A tft addin for pbp3

[richard]

hi barry


the address dup messages come from having coff file generation turned on when using dt_ints , don't know why ,wish it wouldn't
see the attached screen shot to remedy that

the syntax error i think comes from not using the latest tft-spi.pbpmod file

I have uploaded the latest just incase I stuffed up

[richard]

I did stuff up , seems I forgot to upload the latest version with fillcircle command in it .
apologies to all,

[Aussie Barry]

Thanks Richard - that did the trick!
Everything compiles and programs.
Now to breadboard it and make it work

Cheers
Barry
VK2XBP

[Aussie Barry]

Hi Richard,

I have had a small amount of success getting this thing going but still having a few problems.
Firstly, your .pdf circuit diagram appears to have another mistake (apart from the MCLR issue)
You show the LED connection on J2 as being Pin 9 however I believe it should be Pin 8 - or at least that's what is printed on the PCB silkscreen.
I made the necessary adjustments but still nothing. I am getting a nice 50% duty cycle PWM signal (~7.8kHz) on CCP1.
In frustration I connected the LED connection (J2 Pin 8) to the wiper of a 10k pot and adjusted it between 0V and 3.3V.
Once I got to around 3V the screen came to life - or at least half of it did
I think I might have a dodgy TFT screen.
I can see the elapsed timer counting and some of the reset button but most of the right side of the screen is scrambled with a big black ovoid shape in the middle.

Looks like I need to do another eBay purchase but don't really want to have to wait 3-4 weeks for it to arrive!

Thanks for all your help thus far. I will be in touch again once I have a new screen to play with.

Cheers
Barry
VK2XBP

[richard]

your right about the schematic I have uploaded a correct version , I have replaced the transistor with a pch mosfet (saves two resistors) but it still loses a little brightness and is no better than the transistor version

most of the right side of the screen is scrambled with a big black ovoid shape in the middle.

I had similar issues with mine , turns out the sil connector was very poorly soldered a bit of rework fixed it

[Gusse]

your right about the schematic I have uploaded a correct version , I have replaced the transistor with a pch mosfet (saves two resistors) but it still loses a little brightness and is no better than the transistor version

Thanks for the schematic update. Now I have to start gathering all needed components.
Why you have selected BS250, which has quite huge Rds(on), it is round 10 Ohm or more @3.3V. Why not go with a good PFET like IRLML9301TRPbF, which has ~100-200mOhm Rds(on) @3.3V. Also price is half of the BS250. With this FET you will not burn energy in transistor -> LED will be brighter.

[visnja30]

I tried to test the repetitively button, it works but not as expected.

When I touch the button the counter starts counting, and its value increases every 300ms for one and then suddenly accelerate and in few mS in increase his value very quikly and then slow down.

If it happens to someone else or just me?