More descriptions on the hook up.

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--- a/README.md
+++ b/README.md
@@ -3,4 +3,5 @@ Retrofitted controller for an IVT greenline 14e-9.
 The old controller gave up the magic smoke and this is my way to fix it. 
 
 The controller consists of a raspberry pi 3 with a DAQCplate for sensors and controlling relays.
 The old controller gave up the magic smoke and this is my way to fix it. 
 
 The controller consists of a raspberry pi 3 with a DAQCplate for sensors and controlling relays.

-I am using the original NTC thermistors. 
+I am using the original NTC thermistors.  The sensors are connected: one lead to +5V, the other lead to ADC input, and a 1.5kΩ between ADC input and GND. This makes a voltage divider and 1.5kΩ fits the complete sensor range for the ADC.
+A 5v relay is connected to the output. +5V to flyback protection and the othera lead to GND. The 5V relay run the big 3-phase relay for the compressor.