From 18e08cd9f9132ec61254ae68fa8e7d88c77d6834 Mon Sep 17 00:00:00 2001
From: Paolo Leggio <paolo@digitalmonkeys.it>
Date: Thu, 16 Oct 2025 15:06:10 +0200
Subject: [PATCH] Added support for BH1750 during i2C detection

---
 src/detect/ScanI2C.h          |  3 ++-
 src/detect/ScanI2CTwoWire.cpp | 21 ++++++++++++++++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/detect/ScanI2C.h b/src/detect/ScanI2C.h
index 2e602338c..e7bdf58c5 100644
--- a/src/detect/ScanI2C.h
+++ b/src/detect/ScanI2C.h
@@ -82,7 +82,8 @@ class ScanI2C
         BHI260AP,
         BMM150,
         TSL2561,
-        DRV2605
+        DRV2605,
+        BH1750
     } DeviceType;
 
     // typedef uint8_t DeviceAddress;
diff --git a/src/detect/ScanI2CTwoWire.cpp b/src/detect/ScanI2CTwoWire.cpp
index da2a57fee..ef438d27b 100644
--- a/src/detect/ScanI2CTwoWire.cpp
+++ b/src/detect/ScanI2CTwoWire.cpp
@@ -485,7 +485,26 @@ void ScanI2CTwoWire::scanPort(I2CPort port, uint8_t *address, uint8_t asize)
                 SCAN_SIMPLE_CASE(LTR390UV_ADDR, LTR390UV, "LTR390UV", (uint8_t)addr.address);
                 SCAN_SIMPLE_CASE(PCT2075_ADDR, PCT2075, "PCT2075", (uint8_t)addr.address);
                 SCAN_SIMPLE_CASE(CST328_ADDR, CST328, "CST328", (uint8_t)addr.address);
-                SCAN_SIMPLE_CASE(LTR553ALS_ADDR, LTR553ALS, "LTR553ALS", (uint8_t)addr.address);
+            case LTR553ALS_ADDR: // 0x23 - condiviso con BH1750
+                // Test first LTR553ALS (has identifiable registers)
+                registerValue = getRegisterValue(ScanI2CTwoWire::RegisterLocation(addr, 0x86), 1); // Part ID register
+                if (registerValue == 0x92) {                                                       // LTR553ALS Part ID
+                    type = LTR553ALS;
+                    logFoundDevice("LTR553ALS", (uint8_t)addr.address);
+                } else {
+                    // Test BH1750 - send power on command
+                    i2cBus->beginTransmission(addr.address);
+                    i2cBus->write(0x01); // Power On command
+                    uint8_t bh1750_error = i2cBus->endTransmission();
+                    if (bh1750_error == 0) {
+                        type = BH1750;
+                        logFoundDevice("BH1750", (uint8_t)addr.address);
+                    } else {
+                        LOG_INFO("Device found at address 0x%x was not able to be enumerated", (uint8_t)addr.address);
+                    }
+                }
+                break;
+
                 SCAN_SIMPLE_CASE(BHI260AP_ADDR, BHI260AP, "BHI260AP", (uint8_t)addr.address);
                 SCAN_SIMPLE_CASE(SCD4X_ADDR, SCD4X, "SCD4X", (uint8_t)addr.address);
                 SCAN_SIMPLE_CASE(BMM150_ADDR, BMM150, "BMM150", (uint8_t)addr.address);