[wip]

ambient7-arduino/README.md

@@ -1,5 +1,23 @@
 # Ambient7 with Arduino compatible MCU
 
+## Hardware
+
+* MCU - Wemos D1 R1
+* Temperature/Humidity sensor – Asair (aka Aosong) AM2302 (DHT22)
+* CO2 Sensor – Winsen MH-Z19B
+
+All components may be replaced with analogues.
+
+## Implementations
+
+* [Arduino IDE based]()
+* [micropython](micropython-version/) – abandoned. lack of
+  software serial (UART) support.
+
+## Extra apps
+
+* [hello-world-led](hello-world-led/) – test arduino sketch
+
 ## Wemos D1 R1 setup
 
 ### ArduinoIDE

ambient7-arduino/arduino-ide-version/ambient7-mcu/ambient7-mcu.ino

@@ -0,0 +1,30 @@
+#include <SoftwareSerial.h>
+
+unsigned long startTime = millis();
+
+void setup() {
+  Serial.begin(9600);
+  pinMode(D3, INPUT);
+}
+
+void loop() {
+  Serial.println("------------------------------");
+  Serial.print("Time from start: ");
+  Serial.print((millis() - startTime) / 1000);
+  Serial.println(" s");
+  int ppm_pwm = readCO2PWM();
+  delay(5000);
+}
+
+int readCO2PWM() {
+  unsigned long th, tl, ppm_pwm = 0;
+  do {
+    th = pulseIn(D3, HIGH, 1004000) / 1000;
+    Serial.println("Step");
+    tl = 1004 - th;
+    ppm_pwm = 5000 * (th-2)/(th+tl-4);
+  } while (th == 0);
+  Serial.print("PPM PWM: ");
+  Serial.println(ppm_pwm);
+  return ppm_pwm;
+}

ambient7-arduino/arduino-ide-version/t1.cpp

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+#include <SoftwareSerial.h>
+
+unsigned long startTime = millis();
+
+void setup() {
+  Serial.begin(9600);
+  co2Serial.begin(9600);
+  pinMode(D3, INPUT);
+}
+
+void loop() {
+  Serial.println("------------------------------");
+  Serial.print("Time from start: ");
+  Serial.print((millis() - startTime) / 1000);
+  Serial.println(" s");
+  int ppm_pwm = readCO2PWM();
+  delay(5000);
+}
+
+int readCO2PWM() {
+  unsigned long th, tl, ppm_pwm = 0;
+  do {
+    th = pulseIn(D3, HIGH, 1004000) / 1000;
+    tl = 1004 - th;
+    ppm_pwm = 5000 * (th-2)/(th+tl-4);
+  } while (th == 0);
+  Serial.print("PPM PWM: ");
+  Serial.println(ppm_pwm);
+  return ppm_pwm;
+}