I am building some of the boards, and wondering if i can replace D3 with 1.3w 4.7v zener rather than the 1w on the schematic. I would have ton of the 1.3w diodes on shelf, so would prefer to use them if possible. Deliveries from china take ages here.
Lähetetty iPadista
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
yes. but you will need to recalcuate the voltage in at the pin to ensure power on will work
in the .ino file
voidupdatestepperpowerdetect(){#ifdef STEPPERPWRDETECTstepperpower=(analogRead(STEPPERDETECTPIN))>600?1:0;// for ULN2003 powered from 9V with 4.7VZ, reading was 3.72V = 763// for drv8825 powered from 12V with 4.7VZ, reading was 4.07V = 834// Each digit = .00488millivolts#elsestepperpower=1;#endif // #ifdef STEPPERPWRDETECT}
make sure that the value 600 is less that what the voltage on the pin that you measured - see how i made it lower just in case there was a fluctation in the power supply to the driver board
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Excellent, so build the board, feed in the 12v, measure the voltage at the detect pin, divide by .00488 and make sure that the value in .ino is good bit lower than result? Thank you, straightforward enough.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi there
I am building some of the boards, and wondering if i can replace D3 with 1.3w 4.7v zener rather than the 1w on the schematic. I would have ton of the 1.3w diodes on shelf, so would prefer to use them if possible. Deliveries from china take ages here.
Lähetetty iPadista
yes. but you will need to recalcuate the voltage in at the pin to ensure power on will work
in the .ino file
make sure that the value 600 is less that what the voltage on the pin that you measured - see how i made it lower just in case there was a fluctation in the power supply to the driver board
Excellent, so build the board, feed in the 12v, measure the voltage at the detect pin, divide by .00488 and make sure that the value in .ino is good bit lower than result? Thank you, straightforward enough.