I want to build a motion sensor that alerts me over wifi when it detects motion. What sort of microcontrollers are appropriate for that task?
There are many microcontrollers that would be appropriate for building a motion sensor that alerts you over Wi-Fi when it detects motion. Some popular options include:

- Arduino: Arduino boards are popular microcontrollers for DIY projects and are widely used in motion sensor projects. They are relatively easy to use, affordable, and have a large community of users who share their projects and code.

- Raspberry Pi: Raspberry Pi is a popular microcontroller that offers more processing power and versatility than Arduino. It can run full operating systems like Linux and can be used for a wide variety of applications, including motion sensing and Wi-Fi connectivity.

- ESP32: ESP32 is a low-cost microcontroller that offers built-in Wi-Fi and Bluetooth connectivity, making it ideal for IoT projects like motion sensing. It also has a large community of users and offers a wide range of development boards and modules.

- Particle Photon: Particle Photon is a cloud-connected microcontroller that is designed for IoT projects. It offers built-in Wi-Fi connectivity and easy integration with cloud services, making it an ideal choice for motion sensing projects that require remote connectivity.

- BeagleBone Black: BeagleBone Black is a powerful microcontroller that offers more processing power and memory than Arduino or Raspberry Pi. It can run full operating systems and can be used for a wide range of applications, including motion sensing and Wi-Fi connectivity.

Ultimately, the choice of microcontroller will depend on the specific requirements of your project, such as the required processing power, connectivity, and available resources. It's important to do some research and choose a microcontroller that meets your specific needs and requirements.
Start explaining how to proceed with : Arduino: Arduino boards are popular microcontrollers for DIY projects and are widely used in motion sensor projects. They are relatively easy to use, affordable, and have a large community of users who share their projects and code.
To create a motion sensor with an Arduino that alerts you over Wi-Fi, you will need the following components:

1. Arduino board (e.g., Arduino Uno)
1. PIR (Passive Infrared) motion sensor
1. ESP8266 Wi-Fi module (or an Arduino with built-in Wi-Fi like the Arduino MKR1000)
1. Breadboard
1. Jumper wires
1. Micro USB cable

Here are the steps to set up the project:

1. Connect the PIR motion sensor to the Arduino:
    - Connect the VCC pin on the motion sensor to the 5V pin on the Arduino.
    - Connect the GND pin on the motion sensor to a GND pin on the Arduino.
    - Connect the OUT pin on the motion sensor to a digital input pin on the Arduino (e.g., pin 2).

1. Connect the ESP8266 Wi-Fi module to the Arduino:
    - Connect the VCC pin on the ESP8266 to the 3.3V pin on the Arduino.
    - Connect the GND pin on the ESP8266 to a GND pin on the Arduino.
    - Connect the TX pin on the ESP8266 to the RX pin (digital pin 0) on the Arduino.
    - Connect the RX pin on the ESP8266 to the TX pin (digital pin 1) on the Arduino.

1. Program the Arduino:
    - Install the Arduino IDE and the required libraries for the ESP8266.
    - In the Arduino IDE, create a new sketch and include the required libraries for the ESP8266 Wi-Fi module.
    - In the setup() function, initialize the serial communication, the Wi-Fi module, and configure the PIR motion sensor input pin.
    - In the loop() function, constantly monitor the state of the motion sensor. If motion is detected, send a notification over Wi-Fi using the ESP8266 module.

1. Set up the Wi-Fi notification:
    - Choose a method for receiving notifications, such as an email, push notification, or SMS.
    - Find a suitable online service (like IFTTT or Pushbullet) that supports your desired notification method and has an API that can be used with the Arduino.
    - In the Arduino sketch, add the necessary code to send an HTTP request to the chosen online service API when motion is detected.

1. Upload the sketch to the Arduino using the micro USB cable and test the motion sensor.

After completing these steps, your motion sensor should be able to detect motion and send a notification over Wi-Fi using the ESP8266 module. If you encounter any issues, consult online resources and Arduino community forums for troubleshooting and support.