From 23f8498ff972b0c67d0cd4f708e728c11d5a0630 Mon Sep 17 00:00:00 2001
From: Samuel Sieb <samuel-github@sieb.net>
Date: Sun, 17 Mar 2024 12:10:47 -0700
Subject: [PATCH] allow negative ppm for sensair (#6385)

---
 esphome/components/senseair/senseair.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/esphome/components/senseair/senseair.cpp b/esphome/components/senseair/senseair.cpp
index e0504eb2b9..e58ee157f7 100644
--- a/esphome/components/senseair/senseair.cpp
+++ b/esphome/components/senseair/senseair.cpp
@@ -54,9 +54,9 @@ void SenseAirComponent::update() {
   this->status_clear_warning();
   const uint8_t length = response[2];
   const uint16_t status = (uint16_t(response[3]) << 8) | response[4];
-  const uint16_t ppm = (uint16_t(response[length + 1]) << 8) | response[length + 2];
+  const int16_t ppm = int16_t((response[length + 1] << 8) | response[length + 2]);
 
-  ESP_LOGD(TAG, "SenseAir Received CO₂=%uppm Status=0x%02X", ppm, status);
+  ESP_LOGD(TAG, "SenseAir Received CO₂=%dppm Status=0x%02X", ppm, status);
   if (this->co2_sensor_ != nullptr)
     this->co2_sensor_->publish_state(ppm);
 }