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I too have had this problem with a Mega. It was working with my SCADA package, running on linux and you could ping the Mega/ Ethernet board, but then something changed, and it wouldn't run/ read using the ehternet port. Had two units, and both behaved the same. When connected to the programming laptop ( runing W7) and the ethernet port, and running serial ...


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This looks like something out of an Arduino n-part “sensor kit”. It’s hard to tell because the quality of the image is not very good. My guess is, this is an analog temperature sensor, like in this link, part number 18. You can also find an example sketch there.


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Either set the watchdog to 8s, and setup the WDT interrupt. And deal with the fact that the MCU wakes up every 8s. You could have it go back to sleep, unless a button is pressed, or something. The extra power usage for these short wakeups is negligible in most cases. Or disable the watchdog right before sleeping, and enable right after waking up. And hope ...


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When you sleep the Arduino is locked up. So yes, the watchdog timer will time out and reset the Arduino. But, since you're in sleep mode, it's not so much a "reboot" as a "wakeup". The watchdog timer is one of the normal ways of waking up periodically to do things. If you want to use the watchdog for its other "anti-lockup" purpose then you will have to ...


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"Arduino Pro Mini hooked up to the 5V power supply via the RAW and GND pins, but the supply is a regulated 5v wall supply. " That is the problem. RAW pin expects more like 6V to 6.5V for the regulator to output 5V. If you are supplying 5V, connect to the 5V, or VCC and GND pins. If you are connecting to USB via an FTDI Basic or equivalent, and the 5V ...


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Power supply was dropping to 3.8 volts under basic load, once it turned on some LEDs it was just too low to activate the relay switch. Crappy Chinese parts.


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I connected Lipo battery to device. On power outages it supply power to board and brown out problem solved. Thanks a lot


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