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Discussion Groups | 68HC12 | DKIT 9S12C32 common ground problems / hardware.
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
DKIT 9S12C32 common ground problems / hardware. - Steven Bak - Mar 26 13:35:00 2004
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I have interfaced an ultra-sonic transceiver to my mic. PORTT channel 3 is pulled high to send send the sonic pulse, PORTT channel 7 is polled to recieve the echo. The transcevier measures distances perfectly on two conditions: 1. The common ground is connected to the ground probe of the logic analyzer 2. The power supply of my laptop is connected, and the laptop is connected to the rs-232 of the docking module. If either ground probe, the RS-232 connection, or the power the supply of my laptop are removed, the transceiver stops working. I was wondering if any one knew what could cause this problem?? Maybe some pins are needed to be tied to ground??? Thank you, Steve |
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Re: DKIT 9S12C32 common ground problems / hardware. - Stephen Trier - Mar 26 14:30:00 2004
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Steven, It sounds like the ultrasonic transciever and the HC12 board do not have their grounds tied to each other. The logic analyzer and laptop tie the grounds together via your power outlet, so it works when they are connected. Jumper the transceiver's ground to the HC12 board's ground and see if that fixes the problem. Stephen -- Stephen Trier Technical Development Lab Cleveland FES Center / CWRU / KG8IH |
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