From fe0234280e1160ce35914d02293182f94fb09e04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20K=C3=A4ppler?= <michael_kaeppler@web.de>
Date: Wed, 28 Apr 2021 21:15:43 +0200
Subject: [PATCH] co2_sensor: Reset SCD30 after startup

Sometimes after a hard reset of the ESP the SCD30
needs a long time until returning the first measurement.
Resetting it after startup seems to fix this behaviour.
---
 ampel-firmware/co2_sensor.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ampel-firmware/co2_sensor.cpp b/ampel-firmware/co2_sensor.cpp
index 3b2e3c2..8756ca0 100644
--- a/ampel-firmware/co2_sensor.cpp
+++ b/ampel-firmware/co2_sensor.cpp
@@ -83,6 +83,11 @@ namespace sensor {
       ESP.restart();
     }
 
+    // Changes of the SCD30's measurement timestep do not come into effect
+    // before the next measurement takes place. That means that after a hard reset
+    // of the ESP the SCD30 sometimes needs a long time until switching back to 2 s
+    // for acclimatization. Resetting it after startup seems to fix this behaviour.
+    scd30.reset();
     switchState(BOOTUP);
 
     Serial.print(F("Setting temperature offset to -"));
-- 
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