From 5acd91bf34332ecd5e98536120020d2106e3c482 Mon Sep 17 00:00:00 2001
From: Fisch <interfisch@gmx.net>
Date: Thu, 22 Oct 2020 20:31:52 +0200
Subject: [PATCH] add mhz19 5v info comment

---
 src/main.cpp | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index d1241f3..ee4785e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -104,9 +104,21 @@ struct sensordata
   // SW Serial
   //SW Serial RX: to mhz19 tx (green cable)
   //SW Serial TX: to mhz19 rx (blue cable)
-  //co2 sensor needs 5v
+  //co2 sensor needs 5v. Connect USB 5V directly (not through wemos d1 onboard diode which gives only 4.7V!)
 
   //if ABC is disabled (see in setup function) sensor should be calibrated manually. leave outdoors (=400ppm) with no direct sunlight for >20min, then connect HD pin to GND for at least 7 seconds.
+  /* Pinout  (view from top, connector at the bottom)
+  * Vin, GND, NC, PWM
+  *  |    |    |    |
+  * /-----------------\
+  * |                 |
+  * |                 |
+  * |                 |
+  * |                 |
+  * \-----------------/
+  *    |  |  |  |  |
+  *   Vo Rx Tx NC HD
+  */
 
   #include <SoftwareSerial.h>