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--- en:automation:02-glossary:analog-inputs-hidden [2018/09/06 12:18]
mkudlacek
+++ en:automation:02-glossary:analog-inputs-hidden [2021/04/06 13:50]
avsetula
@@ Line 1: / Line 1: @@
 ====== Analog inputs ======
-Analog inputs (AI) are for measuring analog values such as voltage, current and resistance. These values are produced by sensors which indicate multiple states such as thermometers, tensometers, distance meters, luxmeters etc.
+Analog inputs (AI) are for measuring analog values such as DC voltage, current and resistance. These values are produced by sensors which indicate multiple states such as thermometers, tensometers, distance meters, lux meters etc.
-===== Analog inputs Neuron and Axon =====
+\\
-The functionality of AIs on Neuron and Axon is different on Group 1 and Group 2/3 and on Neuron extensions.
+<html><span class="kbBlueText">More information about analog inputs can be found in specific categories:</span></html>\\
+<tile>
+| en:hw:007-patron:description-of-io:04-description-of-ai     | Patron             | :en:hw:unipi-kb-icon-patron.png     |
+| en:hw:01-axon:description-of-io:04-description-of-ai        | Axon               | :en:hw:unipi-kb-icon-axon.png       |
+| en:hw:02-neuron:description-of-io:04-description-of-ai      | Neuron             | :en:hw:unipi-kb-icon-neuron.png     |
+| en:hw:03-unipi11:description-of-io:04-description-of-ai     | 1.1 & 1.1 Lite     | :en:hw:unipi-kb-icon-1.png          |
+| en:hw:04-extensions:description-of-io:04-description-of-ai  | Extension modules  | :en:hw:unipi-kb-icon-extension.png  |
+</tile>
+/*
+===== Analog inputs on Neuron and Axon =====
+The functionality of AIs on Neuron and Axon is different on Group 1 and Group 2/3 and Neuron extensions.
 On Group 1, the analog input is capable of:
@@ Line 13: / Line 26: @@
 </WRAP>
-On Group 2 and 3 and on the Neuron extensions, the analog input is capable of:
+On Group 2 and 3 and the Neuron extensions, the analog input is capable of:
   * measuring 0-10V DC
   * measuring 0-2.5V DC with higher precision
   * measuring of 0-20mA DC
-  * measuring of resistance 0-100kOhm via 2-wire method
+  * measuring of resistance 0-100kOhm via a 2-wire method
-  * measuring of resistance 0-2kOhm via more precise 3-wire method
+  * measuring of resistance 0-2kOhm via a more precise 3-wire method
-Changing between modes depends on the [[en:sw:00-start|software]] you are using.
+Changing between modes depends on the [[en:sw:00-start|software]] you are using, please follow the relevant tutorial.
 ==== Measuring voltage ====
 ==== Measuring current ====
+===== Analog inputs on Unipi 1.1 =====
+The Unipi 1.1 has two analog inputs and they are only capable of measuring voltage in a range of 0-10V DC.
 ==== Measuring resistance ====
+To measure resistance from the Unipi 1.1's AI (ie. by using PT1000 thermal probes), it is necessary to add a resistor according to the following scheme.
+{{:en:automation:02-glossary:unipi_ai.png?300|}}
-===== Analog inputs on Unipi 1.1 =====
+   R_sens = the sensor itself
-The UniPi 1.1 has two analog inputs and they are only capable of measuring voltage in a range of 0-10V DC.
+   R_ref = the reference resistor
+There is also a input resistor inside of the AI with the value:
+   R_ai = 12200ohm
+<WRAP center round alert 60%>
+For R_sens >= 200ohm, use R_ref = 1k. For R_sens < 200ohm, use R_ref = 10k
+</WRAP>
+The value at the AI is calculated from the voltage you read from the AI (V_ai)
+             Vcc - V_ai     R_ref * R_ai
+   R_sens = ------------ * --------------
+                V_ai        R_ref + R_ai
+The Vcc is the applied voltage (12V in the picture above).
+*/