We can't both have made the same assembly mistake, so it must be an "undocumented feature" Well it's documented now. Loving it.el10t wrote:Phew! I thought that was just me! I thought I had duffed it up somewhere - glad to see you get the same effect.
All four grub screws are there, but the leftmost one is a bit deeper set than the others.el10t wrote:(Alex - looks like you've lost one of your motor connector grub screws)
Thanks. Will have a play with that.Tandy wrote:Haven't had time to look at it in any detail but I think the reason is probably because the Gertboard has no pull-up/down resistors on it so the inputs to the buffers are floating. Try either setting those IOs low or turning on the pull down resistors on the Pi and I suspect it will not happen.
It is mentioned in the manual.so it must be an "undocumented feature"
Oops sorry.Gert van Loo wrote:It is mentioned in the manual.so it must be an "undocumented feature"
I probably wouldn't have understood what a pull up resistor was, to be honest. I'm still grinning that this board works at all after I put it together. I'm about half way through the tests and it's all OK so far.Gert van Loo wrote:I was hesitating adding pull ups to the Gertboard as that would mean even more parts to solder.
Also there as no easy place to put the pull-up resistors unless I made them SMD and I tried to keep the number of SMD parts to a minimum.
So in the end... no pull-ups.