How To: Forget ChimesMake Your Doorbell Send You Text Alerts Whenever Someone Rings It
Want to know when you have a visitor, even if you're not home? You could always set up a security system and live-stream it with your iPhone. But if you don't have a spare iPhone, or just don't want to go to the trouble, this simple hack will add text message alerts to your doorbell so that it lets you know when someone's there.With just a regular, cheap doorbell, his 'Funky' sensor, and a few lines of code, Martin was able to make his doorbell send an SMS message and email whenever someone rings it. Here's what the setup looks like: Image via harizanov.com Martin's doorbell has a green LED that flashes when the doorbell is rung, so he set it up to pull a pin that triggers the sensor. The sensor stays asleep until the pin is pulled, then it wakes up and sends an alert to OpenEnergyMonitor. From here, Martin set up his email account to forward the message to an email2sms gateway.You can find the code for this project on Github, and more information on the setup on Martin's blog.I imagine this is a pretty good option when you're expecting a must-sign-for-package and you don't want to be confined to the inside of your home to listen for the bell. Want something even better? Try out a doorbell that calls your cell and lets you talk to them on the intercom—from anywhere. If it's guests you're expecting, maybe you'd rather just give them access with a programmable RFID lock.
The acid in lemons works like regular battery acid to create an electrolyte reaction with the metals that produces power. Simply make a positive and negative electrodes that connect to the lemon acid with a couple household items, and test. If you have a multimeter handy, you can visibly measure the lemon power output in this simple voltaic
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Radio making runs in my family. My Grandpa Charlie made his own radios in the 30s and during the war as well. In fact, in a recent email, he mentioned that they were encouraged to make radios and "learn by doing." Radios were the hottest technology of the time and after the exhilaration of getting this radio work, I can understand!
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According to the link below, Android Pie has the temperature on the lock and ambient/peek screens. I have a new Moto X4 non-Android One "standard" version from Amazon (not the Prime version) on Pie and don't have them there, and would like to (it is on the home screen on the Time and Temp widget, but not on the lock or ambient screens).
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