hi all, i have 2 uno boards and same thing happens with them. i use bobcnc's software and can connect to unos but when i try adding the cnc shield on either uno it tells me there is no firmware and cannot connect
the power supply is 24v just a normal uno and red board cnc shield with purple modules which are drv8825 (4) x,x(a),y,z
any suggestions
do it connect without shield?
hi, yes uno connected to computer via usb. cnc programs connect to uno without cnc shield. so im thinking shield is dead
show photo of your shield, from near
RX/TX are free, pins 0/1 too,... strange
try pull every wire and driver from shield
actually cnc shield contain no single active element, even passive are only 1 resistor and 1 diode, so theoretically nothing able to prevent connection
In pic1 the EN/GND pins are shorted and in pic2 not.
I'd try disconnecting all the wires and drivers, making sure the shield doesn't short against the Arduino, and see if it connects. and if it does, add things one by one and see where the problem re-occurs.
yes i was trying to see if i put the jumper on if that makes any different but it doesn't.
already have tried taking everything off to see if it makes a different but still doesnt. the main wires are power, stepper motor at drv8825, e-stop and 2 limit switches, when taken off no difference. thinking of purchasing a new cnc shield board to see if that makes a difference
. thanks for help
actually cnc shield contain no single active element, even passive are only 1 resistor and 1 diode, so theoretically nothing able to prevent connection
Is this a solder blob:
Do all the solder connections look excellent?
so it connects actually, but not want working with this particular FW
yes without the shield
standard grbl-master file in arduino ide, flashed no problems onto uno. grblUpload
ah, it was atempt to detect, not real connection, ok. but how! you have Digital MultiMeter, check if RX/TX (on cnc pcb) are shorted together or to VCC or GND
sorry dmm?
tested 2 unos to see what results are. both the same. tested the shield and same, no short. then put shield onto uno, guess what, no short so i am stumpt, i can almost feel my hair turning grey lol
do you mean neither RX nor TX on cnc shield shows no connection to any other pin on underside? and despite this, the problem is still there? if yes, take bunch of dupont wires and start adding one by one(connect GND first, then RX/TX) and watch when connection will disappear
