Rgb panel with esp 32

DabuXD · June 12, 2019, 8:15am

few months ago i posted asking for help to daisy chained three of 32*64 panels
since then i have been studying a lot about how these panels works and how micro controllers work in general
so what is i am up to now is that, i want to run three 32x64 panels daisy chained together with only one bit color so i will be writing my own basic code but before that i need hardware to run them. I decided to copy smart led sheild but it was to complicated then i saw marcmerlin using protoboard and then using Jason’s board to connect esp32 to rgb panel. i found that interesting but i could not find any resources on its wiring or schematic
so if any one could provide me with those schematic or circuit i would be very thankful because these board can not be shipped to my country(pakistan)
in short i want to code these panel on my own but i want to use somebody’else hardware so that when i mess up i know it’s because of my code and not the hardware

Louis · June 13, 2019, 11:23pm

The pinout Marc is using is documented here:

github.com

pixelmatix/SmartMatrix/blob/teensylc/src/MatrixHardware_ESP32_V0.h#L62


      
          #define BIT_R2  (1<<3)   
          #define BIT_G2  (1<<4)   
          #define BIT_B2  (1<<5)   
          
          
// Control Signals
          #define BIT_LAT (1<<6) 
          #define BIT_OE  (1<<7)  
          
          
#define BIT_A (1<<8)    
          #define BIT_B (1<<9)    
          #define BIT_C (1<<10)   
          #define BIT_D (1<<11)   
          #define BIT_E (1<<12)   
          
          

          
#if (GPIOPINOUT == ESP32_JC_RIBBON_PINOUT)
              #pragma message "Jason Coon ESP32 NodeMCU shield wiring"
          // This pinout takes a ribbon cable and flattens it, pin order is 1, 9, 2, 10 ...
          // it connects to https://www.tindie.com/products/jasoncoon/16-output-nodemcu-esp32-wifi-ble-led-controller/
          // *** WARNING, I cut the trace on Jason's board that went to pin 3, and patched a wire
          // to pin 27 so that I can use RX/TX serial debugging ****

All you have to do is connect up those signals from the ESP32 to your panel, and it should work as long as your panel works without level shifters

You can ignore these two signals:

github.com

pixelmatix/SmartMatrix/blob/teensylc/src/MatrixHardware_ESP32_V0.h#L130


      
              #define B1_PIN  GPIO_NUM_27
              #define R2_PIN  GPIO_NUM_19
              #define G2_PIN  GPIO_NUM_18
              #define B2_PIN  GPIO_NUM_5
          
          
    #define A_PIN   GPIO_NUM_16
              #define B_PIN   GPIO_NUM_4
              #define C_PIN   GPIO_NUM_0
              #define D_PIN   GPIO_NUM_2
              #define E_PIN   GPIO_NUM_17
          
          
    #define CLK_PIN GPIO_NUM_15
              #define LAT_PIN GPIO_NUM_14
              #define OE_PIN  GPIO_NUM_12
          
          
#elif (GPIOPINOUT == ESP32_JC_RIBBON_PINOUT_WEMOS)
              #pragma message "Jason Coon ESP32 Wemos/Lolin shield wiring"
          // This pinout takes a ribbon cable and flattens it, pin order is 1, 9, 2, 10 ...
          // it connects to https://www.tindie.com/products/jasoncoon/16-output-wemos-d32-wifi-ble-led-controller/
          // *** WARNING, I cut the trace on Jason's board that went to pin 3, and patched a wire
          // to pin 27 so that I can use RX/TX serial debugging ****

Change which pinout you are selecting here:

github.com

pixelmatix/SmartMatrix/blob/teensylc/src/MatrixHardware_ESP32_V0.h#L37


      
          #define MATRIX_HARDWARE_H
          // formula used is 80000000L/(cfg->clkspeed_hz + 1), must result in >=2.  Acceptable values 26.67MHz, 20MHz, 16MHz, 13.34MHz...
          #define ESP32_I2S_CLOCK_SPEED (20000000UL)
          
          
#define ESP32_FORUM_PINOUT              0
          #define ESP32_FORUM_PINOUT_WITH_LATCH   1
          #define SMARTLED_SHIELD_V0_PINOUT       2
          #define ESP32_JC_RIBBON_PINOUT          3
          #define HUB75_ADAPTER_PINOUT            4
          #define HUB75_ADAPTER_LATCH_BREADBOARD_PINOUT            5
          #define HUB75_ADAPTER_V0_THT_PINOUT     6
          #define HUB75_ADAPTER_V0_SMT_PINOUT     7
          #define ESP32_JC_RIBBON_PINOUT_WEMOS    8
          
          
#ifndef GPIOPINOUT
          #define GPIOPINOUT ESP32_FORUM_PINOUT
          #endif
          //#define GPIOPINOUT ESP32_FORUM_PINOUT_WITH_LATCH // note this mode is untested as of 2018-05-17 - not being used anymore now that SmartMatrix Shield is available
          //#define GPIOPINOUT SMARTLED_SHIELD_V0_PINOUT
          
          
//Upper half RGB

DabuXD · June 14, 2019, 7:20am

i am not used to library-reverse engineering that why i couldn’t find it, thanks for guiding me

marcmerlin · June 15, 2019, 10:26pm

http://marc.merlins.org/perso/arduino/post_2019-04-01_SmartMatrix_-SmartMatrix-Shield-v4-for-Teensy_-ESP32-shield-with-level-shifter_-and-SmartMatrix_GFX.html#ESP32
mentions
“You’ll want to look at this file for how to wire your ESP32: SmartMatrix/MatrixHardware_ESP32_V0.h at teensylc · pixelmatix/SmartMatrix · GitHub”

So at least, I tried