Hi Melanie,
Thanks for the advise. A reed relay disconnecting the input will do the job. I got one from local electronics supplier. It is 100v 0.5A 500Om coil. I tried to drive it directly of Pic’s pin and it works well. I attached the oscillogram.
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Hi Melanie,
Thanks for the advise. A reed relay disconnecting the input will do the job. I got one from local electronics supplier. It is 100v 0.5A 500Om coil. I tried to drive it directly of Pic’s pin and it works well. I attached the oscillogram.
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Just remember that if it hasn't got a built-in Diode to protect against back-emf spikes, you must add one otherwise you will run the risk of destroying the PIC pin that the coil is connected to.
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For multiple inputs you can look at analog switches (e.g. MAX312 and equivalents). These will require a few additional parts to guarantee the power-up conditions (e.g. pull-ups or pull-downs on control lines).
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Just found one more solution reading this thread http://www.picbasic.co.uk/forum/show...hlight=jswayze
I put 10k resistor in series with the AD pin and changed the PIC to 12F683 or 16F684 (it doesn’t work with 16HV785).
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