Power saving multicolor light

A battery-powered RGB lamp able to detect movement and ambiant light to adapt its behavior.

The behaviour is simple : Once it starts, the first color is red. A push on the button will cycle the color order. The colors are: red, green, blue, pink, orange. After orange, a button press triggers deep sleep. When in deep sleep, lamp can be wake up by button press or movement detection. If ambiant luminosity is too high, the lamp emits a quick blue blink and shut down. If the ambiant luminosity is low, the lamp remain on selected color until no more movement is detected long enough.

The repository contains:

• An Arduino sketch to drive the lamp
• The Kicad schema
• A VeroRoute implantation layout

Software

High level requirements

Identifier	Description
HLR1	PSML button allow to change the color in a set of 5 colors (RED, GREEN, BLUE, ORANGE, PINK)
HLR2	PSML detects ambient light and does not power up if luminosity is more than AMBIANT_LIGHT_TRESHOLD mv
HLR3	PSML wakes up when it detects movement around, and go back to deep sleeps when movement detection ends
HLR4	PSML button allow to change the color in a set of 5 colors (RED, GREEN, BLUE, ORANGE, PINK)
HLR5	PSML transmit its remaning battery level wirelessly, each 15 minutes
HLR6	PSML transmit light intensity wirelessly, each 15 minutes
HLR7	Long press (2 seconds) on push button toggles permanent light mode

Architecture

Components and data

NOTE: data is a value which is exchanged between components

 HW -------------------                    --> BatteryVoltageSensor ------> D_tension_in_mv
 HW -------------------                    --> LuminositySensor ----------> D_luminosity
 HW -------------------                    --> PushButton     ------------> D_ButtonPressed
 HW -------------------                    --> PushButton ----------------> D_ButtonLongPressed
 HW -------------------                    --> TimeCounter ---------------> D_EmitData
 D_tension_in_mv,D_luminosity, D_EmitData  --> X10MessageFactory  --------> D_X10Message
 D_X10Message,D_SendBatteryVoltage         --> X10Encoder ----------------> HW

Hardware

Architecture

                     |--------|
 Battery ----------->|        |
                     |        |
 Presence Sensor --->|        |
                     |        |--> RGB LEDs
 Luminosity Sensor ->|  PSML  |
                     |        |--> 433Mhz transmitter
 Push button  ------>|        |
                     |--------|

• Battery is a 18650
• Light sensor is a simple photoresistor GL5528 (1MΩ)
• Presence sensor is a HC SR501
• Push button is available from outside enclosing device
• PSML itself will be implemented on a Arduino Pro Mini

Identifier	Description
HWR0	Unless specified, all pins shall be set as 'input/pull up' for lower power consumption
HWR1	photoresistor shall be wired on PC0 (A0), configured as analog input, throught a voltage divider using a 10k resistor
HWR2	Presence sensor signal shall be wired on PC4 (Arduino Pro mini A4)
HWR3	Battery (VBatt) shall be wired on Presence sensor signal is wired on PC1 (Arduino Pro mini A1)
HWR4	Battery shall be wired on a DC/DC step up so that Vcc is always 5v
HWR5	433Mhz emmitter shall be wired on PB0 (8) pin
HWR6	The three leds outputs are RED PB1 (Arduino Pro mini '9'), Green PD1 (Arduino Pro mini '3'), Blue PD6 (Arduino Pro mini '6')
HWR7	Leds shall be driver by transistor/MOSFET rather that pins to avoid too high power draw
HWR8	Push button shall be wired on PD2 (Arduino Pro mini '2')

Non functional requirements

Identifier	Description
NFR1	PSML runs on battery and can be charged using micro-USB socket
NFR2	PSML does not start if battery voltage is too low to avoid deep discharge

Constants

Name	Value	Description
AMBIANT_LIGHT_TRESHOLD	122mV	PSML only wakes up under that light ADC measurement
LOW_POWER_MV	2500mV	PSML blinks and does not start normally under this battery voltage