Difference between revisions of "Beacon3"
From Hackstrich
(PCA9545 is awesome looking) |
(Minor updates.) |
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| − | Beacon3 will be a beacon for the top of our flag(less) pole for Burning Man 2011. It will be simpler than [[Beacon2]] as time is limited to get it done, but we want a brighter beacon. | + | Beacon3 will be a beacon for the top of our flag(less?) pole for Burning Man 2011. It will be simpler than [[Beacon2]] as time is limited to get it done, but we want a brighter beacon. |
== Ideas == | == Ideas == | ||
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*** Same light sensor and (lack of) charging circuitry as [[Beacon2]] can also be used | *** Same light sensor and (lack of) charging circuitry as [[Beacon2]] can also be used | ||
*** Regulator on planar will only be needed for wireless functionality, MCU can operate over whole battery range as can LED drivers | *** Regulator on planar will only be needed for wireless functionality, MCU can operate over whole battery range as can LED drivers | ||
| − | *** | + | **** '''Figure out how to level shift for the XBee (MCU running at battery voltage, XBee needs 3.3V)''' |
| + | *** Will use an ATmega328p for the MCU, makes it Arduino-compatible | ||
** 4 RGBW LED units on Star boards and heat sinks at 12, 3, 6, and 9 | ** 4 RGBW LED units on Star boards and heat sinks at 12, 3, 6, and 9 | ||
*** Current thought is Cree MC-E ~2.5W per component colour RGBW LEDs | *** Current thought is Cree MC-E ~2.5W per component colour RGBW LEDs | ||
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== Project Status == | == Project Status == | ||
| − | 2011-07-19: Initial design started. | + | * 2011-07-19: Initial design started. |
| + | * 2011-07-23: Schematic for LED driver board started and almost completed. | ||
[[Category:Current Projects]] | [[Category:Current Projects]] | ||
Revision as of 11:31, 23 July 2011
Beacon3 will be a beacon for the top of our flag(less?) pole for Burning Man 2011. It will be simpler than Beacon2 as time is limited to get it done, but we want a brighter beacon.
Ideas
- Beacon Unit
- Same enclosure as Beacon2 can be used to save time, just remove PCBs and replace with these
- Planar PCB that fits onto the spindle, which the other boards plug into vertically
- Single MCU this time, as there are fewer LEDs
- Same light sensor and (lack of) charging circuitry as Beacon2 can also be used
- Regulator on planar will only be needed for wireless functionality, MCU can operate over whole battery range as can LED drivers
- Figure out how to level shift for the XBee (MCU running at battery voltage, XBee needs 3.3V)
- Will use an ATmega328p for the MCU, makes it Arduino-compatible
- 4 RGBW LED units on Star boards and heat sinks at 12, 3, 6, and 9
- Current thought is Cree MC-E ~2.5W per component colour RGBW LEDs
- 4 RGBW LED driver boards (custom) at 1:30, 4:30, 7:30, and 10:30
- 4x NXP SSL3250A chips on each board looks good to drive the RGBW LEDs
- Will drive them at 200mA per component colour constantly, and 500mA flashes of 820mS
- This chip has a fixed I2C address though so an I2C mux would be needed on each LED board
- The PCA9545 looks perfect for this, I2C controlled 4:1 I2C mux and can be "turned off" so that there's no need for a planar mux
- 4x NXP SSL3250A chips on each board looks good to drive the RGBW LEDs
- Remote Control Unit
- Having a remote that would make the beacon extra-noticeable when a button was pressed would be cool
- To get long enough range to be useful, we'd want ~50mW
- XBee is probably the best way to go, but need to look at power draw for the RX side and would have to custom-design a remote control unit
- Remote Control Unit could just be:
- Arduino Fio
- XBee Series 1 RP-SMA (plugs directly into Arduino Fio)
- Rubber-duck antenna
- LiIon pack (plugs directly into Arduino Fio)
Project Status
- 2011-07-19: Initial design started.
- 2011-07-23: Schematic for LED driver board started and almost completed.
