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ideas needed, on how to generate this

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henny

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im looking for pointers on how to gererate the attached control siginal.

im thinking of going down the pic route but what to drive with the pic to get the desiered siginal

the control siginal is "Furse FMX" this is a muiltiplexed analoug control siginal for the control of furse lighting dimmers

the end plan is to make a converter that takes DMX512 and converts to FMX

any ieas would be great ,

cheers

henny
 

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A brief look at the circuit reveals that two analogue voltages are needed. They are fixed +12V & 0-10V. The shortest timing is only 70us which is very comfortable for a PIC to work on. You can't generate the voltages using PIC alone but you can generate any voltage between 0-5V using a PIC with ease.

Then all you'll need is a voltage amplifier of gain 2.4X to amplify it into 12V.

With the amplifier, 12V becomes +5V and the 10V control signal now ranges from 0-4.2V. If you use a R-2R DAC network connects to a 8-bit output port, then a value of 255 would give you very near +5V. For the 0-4.2V range, you have the binary value of 0-215 to play with. If you settle for 0-200, then that would translate into a resolution of 0.5% for each possible step in your final output brightness. If that doesn't do, you can always increase the resolution by using an extra bit in another output port.
 
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