TTGO-T Display i/o outputs

Using Arduino Displays
1

Good day.

Been baffled on this silly question perhaps as i cannot find any info on this issue or functionality for the inputs/outputs.
My big question today would be for the original TTGO-T display getting pins 32, 38 and 39 to work as an output.

As i have my code now, the TFT is working and showing green screen, detects when a button was pressed but not pulling pin 38 LOW

I tried various ways to to set pin 38 low even tried to test the input button with basic sketches for input/output but same similar results.
My code:

#include <Button2.h>
#include <Hardware.h>

#include <Adafruit_GFX.h>
#include <Adafruit_ST7789.h>
#include <SPI.h>

#define TFT_MOSI 19
#define TFT_SCLK 18
#define TFT_CS 5
#define TFT_DC 16
#define TFT_RST 23
#define TFT_BL 4

uint8_t Button = 36;
uint8_t Pump = 38;
// tried: const int Pump = 38;
byte currentButtonState;

Adafruit_ST7789 tft = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);

void setup() {
  Serial.begin(115200);
  pinMode(TFT_BL, OUTPUT);
  digitalWrite(TFT_BL, HIGH);
  tft.init(135, 240);
  tft.fillScreen(ST77XX_GREEN);

pinMode(Button, INPUT_PULLUP);
pinMode(Pump, OUTPUT);
digitalWrite(Pump, HIGH);

}

void loop() {

currentButtonState = digitalRead(Button);
if (currentButtonState == LOW) {
    digitalWrite(Pump, LOW);
    Serial.println("Relay Switched On");
        delay(5000);
        digitalWrite(Pump, HIGH);
            Serial.println("Relay Switched Off");
}
}

On the serial side looping every 5 seconds: E (667770) gpio: gpio_set_level(226): GPIO output gpio_num error
Relay Switched Off
E (667770) gpio: gpio_set_level(226): GPIO output gpio_num error
Relay Switched On

For the genuises out there to give me some pointers or code changes will be much appreciated.

2

I don't know the Arduino 101 which apparently is based on an Intel Curie chip. However, the documentation https://docs.arduino.cc/retired/boards/arduino-101-619 contains this statement: "The 101 comes with 14 digital input/output pins". That, together with the error messages you listed would cause me to question if the following are valid choices for IO pins:

uint8_t Button = 36;
uint8_t Pump = 38;

Have you seen any examples using these numbers and which physical pins on the 101 have you connected these to ?

3

And i posted in the wrong section...

It is not the Ardiuno 101 but a TTGO T - Display ESP32 board.
I did try int Pump = 38; also, same results

4

See here for which gpio pins you can safely use on an ESP32: ESP32 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials

5

Thanks for helping @6v6gt.
It seems it will not work as i anticipated looking at the chematic unless im wrong here.

ttgo io
ttgo io632×506 67.3 KB

In the end i will need 2 inputs and 4 outputs as 36, 37, 38, 39, 32 and 27 as per pcb markings

pinout
pinout377×532 108 KB

6

I have moved your topic to a more appropriate forum category.

In the future, please take the time to pick the forum category that best suits the subject of your question. There is an "About the _____ category" topic at the top of each category that explains its purpose.

Thanks in advance for your cooperation.

7

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.