I'm new to this Arduino Forum and hope to find a solution to my problem. First, here is my issue. I'm using an Arduino UNO R3 as a countdown timer and pet treat dispenser manager. The devices connected to the Arduino are, IR sensor, Servo motor, LCD, 7-Segment LED, RTC and a relay. Basically the project works as such...a push button starts a 15 minute count-down routine. After 15 minutes elapses the Arduino sends a pulse to the relay that triggers a door latch solenoid. Every (3) minutes a second timer tells the servo to rotate to dispense a treat. All of this works fine. The issue I am having is that intermittently the Arduino seems to not boot up. Sometimes I need to power cycle the Arduino several times to get it to work. I am using a buck converter to power the Arduino via the +5volt pin. All other devices are powered with a separate power supply. I have tried powering with the barrel jack and also the USB but get the same issue. Is this a known issue with Arduino? I don't believe this is a bad boot routine as the board will boot after several power supply cycles. Any thoughts?
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No.
Why two displays? The LCD can do everything the 7seg can, and more.
That should have been in your list of devices.
You do not need an RTC for a fifteen-minutes and three-minutes timer.
Intermittent is human-caused. Wiggling the wires sometimes makes contact. Show your soldering.
The animal wishes that it would not be the victim because you can't make your toy work.
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Very bad idea as the 5V pin is an output not an input
All other devices are powered with a separate power supply
Do you power them down as well?