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Wireless light controller. Wireless hub repeater. Wireless video camera systems.

Wireless Light Controller

wireless light controller

fotoopa D100 0879

fotoopa D100 0879

Front panelview for the 3D hardware box. In front the temporarily layout design. The most big part of the surface ( left side) is assign to the 10xAA batteries. the right side contain all the buttoms, switches, control leds and 2 big switches for the EV value adjust of the local and wireless remote flashes. On the bottom, multiple connectors must be placed.
As you see there are multiple holes. All electronic parts are into this unit

The electronics contain 3 big parts. The central unit is the CPLD board MAX II from terasic at 50MHz and is the most powerfull part. All timings for highspeed detection, camera synchronisation, flashes drive and wireless remote drive of the extra background flashes. The display unit and the local flash power TTL drive are provided via the ATmega328p controller. The IR detection contain a separate controller with the ATtiny45 chip. This controller measure in 40 usec if an object come in focus and give the information through the CPLD module. The sensivity level on the CPLD module determine if the camera's need to activated. The current version can also work in burstmode. If an insect stay longer in focus multiple pictures can be taken. I will test this and set the rate at 3 pictures/sec to start. But the camera's can shoot faster if needed.
There is also a timerkeeper chip, I need it to return in good time at home for the dinner. 4 extra AA batteries are added to work at night to drive the high power leds. The normal autonomy of the batteries will be near 4 hours.

The wireless build in unit can drive 4 extra remote flashes in TTL mode. The transmitter works at 868MHz, the european frequence range. The power of all the flashes are controlled into this central unit, even the remote flashes. A special knob let me quicly change 5 steps of 1/3 EV value just by a simple turn. This is helpfull by full white flowers or black objects. The camera's stay always into manual mode, there is no time to measure the environment light. The wireless unit is already tested to a distance over the 30m. But for this type work, the distance is max a few meter. This will help for better background.

I have planned 1 week to write the new program, verilog part for the CPLD board and assembler for the ATmega328p controller chip.I know this is very short but multiple parts are done before. The logic analyser help me to test all the hardware and the software and to readout the correct timings even at nsec level.

So the 3D setup is on on time as planned. Hope to be ready third week of March.


fotoopa D100 0926

fotoopa D100 0926

Display of the 3D setup 2010. Allmost functions works just now. The communication between CPLD and the 2 AVR controllers are tested. All bitstreams are transfert to the modules. Result, the LCD display show now all the information into the capture mode of the unit. The information into this mode is:

L166 : show the ambient light value
D00 : show the IR reflected light, here no object in focus so the value stay at 00
F2 : Show the numbers of samples before a fire shot. This works as a filters and can be set between 1 and 4 filter traps.
H03 : Sensivity level of the IR detector. This value is the trigger level for the difference signal between ambient light and IR reflected licht. The value can be set at 4 levels: 3, 6, 10 and 40.
S2 : slave flash steps offset now set at 2 and can be set between 0 and 4
M2 : same now but for the Master flashes on the unit, same range.
REC : show the capture mode, now the unit stay into REC mode and wait for a trigger.
V 7.60 : Voltage on the batteries. Here you now when you have to stop for low batterie level.

Other display information can be selected to adjust the flashes local and wireless. All flashes can be set between 1/512 pwr and MAX and each flash can enabled or disabled.
Backlight of the display is now on but can also set to off to lower the bat current.

The number of shots are also registered. To find the same picture pair, at start the 2 camera's counter are reset . So the same number give the same shot on both sides.

Next test are the mirros adjust procedure. Tomorrow I will adjust the hole unit and test it. On the logic analyser the camera signals are now correct at the output, The burst mode are set at 3 pictures/second if there is continue focus detection. If the detection falls, the unit can stay in burstmode if I want it so if there is again focus next few seconds the pictures are further taken. If I release the capture button, after the next infocus trigger the camera stop. If I push the STOP button, the unit goes direct into stop mode. All this functions are now fully tested on the analyser wave forms.

The logic analyser is one of my best tools. Without this tools it will take days and days to resolve your bugs. Now if there is something wrong a few seconds later you know where you have to change it. I have planned 1 week for the hole software, verilog code for the CPLD and assembler for the AVR controllers and this time is sufficient. So 15 March will be the release date as planned.

wireless light controller

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