Build Instructions

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• 1

  Getting the parts

• 2

  Wiring the scanner

  VCC -> 12v (since this scanner is USB power, you can supply it VCC from the ESP32)
  GND -> GND
  TTL-TX -> GPIO16
  TTL-RX -> GPIO17 
  

  
  

• 3

  Flashing the ESP

  This is the most important, the rest you can keep to your own ESPHome flavoring

  logger:
    level: INFO  # Clean logs
  
  uart:
    id: r35c
    tx_pin: GPIO17
    rx_pin: GPIO16
    baud_rate: 57600
    parity: NONE
  
  # Global storage for HA
  globals:
    - id: barcode_buffer
      type: std::string
      initial_value: '""'
    - id: last_scan_time
      type: uint32_t
      initial_value: '0'
  
  interval:
    - interval: 500ms
      then:
        - lambda: |-
            static char buf[64];  
            static int pos = 0;
            static uint32_t clear_time = 0;
            
            uint8_t byte;
            while (id(r35c).available()) {
              if (!id(r35c).read_byte(&byte)) break;
              
              if (byte == '\r' || byte == '\n') {
                if (pos > 0) {
                  buf[pos] = '\0';
                  if (millis() - id(last_scan_time) > 1000) {
                    id(barcode_buffer) = std::string(buf, pos);
                    id(dustbin_barcode).publish_state(id(barcode_buffer));
                    ESP_LOGI("BARCODE", "Dustbin: '%s'", buf);
                    id(last_scan_time) = millis();
                    clear_time = millis() + 3000;  // Clear in 3s
                  }
                  pos = 0;
                }
                break;
              }
              if (pos < 63) buf[pos++] = byte;
            }
            
            // Clear buffer after 3s delay
            if (clear_time > 0 && millis() > clear_time && id(barcode_buffer).length() > 0) {
              id(barcode_buffer) = "";
              id(dustbin_barcode).publish_state("");
              clear_time = 0;
              ESP_LOGI("BARCODE", "Buffer cleared");
            }
  
  text_sensor:
    - platform: template
      name: "Dustbin Barcode"
      id: dustbin_barcode
      lambda: |-
        return id(barcode_buffer);
      update_interval: never
  

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