Hello everybody,
I’m currently working on a project, where I control a BLDC motor with a potentiometer and some more things and in the end I want to print those values to an adafruit SSD_1306 OLED display. Therefore I need to get some data from the so called VESC (an ESC spezialised for e-skateboards etc). The VESC sends data via UART to my Arduino UNO Rev3. This alone works and I can see the data coming in in the serial monitor.
Also the display works fine an shows some strings and variables.
But I have major issues when getting data via the uart and print those values on the OLED. As soon as I uncomment the “Uart.getVescValue” which initializes the process of receiving the data and upload it to the UNO the OLED won’t turn on, my potentiometer does not work anymore and my BLDC motor obviously does not start anymore.
I tried all this with the I2C as well and with different baud rates, same issue.
To wrap things up, I get UART data (using SolidGeeks Library GitHub - SolidGeek/VescUart: An Arduino library for interfacing with the VESC over UART), I can write to my OLED as long as I do not receive data from the UART. Receiving data results in OLED turns off and poti does not work anymore.
In the picture you can see the output of my OLED. The “poti” value is no data from the UART, this value comes straight from the A0 Pin.
Is it just not possible with the Arduino UNO to read from the UART and send over SPI to the OLED due to only one Serial Port?
Or do I need to include another virtual serial port with the help of the <softwareSerial.h> library? Which I actually tried already but I guess I don’t really know how to do this.
Any help is highly appreciated. Thanks
Cheers
Heiko
Here the code:
#include <VescUart.h>
#include <Servo.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// *** SPI ***Declaration for SSD1306 display connected using software SPI (default case):
#define OLED_MOSI 9
#define OLED_CLK 10
#define OLED_DC 11
#define OLED_CS 12
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
/* Used for I²C
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
*/
VescUart UART;
Servo BLDC;
const uint8_t VescOutputPin = 6;
void setup() {
Serial.begin(9600);
// ***___ setup für UART___***
while (!Serial) {
;
}
UART.setSerialPort(&Serial);
//_______________________________________***
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println("SSD1306 allocation failed");
for(;;); // Don't proceed, loop forever
}
// ***___ setup für PWM___***
BLDC.attach(VescOutputPin);
BLDC.writeMicroseconds(1480);
//***_________________________________***
// ***___ setup für OLED___***
display.begin(SSD1306_SWITCHCAPVCC);
display.display();
delay(1000);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(5, 4);
display.println("Projektarbeit");
display.setCursor(30, 24);
display.println("Heiko");
display.setCursor(55, 44);
display.println("2020");
display.display();
delay(4000);
//***_________________________________***
}
void loop() {
int PotiPin = analogRead(A0);
BLDC.writeMicroseconds(map(analogRead(PotiPin), 0 , 1023, 1000, 2419)); //PWM with Poti Pin
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(5, 44);
display.println("Poti:");
display.setCursor(80, 44);
display.print(PotiPin);
display.setCursor(5, 4);
display.println("Volt:");
display.setCursor(5, 24);
display.println("RPM:");
display.display();
//***_____Get values via UART from VESC_____***
/* if (UART.getVescValues()) {
Serial.println("RPM");
Serial.println(UART.data.rpm);
Serial.println("Tachometer");
Serial.println(UART.data.tachometer);
Serial.println("Input Voltage");
Serial.println(UART.data.inpVoltage);
Serial.println("Average Motor current");
Serial.println(UART.data.avgMotorCurrent);
Serial.println("Average Input Current");
Serial.println(UART.data.avgInputCurrent);
}
*/
//Input Voltage
display.setCursor(80, 4);
display.println(UART.data.inpVoltage);
//RPM Werte
display.setCursor(80, 24);
display.print(UART.data.rpm);
display.display();
}
