ober WROTE:Yup, sich mistakenly thought everyone have the options to upload attachment. Anyway he has change the setting, "now everyone can attach"
From the schematic, you only need to control the On/Off switch to activate the transmitter. Wanted to control using computer? If you have parallel port it will be quite easy.
But I think most of the desktop and laptop does not come with parallel port, Using USB to UART converter can help too as you need one output only. I think you should be able to control the RTS/CTS to activate a transistor to ON/OFF the ultrasonic circuit.
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