關於SRF02使用方式

daze

1.硬體方面，能直接將RS232的Rx Tx(輸出為8V~9V)直接接sensor的Tx Rx還  是說需要另外降壓？

2.軟體的部分是直接下command就會work回傳值了嗎?
  (比如說RS232傳84以後，sensor就會回傳值？)


3.command的問題，從spec上來看不清楚command 80~82與 83~85的差異
  還有real ranging 與 Fake Ranging上的差異.

不好意思，因為是第一次解sensor，有許多不清楚的地方還請多多包涵！

imas

1.不行，一般元件所使用的 UART 介面都是 TTL 的訊號準位

2.對

3.

80	0x50	Real Ranging Mode - Result in inches
81	0x51	Real Ranging Mode - Result in centimeters
82	0x52	Real Ranging Mode - Result in micro-seconds

我自己看是覺得差別蠻明顯的，這三個命令將造成不同的回傳數值！

86	0x56	Fake Ranging Mode - Result in inches
87	0x57	Fake Ranging Mode - Result in centimeters
88	0x58	Fake Ranging Mode - Result in micro-seconds

至於80~82與 83~85的差異，原文說明的還算詳細，就請您參考一下原文！

these six commands (80 - 85) are called "Real" because they perform a complete ranging.There is another set of six commands (86 - 91) called "Fake". They are the same as the "Real" commands except that they do not send the 8-cycle burst out. These are used where the burst has been transmitted by another sonar. It is up to you to synchronize the commands to the two sonar's. There is a command (92) to transmit a burst without doing the ranging.


資料參考自廠商技術說明
http://www.robot-electronics.co.uk/htm/srf02techSer.htm