There are some pretty cool smart doorbells out there, but they are expensive and the basic components of a wireless button, camera and a small computer are cheap! In fact the most expensive component in this project is the camera module, which is still a bargain at sub 20 USD.
An overview of the system is shown in Figure 1. When someone pushes the doorbell button, the button module transmits a 433 MHz RF signal to a receiver (not show) which sounds a chime. However, the RF signal can be freely intercepted (not ideal for security but pretty convenient), and here an RF module attached to a Raspberry Pi is used to intercept the RF signal. On receiving the signal, the Pi takes an image using the camera. This image can then be sent as a mobile notification, for example using the Telegram app. In this project, I actually send the image to my home automation system, Home-assistant.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.