Recent content by RobG

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    Arduino Resets -- Why?

    Hello, all. I have some information to share.. It seems that the LM7805 heats up quite a bit when the relay coil is energized. The relay module draws 60-70mA when energized, as opposed to 3mA when not. So by choosing my input and the NO/NC judiciously, I can draw far less current 95% of the...
  2. R

    Arduino Resets -- Why?

    Reporting back: 1. Capacitors: 100uF on the 12V input; 10uF on the 5V output. 2. Relay: I mis-spoke >> The module is actually based on the SRD-05VDC-SL-C (see below). 3. I don't know what a driver is for a relay module. kpatz: could you please explain? 4. I did not yet measure the current...
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    Arduino Resets -- Why?

    Thank you all very much for taking on my question. I have to be away from this project for a few days, but I will report back ASAP. Again, many thanks!
  4. R

    Arduino Resets -- Why?

    I’m a mechanical engineer who rekindled my interest in electronics. I started a modest project, and I think I’m stuck on a couple small points. The project uses an Arduino as a smart timer which periodically activates a 12V car horn via an relay module based on the “SRD-12VDC-DL-C”. Power is...
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