion of a car. If there is, the LED light will be turned on; otherwise, it will be turned off.
光敏傳感器用戶感應環境光度，紅外路障傳感器用於檢測車輛的運動。如果天黑了而有車輛經過，LED燈將會打開；否則，它將會關閉。
2.8. Think 思考¶
Q1. How can you use the obstacle Infrared avoidance sensor, other than turning on the light automatically?
Q1. 除了自動開燈以外，紅外路障傳感器還能怎麽用？