محرك التحكم L297...

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1.2V for a low level of the HOME output is not good. You are correct to assume that, when the RESET is activated that the device is at the home position. However, according to the data sheet the HOME output is: 'The transistor is open when this signal is active'. This means that the transistor (if I am interpreting it correctly) is -not- on, hence the pull-up resistors are pulling this output to 5V. However (yet again) you do measure 5V at other times ..... I must assume that I interpret this incorrectly and that the HOME output tranistor is on when the device is in it's home position. But still, the incorrect 1.2V. I can only think of the other circuitry connected to the HOME output which 'generates' this behaviour. Try checking the home output with -only- the pull-up resistor, and then, when the output is still that high, you might assume something is wrong (with the device maybe).

General note: An improper power supply (noisy, underpowered, ..) can generate strange effects (eg a device can reset itself again and again).

 

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thank you Marcel Majoor...

مرة أخرى

<img src="http://www.edaboard.com/images/smiles/icon_razz.gif" alt="إشجب" border="0" />

everythings working now.... u know wad happen, the ST L298N is defect, i change n everythings work fine.

how i find out?.... i plug out 2 wires(same phase) out of the circutis ni find out the motor still moving, but when i plug another 2 wires out, the motor isn't run anymore...

i check chip by chip n finally found the L298N is broken...it is murphy's law...the last chip i check is faulty, y it is not the first chip?...

actually wad is the rate failure of an IC, i heard tht ST quality is bad..true? like the dual diode half bridge L6210 IC... i check the diode action using multimeter, every chips i bought is different, but it is working...

then i check short circuits on the L298N some pins shows short circuits characteristic on one chip but not if i try another chip

wad i feel weird is tht the motor can run wth single phase...but torque is low i suppose..

wad u interpret is correct, when in home state the transistor is open circuits...so the home is high... tht day i read 1.1 to 1.2V is when transition, it is flunctuating so the averange is tht value i suppose

i can read the step D... n another prob is my controller code is handicap as well... there is some errors on coding....now settle.

many many many thanks... my warmest regards, س