Hi there,
This is an issue I am having with the TTGO
I have followed the instructions from this site
With the following code:
#include <TFT_eSPI.h>
#include <SPI.h>
#include "WiFi.h"
#include <Wire.h>
#include <Button2.h>
#include "esp_adc_cal.h"
#include "bmp.h"
#ifndef TFT_DISPOFF
#define TFT_DISPOFF 0x28
#endif
#ifndef TFT_SLPIN
#define TFT_SLPIN 0x10
#endif
#define TFT_MOSI 19
#define TFT_SCLK 18
#define TFT_CS 5
#define TFT_DC 16
#define TFT_RST 23
#define TFT_BL 4 // Display backlight control pin
#define ADC_EN 14
#define ADC_PIN 34
#define BUTTON_1 35
#define BUTTON_2 0
TFT_eSPI tft = TFT_eSPI(135, 240); // Invoke custom library
Button2 btn1(BUTTON_1);
Button2 btn2(BUTTON_2);
char buff[512];
int vref = 1100;
int btnCick = false;
//! Long time delay, it is recommended to use shallow sleep, which can effectively reduce the current consumption
void espDelay(int ms)
{
esp_sleep_enable_timer_wakeup(ms * 1000);
esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH,ESP_PD_OPTION_ON);
esp_light_sleep_start();
}
void showVoltage()
{
static uint64_t timeStamp = 0;
if (millis() - timeStamp > 1000) {
timeStamp = millis();
uint16_t v = analogRead(ADC_PIN);
float battery_voltage = ((float)v / 4095.0) * 2.0 * 3.3 * (vref / 1000.0);
String voltage = "Voltage :" + String(battery_voltage) + "V";
Serial.println(voltage);
tft.fillScreen(TFT_BLACK);
tft.setTextDatum(MC_DATUM);
tft.drawString(voltage, tft.width() / 2, tft.height() / 2 );
}
}
void button_init()
{
btn1.setLongClickHandler([](Button2 & b) {
btnCick = false;
int r = digitalRead(TFT_BL);
tft.fillScreen(TFT_BLACK);
tft.setTextColor(TFT_GREEN, TFT_BLACK);
tft.setTextDatum(MC_DATUM);
tft.drawString("Press again to wake up", tft.width() / 2, tft.height() / 2 );
espDelay(6000);
digitalWrite(TFT_BL, !r);
tft.writecommand(TFT_DISPOFF);
tft.writecommand(TFT_SLPIN);
esp_sleep_enable_ext1_wakeup(GPIO_SEL_35, ESP_EXT1_WAKEUP_ALL_LOW);
esp_deep_sleep_start();
});
btn1.setPressedHandler([](Button2 & b) {
Serial.println("Detect Voltage..");
btnCick = true;
});
btn2.setPressedHandler([](Button2 & b) {
btnCick = false;
Serial.println("btn press wifi scan");
wifi_scan();
});
}
void button_loop()
{
btn1.loop();
btn2.loop();
}
void wifi_scan()
{
tft.setTextColor(TFT_GREEN, TFT_BLACK);
tft.fillScreen(TFT_BLACK);
tft.setTextDatum(MC_DATUM);
tft.setTextSize(1);
tft.drawString("Scan Network", tft.width() / 2, tft.height() / 2);
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
int16_t n = WiFi.scanNetworks();
tft.fillScreen(TFT_BLACK);
if (n == 0) {
tft.drawString("no networks found", tft.width() / 2, tft.height() / 2);
} else {
tft.setTextDatum(TL_DATUM);
tft.setCursor(0, 0);
Serial.printf("Found %d netn", n);
for (int i = 0; i < n; ++i) {
sprintf(buff,
"[%d]:%s(%d)",
i + 1,
WiFi.SSID(i).c_str(),
WiFi.RSSI(i));
tft.println(buff);
}
}
WiFi.mode(WIFI_OFF);
}
void setup()
{
#include "bmp.h"
Serial.begin(115200);
Serial.println("Start");
tft.init();
tft.setRotation(1);
tft.fillScreen(TFT_BLACK);
tft.setTextSize(2);
tft.setTextColor(TFT_WHITE);
tft.setCursor(0, 0);
tft.setTextDatum(MC_DATUM);
tft.setTextSize(1);
if (TFT_BL > 0) { // TFT_BL has been set in the TFT_eSPI library in the User Setup file TTGO_T_Display.h
pinMode(TFT_BL, OUTPUT); // Set backlight pin to output mode
digitalWrite(TFT_BL, TFT_BACKLIGHT_ON); // Turn backlight on. TFT_BACKLIGHT_ON has been set in the TFT_eSPI library in the User Setup file TTGO_T_Display.h
}
tft.setSwapBytes(true);
tft.pushImage(0, 0, 240, 135, ttgo);
espDelay(5000);
tft.setRotation(0);
int i = 5;
while (i--) {
tft.fillScreen(TFT_RED);
espDelay(1000);
tft.fillScreen(TFT_BLUE);
espDelay(1000);
tft.fillScreen(TFT_GREEN);
espDelay(1000);
}
button_init();
esp_adc_cal_characteristics_t adc_chars;
esp_adc_cal_value_t val_type = esp_adc_cal_characterize((adc_unit_t)ADC_UNIT_1, (adc_atten_t)ADC1_CHANNEL_6, (adc_bits_width_t)ADC_WIDTH_BIT_12, 1100, &adc_chars);
//Check type of calibration value used to characterize ADC
if (val_type == ESP_ADC_CAL_VAL_EFUSE_VREF) {
Serial.printf("eFuse Vref:%u mV", adc_chars.vref);
vref = adc_chars.vref;
} else if (val_type == ESP_ADC_CAL_VAL_EFUSE_TP) {
Serial.printf("Two Point --> coeff_a:%umV coeff_b:%umVn", adc_chars.coeff_a, adc_chars.coeff_b);
} else {
Serial.println("Default Vref: 1100mV");
}
}
void loop()
{
if (btnCick) {
showVoltage();
}
button_loop();
}
When verifying the code I receive the following error:-
In file included from C:\Users\User\Documents\Arduino\sketch_apr13b\sketch_apr13b.ino:7:0:
C:\Users\User\Documents\Arduino\libraries\TFT_eSPI/bmp.h:20:1: error: stray '@' in program
@lewisxhe lewisxhe add sch
^
In file included from C:\Users\User\Documents\Arduino\sketch_apr13b\sketch_apr13b.ino:130:0:
C:\Users\User\Documents\Arduino\libraries\TFT_eSPI/bmp.h:20:1: error: stray '@' in program
@lewisxhe lewisxhe add sch
^
In file included from C:\Users\User\Documents\Arduino\sketch_apr13b\sketch_apr13b.ino:7:0:
C:\Users\User\Documents\Arduino\libraries\TFT_eSPI/bmp.h:1:1: error: 'Skip' does not name a type
Skip to content
^
In file included from C:\Users\User\Documents\Arduino\sketch_apr13b\sketch_apr13b.ino:130:0:
C:\Users\User\Documents\Arduino\libraries\TFT_eSPI/bmp.h: In function 'void setup()':
C:\Users\User\Documents\Arduino\libraries\TFT_eSPI/bmp.h:1:1: error: 'Skip' was not declared in this scope
Skip to content
^
sketch_apr13b:148:36: error: 'ttgo' was not declared in this scope
tft.pushImage(0, 0, 240, 135, ttgo);
^
Multiple libraries were found for "WiFi.h"
Used: C:\Users\User\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\WiFi
Not used: C:\Program Files (x86)\Arduino\libraries\WiFi
Using library TFT_eSPI at version 2.2.0 in folder: C:\Users\User\Documents\Arduino\libraries\TFT_eSPI
Using library SPI at version 1.0 in folder: C:\Users\User\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\SPI
Using library FS at version 1.0 in folder: C:\Users\User\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\FS
Using library SPIFFS at version 1.0 in folder: C:\Users\User\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\SPIFFS
Using library WiFi at version 1.0 in folder: C:\Users\User\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\WiFi
Using library Wire at version 1.0.1 in folder: C:\Users\User\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\Wire
Using library Button2-master at version 1.1.0 in folder: C:\Users\User\Documents\Arduino\libraries\Button2-master
exit status 1
'ttgo' was not declared in this scope
For some there is an issue with the lines
#include "bmp.h"
tft.pushImage(0, 0, 240, 135, ttgo);
When I comment out both those lines the code verifies OK and I can upload it to the board and it runs just fine.
The bmp.h file is the same one from this Github page here
Any idea what the issue could be?
Please let me know if any further information is required.
Thanks very much for any suggestions