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add mhz19 5v info comment

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interfisch 2020-10-22 20:31:52 +02:00
parent a53e00b216
commit 5acd91bf34
1 changed files with 13 additions and 1 deletions
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14
src/main.cpp
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@ -104,9 +104,21 @@ struct sensordata
// SW Serial // SW Serial
//SW Serial RX: to mhz19 tx (green cable) //SW Serial RX: to mhz19 tx (green cable)
//SW Serial TX: to mhz19 rx (blue 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. //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> #include <SoftwareSerial.h>