document arduino mq7 setup

[air-quality] / README

diff --git a/README b/README
index e54c333..d8b6ab1 100644 (file)
--- a/README
+++ b/README
@@ -1,6 +1,6 @@
 Experiments with air quality sensors
 
-Scripts in this directory read from sesor serial port output (which
+Scripts in this directory read from sensor serial port output (which
 is 3.3V serial connected to usb serial dongle) and store data to
 influxdb using curl.
 
@@ -12,3 +12,16 @@ network latency to influxdb (which is somewhere in the cloud, and
 latency can vary just enough to create empty vertical stripes in
 graphs which is ugly and incorrect).
 
+
+Exception to that rule is dsm501.pl which is general serial to
+influx bridge used by helper shell scripts to handle sensors
+which require 5V by connecting them to Arduino-like mcu.
+Example of that is:
+
+mq7.sh
+
+which uses https://github.com/dpavlin/mq7-co-monitor/
+
+on Arduino to produce output which is then fed to dsm501.pl.
+
+