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README.md
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# ESP32 Dual Machine Activity Notifier
This project turns an ESP32 into a smart device that monitors two machines (e.g., washer and dryer) using light sensors and sends notifications when a cycle starts and finishes. It also displays the current status on an OLED display.
This project transforms an ESP32 into a smart monitoring device. It uses two light sensors to track the activity of machines like a washer and dryer, sending notifications to your phone or desktop when a cycle starts and finishes. A local OLED display provides real-time status at a glance.
## Features
- **Dual Light Sensing:** Monitors two separate devices using two BH1750 light sensors.
- **Status Display:** Shows real-time sensor data and device status on a small OLED display.
- **Notifications:** Sends start and stop notifications to a `ntfy.sh` topic.
- **Real-time Status Display:** Shows current sensor data and machine status on a 128x64 SSD1306 OLED display.
- **Push Notifications:** Sends instant start and stop notifications via a self-hostable `ntfy.sh` topic.
- **WiFi Connectivity:** Connects to your local WiFi network.
- **Non-Blocking Logic:** Uses `millis()` for timing, ensuring the device remains responsive.
## Hardware Requirements
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- SSD1306 128x64 OLED display (I2C)
- Breadboard and jumper wires
## Pinout
## Wiring and Connections
All components use the I2C communication protocol, which conveniently allows them to share the same data (SDA) and clock (SCL) lines.
### I2C Address Configuration
To use two BH1750 sensors on the same I2C bus, they **must** have different addresses. This is a critical step.
- **Sensor 1 (Address `0x23`):** Connect the `ADDR` pin to `GND`. This sets the address to the default `0x23`.
- **Sensor 2 (Address `0x5C`):** Connect the `ADDR` pin to `3.3V`. This changes its I2C address to `0x5C`.
### Pinout Table
| Component | Pin on ESP32 | Notes |
| ------------------- | ------------ | ----- |
| I2C SCL (OLED, Sensors)| GPIO 22 | Shared bus |
| I2C SDA (OLED, Sensors)| GPIO 21 | Shared bus |
| I2C SCL (OLED, Sensors)| GPIO 22 | Shared I2C Clock Line |
| I2C SDA (OLED, Sensors)| GPIO 21 | Shared I2C Data Line |
### Wiring Diagram
```
+-----------------+ +-----------------+ +-----------------+
| ESP32 Dev Board | | BH1750 Sensor | | OLED Display |
| ESP32 Dev Board | | BH1750 Sensors | | OLED Display |
+-----------------+ +-----------------+ +-----------------+
| 3.3V |---------->| VCC |----->| VCC |
| GND |---------->| GND |----->| GND |
@ -58,8 +70,11 @@ This project turns an ESP32 into a smart device that monitors two machines (e.g.
- Click the upload button.
4. **Deploy the Device:**
- Place Sensor 1 inside the first machine (e.g., Washer) to detect internal light.
- Place Sensor 2 inside the second machine (e.g., Dryer) to detect internal light.
- Make the connections according to the wiring diagram, which is quite simple. All 3 peripheral devices communicate over I2C, which lets them share the same 4 wires.
- Place Sensor 1 & 2 on the respective machines such that they only detect light when the device is running. This is specific to each monitored device. The "Start/Stop" button LED is a great candidate for this.
- Make sure to block off any ambient light that might interfere with whatever you're monitoring (e.g. by using a tape).
- Tip: wire the sensors using connectors, so that you can later disconnect the main unit (e.g. for a firmware update) without having to remove the sensors from the monitored machines.
- Tip: use a power socket with a switch to enable/disable the monitoring as needed
## Code Explanation