Anthias
Newbie level 6
Hello
I'm working on a data logger to monitor an ham tv relay on a mountain.
System is working on 24 V batteries with a diesel group running one time by day between failures. We are secondary users and time of charge is not regulated by our need of energy but by the need of the first user, the owner of the group, paying fuel and repairs.
The problem is that often our battery fails to dangerous low value…
I log, battery voltage, current, charge and discharge, temperature, every minute, with a 80c552 board on a 32k*8 static ram ( HM 62256 dallas clock).
My problem is to show the collection of curves (like paper recorder) with a good quality on PAL video signal, about 400*256* 8 colors.
I can't found a SIMPLE way to do it.
I have an (original ?) idea but I think it can do be better.
My idea is to use an Eprom pattern generator, a very simple and classic design, a PIC driving a MC13777 or CXA1645F and an eprom with pictures of patterns.
Pal video signal is very good with original design of a static colour pattern.
The idea is to replace EPROM by a static ram working like an emulator driven by data logger and acquisition board.
For data bus, no need to switch :
"pattern generator board" read only the false Eprom
"data logger board" write only in the ram.
Il is only necessary to switch address bus. A black picture during some frames, when data logger is writing to ram is not a problem, each page is displayed 5 or 10 seconds.
Did you have a better idea ?
Thanks in advance.
I'm working on a data logger to monitor an ham tv relay on a mountain.
System is working on 24 V batteries with a diesel group running one time by day between failures. We are secondary users and time of charge is not regulated by our need of energy but by the need of the first user, the owner of the group, paying fuel and repairs.
The problem is that often our battery fails to dangerous low value…
I log, battery voltage, current, charge and discharge, temperature, every minute, with a 80c552 board on a 32k*8 static ram ( HM 62256 dallas clock).
My problem is to show the collection of curves (like paper recorder) with a good quality on PAL video signal, about 400*256* 8 colors.
I can't found a SIMPLE way to do it.
I have an (original ?) idea but I think it can do be better.
My idea is to use an Eprom pattern generator, a very simple and classic design, a PIC driving a MC13777 or CXA1645F and an eprom with pictures of patterns.
Pal video signal is very good with original design of a static colour pattern.
The idea is to replace EPROM by a static ram working like an emulator driven by data logger and acquisition board.
For data bus, no need to switch :
"pattern generator board" read only the false Eprom
"data logger board" write only in the ram.
Il is only necessary to switch address bus. A black picture during some frames, when data logger is writing to ram is not a problem, each page is displayed 5 or 10 seconds.
Did you have a better idea ?
Thanks in advance.
