Re: suggestions for a graphics display
开云体育In my opinion, deciding which display to use for a project is one of the hardest decisions to make.? It turns out to be the answer to a large optimization problem where the variables are complex functions of each other.? You have some of the variables in your list but you forget some of the most important.? You’ve forgotten “display ability”… does the display have the innate hardware to draw a circle, or do you need an outboard processor and 500 lines of code to generate that circle.? This is important for two reasons… it speaks to development cost and overall hardware costs for the display, …and it also speaks to the maintainability of the display if you expect the average ham to tinker with the code after it’s released.? I’ve played with those E-ink displays and they are beautiful… if you are making clocks… but virtually useless for ham projects.? If you think I’m exaggerating, try using one as the display for a watt meter.? Then cast all of the variables in terms of a dollar figure for tradeoff.? Yikes.? I personally will pay a lot extra for a nice display that is fast and easy to program and use… but that’s just me. ? I suspect there are guys here that have to select displays commercially for projects.? Let’s see what they have to say. ? MRM ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Ashhar Farhan ? peeps, ? i am thinking of a graphics display for the bitx radios. here is the shopping list of ideas: 1, Ubiquitous : We should be able to source it from multiple sources and multiple countries with ease. 2. Low cost: The bitx40 costs 50 dollars to make. We can't tie it to a display alone that costs $20s. 3. RF friendly: Many of these display are very noisy. 4. Current consumption. We should be able to handle this with a few milliamps. ? I have tried two options : A) 128x64 LCD display. The common one uses the KS0108 display that needs about 11 pins. Which means, we will have to dedicate one ATMEGA328P as a 'display controller' that runs over a TTL serial line. That way, a single TTL line can be used to control the display. I have, at the moment, a display of this sort running where you can give send text message like "text 20,30, Hello world" or "rect 10,10,100,50". It seems to be a reasonable solution. It can even display the waterfall. The current consumotion is about 10 ma without the backlight. A 2N7000 turns the backlight on and off. B) E-ink display. I have used modules from waveshare. The display is to die for. It does everything, costs a little more, however, alas, the display update time is lagging. You turn the knob and wait for the frequency to update. I haven't given up on it yet, I hope there is some breakthrough and we can get the frequency updated in real-time. If the frequency can be updated, then even the S meter would work.? ? Any further ideas? ? - f -- …_. _._ |
MadRadioModder