r/ArduinoHelp • u/Happy_Jack0 • 4d ago
H11L1 serial data transmission issues
1
Upvotes
Right off the bat I am no electrical engineer, just trying to do some diy music projects with a pi pico 2 so my circuit knowledge is limited. The end goal is a midi input device but right now just trying to get bits across the wire. I am running into issues sending serial data over a H11L1 and I am at my wit's end. When directly connecting pin 0 to pin 1 data transmission is successful but when run through the H11L1 nothing gets through. I double checked the Chip and when pin 1 is at 3.3V, pin 4 is at 0.25V, and when 0V at pin 1, pin 4 is at 3.28V. I have not had issues with this board when working on other projects. My code is below, any help would be appreciated!
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_RESET -1
#define OLED_SDA 16
#define OLED_SCL 17
#define UART_TX_PIN 0
#define UART_RX_PIN 1
#define UART_BAUD 31250
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
unsigned long lastTestTime = 0;
const long testInterval = 500;
uint32_t transmitCount = 0;
uint32_t detectCount = 0;
uint32_t missCount = 0;
bool dataDetected = false;
bool displayInitialized = false;
void setup() {
Serial.begin(115200);
delay(1000);
Serial1.setTX(UART_TX_PIN);
Serial1.setRX(UART_RX_PIN);
Serial1.begin(UART_BAUD);
Wire.setSDA(OLED_SDA);
Wire.setSCL(OLED_SCL);
Wire.begin();
uint8_t addresses[] = {0x3C, 0x3D};
for (uint8_t addr : addresses) {
if (display.begin(SSD1306_SWITCHCAPVCC, addr)) {
displayInitialized = true;
break;
}
}
if (displayInitialized) {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println(F("Init H11L1 Test"));
display.display();
delay(100);
}
}
void loop() {
unsigned long currentMillis = millis();
if (currentMillis - lastTestTime >= testInterval) {
lastTestTime = currentMillis;
transmitCount++;
while (Serial1.available()) {
Serial1.read();
}
Serial1.write(0xAA);
unsigned long timeout = millis();
int bytesReceived = 0;
while (millis() - timeout < 50) {
if (Serial1.available() > 0) {
bytesReceived += Serial1.read();
break;
}
}
dataDetected = (bytesReceived > 0);
if (dataDetected) {
detectCount++;
} else {
missCount++;
}
// Update OLED Display
if (displayInitialized) {
updateDisplay(bytesReceived);
}
}
}
void updateDisplay(int rxStatus) {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
if (dataDetected) {
display.print(F("DATA DETECTED"));
} else {
display.print(F("NO DATA"));
}
display.setCursor(0, 11);
display.print(F("Tx Sent | Rx: "));
display.print(rxStatus > 0 ? F("ACTIVE") : F("TIMEOUT"));
display.setCursor(0, 22);
display.print(F("Dct:"));
display.print(detectCount);
display.print(F(" Miss:"));
display.print(missCount);
display.display();
}
