From 3b207db27c44113a2fd95b805d9af312d89f106e Mon Sep 17 00:00:00 2001
From: FransOv <57999223+FransOv@users.noreply.github.com>
Date: Sat, 12 Jul 2025 21:20:16 +0200
Subject: [PATCH] Correct handling of passive response of Winsen ZH03X Particle
 sensor in xsns_18_pms5003.ino (#23651)

* Update xsns_18_pms5003.ino

* Update xsns_18_pms5003.ino
---
 .../tasmota_xsns_sensor/xsns_18_pms5003.ino   | 30 +++++++++----------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/tasmota/tasmota_xsns_sensor/xsns_18_pms5003.ino b/tasmota/tasmota_xsns_sensor/xsns_18_pms5003.ino
index 88380531c..a60b09dcf 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_18_pms5003.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_18_pms5003.ino
@@ -205,28 +205,26 @@ bool ZH03ReadDataPassive() // process the passive mode response of the ZH03x sen
   AddLogBuffer(LOG_LEVEL_DEBUG_MORE, buffer, 9);
  
   uint8_t sum = 0;
-  for (uint32_t i = 1; i < 7; i++) {
+  for (uint32_t i = 1; i < 8; i++) {
     sum += buffer[i];
   }
-  sum=(~sum)+1;
+  sum=~(sum)+1;
   if (sum != buffer[8]) { 
     AddLog(LOG_LEVEL_DEBUG, PSTR("ZH03x: " D_CHECKSUM_FAILURE));
     return false;
   }
-
-  uint16_t buffer_u16[12];
-  for (uint32_t i = 1; i < 4; i++) { 
-    buffer_u16[i] = buffer[i*2 + 1];
-    buffer_u16[i] += (buffer[i*2] << 8);
-    buffer_u16[i+3] = buffer[i*2 + 1];      // Direct and Environment values identical
-    buffer_u16[i+3] += (buffer[i*2] << 8);  // Direct and Environment values identical
-    buffer_u16[0] = 20;                     // set dummy framelength
-    buffer_u16[11] = buffer[8];             // copy checksum
-  }
+ 
+  pms_data.pm10_standard = buffer[6]*256+buffer[7];
+  pms_data.pm10_env = pms_data.pm10_standard;       // Direct and Environment values identical
+  pms_data.pm25_standard = buffer[2]*256+buffer[3];
+  pms_data.pm25_env = pms_data.pm25_standard;       // Direct and Environment values identical
+  pms_data.pm100_standard = buffer[4]*256+buffer[5];
+  pms_data.pm100_env = pms_data.pm100_standard;     // Direct and Environment values identical
+  pms_data.framelen = 20;                           // set dummy framelength
+  pms_data.checksum = buffer[8];                    // copy checksum
   
-    memcpy((void *)&pms_data, (void *)buffer_u16, 22); 
-  
-  Pms.valid = 10;
+ 
+  Pms.valid = Settings->pms_wake_interval*2;
 
   if (!Pms.discovery_triggered) {
     TasmotaGlobal.discovery_counter = 1;      // Force discovery
@@ -531,4 +529,4 @@ bool Xsns18(uint32_t function)
   return result;
 }
 
-#endif  // USE_PMS5003
\ No newline at end of file
+#endif  // USE_PMS5003