Dear all
i read specification then DAC output from 0.25V to 2.75V
but i test in Board arduino Due with code :
int value=0;
void setup()
{
analogWriteResolution(12);
pinMode( DAC0, OUTPUT);
}
void loop()
{
analogWrite(DAC0, value );
value++;
delay(100);
if(value>4095)
value=0;
}
I measured the pin output DAC0 the voltage change from 22mv to 0.78v
i don't understand ? why?
please help me. thanks
Maybe your DAC0 is burned. Try with DAC1, and always hook a 1 or 2K resistor in serie to each DAC.
I try ADC1 also output from 22mv to 0.7v
when analogWrite(DAC0, 0); // voltage = 22 mv
analogWrite(DAC0, 4095); // voltage = 0.7v
I can still control the ADC in this voltage range --> it still work ?
Is it because I measured the voltage directly from the DAC pin, causing damage ?
Don't confuse DAC and ADC controller ...
analogWrite(DAC0, 4000) as well as analogWrite(DAC1, 4000) should be close to 2.7 V, if they are close to 0 V your 2 DACs are burned.
Google for: Arduino DUE + DAC MCP4922
i want write "I try DAC1 also output from 22mv to 0.7v"
Such a broken module is DAC
But I still do not understand why it still changes from 22mV to 0.7V when I control?
int value=0;
void setup()
{
analogWriteResolution(12);
pinMode( DAC0, OUTPUT);
}
void loop()
{
analogWrite(DAC0, 0 ); // = 22 mV
delay(2000);
analogWrite(DAC0, 2000 ); // = 395 mV
delay(2000);
analogWrite(DAC0, 4095 ); // v = 750 mV
delay(2000);
}
i still using IC LM358 Amplifiers from 22mV ->750mV to 180mV -> 3.6V
Google for: Arduino DUE + DAC MCP4922
oh thank you support DAC MCP4922
my project is AGV ( automated guide vehicle ) in my factory
The motor for AGV is BLDC ( brushless DC ) of oriental motor
but the control BLDC by voltage input from 0v to 5V ,
so i want using 2 DAC ( DAC0, DAC1 ) in arduino Due board to the controller for driver BLDC ( using IC LM358 convert form range 0.25v->2.75V to range 0V -> 5V compatible with control BLDC)
but when test DAC of arduino Due are burned ,
if DAC of Arudino is not burned , i can using this solution ?
if add using MCP4922 so very complex
There are numerous tutorials on internet on how you can drive a BLDC motor such as this one:
BLDC Motor Control With Arduino, Salvaged HD Motor, and Hall Sensors: There is a lot of interest these days among hobbyists in controlling brushless DC (BLDC) motors, which have improved performance and better energy efficiency over traditional DC...
And NO, DACs are not designed to drive BLDC motors...
hi ard_newbie
i was buy BLDC in link :
Driver have Speed Control by DC Voltage 0 -> 5V
i will try use DAC0,1 control this driver ( LM358 convert range from 0 to 5Vdc )
i will test now, then inform to you the results
thank you
hi ard_newbie
i was test in Due and board test , using LM358 convert range 22mv->750mV to 0.02V ->4.99V to the control BLDC
This article illustrates some typical operational amplifier applications. A non-ideal operational amplifier's equivalent circuit has a finite input impedance, a non-zero output impedance, and a finite gain. A real op-amp has a number of non-ideal features as shown in the diagram, but here a simplified schematic notation is used, many details such as device selection and power supply connections are not shown. Operational amplifiers are optimised for use with negative feedback, and this article di...
I'm not sure there is stability? When to use long term?
Your code is running like a charm on my DUE, 1/6 (560mV) - 1/2 - 5/6(2.76V), IDE 1.8.3, Due 1.6.11
Thanks MasterT support test my code.
That mean, Modul DAC in my Arudino Due is broken
Max. load for DAC's is 5 kOHm. Seems it weakest pins on all arduino board. You shouldn't scale 0.78V , if it's broken you can't rely on it, it may fail completely any moment.
OK MasterT
now , i only test modul DAC in arduino Due with panel test
after i will notice when using DAC modul is not broken
if DAC modul is not broken , what do you thing when i am convert voltage DAC from range 0.25V->2.75V to range 0 ->5V , => control voltage to driver brushless DC motor ?
Google is your friend, this article may worth to read Create a Customer Service Case · Support Portal
ard_newbie:
Google for: Arduino DUE + DAC MCP4922
Thanks you ard_newbie,
i was test MCP4922, it is good work and very easy