From 36963daac6951be23df4479ce4d2714997af98e9 Mon Sep 17 00:00:00 2001
From: Stefan Brand <seiichiro@seiichiro0185.org>
Date: Tue, 6 Apr 2021 16:09:08 +0200
Subject: [PATCH] Enable Calibration on Sensair S8

---
 lib/MHZ19C/MHZ19C.cpp       |  2 +-
 lib/SENSAIRS8/SENSAIRS8.cpp | 16 ++++++++++++++++
 lib/SENSAIRS8/SENSAIRS8.h   |  5 +++--
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/lib/MHZ19C/MHZ19C.cpp b/lib/MHZ19C/MHZ19C.cpp
index 50d15b6..7f385aa 100644
--- a/lib/MHZ19C/MHZ19C.cpp
+++ b/lib/MHZ19C/MHZ19C.cpp
@@ -53,7 +53,7 @@ void MHZ19C::calibrate(void) {
   digitalWrite(calpin, LOW);
   delay(7500);
   digitalWrite(calpin, HIGH);
-  pinMode(PIN_PB4, INPUT_PULLUP);
+  pinMode(calpin, INPUT_PULLUP);
 }
 
 uint8_t MHZ19C::getSensorData(char * payload, uint8_t startbyte) {
diff --git a/lib/SENSAIRS8/SENSAIRS8.cpp b/lib/SENSAIRS8/SENSAIRS8.cpp
index 03e739a..db8cb26 100644
--- a/lib/SENSAIRS8/SENSAIRS8.cpp
+++ b/lib/SENSAIRS8/SENSAIRS8.cpp
@@ -49,6 +49,22 @@ uint8_t SENSAIRS8::getSensorData(char *payload, uint8_t startbyte) {
   return startbyte+2;
 }
 
+void SENSAIRS8::calibrate(void) {
+  pinMode(calpin, OUTPUT);
+  digitalWrite(calpin, LOW);
+  delay(5000);
+  digitalWrite(calpin, HIGH);
+  pinMode(calpin, INPUT_PULLUP);
+}
+
+void SENSAIRS8::initialize(void) {
+  // Disable Auto Background Calibration
+  uint8_t _cmd[8] = {0xFE, 0x06, 0x00, 0x01F, 0x00, 0x00, 0xAC, 0x03};
+  while (Serial.available() > 0) Serial.read();
+    Serial.write(_cmd, 8);
+    Serial.flush();
+}
+
 // Read a Sensor Response
 uint8_t SENSAIRS8::read() {
     // Number of returned Bytes
diff --git a/lib/SENSAIRS8/SENSAIRS8.h b/lib/SENSAIRS8/SENSAIRS8.h
index 2a8c0e9..a365821 100644
--- a/lib/SENSAIRS8/SENSAIRS8.h
+++ b/lib/SENSAIRS8/SENSAIRS8.h
@@ -35,6 +35,7 @@
 class SENSAIRS8 : public AttSensor {
   private:
     uint8_t buffer[SER_BUF_LEN];
+    pin_size_t calpin = PIN_PB4; // PB4 is the Calibration Pin on the Addon PCB
 
     uint8_t read();
     void zeroBuffer(void);
@@ -43,8 +44,8 @@ class SENSAIRS8 : public AttSensor {
   public:
     SENSAIRS8(void);
     uint8_t getSensorData(char *payload, uint8_t startbyte);
-    void calibrate(void) {};
-    void initialize(void) {};
+    void calibrate(void);
+    void initialize(void);
     uint8_t numBytes(void) {return 2;};
 };