Hello,
I found a code online of how to display temperature and humidity into my SSD1306 OLED screen, however, I'm receiving an error message when compiling the code. I'm not sure what the error means. I'm using this code to see if my temperature and humidity module is working properly onto my OLED screen. I have installed all proper libraries.
Here's the code:
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
#define DHTPIN 2 // Digital pin connected to the DHT sensor
// Uncomment the type of sensor in use:
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(115200);
dht.begin();
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(2000);
display.clearDisplay();
display.setTextColor(WHITE);
}
void loop() {
delay(5000);
//read temperature and humidity
float t = dht.readTemperature();
float h = dht.readHumidity();
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
}
//clear display
display.clearDisplay();
// display temperature
display.setTextSize(1);
display.setCursor(0,0);
display.print("Temperature: ");
display.setTextSize(2);
display.setCursor(0,10);
display.print(t);
display.print(" ");
display.setTextSize(1);
display.cp437(true);
display.write(167);
display.setTextSize(2);
display.print("C");
// display humidity
display.setTextSize(1);
display.setCursor(0, 35);
display.print("Humidity: ");
display.setTextSize(2);
display.setCursor(0, 45);
display.print(h);
display.print(" %");
display.display();
}
Here's the error message I'm receiving when compiling the code:
Arduino: 1.8.10 (Windows 10), Board: "Arduino/Genuino Uno"
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0x7855fb]
goroutine 1 [running]:
github.com/arduino/arduino-cli/legacy/builder.ResolveLibrary(0x11cb45a0, 0x11cf406b, 0x5, 0x11cf406b)
/home/jenkins/workspace/arduino-builder-all-cross-cli-inception/src/github.com/arduino/arduino-cli/legacy/builder/resolve_library.go:64 +0x14b
github.com/arduino/arduino-cli/legacy/builder.findIncludesUntilDone(0x11cb45a0, 0x11eeece0, 0x88ed00, 0x11d7a690, 0x11f1e7e8, 0x11ed3a00, 0x0)
/home/jenkins/workspace/arduino-builder-all-cross-cli-inception/src/github.com/arduino/arduino-cli/legacy/builder/container_find_includes.go:358 +0x3b6
github.com/arduino/arduino-cli/legacy/builder.(*ContainerFindIncludes).Run(0xdebc68, 0x11cb45a0, 0xdebc68, 0x0)
/home/jenkins/workspace/arduino-builder-all-cross-cli-inception/src/github.com/arduino/arduino-cli/legacy/builder/container_find_includes.go:152 +0x3e5
github.com/arduino/arduino-cli/legacy/builder.runCommands(0x11cb45a0, 0x11c55e1c, 0x20, 0x20, 0x409a01, 0x1ffff, 0x0)
/home/jenkins/workspace/arduino-builder-all-cross-cli-inception/src/github.com/arduino/arduino-cli/legacy/builder/builder.go:210 +0xbd
github.com/arduino/arduino-cli/legacy/builder.(*Builder).Run(0x11c5df40, 0x11cb45a0, 0xdebbb4, 0x11c06c88)
/home/jenkins/workspace/arduino-builder-all-cross-cli-inception/src/github.com/arduino/arduino-cli/legacy/builder/builder.go:117 +0xb9c
github.com/arduino/arduino-cli/legacy/builder.RunBuilder(...)
/home/jenkins/workspace/arduino-builder-all-cross-cli-inception/src/github.com/arduino/arduino-cli/legacy/builder/builder.go:226
main.main()
/home/jenkins/workspace/arduino-builder-all-cross-cli-inception/src/github.com/arduino/arduino-builder/main.go:398 +0x6d2
C:\Program Files (x86)\Arduino\arduino-builder returned 2
Error compiling for board Arduino/Genuino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
