我想製作一個倒數計時器...20分

呢個啱嗎？

圖片參考：http://www.szutk.com/Product/UM5140-TU1.GIF

http://www.szutk.com/Product/UM5140-TU.pdf
http://www.szutk.com/Product/UM5140-STD.pdf
http://www.szutk.com/DOWNLOAD.HTM
仲有呢個


圖片參考：http://www.shebei114.cn/picture/anly2008/1230582007328102715.gif






圖片參考：http://www.hlc.com.sg/images/prod_control_anly_multi.jpg

Multi Range
Analogue Timer

圖片參考：http://www.hlc.com.sg/images/prod_control_anly_counter.jpg

Preset Counter


圖片參考：http://www.hlc.com.sg/images/spacer.gif


圖片參考：http://www.hlc.com.sg/images/spacer.gif


圖片參考：http://www.hlc.com.sg/images/spacer.gif



圖片參考：http://www.hlc.com.sg/images/prod_control_anly_digital.jpg

Digital Timer




圖片參考：http://www.hlc.com.sg/images/prod_control_anly_program.jpg

Programmable Timer


圖片參考：http://www.hlc.com.sg/images/spacer.gif






Solid-state Multi-functional Timers

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_193.jpg
H3CR-A

DIN 48 48-mm State-of-the-art Multifunctional Timer


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_194.jpg
H3CR-F

DIN 48 48-mm Twin Timer


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_1890.jpg
H3CR-G

DIN 48 48-mm Star-delta Timer


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_1891.jpg
H3CR-H

DIN 48 48-mm OFF-delay Timer


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_195.jpg
H3M

Solid-state Timer with Variable Time Ranges


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_196.jpg
H3Y

Miniature Timer Compatible with the MY Relay


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_197.jpg
H3YN

Miniature Timer with Multiple Time Ranges and Multiple Operating Modes


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_198.jpg
H3RN

Ultra-slim Timer for G2R Relay Socket


Mechatronic Analog Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_199.jpg
H3AM

Large Setting Dial and Moving Pointers Ideal for Easy Operation and Monitoring


Solid-state Multi-functional Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_200.jpg
H3DE-M / -S

DIN Track Mounted, Standard 22.5-mm Width Timer Range, Multi-functional Timer


Solid-state Twin Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_1719.jpg
H3DE-F

DIN Track Mounted, Standard 22.5-mm Width Timer Range, Twin Timer


Solid-state Star-delta Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_1720.jpg
H3DE-G

DIN Track Mounted, Standard 22.5-mm Width Timer Range, Star-delta Timer


Solid-state Power OFF-delay Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_1721.jpg
H3DE-H

DIN Track Mounted, Standard 22.5-mm Width Timer Range, Power OFF-delay Timer


Solid-state Timer

圖片參考：http://www.ia.omron.com/product/thumbnail/family/m_201.jpg
H3DS

市面有的電子手錶，有 Timer 功能可以 set 1 分鐘，如果自己做會貴又煩。
自己做要先做：振盪器、counter 、推個 display ......。
或者去 "鴨記" 睇吓好似有現成貨。