This is not the description of a success story, it is in the fact the begging of a new project... maybe there should be a forum for new projects... ;-)
I have a friend (Benoit) that is in a speleology club and they are modeling a famous cave in the Vercors-Isere called 'Le trou qui souffle'. They want to make a map where it is possible to follow the position in the caves using LEDs. Around 100 to 150 LEDs.
So I'm thinking on usint the JeeNode or JeeLink as the inteligent module behind the LED driving. And something like the I2C multiple I/O chip to make the LEDs go on and off. If someone has any good ideas on how to do this, they're well come!
The specs are pretty simple:
- Make each of the (lets say) 160 LEDs on and off individually
- (optional) control the light power of the LEDs globally (all brighter or lighter)
- the LED controller is connected to a PC and receives the commands from the PC to power on / off each LED
- the LED controller pools a collection of push buttons that will light a group of LEDs corresponding to a cave (the cave definition will be set by the PC at start up)
So the complete system will be:
- LED controller API that will be used by the application running in the PC
- LED controller and its firmware (JeeNode or JeeLink and some lines of code ;-)
- LED driver circuit
For the API and firmware parts I can handle it, no big deal. I have less experience in the LED driving part so if any one can help I'll be very happy!
Cave map pointer using LEDs(4 posts) (2 voices)
Hello all,Posted 2010-01-17 ago #
10 of these? http://www.nxp.com/documents/data_sheet/PCA9635.pdf - can control brightness of each LED
See page 23 for an example on how to drive multipel LEDs off a higher voltage. Using 12 V you could even control 80 LEDs with one chip, dimming in groups of 5...Posted 2010-01-17 ago #
I'm low on spare time right now... sorry for the late reply here...
It looks exactly what I need, the PCA9635. If you're thinking on a new plug with it I'm looking forward for it ;-)Posted 2010-01-25 ago #
Hello all, We are finally back to the cave map project! All electronic parts received (JeeNode USB and 8 Dimmer modules) and connected together. I made a test application that dims in and out all LED outputs but the LEDs are not connected yet so we had to test each of the LED outputs individually using one LED and some wires. We realized that in all Dimmer modules only LEDs 0 to 7 are working and not LEDs 8 to 15... I'm using an old version of the Ports and Dimmer libraries... anyone had this problem before?Posted 2011-01-12 ago #