Hi all, I have a couple of old 28Xs (16F873) that I cannot download a program to, or check the firmware of. Any other chip is fine - 08M, 18X, 28X1, etc. But not these 2 28Xs I've had sitting in the box for a while. I can program an 18X, fine, then try the 28X, no response, 18X again, fine.
I've tried different USB ports. Rebooting the PC. Checked all pin voltages. Did the little LED test to check the serial etc (on the software Options tab). No luck.
I've tried on 3 AA batteries, different resonators, even on the AXE022 board - they simply refuse to program. I've tried voltages from 4.5 to 5.1V.
Has anyone else had trouble with these - maybe they were part of a faulty batch? I've bought tons of PICAXEs before - only these 2 have given me any trouble. I've even tried uninstalling v531 of the software and upgrading to v532. No luck.
I need one desperately for the project I'm making (son's wireless cricket board) so if this has been a problem in the past, I'll need to urgently (and nicely) ask the PICAXE folks to perhaps send me a couple. If not, I'll return to pulling my hair out.
Any ideas, anyone?
I've tried different USB ports. Rebooting the PC. Checked all pin voltages. Did the little LED test to check the serial etc (on the software Options tab). No luck.
I've tried on 3 AA batteries, different resonators, even on the AXE022 board - they simply refuse to program. I've tried voltages from 4.5 to 5.1V.
Has anyone else had trouble with these - maybe they were part of a faulty batch? I've bought tons of PICAXEs before - only these 2 have given me any trouble. I've even tried uninstalling v531 of the software and upgrading to v532. No luck.
I need one desperately for the project I'm making (son's wireless cricket board) so if this has been a problem in the past, I'll need to urgently (and nicely) ask the PICAXE folks to perhaps send me a couple. If not, I'll return to pulling my hair out.
Any ideas, anyone?