From: Mikael Frykholm Date: Sun, 26 Nov 2017 12:42:26 +0000 (+0100) Subject: More descriptions on the hook up. X-Git-Url: https://git.frykholm.com/heatpump.git/commitdiff_plain/75ae0d85ebac93a5ea7a3d599827ac1758ffd0f3 More descriptions on the hook up. --- diff --git a/README.md b/README.md index 1a8d921..e544812 100644 --- 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. -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.