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Topic: Is there any module/technique available to vary the output voltage with arduino (Read 689 times) previous topic - next topic

roopsai

i need to produce analog voltage which varies from 3-15 v form my ardunio am using ATMega 328 controller , but in my board there is only 5 /3.3 V available how can i vary , please help me with this situation. Is there any module which could be interfaced to get my required analog voltage ?

Grumpy_Mike

No you have to build one.
You also need a power supply equal to or greater than the largest voltage you want.
You use a transistor to switch the gap higher voltage with the own output then you need capacitors to smooth that voltage back to DC.

CrossRoads

Part like this, with an op-amp added for voltage output. Parallel input interface, so add shift register(s) to input if don't want to tie up 10 output pins.
http://www.digikey.com/product-detail/en/AD7533JNZ/AD7533JNZ-ND/819883
See Figure 11 on page 8
http://www.analog.com/static/imported-files/data_sheets/AD7533.pdf
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

MarkT

As well as the voltage range issue you need to know what current the load needs - an
opamp won't be able to source or sink much current unless its buffered with a high current
driver
[ I DO NOT respond to personal messages, I WILL delete them unread, use the forum please ]

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