From 804fa0360763d8107d063a353680d04cad893711 Mon Sep 17 00:00:00 2001
From: smueller <simon.mueller@sensirion.com>
Date: Wed, 15 May 2024 16:32:59 +0200
Subject: [PATCH] add warning to conditioning

add warning to:
- Readme
- Example Usage
- Function description
---
 README.md                 | 8 ++++++++
 sgp41_i2c.h               | 3 +++
 sgp41_i2c_example_usage.c | 2 ++
 3 files changed, 13 insertions(+)

diff --git a/README.md b/README.md
index 2b0318a..bbf96a7 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,14 @@ the following pins to connect your SGP41:
       ...
       ```
 
+## Conditioning
+
+After each restart of the sensor or when the hotplates have been switched off, the conditioning command must
+be called from idle mode. The conditioning heats the hotplate of the NOx pixel to a different temperature compared
+to the measurement mode enabling a faster switch-on thereafter.
+
+It is recommended to execute the conditioning for 10s, but **10s must not be exceeded** to avoid damage to the sensing material.
+
 ## Troubleshooting
 
 ### Initialization failed
diff --git a/sgp41_i2c.h b/sgp41_i2c.h
index e6192c5..baa839f 100644
--- a/sgp41_i2c.h
+++ b/sgp41_i2c.h
@@ -52,6 +52,9 @@ extern "C" {
  * different temperature for conditioning. This command returns only the
  * measured raw signal of the VOC pixel SRAW_VOC as 2 bytes (+ 1 CRC byte).
  *
+ * WARNING: To avoid damage to the sensing material the conditioning must not
+ * exceed 10s!
+ *
  * @param default_rh Default conditions for relative humidty.
  *
  * @param default_t Default conditions for temperature.
diff --git a/sgp41_i2c_example_usage.c b/sgp41_i2c_example_usage.c
index 44c5456..035ca5c 100644
--- a/sgp41_i2c_example_usage.c
+++ b/sgp41_i2c_example_usage.c
@@ -78,6 +78,8 @@ int main(void) {
     }
 
     // SGP41 conditioning during 10 seconds before measuring
+    // WARNING: To avoid damage to the sensing material the conditioning must
+    // not exceed 10s!
     for (int i = 0; i < 10; i++) {
         uint16_t sraw_voc;