I have been working on a GPS based digital clock and have come across a strange (and frustrating) problem
It was all working great until I tried to fix one of the individual segments that wasn't working. it was a simple small fault with the homemade PCB and i fixed it.
however when i tried to...
In my program i am using an interrupt to trigger if a button is pressed.
here is a block diagram of the program:
my problem is that the manual says an interrupt procedure must always be finished with a "return" command but i want to always go to the "calculate+display" procedure, no matter...
i am thinking about making a gps based digital clock so it is highly accurate and need to know how long it would take a fast picaxe (20x2 or 18M2) to process a NMEA serial data stream. (9600bps) (im hoping it is less than a few mS)
i am wondering if it is possible to get a picaxe to extract the time and date information from a NMEA serial data stream from a gps module.
the GGA - (Global Positioning System Fix Data) message is the one with all the info im interested in.
see page 7 of...
i am making a 433MHz data receiver and want it to drive groups if four leds in relation to the data it has received. Because it will be waiting for serial data most of the time i cant use multiplexing. if i use a 18M2 i can drive 3 groups of 4 leds (already using some pins)
but my question is...
I'm making a remote tank level meter with a 14M and am using the 5 ADC inputs already (4 for the levels and 1 for battery voltage sense)
I'm trying to get it to wake up every 10-20 min and take a reading and send it to the wireless module and need to know how to generate this long a delay...