Display is not turning on, do i need a battery?

[dorofino]

The display is not turning. Do I need the battery connected, or can I test it with just the USB connected? I believe I connected everything correctly, but the display is still not turning on. I see the battery LED blinking on the board, so perhaps it is due to the absence of the battery. Any advice on this?

[lmarzen]

No battery needed.

Please share the serial monitor output. (go to the Serial Monitor tab at the bottom of vscode/platformio near the upload button)

[dorofino]

Here

--- Terminal on COM7 | 115200 8-N-1
--- Available filters and text transformations: colorize, debug, default, direct, esp32_exception_decoder, hexlify, log2file, nocontrol, printable, send_on_enter, time
--- More details at https://bit.ly/pio-monitor-filters
--- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H
Busy Timeout!
_Update_Full : 10000150
Busy Timeout!
_PowerOff : 10001107
Awake for 41.290s
Entering deep sleep for 1737s
ets Jul 29 2019 12:21:46

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:1184
load:0x40078000,len:13232
load:0x40080400,len:3028
entry 0x400805e4
Battery voltage: 4170mv
Connecting to 'UNBREAKABLE-NETWORK'...
IP: 192.168.1.220
Waiting for SNTP synchronization........................................
Monday, December 30, 2024 12:39:00
Attempting HTTP request: api.openweathermap.org/data/3.0/onecall?lat=30.0550818&lon=-81.5166671&lang=en&units=standard&exclude=minutely&appid={API key}
  200 OK
Attempting HTTP request: api.openweathermap.org/data/2.5/air_pollution/history?lat=30.0550818&lon=-81.5166671&start=1735493943&end=1735580342&appid={API key}
  200 OK
Reading from BME280... Success
Busy Timeout!
_PowerOn : 10001255
Busy Timeout!
_Update_Full : 10000150
Busy Timeout!
_PowerOff : 10001107
Awake for 40.217s
Entering deep sleep for 1227s

I also connected the display directly to the DESPI-C02, and I believe I have the wiring correctly matching your wiring diagram/wiring_di_despi-c02.png.

[dorofino]

Additionally, I observe voltage the DESPI-C02 for a while after bootup and after invoking the api.openweathermap.

[lmarzen]

It looks like the connector on your epaper display is not all the way plugged into the driver board? (pull the black lever up, insert the cable (shouldn't be much resistance), then push the black lever back down.).

[dorofino]

Yes, that is what I thought, but can see bite marks in the picture.

The display is a brand-new display.

[lmarzen]

I must be mistaken then. I'll take a closer look at your wiring when I get a chance.

[dorofino]

Thank you. I over the wiring a couple of times and I they are ok.

[dorofino]

I purchase this E-ink Display, perhaps this is the issue? Do you think is not compatible?

https://www.aliexpress.us/item/3256806387212613.html?spm=a2g0o.order_list.order_list_main.28.21ef18022RnFjm&gatewayAdapt=glo2usa#nav-specification

[lmarzen]

Did you select the corresponding panel in config.h?
Your wiring looks correct to me.

[dorofino]

I believed i did, I follow the instructions., but perhaps i missing something.

here is the config.h

/* Configuration option declarations for esp32-weather-epd.
 * Copyright (C) 2022-2024  Luke Marzen
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef __CONFIG_H__
#define __CONFIG_H__

#include <cstdint>
#include <Arduino.h>

// E-PAPER PANEL
// This project supports the following E-Paper panels:
//   DISP_BW_V2 - 7.5in e-Paper (v2)      800x480px  Black/White
//   DISP_3C_B  - 7.5in e-Paper (B)       800x480px  Red/Black/White
//   DISP_7C_F  - 7.3in ACeP e-Paper (F)  800x480px  7-Color
//   DISP_BW_V1 - 7.5in e-Paper (v1)      640x384px  Black/White
// Uncomment the macro that identifies your physical panel.
#define DISP_BW_V2
// #define DISP_3C_B
// #define DISP_7C_F
// #define DISP_BW_V1

// E-PAPER DRIVER BOARD
// The DESPI-C02 is the only officially supported driver board.
// Support for the Waveshare rev2.2 and rev2.3 is deprecated.
// The Waveshare rev2.2 is no longer in production.
// Users of the Waveshare rev2.3 have reported experiencing low contrast issues.
// Uncomment the macro that identifies your driver board hardware.
#define DRIVER_DESPI_C02
// #define DRIVER_WAVESHARE

// 3 COLOR E-INK ACCENT COLOR
// Defines the 3rd color to be used when a 3+ color display is selected.
#if defined(DISP_3C_B) || defined(DISP_7C_F)
  // #define ACCENT_COLOR GxEPD_BLACK
  #define ACCENT_COLOR GxEPD_RED
  // #define ACCENT_COLOR GxEPD_GREEN
  // #define ACCENT_COLOR GxEPD_BLUE
  // #define ACCENT_COLOR GxEPD_YELLOW
  // #define ACCENT_COLOR GxEPD_ORANGE
#endif

// LOCALE
// If your locale is not here, you can add it by copying and modifying one of
// the files in src/locales. Please feel free to create a pull request to add
// official support for your locale.
//   Language (Territory)            code
//   German (Germany)                de_DE
//   English (United Kingdom)        en_GB
//   English (United States)         en_US
//   Estonian (Estonia)              et_EE
//   Finnish (Finland)               fi_FI
//   French (France)                 fr_FR
//   Italiano (Italia)               it_IT
//   Dutch (Belgium)                 nl_BE
//   Portuguese (Brazil)             pt_BR
#define LOCALE en_US

// UNITS
// Define exactly one macro for each measurement type below.

// UNITS - TEMPERATURE
//   Metric   : Celsius
//   Imperial : Fahrenheit
// #define UNITS_TEMP_KELVIN
// #define UNITS_TEMP_CELSIUS
#define UNITS_TEMP_FAHRENHEIT

// UNITS - WIND SPEED
//   Metric   : Kilometers per Hour
//   Imperial : Miles per Hour
// #define UNITS_SPEED_METERSPERSECOND
// #define UNITS_SPEED_FEETPERSECOND
// #define UNITS_SPEED_KILOMETERSPERHOUR
#define UNITS_SPEED_MILESPERHOUR
// #define UNITS_SPEED_KNOTS
// #define UNITS_SPEED_BEAUFORT

// UNITS - PRESSURE
//   Metric   : Millibars
//   Imperial : Inches of Mercury
// #define UNITS_PRES_HECTOPASCALS
// #define UNITS_PRES_PASCALS
// #define UNITS_PRES_MILLIMETERSOFMERCURY
#define UNITS_PRES_INCHESOFMERCURY
// #define UNITS_PRES_MILLIBARS
// #define UNITS_PRES_ATMOSPHERES
// #define UNITS_PRES_GRAMSPERSQUARECENTIMETER
// #define UNITS_PRES_POUNDSPERSQUAREINCH

// UNITS - VISIBILITY DISTANCE
//   Metric   : Kilometers
//   Imperial : Miles
// #define UNITS_DIST_KILOMETERS
#define UNITS_DIST_MILES

// UNITS - PRECIPITATION (HOURLY)
// Measure of precipitation.
// This can either be Probability of Precipitation (PoP) or hourly volume.
//   Metric   : Millimeters
//   Imperial : Inches
#define UNITS_HOURLY_PRECIP_POP
// #define UNITS_HOURLY_PRECIP_MILLIMETERS
// #define UNITS_HOURLY_PRECIP_CENTIMETERS
// #define UNITS_HOURLY_PRECIP_INCHES

// UNITS - PRECIPITATION (DAILY)
// Measure of precipitation.
// This can either be Probability of Precipitation (PoP) or daily volume.
//   Metric   : Millimeters
//   Imperial : Inches
// #define UNITS_DAILY_PRECIP_POP
// #define UNITS_DAILY_PRECIP_MILLIMETERS
// #define UNITS_DAILY_PRECIP_CENTIMETERS
#define UNITS_DAILY_PRECIP_INCHES

// Hypertext Transfer Protocol (HTTP)
// HTTP
//   HTTP does not provide encryption or any security measures, making it highly
//   vulnerable to eavesdropping and data tampering. Has the advantage of using
//   less power.
// HTTPS_NO_CERT_VERIF
//   HTTPS without X.509 certificate verification provides encryption but lacks
//   authentication and is susceptible to man-in-the-middle attacks.
// HTTPS_WITH_CERT_VERIF
//   HTTPS with X.509 certificate verification offers the highest level of
//   security by providing encryption and verifying the identity of the server.
//
//   HTTPS with X.509 certificate verification comes with the draw back that
//   eventually the certificates on the esp32 will expire, requiring you to
//   update the certificates in cert.h and reflash this software.
//   Running cert.py will generate an updated cert.h file.
//   The current certificate for api.openweathermap.org is valid until
//   2030-12-31 23:59:59.
// (uncomment exactly one)
// #define USE_HTTP
// #define USE_HTTPS_NO_CERT_VERIF
#define USE_HTTPS_WITH_CERT_VERIF

// WIND DIRECTION INDICATOR
// Choose whether the wind direction indicator should be an arrow, number, or
// expressed in Compass Point Notation (CPN).
// The arrow indicator can be combined with NUMBER or CPN.
//
//   PRECISION                  #     ERROR   EXAMPLE
//   Cardinal                   4  ±45.000°   E
//   Intercardinal (Ordinal)    8  ±22.500°   NE
//   Secondary Intercardinal   16  ±11.250°   NNE
//   Tertiary Intercardinal    32   ±5.625°   NbE
#define WIND_INDICATOR_ARROW
// #define WIND_INDICATOR_NUMBER
// #define WIND_INDICATOR_CPN_CARDINAL
// #define WIND_INDICATOR_CPN_INTERCARDINAL
// #define WIND_INDICATOR_CPN_SECONDARY_INTERCARDINAL
// #define WIND_INDICATOR_CPN_TERTIARY_INTERCARDINAL
// #define WIND_INDICATOR_NONE

// WIND DIRECTION ICON PRECISION
// The wind direction icon shown to the left of the wind speed can indicate wind
// direction with a minimum error of ±0.5°. This uses more flash storage because
// 360 24x24 wind direction icons must be stored, totaling ~25kB. For either
// preference or in case flash space becomes a concern there are a handful of
// selectable options listed below. 360 points seems excessive, but the option
// is there.
//
//   PRECISION                  #     ERROR  STORAGE
//   Cardinal                   4  ±45.000°     288B  E
//   Intercardinal (Ordinal)    8  ±22.500°     576B  NE
//   Secondary Intercardinal   16  ±11.250°   1,152B  NNE
//   Tertiary Intercardinal    32   ±5.625°   2,304B  NbE
//   (360)                    360   ±0.500°  25,920B  1°
// Uncomment your preferred wind level direction precision.
// #define WIND_ICONS_CARDINAL
// #define WIND_ICONS_INTERCARDINAL
#define WIND_ICONS_SECONDARY_INTERCARDINAL
// #define WIND_ICONS_TERTIARY_INTERCARDINAL
// #define WIND_ICONS_360

// FONTS
// A handful of popular Open Source typefaces have been included with this
// project for your convenience. Change the font by selecting its corresponding
// header file.
//
//   FONT           HEADER FILE              FAMILY          LICENSE
//   FreeMono       FreeMono.h               GNU FreeFont    GNU GPL v3.0
//   FreeSans       FreeSans.h               GNU FreeFont    GNU GPL v3.0
//   FreeSerif      FreeSerif.h              GNU FreeFont    GNU GPL v3.0
//   Lato           Lato_Regular.h           Lato            SIL OFL v1.1
//   Montserrat     Montserrat_Regular.h     Montserrat      SIL OFL v1.1
//   Open Sans      OpenSans_Regular.h       Open Sans       SIL OFL v1.1
//   Poppins        Poppins_Regular.h        Poppins         SIL OFL v1.1
//   Quicksand      Quicksand_Regular.h      Quicksand       SIL OFL v1.1
//   Raleway        Raleway_Regular.h        Raleway         SIL OFL v1.1
//   Roboto         Roboto_Regular.h         Roboto          Apache v2.0
//   Roboto Mono    RobotoMono_Regular.h     Roboto Mono     Apache v2.0
//   Roboto Slab    RobotoSlab_Regular.h     Roboto Slab     Apache v2.0
//   Ubuntu         Ubuntu_R.h               Ubuntu font     UFL v1.0
//   Ubuntu Mono    UbuntuMono_R.h           Ubuntu font     UFL v1.0
//
// Adding new fonts is relatively straightforward, see fonts/README.
//
// Note:
//   The layout of the display was designed around spacing and size of the GNU
//   FreeSans font, but this project supports the ability to modularly swap
//   fonts. Using a font other than FreeSans may result in undesired spacing or
//   other artifacts.
#define FONT_HEADER "fonts/FreeSans.h"

// DAILY PRECIPITATION
// Daily precipitation indicated under Hi|Lo can optionally be configured using
// the following options.
//   0 : Disable (hide always)
//   1 : Enable (show always)
//   2 : Smart (show only when precipitation is forecasted)
#define DISPLAY_DAILY_PRECIP 2

// ALERTS
//   The handling of alerts is complex. Each country has a unique national alert
//   system that receives alerts from many different government agencies. This
//   results is huge variance in the formatting of alerts. OpenWeatherMap
//   provides alerts in English only. Any combination of these factors may make
//   it undesirable to display alerts in some regions.
//   Disable alerts by changing the DISPLAY_ALERTS macro to 0.
#define DISPLAY_ALERTS 1

// STATUS BAR EXTRAS
//   Extra information that can be displayed on the status bar. Set to 1 to
//   enable.
#define STATUS_BAR_EXTRAS_BAT_VOLTAGE 0
#define STATUS_BAR_EXTRAS_WIFI_RSSI   0

// BATTERY MONITORING
//   You may choose to power your weather display with or without a battery.
//   Low power behavior can be controlled in config.cpp.
//   If you wish to disable battery monitoring set this macro to 0.
#define BATTERY_MONITORING 1

// NON-VOLATILE STORAGE (NVS) NAMESPACE
#define NVS_NAMESPACE "weather_epd"

// DEBUG
//   If defined, enables increase verbosity over the serial port.
//   level 0: basic status information, assists troubleshooting (default)
//   level 1: increased verbosity for debugging
//   level 2: print api responses to serial monitor
#define DEBUG_LEVEL 0

// Set the below constants in "config.cpp"
extern const uint8_t PIN_BAT_ADC;
extern const uint8_t PIN_EPD_BUSY;
extern const uint8_t PIN_EPD_CS;
extern const uint8_t PIN_EPD_RST;
extern const uint8_t PIN_EPD_DC;
extern const uint8_t PIN_EPD_SCK;
extern const uint8_t PIN_EPD_MISO;
extern const uint8_t PIN_EPD_MOSI;
extern const uint8_t PIN_EPD_PWR;
extern const uint8_t PIN_BME_SDA;
extern const uint8_t PIN_BME_SCL;
extern const uint8_t PIN_BME_PWR;
extern const uint8_t BME_ADDRESS;
extern const char *WIFI_SSID;
extern const char *WIFI_PASSWORD;
extern const unsigned long WIFI_TIMEOUT;
extern const unsigned HTTP_CLIENT_TCP_TIMEOUT;
extern const String OWM_APIKEY;
extern const String OWM_ENDPOINT;
extern const String OWM_ONECALL_VERSION;
extern const String LAT;
extern const String LON;
extern const String CITY_STRING;
extern const char *TIMEZONE;
extern const char *TIME_FORMAT;
extern const char *HOUR_FORMAT;
extern const char *DATE_FORMAT;
extern const char *REFRESH_TIME_FORMAT;
extern const char *NTP_SERVER_1;
extern const char *NTP_SERVER_2;
extern const unsigned long NTP_TIMEOUT;
extern const int SLEEP_DURATION;
extern const int BED_TIME;
extern const int WAKE_TIME;
extern const int HOURLY_GRAPH_MAX;
extern const uint32_t WARN_BATTERY_VOLTAGE;
extern const uint32_t LOW_BATTERY_VOLTAGE;
extern const uint32_t VERY_LOW_BATTERY_VOLTAGE;
extern const uint32_t CRIT_LOW_BATTERY_VOLTAGE;
extern const unsigned long LOW_BATTERY_SLEEP_INTERVAL;
extern const unsigned long VERY_LOW_BATTERY_SLEEP_INTERVAL;
extern const uint32_t MAX_BATTERY_VOLTAGE;
extern const uint32_t MIN_BATTERY_VOLTAGE;

// CONFIG VALIDATION - DO NOT MODIFY
#if !(  defined(DISP_BW_V2)  \
      ^ defined(DISP_3C_B)   \
      ^ defined(DISP_7C_F)   \
      ^ defined(DISP_BW_V1))
  #error Invalid configuration. Exactly one display panel must be selected.
#endif
#if !(  defined(DRIVER_WAVESHARE) \
      ^ defined(DRIVER_DESPI_C02))
  #error Invalid configuration. Exactly one driver board must be selected.
#endif
#if !(defined(LOCALE))
  #error Invalid configuration. Locale not selected.
#endif
#if !(  defined(UNITS_TEMP_KELVIN)      \
      ^ defined(UNITS_TEMP_CELSIUS)     \
      ^ defined(UNITS_TEMP_FAHRENHEIT))
  #error Invalid configuration. Exactly one temperature unit must be selected.
#endif
#if !(  defined(UNITS_SPEED_METERSPERSECOND)   \
      ^ defined(UNITS_SPEED_FEETPERSECOND)     \
      ^ defined(UNITS_SPEED_KILOMETERSPERHOUR) \
      ^ defined(UNITS_SPEED_MILESPERHOUR)      \
      ^ defined(UNITS_SPEED_KNOTS)             \
      ^ defined(UNITS_SPEED_BEAUFORT))
  #error Invalid configuration. Exactly one wind speed unit must be selected.
#endif
#if !(  defined(UNITS_PRES_HECTOPASCALS)             \
      ^ defined(UNITS_PRES_PASCALS)                  \
      ^ defined(UNITS_PRES_MILLIMETERSOFMERCURY)     \
      ^ defined(UNITS_PRES_INCHESOFMERCURY)          \
      ^ defined(UNITS_PRES_MILLIBARS)                \
      ^ defined(UNITS_PRES_ATMOSPHERES)              \
      ^ defined(UNITS_PRES_GRAMSPERSQUARECENTIMETER) \
      ^ defined(UNITS_PRES_POUNDSPERSQUAREINCH))
  #error Invalid configuration. Exactly one pressure unit must be selected.
#endif
#if !(  defined(UNITS_DIST_KILOMETERS) \
      ^ defined(UNITS_DIST_MILES))
  #error Invalid configuration. Exactly one distance unit must be selected.
#endif
#if !(  defined(UNITS_HOURLY_PRECIP_POP)         \
      ^ defined(UNITS_HOURLY_PRECIP_MILLIMETERS) \
      ^ defined(UNITS_HOURLY_PRECIP_CENTIMETERS) \
      ^ defined(UNITS_HOURLY_PRECIP_INCHES))
  #error Invalid configuration. Exactly one houly precipitation measurement must be selected.
#endif
#if !(  defined(UNITS_DAILY_PRECIP_POP)         \
      ^ defined(UNITS_DAILY_PRECIP_MILLIMETERS) \
      ^ defined(UNITS_DAILY_PRECIP_CENTIMETERS) \
      ^ defined(UNITS_DAILY_PRECIP_INCHES))
  #error Invalid configuration. Exactly one daily precipitation measurement must be selected.
#endif
#if !(  defined(USE_HTTP)                   \
      ^ defined(USE_HTTPS_NO_CERT_VERIF)    \
      ^ defined(USE_HTTPS_WITH_CERT_VERIF))
  #error Invalid configuration. Exactly one HTTP mode must be selected.
#endif
#if !(  defined(WIND_INDICATOR_ARROW)                         \
      || (                                                    \
          defined(WIND_INDICATOR_NUMBER)                      \
        ^ defined(WIND_INDICATOR_CPN_CARDINAL)                \
        ^ defined(WIND_INDICATOR_CPN_INTERCARDINAL)           \
        ^ defined(WIND_INDICATOR_CPN_SECONDARY_INTERCARDINAL) \
        ^ defined(WIND_INDICATOR_CPN_TERTIARY_INTERCARDINAL)  \
      )                                                       \
      ^ defined(WIND_INDICATOR_NONE))
  #error Invalid configuration. Illegal selction of wind indicator(s).
#endif
#if defined(WIND_INDICATOR_ARROW)                   \
 && !(  defined(WIND_ICONS_CARDINAL)                \
      ^ defined(WIND_ICONS_INTERCARDINAL)           \
      ^ defined(WIND_ICONS_SECONDARY_INTERCARDINAL) \
      ^ defined(WIND_ICONS_TERTIARY_INTERCARDINAL)  \
      ^ defined(WIND_ICONS_360))
  #error Invalid configuration. Exactly one wind direction icon precision level must be selected.
#endif
#if !(defined(FONT_HEADER))
  #error Invalid configuration. Font not selected.
#endif
#if !(defined(DISPLAY_DAILY_PRECIP))
  #error Invalid configuration. DISPLAY_DAILY_PRECIP not defined.
#endif
#if !(defined(DISPLAY_ALERTS))
  #error Invalid configuration. DISPLAY_ALERTS not defined.
#endif
#if !(defined(BATTERY_MONITORING))
  #error Invalid configuration. BATTERY_MONITORING not defined.
#endif
#if !(defined(DEBUG_LEVEL))
  #error Invalid configuration. DEBUG_LEVEL not defined.
#endif

#endif

[lmarzen]

The link you sent is actually to a 3 color panel.
Try using

#define DISP_3C_B

[dorofino]

I tried that, and still the same issue persists.
At one point, and I don't know how/why, the screen turned like this.

and I finally installed the battery, and the same issue remains.

I am wondering is a problem with the display.

[lmarzen]

Probably not an issue with the panel itself. Most likely a wiring or software problem.

Try flipping the switch on the despi back and forth once. In the past some people have had similar issues when the switch appeared to be set all the way, and resetting it fixed it.

Try search some of the other issues if you haven't already. You will find some other similar problems with troubleshooting ideas and solutions.

[dorofino]

Could it be any of these settings? what do you mean 'micro-usb firebeetle'

// ADC pin used to measure battery voltage
const uint8_t PIN_BAT_ADC  = A2; // A0 for micro-usb firebeetle
// Pins for E-Paper Driver Board
const uint8_t PIN_EPD_BUSY = 14; // 5 for micro-usb firebeetle
const uint8_t PIN_EPD_CS   = 13;
const uint8_t PIN_EPD_RST  = 21;
const uint8_t PIN_EPD_DC   = 22;
const uint8_t PIN_EPD_SCK  = 18;
const uint8_t PIN_EPD_MISO = 19; // 19 Master-In Slave-Out not used, as no data from display
const uint8_t PIN_EPD_MOSI = 23;
const uint8_t PIN_EPD_PWR  = 26; // Irrelevant if directly connected to 3.3V
// I2C Pins used for BME280
const uint8_t PIN_BME_SDA = 17;
const uint8_t PIN_BME_SCL = 16;
const uint8_t PIN_BME_PWR =  4;   // Irrelevant if directly connected to 3.3V
const uint8_t BME_ADDRESS = 0x76; // If sensor does not work, try 0x77

[lmarzen]

If you are using an older version of the dfrobot firebeetle with a micro usb connector instead of the newer usb c version.

[dorofino]

no, i have the new firebeetle.

Quick question: How I go about testing other option/drivers and debugging see how can make it work?

[lmarzen]

This project uses the GxEPD2 driver library. There are some minimal hello world examples there if you follow the link. Else there are other driver libraries to, but I have personally not used them much.

[lmarzen]

The thick boarder around the edge of the screen is sometimes a symptom of low voltage in my experience. Maybe try connecting the wire that goes to the driver board's 3.3v pin directly to a 3.3v pin on the esp32.

[lmarzen]

If you want to mess around with the display initialization code it is in renderer.cpp:
https://github.com/lmarzen/esp32-weather-epd/blob/c7b343ddbea77a5acb12a5d2197948c79bec0e12/platformio/src/renderer.cpp#L223C1-L250C21

Maybe try moving the spi remap before the display init?

Like this...

  // remap spi
  SPI.end();
  SPI.begin(PIN_EPD_SCK,
            PIN_EPD_MISO,
            PIN_EPD_MOSI,
            PIN_EPD_CS);
  display.init(115200, true, 10, false);

Otherwise maybe you can try different init parameters from the examples in GxEPD2.

[dorofino]

The thick boarder around the edge of the screen is sometimes a symptom of low voltage in my experience. Maybe try connecting the wire that goes to the driver board's 3.3v pin directly to a 3.3v pin on the esp32.

So I believe I did it right, and I connected the DESPI-C02 pin 3.3v directly to that ESP32-E V1.0 pin 3V3

I also moved the SPI

  // remap spi
  SPI.end();
  SPI.begin(PIN_EPD_SCK,
            PIN_EPD_MISO,
            PIN_EPD_MOSI,
            PIN_EPD_CS);
  display.init(115200, true, 10, false);

And now after resetting I see this

WhatsApp.Video.2025-01-03.at.13.05.15_e6488211.mp4

[lmarzen]

Try changing the reset duration from 10 to 20 in display.init.

display.init(115200, true, 20, false);

[HKGDot]

I tried finding some sample of flashing tri-color screen. Hope this helps!
https://www.youtube.com/shorts/zvJQdnJr8ZQ

[veganhamster]

I had a similiar problem - maybe my solution is some idea for you?

I also started the project and had (with a b/w screen) only no-screen and in the end on disturbed line at the bottom. The code was correct installed on the esp32 and i can see, it loggged in correctly over the internet at openwather. Hmm.

So i remembered, at the beginning, I connected the battery and AFTER that, i recognize the polarity was wrong. Oops.

So, I changed the FireBeetle ESP with a new one, this time it worked like a charme... So maybe you can try this solution?

[blind-oracle]

In my case the display doesn't work either if I connect its power to some random pin (26 by default). If I switch it to 3.3v then all works fine.

I've tried setting the pin current capability higher using https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/peripherals/gpio.html#_CPPv429rtc_gpio_set_drive_capability10gpio_num_t16gpio_drive_cap_t but that didn't help either.