🔴 You Got MAIL ! - DIY Mail Notification System - No.1282

I build a mailbox notification system using an ESP32 which connects over WiFi to send email notifications of new mail arriving.

It uses the Arduino IDE and the ESP32 Mail Client, and obviously an ESP32 microcontroller.

*Parts Used*

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#Mailbag
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Heathkit IT-12 Signal Tracer.

[Chained_Unicorn]

Nice. I did a similar thing with an 'intruder detector' (IR sensor & ESP32). Latches on when the IR triggers, sends a message then turns the latch off. Email is a bit last decade though 😜 You can create a Telegram bot and get the ESP to send instant messages. Does the same thing as an email of course and like your email, each person would need to create a Telegram bot to make it themselves, but it has the veneer of being more modern, plus you don't need to wait until your phone checks for email (e.g. mine is set for hourly checks).

The other thing I thought while watching this was why use a relay and not just make a solid state latch? A P-Channel Mosfet, a transistor and maybe a diode. No moving parts.


Hopefully a couple of alternate ideas or even improvements (that don't improve it that much 🤣)

[tomschmidt]

Interesting project, great job monitoring snail mail. We have a similar problem as you as our mailbox is 600 feet (180 M) from the house and on the opposite side of the road. I went a lower tech route. Once our residence was upgraded to fiber I repurposed the old landline copper cable for a DIY mailbox alert. At the mailbox I used a cheap on/off key fob transmitter. I installed a magnetic switch to detect the door being open and closed. A little bit of hardware kludge logic to convert that to simulate pressing the on and off buttons. On the other side of the road on our property I mounted the receiver on the utility pole and used the old telephone wire to link it to a controller in the house.

When snail mail arrives it sends an email to me and also an email that is interpreted as SMS on my cell phone. We still have a landline phone so next to the phone in the kitchen I mounted a little indicator, green when mail arrives and flashes red/green if the mailbox door is left open. There is a pushbutton to clear the alert to ready the system incase there are multiple mail deliveries that day and the system is automatically reset at night.

Great being able to monitor battery condition, that is something mine cannot do as is is only on/off.

[zebo-the-fat]

Nice, would it not be a good idea to put a diode across the relay coil to suppress the voltage spike when the coil de energises?

[chinese]

Hello!! is there a tinkercad circuit diagram for this?