Post Created date
Question: short-circuit protection for i/o ports?
what protects the buffer chip?
Friday, 7 November 2008 - 23:50
Question: short-circuit protection for i/o ports?
totally. a fuse/polyfuse is the only real long term solution for this kind of protection
Friday, 7 November 2008 - 05:32
Access to ISR variables
I like it, I like it alot. I see also that Cliff's method could be used in your original suggestion but I do like the use of the structure. Am I right in assuming that the...
Friday, 7 November 2008 - 03:34
Question: short-circuit protection for i/o ports?
a tansorb (tranzorb) is a protection device that shunts excess current and protects against overvoltage conditions. I wasn't aware that they themselves needed some sort of...
Friday, 7 November 2008 - 03:07
Question: short-circuit protection for i/o ports?
sorry, misunderstood your post. If you have a device that is driving one of your port pins then use a correctly rated transorb.
Friday, 7 November 2008 - 02:46
Question: short-circuit protection for i/o ports?
40mA is quite alot of current. Most devices that you'll drive will require much less, typically in the range of nA or uA. The internal pull-up resistors are usually around 50kOhm...
Friday, 7 November 2008 - 02:42
Determining Correct Value of Potentiometer?
the same equations can be used in MATLAB (or VB). I rsik being redundant and go through it step by step... From my understanding of your code you are representing your value...
Friday, 7 November 2008 - 01:02
Access to ISR variables
all valuable information fellas. And a nice piece of comic relief from MR Ekdahl. I'm implementing all the good stuff that you guys are suggesting and my interrupts are working...
Friday, 7 November 2008 - 00:18
Access to ISR variables
I did ask the same question in two posts today. I asked it in Kartman's tute because I thought it was relevant there and if answered there added more clarification to the subject...
Thursday, 6 November 2008 - 12:28
Access to ISR variables
thanks Lars thats fixed it. I should have paid attention earlier. Cheers mate.
Thursday, 6 November 2008 - 10:16
Access to ISR variables
Another problem that I'm having with my ISR is that the compiler (imagecraft) isn't producing the reti command for me. it produces a ret, but as we know that isn't the correct way...
Thursday, 6 November 2008 - 07:05
Access to ISR variables
as for the hex its just a hangover from an assembler background. Just trying to be as explicit as possible to be sure that the compiler was doing exactly as I wanted. I usually...
Thursday, 6 November 2008 - 06:45