狗狗喂食提醒灯

I used an Arduino Nano Every for this project, in conjunction with an RTC Chip DS3231 and a few lights. The face of the light is the button itself, and it relies on a limit switch to both sense a press event and as a spring to keep the button face pushed out. The lights were random RGB LEDs I had lying around, use whatever you want, I suggest at least two LEDs or a strip around the whole interior to provide adequate and even light.

Arduino Nano Every: https://www.amazon.com/gp/product/B07VX7MX27/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
HiLetgo LimitSwitch: https://www.amazon.com/gp/product/B07X142VGC/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
AITRIP DS3231: https://www.amazon.com/gp/product/B09KPC8JZQ/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Unfortunately, I have lost the wiring diagram, but with a little googling it should be pretty easy to figure out, basically just run power to the Arduino (I used a micro USB cord) and run power and communication lines from the Arduino to the DS3231. The Limit switch can be an analog or a digital input, I'm sure there is a "proper" one but you can definitely make either work, and the RGBS depends on which type you have, but mine were simply run as outputs from the Arduino, with each color channel being its own output so I could control the color.

Well, I don't want to post my code because it is pretty horrendous. After setting the RTC using the standard library (you run the sketch provided in the library and enter the time in a specific format on the serial channel), I basically just had it loop every minute or so and if the time reported from the RTC matched a specified feeding time, turn the light on and keep on running the loop. If the button was pressed (checked for in the main loop) it turned the light off and then had a small delay to deal with someone holding the button down for a few seconds.

There is a more elegant way of doing this that involves a built-in "alarm" function of the RTC, but I struggled to get it working reliably so went for the simpler but messier version above. Let me know if you get it working. On a similar note of RTC functions that don't seem to work, my clock definitely did not change for Daylight savings time, but our dog doesn't really care when she gets her dinner so we just started feeding her later.

I chose to have breakfast and dinner be two different colors just because.

I used a lightweight copy paper on the backside of the button face to act as a diffuser, with just some scotch tape holding it on.

The lid doesn't have built in screw holes for ease of printing, nor does it have a set stop, as I wasn't sure what height would be optimal for the limit switch to keep constant pressure on the button face. I happened to have a small enough drill bit to make a clearance hole on the lid and a threadable hole in the base, and used a few M3 screws to hold it all together. You could also heat up a paper clip and press it through the parts to have a similar effect. If I remember correctly the lid might interfere with the power cable slightly, I just sanded a little bit out to get the perfect fit.

You can see in the electronics photo that my clips to hold the LEDS did not work very well, they were a little too thin and snapped. I found that the hot glue worked wonders, and as an added benefit helped diffuse the light even more.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.

You could definitely do more stuff with this, like use it for your own meds or chores or whatever. You could also have it connected to the internet and ping your phone, or ping your phone after "X" time since the light turned on has passed, but we didn't need those features and I am all about minimizing work.