https://github.com/andrewl/motion-detector
Motion detection and Slack notification for Arduino/ESP8266
https://github.com/andrewl/motion-detector
arduino esp8266 iot motion-detection slack
Last synced: 2 months ago
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Motion detection and Slack notification for Arduino/ESP8266
- Host: GitHub
- URL: https://github.com/andrewl/motion-detector
- Owner: andrewl
- License: mit
- Created: 2020-10-21T21:18:00.000Z (over 5 years ago)
- Default Branch: main
- Last Pushed: 2024-04-17T18:30:51.000Z (about 2 years ago)
- Last Synced: 2025-05-17T04:06:49.647Z (about 1 year ago)
- Topics: arduino, esp8266, iot, motion-detection, slack
- Language: C++
- Homepage:
- Size: 289 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
Motion Sensor to Slack Notification
==
What is this?
--
This shows you how to hook up some low-cost hardware to periodically send a message to Slack if motion was detected recently.
Why?
--
We have an elderly relative who recently had a fall necessitating hospital treatment. This is a simple solution to help assure us that they're still moving around - but without being as intrusive as a camera might be.
Couldn't you buy something to do this?
--
I did. A D-Link or TP-Link something or other with [IFTTT](https://www.ifttt.com) integration through the vendors app.
But the manufacturer withdrew support after 18 months though and now it's just more [e-waste](https://en.wikipedia.org/wiki/Electronic_waste)
OK, How do I build one?
--
*Hardware*
You'll need
- a [Wemos D1](https://www.wemos.cc/en/latest/d1/d1_mini_lite.html) or similar board (there are plenty of clones available)
- a PIR sensor, such as https://shop.rasp.io/products/pir-motion-sensor-2
It's a really simple build, you don't even need a breadboard or resistors.
1. Attach the PIR sensor to the board as per the schematic below.. You just need to connect the 5v, ground and a digital pin that has no internal pull-up (so that by default if reads LOW - D0 on a Wemos D1 is a good choice).
2. Set the delay setting on the sensor to minimum (consult your sensor's documentation - but with these sensors there's often a screw-type adjustment on them to alter delay and sensitivity.)
*Software*
1. Install the [Arduino IDE](https://www.arduino.cc/en/software) with the ESP8266 board package.
2. Copy secrets.EXAMPLE.h to secrets.h and fill in your WiFi credentials and Slack webhook URL. These are the **initial** defaults — all settings can be changed later via the web UI without reflashing.
3. Compile and upload the sketch to your board.
Running
--
After powering on the device it will connect to WiFi and start a web server, then wait 1 minute for the sensor to warm up. During warmup the web UI is already accessible.
It then polls the sensor every 5 seconds — if motion is detected it lights the internal LED and notes that motion has occurred.
At the end of each notification interval (default: 1 hour) it sends a message to the webhook reporting whether motion was detected. The number prefixed to each message is the uptime in seconds, useful for remote debugging.
Web UI
--
The device runs a small web server on port 80. Find its IP address in the Arduino IDE Serial Monitor at startup, then open it in a browser.
**Status page** (`http:///`) — auto-refreshes every 10 seconds and shows:
- Whether motion is being detected right now
- Whether motion has been detected since the last notification
- Time until the next notification
- Uptime, WiFi network, and IP address
- Number of messages pending in the outbox queue
**Config page** (`http:///config`) — lets you change all settings without reflashing:
- Primary and secondary WiFi credentials
- Webhook host, endpoint path, and API key
- Notification interval (in minutes)
Saving the config page restarts the device and applies the new settings immediately. Settings are stored in EEPROM and survive power cycles; secrets.h is only used as the initial default on a fresh flash.