​​LASS - Flood Monitoring（淹水感測）- 系統帶起步驟與過程
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​​系統帶起紀錄
  • ​​3G SIM 卡已買。 1.2Gbytes 易付卡，需於兩個月用完，可加值
  • ​​水位感測器已購買 XL-MaxSonar-WR1, 已到貨
  • ​​LinkItONE GPRSUdpNtpClient Test PASS
  • ​​LinkItONE SPI/SD selection doesn't matter. SIM 卡的缺角處靠近 JTAG 
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​​Setup()
​​Connected to wifi
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​​Starting connection to server...
​​setup() done
​​sendNTPpacket
​​48
​​packet received
​​2416E30000000041435453DAA64E881EA495200000000DAA64E98FD111B63DAA64E98FD119EA7
​​Seconds since Jan 1 1900 = 3668332184
​​Unix time = 1459343384
​​The UTC time is 13:09:44
  • ​​超音波感測器到貨
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User-uploaded image: Sonar.jpg
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​​Arduino Distance Detection with MaxSonar ultrasonic rangefinder
​​MB7001 datasheet
​​MaxSonar Arduino sample code
​​LV‑MaxSonar‑EZ®  Quick Start Guide
​​連最簡單的 Analog output 都量不到，檢查
  • ​​V,G 有給，焊接沒有短路
  • ​​3.3V/5V 試過，AN 都有值，
  • ​​5V ADC 量到最低值為 20, 距離更近量到的值都很大，5.0/1024*20*1000/9.8 =25 inch 
  • ​​Current spec: Operates on 3.0V – 5.5V. The average (and peak) current draw for 3.3V operation is 2.1mA (50mA peak) and 5V operation is 3.4mA (100mA peak) respectively. Peak current is used during sonar pulse transmit
  • ​​USB 規範的電壓為5V 最大電流為500mA
  • ​​用 Arduino 給電測試，AN 有電壓變異，但是不太跟距離有管連
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