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ESPlay Micro

ESPlay Micro is an ESP32 Based emulator device for playing retro games, able to play classic games NES, GB, GBC, SMS, Game Gear and more.

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Everyone loves ESP32 chip, it's wonderfull chip from espressif with great functionality and really mature in software development side. This project most inspired by Odroid Go and Pocketsprite, so why making new one despite buy one of them? Well, i know those devices are great and have well community support, but some of them had some issue that i don't really like. Odroid Go had shared it's spi for both display and sdcard, and they need patched esp-idf version for it and sdcard not work very well in spi mode, at least for my experience. Then pocketsprite only have esp32 wroom module without psram and also without sdcard support so limited portability for save my collection of games.

Then i decided to design my own hardware based on both of them so i could port it's software to my own designed hardware then here i presented to you ESPlay Micro.

The board are designed for the following feature :

  • ESP32 WROVER, Dual core processor with Integrated 4MB Flash + 4MB PSRAM
  • Integrated WIFI and Bluetooth 4 BLE
  • 2,4" ILI9341 TFT Panel
  • More button (expanded via PCF8574 I2C GPIO)
  • Micro SD slot connected to SDMMC Host in 1 Line Mode for save GPIO pin
  • Integrated I2S DAC via UDA1334A
  • Integrated USB to Serial for programming and debugging using CH340C
  • Built-in TP4056 Li-Po charger
  • I2C port for expandable function
  • 3,5mm Headphone jack
  • Smaller Size, PCB only 100 x 50 mm.

And planned ability to run LVGL UI both of C and Micropython ( lv_micropython)

Standard Tesselated Geometry - 163.75 kB - 11/28/2019 at 06:12

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x-zip-compressed - 2.95 MB - 11/28/2019 at 03:35

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Standard Tesselated Geometry - 97.15 kB - 11/28/2019 at 03:35

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Standard Tesselated Geometry - 86.41 kB - 11/28/2019 at 03:35

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Standard Tesselated Geometry - 7.46 MB - 11/25/2019 at 05:27

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  • Case Design Update!

    Fuji Pebri11/28/2019 at 03:40 0 comments

    I have updated the files for 3D Printing case. This time you only need to print 4 stl files.

    • btn_assy_1.stl
    • btn_assy_2.stl
    • top_body.stl
    • bottom_body.stl

    All files can be download on files section.

  • Case Design Experiment!

    Fuji Pebri11/25/2019 at 05:24 0 comments

    After releasing the project on the Makerfabs, some people looking for the case and then i decided to make an experiment how this case should be design.

    After some iteration and made a bunch of failed 3D printed case ( I designed it with OpenSCAD), I decided to use FreeCAD which will be easier. when using OpenSCAD i need to measure the board precisely, but since i have an png and 3d model of the board, using FreeCAD should be precisely without measuring the real board.

    Here some prototype of the case, this won't be the final version but i will update the stl file, so someone should not try the old stl files which will be trashed cause it's useless agains the latest board revision


    If you want to try print yourself, print the following files
    - bottom.stl
    - bottom_layer_stl
    - button_assy_1.stl
    - button_assy_2.stl
    - top_body.stl

    All files including the source FreeCAD files can be found on files section. Please give me feedback if you modify those file so i could update the file.

  • ESPlay Micro MP3

    Makerfabs11/21/2019 at 10:43 0 comments

  • ESPlay Micro Loves LittleVGL and Micropython

    Fuji Pebri10/28/2019 at 06:50 0 comments

    Hi Hackaday,

    Today i introduces you some ability what esplay micro can do. I port micropython with lvgl module built-in from littlevgl repository here. Picture will explain everything.

    the code for screenshot above

    import lvgl as lv
    lv.init()
    
    import lvesp32
    import ILI9341 as ili
    d = ili.display()
    d.init()
    disp_buf1 = lv.disp_buf_t()
    buf1_1 = bytes(320*10)
    lv.disp_buf_init(disp_buf1,buf1_1, None, len(buf1_1)//4)
    disp_drv = lv.disp_drv_t()
    lv.disp_drv_init(disp_drv)
    disp_drv.buffer = disp_buf1
    disp_drv.flush_cb = d.flush
    disp_drv.hor_res = 320
    disp_drv.ver_res = 240
    lv.disp_drv_register(disp_drv)
    
    # Animation helper class
    
    class Anim(lv.anim_t):
        def __init__(self, obj, val, size, exec_cb, path_cb, time=500, playback = False, ready_cb=None):
            super().__init__()
            lv.anim_init(self)
            lv.anim_set_time(self, time, 0)
            lv.anim_set_values(self, val, val+size)
            if callable(exec_cb):
                lv.anim_set_custom_exec_cb(self, exec_cb)
            else:
                lv.anim_set_exec_cb(self, obj, exec_cb)
            lv.anim_set_path_cb(self, path_cb )
            if playback: lv.anim_set_playback(self, 0)
            if ready_cb: lv.anim_set_ready_cb(self, ready_cb)
            lv.anim_create(self)
    
    # An animated chart
    
    class AnimatedChart(lv.chart):
        def __init__(self, parent, val, size):
            super().__init__(parent)
            self.val = val
            self.size = size
            self.max = 2000
            self.min = 500
            self.factor = 100
            self.anim_phase1()
    
        def anim_phase1(self):
            Anim(
                self,
                self.val,
                self.size,
                lambda a, val: self.set_range(0, val),
                lv.anim_path_ease_in,
                ready_cb=lambda a:self.anim_phase2(),
                time=(self.max * self.factor) // 100)
    
        def anim_phase2(self):
            Anim(
                self,
                self.val+self.size,
                -self.size,
                lambda a, val: self.set_range(0, val),
                lv.anim_path_ease_out,
                ready_cb=lambda a:self.anim_phase1(),
                time=(self.min * self.factor) // 100)
    
    # Create the chart
    
    scr = lv.obj()
    chart = AnimatedChart(scr, 100, 1000)
    chart.set_width(scr.get_width() - 100)
    chart.align(scr, lv.ALIGN.CENTER, 0, 0)
    series1 = chart.add_series(lv.color_hex(0xFF0000))
    chart.set_type(chart.TYPE.POINT | chart.TYPE.LINE)
    chart.set_series_width(3)
    chart.set_range(0,100)
    chart.init_points(series1, 10)
    chart.set_points(series1, [76,40,40,40,50,40,50,90,95,90])
    chart.set_x_tick_texts('a\nb\nc\nd\ne', 2, lv.chart.AXIS.DRAW_LAST_TICK)
    chart.set_x_tick_length(10, 5)
    chart.set_y_tick_texts('1\n2\n3\n4\n5', 2, lv.chart.AXIS.DRAW_LAST_TICK)
    chart.set_y_tick_length(10, 5)
    chart.set_div_line_count(3, 3)
    chart.set_margin(30)
    
    # Create a slider that controls the chart animation speed
    
    def on_slider_changed(self, obj=None, event=-1):
        chart.factor = slider.get_value()
    
    slider = lv.slider(scr)
    slider.align(chart, lv.ALIGN.OUT_RIGHT_TOP, 10, 0)
    slider.set_width(30)
    slider.set_height(chart.get_height())
    slider.set_range(10, 200)
    slider.set_value(chart.factor, 0)
    slider.set_event_cb(on_slider_changed)
    
    # Load the screen
    
    lv.scr_load(scr)

  • Trial Producton

    Makerfabs10/17/2019 at 01:59 0 comments

    A small trial production started, and preorder at:https://www.makerfabs.com/esplay-micro.html

    the first batch shipping time woudl be estimated 28th, Oct. 

    We prepared a SD card with some simple game installed, so buyer can start playing with the USB cable connected for power.

  • Start to Play

    Makerfabs10/11/2019 at 06:59 0 comments

    with the new firmware, it works much better.

  • Rev2.0 Test Firmware and Sound!

    Fuji Pebri10/01/2019 at 15:27 0 comments

    @Makerfabs sent me 2 PCBA Sample last week, so i could work for the firmware this weekend. After upload the fw i just surprise the sound and button didn't works, i spent two hours to see what happened. I didn't make any changes on button, then after reads the datasheet there's different i2c address scheme between PCF8574AT and PCF8574T. Earlier prototype PCF8574AT was used ( salvaged from 1602 lcd i2c backpack ) and the address 0x38 was used, with this sample PCF8574T the address is 0x20, one problem solved.

    The Sound is different case, after 3 hours struggled with the programming the problem is not the software but really bad typos on schematics, the resistor for R-C filter was wrongly typed from 1 Ohm to 1 KOhm, swap the resistor with the right one and VOILA the sound works. The Sound output are really clean on the headphone and very low noise output from the speaker, really satisfied with the result. 

  • Rev2.0 PCBA Sample Completed

    Makerfabs09/18/2019 at 05:50 4 comments

    The Rev2.0 sample PCBA completed

  • Revision Time!

    Fuji Pebri08/29/2019 at 01:29 0 comments

    So... Yesterday I finished a revision design for next PCB. I will double check it before sending it to manufacturer. This time the prototype PCB will be produce by @Makerfabs.

    Here the changes in this revision so far, i called this pcb-rev2.0 :

    • Audio amplifier chip would be replaced by PAM8403 and used only left channel since audio onboard speaker only mono. I used this chip because the that have inbuilt shutdown circuit and low noise audio profile.
    • Change layout audio blocks, so audio system will be in one block to reduce noise.
    • TP4056 li-ion charger replaced by LTC4054 since it smaller and less external components.
    • Add usb plug detect and charger status, it will be monitored by esp32 to charge management.
    • Add some ESD Protection on sdcard.
    • Moved all port to the bottom edge pcb so it won't interfere while play.

  • New Launcher UI!

    Fuji Pebri08/06/2019 at 06:09 0 comments

    Hi, a bit software updates!

    Long ago i used a quick and dirty hack of GoGo launcher made by odroid-go community member. Now i built from scratch an Launcher Software for Esplay Micro using UGUI library and add some capabilities like uploading file to device using web browser. checkout my github page for code.

    While built this launcher i found a little bit flaw on hardware side, seems the LDO not enough current to supply whole board while wifi enable, backlight TFT are glitching and sometimes esp32 reboot cause of brownout detected, decreasing WiFi TX power seems solve for now, default TX power is 20 dBm and decreasing half of it to 10 dBm uses less power.

    Here some spoiler about it

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Discussions

knopserl wrote 03/15/2020 at 14:04 point

The 3D case model is perfect (I printed it on my Prusa Mini), however  I did not find any screew to tighten the the top case part. I used 2,5mm screews with 20mm length which fit throu the wholes but they dont hold down the top case as the scree holes are to lage. But 3mm screews dont fit in the lower part and the PCB. So I wonder which screews the author is using and where to get them.

  Are you sure? yes | no

fabian wrote 08/27/2019 at 18:43 point

Add sound music player, many people loves radio wifi

  Are you sure? yes | no

Fuji Pebri wrote 08/28/2019 at 00:41 point

Hi, actually it's already on planned list, that's why i added i2s DAC for high quality sound. And the good news is it work in progress, we need a new pcb revision cause the current pcb has bugs with sound design.

  Are you sure? yes | no

Eugene Andruszczenko wrote 08/23/2019 at 18:19 point

@Fuji Pebri has been amazing in his help with rewritting a better launcher with a nicer UI. check out our joint effort on this https://github.com/retro-esp32/RetroESP32

Releases are here https://github.com/retro-esp32/RetroESP32/releases

It includes 11, YES eleven emulators.

 Nintendo Entertainment System
 Nintendo Game Boy
 Nintendo Game Boy Color
 Sega Master System
 Sega Game Gear
 Colecovision
 Sinclair Zx Spectrum 48k
 Atari 2600
 Atari 7800
 Atari Lynx
 PC Engine

  Are you sure? yes | no

Fuji Pebri wrote 08/24/2019 at 04:47 point

Thanks @Eugene Andruszczenko for sending me your Retro ESP32 board, the board are awesome, still wait my GBP case arrive. Btw your retro esp32 has clean sound while esplay micro a lot of noise on low volume on speaker. i2s output has great sound although, i was design audio part carelessly, i will take yours as reference for next revision.

  Are you sure? yes | no

knopserl wrote 03/15/2020 at 14:01 point

does this RetroESP32 fit to the ESPlay HW (buttons, DAC etc.)?

  Are you sure? yes | no

Calebe94 wrote 08/23/2019 at 12:06 point

Good work man.
When I finish my bachelor's degree I will update my project again, and I will definitely use your project as a reference.

  Are you sure? yes | no

Fuji Pebri wrote 08/24/2019 at 14:09 point

Thanks bro, you must update your projects, it was the most inspiration of this projects.

  Are you sure? yes | no

Jonatas wrote 08/06/2019 at 16:01 point

amazing project! could provide a circuit diagram in PDF

  Are you sure? yes | no

Fuji Pebri wrote 08/06/2019 at 16:35 point

Currently the circuit diagram is available in eagle format in my github repository. I'll add pdf format in next commit. Thanks.

  Are you sure? yes | no

Le Roux Bodenstein wrote 08/03/2019 at 17:04 point

Where did you buy the LCD screen? And how do you attach the flex cable to the pcb?

  Are you sure? yes | no

Fuji Pebri wrote 08/05/2019 at 05:40 point

I bought from aliexpress.com, search for 2.4" tft screen ili9341. Normally you need flex cable connector, but for this one i designed just soldered directly to the PCB.

  Are you sure? yes | no

deʃhipu wrote 08/01/2019 at 10:31 point

I don't know why I only saw it now. Very nice project! I can see why you printed a case with button caps — those metal buttons are the worst.

  Are you sure? yes | no

Fuji Pebri wrote 08/01/2019 at 14:36 point

Thanks, yes the buttons are hard to press, later i'll change it with the silicon type. Earlier prototype using the same button with your uGame, those button are really good, but it's easily broken. My son could break it in just 2 months.

  Are you sure? yes | no

Brendan Robert wrote 07/31/2019 at 17:08 point

Cool project!  FWIW, I have a major bug-fixed version of the Nofrendo port which might help; it has SRAM save support (Hello, Zelda!) and SD support also.  It's dangerous to go alone, take this: https://github.com/badvision/esp32_nesemu 

  Are you sure? yes | no

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