homebridge-lightsensor-analog

Analog light sensor service for Homebridge

Reads from an analog-to-digital SPI chip using mcp-spi-adc,
and represents the value as an ambient light sensor light level.

Installation

1. Install Homebridge using npm install -g homebridge
2. Install this plugin npm install -g homebridge-lightsensor-analog
3. Update your configuration file - see below for an example

Connect an MCP SPI ADC chip to your computer, and a photodiode or other analog light sensor
to one of the channels of the ADC.

Configuration

* accessory: "LightSensorAnalog"
* name: descriptive name
* chip: one of: MCP3002, MCP3004, MCP3008, MCP3202, MCP3204, MCP3208, or MCP3304
* channel: channel number of ADC chip to read from
* options: options for mcp-spi-adc
* scale: value to multiply the raw 0.0 - 1.0 analog value with
* offset: value to add to the raw 0.0 - 1.0 analog value

Homebridge expects a value in lux, you can adjust scale and offset
to calibrate the analog sensor value (currently only linearly) empirically.

Example configuration:

``json
"accessories": [
{
"accessory": "LightSensorAnalog",
"name": "Kitchen",
"chip": "MCP3304",
"channel": 7,
"options": {
"speedHz": 20000
},
"scale": 500,
"offset": 0
}
]
``

See also

* 10der/homebridge-LightSensor: currently blank (in progress?), created 2016/09/17
* lagunacomputer/homebridge-CurrentAmbientLightLevel: plugin for I2C-based bh1750 digital light sensor

License

MIT