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    Yet Another Pi Zero Portable!!

    Scheduled Pinned Locked Moved Projects and Themes
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    • mooseprM
      moosepr
      last edited by

      @Parzival i did some hunting, didint want the usual 'clicky' tactile switches that are commonly used. I found a guy on ebay that sells all kinds of switches for the repair of keyfobs and the like

      http://www.ebay.co.uk/itm/321411385630

      the ones i got are the OMTEN D3. They are really nice, will be great behind some actual buttons, will give that retro feel of the rubber domes

      want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

      1 Reply Last reply Reply Quote 0
      • T
        thedudester80
        last edited by

        That is a cool portable. I like the battery body idea. Must be really thin and light. Good work .

        Mint Boy, Case Arcade, New Projects Coming soon....

        1 Reply Last reply Reply Quote 0
        • mooseprM
          moosepr
          last edited by

          Yeah it's just a shade thicker than a sharpie, and only 105 grams, so it's pretty skinny

          want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

          1 Reply Last reply Reply Quote 0
          • senkunS
            senkun @moosepr
            last edited by

            @moosepr said in Yet Another Pi Zero Portable!!:

            Right!! i have a plan. I have been doing some digging and the ili9341 screens are actually all the same!! there are 2 variations, the larger have touch, and the smaller dont, the first 14 pins are the same regardless of the presence of touch. So all i need to do, is buy a naked 2.8" screen, and unsolder the 2.2" screen i currently have, and transplant the 2.8" screen on top!! that way the pcb is actually the same size, if not smaller than the screen, and there is more space to play with!!

            now to wait for the good ship chinapost :D

            hey. Just wondering how's it going with your project? Did you get the the transplant done? And, what are you using for audio? Just noticed that you have no audio out in your build.

            mooseprM 1 Reply Last reply Reply Quote 0
            • mooseprM
              moosepr @senkun
              last edited by

              @senkun

              Hey man

              Well I technically have all the bits, just need to iron out a few bits.

              My plan with transplanting a 2.8 screen onto a 2.2 board didn't work. The distance from solder connector to screen edge is the same for all screens, so it gave me no benefit. I'm just trying to knock up a little PCB that will allow me to connect the screen with minimal board.

              As for the sound, I'm planning on using an adafruit digital audio board https://www.adafruit.com/products/3006 which will give me mono sound for the speaker, or maybe even switchable to the headphones. That would then leave me with a hole where the volume knob should be.

              The problem I have now, is once I have got my PCB designed it's going to be another 2 weeks at least. Although I will end up with some spares I could distribute.

              want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

              T senkunS 2 Replies Last reply Reply Quote 0
              • T
                thedudester80 @moosepr
                last edited by

                @moosepr That I2S amp works great with the pi zero. I used it for my altoid project. Really simple to setup as well.

                Mint Boy, Case Arcade, New Projects Coming soon....

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                • Tekkaman_SladeT
                  Tekkaman_Slade
                  last edited by Tekkaman_Slade

                  @moosepr - I wish that I2S audio amp was available when I built the NeoPiGamer. I'm definitely going to use it in my next pi zero build. Great find!!! Looking forward to your completed build.

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                  • mooseprM
                    moosepr
                    last edited by

                    yeah that little amp is ideal. Shame its only mono. You can get stereo versions but they are a little larger (although looking at this, it doesnt have much 'amp' in there) https://shop.pimoroni.com/collections/pi-zero/products/phat-dac

                    The only issue i have, is the I2S board needs pin 18, which is currently what my ili9341 screen uses for its backlight

                    want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                    1 Reply Last reply Reply Quote 0
                    • senkunS
                      senkun @moosepr
                      last edited by

                      @moosepr said in Yet Another Pi Zero Portable!!:

                      The distance from solder connector to screen edge is the same for all screens, so it gave me no benefit.

                      alt text

                      http://www.aliexpress.com/item/2-8-inch-TFT-LCD-screen-display-ILI9341-40-pin-plug-in-type-support-8-16/32627803416.html

                      How bout this one?

                      mooseprM 1 Reply Last reply Reply Quote 0
                      • mooseprM
                        moosepr @senkun
                        last edited by

                        @senkun

                        That would technically work, the board I currently have is only 14 pin. It's the pure SPI interface, where as the 40 pin ones have raw pixel pins bundled.

                        I'm currently trying to design a board that has a 14 pin ribbon connector on one edge, and 8 pins of SPI on the other. Literally a bare minimum.

                        You could technically solder wires direct from the screen ribbon to the pi with nothing in the middle, but the 0 8mm pitch ffc connector doesn't lend itself to hand soldering

                        want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                        senkunS 1 Reply Last reply Reply Quote 0
                        • senkunS
                          senkun @moosepr
                          last edited by

                          @moosepr

                          I must've been blind not only did not read where it said 40-pin, didn't even see how fine the pitch is. Took one look at the length of the ribbon and thought hey we could drop this on the 2.2" controller board...

                          btw, are you using the pitft22 dt overlay to enable your screen? Can I have your tft to zer0 pinouts for reference?

                          mooseprM 1 Reply Last reply Reply Quote 0
                          • mooseprM
                            moosepr @senkun
                            last edited by

                            @senkun

                            its easy done. there are so many screens and variations of them, its a minefield!!

                            I used the information from here
                            http://marcosgildavid.blogspot.co.uk/2014/02/getting-ili9341-spi-screen-working-on.html

                            then used a little reference image to trace things

                            https://www.element14.com/community/servlet/JiveServlet/previewBody/73950-102-10-339300/pi3_gpio.png

                            I was managing to get the thing working with the command

                            sudo modprobe fbtft_device pitft22 (i think, im working from memory here)

                            then i could mirror the terminal by typing

                            con2fbmap 1 1

                            but i was struggling to get things to activate at boot. Doing a bit of googling, i managed to find a video on youtube that had the solution to my problem. The problem is now, i am unable to find the video :( I will have to ssh onto my zero and use the command history and see how i fixed it

                            want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                            1 Reply Last reply Reply Quote 0
                            • mooseprM
                              moosepr
                              last edited by

                              so now i may also be able to add PCB design to my skillset

                              https://oshpark.com/shared_projects/BP9tGKag

                              in theory you can solder a 2.2" ili9341 screen direct to that board, then add wires from there to the pi

                              the 2.4" and 2.8" screens have an extra 4 pins on the connector, but thats just for the touch, so they could just be snipped off the ribbon (hopefully)

                              The resister on there is just for the backlight, you can change it to alter the backlight brightness, and it means there is one less pin needed from the pi (so i can use pin#18 for audio)

                              its the first PCB i have designed, so it may not be perfect, and it is untested, so it could burst int flames, who knows!!

                              want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                              senkunS 1 Reply Last reply Reply Quote 0
                              • senkunS
                                senkun @moosepr
                                last edited by senkun

                                @moosepr said in Yet Another Pi Zero Portable!!:

                                sudo modprobe fbtft_device pitft22

                                Ah thanks. That's already in the latest kernels, so it can be enabled by adding to config.txt;
                                dtparam=spi=on
                                dtoverlay=pitft22

                                in theory you can solder a 2.2" ili9341 screen direct to that board, then add wires from there to the pi

                                Haha. Nice little board. But wait! We can ditch the original red pcb and just solder screen ribbon wired direct to the zer0's gpios?

                                Here is the 2.2" tft without touch screen, just the 9 pins but there's that cap and resistor plus u1, q1, j1 which is not needed?

                                edit: seems like u1 is a 65z5 +voltage regulator chip which doesn't seem to be present on the 14 pin touch versions.

                                alt text

                                mooseprM 1 Reply Last reply Reply Quote 0
                                • mooseprM
                                  moosepr @senkun
                                  last edited by

                                  @senkun yeah my board might be a little too minimal, but it's only costing me $2.20 for 3, so it's worth a punt. The only down side is the wait.

                                  If it does work, I'm planning on making a custom board that will will link it all together into one. 2.2 screen on the front, some buttons on the button in a DMG-01 layout.

                                  want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                                  senkunS 1 Reply Last reply Reply Quote 0
                                  • senkunS
                                    senkun @moosepr
                                    last edited by senkun

                                    @moosepr said in Yet Another Pi Zero Portable!!:

                                    @senkun yeah my board might be a little too minimal, but it's only costing me $2.20 for 3, so it's worth a punt. The only down side is the wait.

                                    If it does work, I'm planning on making a custom board that will will link it all together into one. 2.2 screen on the front, some buttons on the button in a DMG-01 layout.

                                    Apparently these screens will not work unless they're getting a strict 3.3V hence that 65Z5 regulator on board.

                                    I'd say you need to regulate power to it somehow. Take it from the Zer0's 3.3V? You've ordered the boards so it'd be interesting to see if and how well it tolerates fluctuating power directly off a Lipo (from 4.2V max ~ 3V safe cutoff).

                                    While the Zer0 can and has been tested to boot from as low as 2.8V (very unsafe if Lipo) and run unless there are 5v usb peripherals. But you have that charger/protector module (I think that cuts at 3.2V) and you've tested it running from just the Lipo with memory sticks and wi-fi dongle. So everything should still work if the screen is tolerant.

                                    mooseprM senkunS 2 Replies Last reply Reply Quote 0
                                    • mooseprM
                                      moosepr @senkun
                                      last edited by

                                      @senkun
                                      I am running my screen from the 3.3v line on my zero anyway, so I'm assuming everything will be OK without regulation.

                                      Your brave ordering my boards! I couldn't find a proper connector in fritzing so i had to hand build one from the normal pads. There are some things quite close together, so it will need to be tested for shorts.

                                      want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                                      senkunS 1 Reply Last reply Reply Quote 0
                                      • senkunS
                                        senkun @moosepr
                                        last edited by

                                        @moosepr

                                        hey how's it going?

                                        So I finally got hold of them Ilitek screens, one of each size! Been playing around with them, I couldn't find an existing overlay that I could just pop in (thought pitft22 would work but nope). So yeah, probably gonna compile my own dt blob, but went back to fbtft and modprobe to mess around first. Still using gpio 18 for led but gonna reassign and use that for pwm audio out.

                                        The screens are pretty zippy. with buffer throughput set to 32k, stable at 48000kHz and probably getting more than 30fps, no flicker, some slight tears only when large blocks are dumped quickly. But the viewing angles in horizontal orientation are terrible! Really bad unless looking straight on. They're all originally used for low end cellphones and designed for vertical viewing, but still good bang for the buck I guess.

                                        All three of my screens seem pretty dark though, how's the backlight levels on yours? Did you play around with different resistors for the leds?

                                        mooseprM 1 Reply Last reply Reply Quote 0
                                        • mooseprM
                                          moosepr @senkun
                                          last edited by

                                          @senkun

                                          Hey man, I'm still watching the door, waiting for a tiny parcel filled with PCB's. I did get a notification the other day that it had been despatched, so it can't be much longer now.

                                          I have noticed the tearing in fast and full screen changes, but there is nothing major. I have only used gpio 18 for the backlight, that seems to use a transistor and a few little resistors, so is pretty much 3.3v going in there. The screens don't have brilliant viewing angles yeah, but I guess you get what you pay for eh? The best in my option is oled. Viewing angles are always amazing because of the way they work, but they are hard to find and expensive.

                                          want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                                          senkunS 1 Reply Last reply Reply Quote 0
                                          • senkunS
                                            senkun @moosepr
                                            last edited by

                                            @moosepr

                                            Haha if it's from OSH all the tiny pcbs are gonna be floating loose in an envelope. I was thinking of soldering directly to the ribbon but I see now why you did the pcbs.

                                            alt text

                                            mooseprM 2 Replies Last reply Reply Quote 0
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