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en:automation:02-glossary:analog-inputs-hidden [2018/09/03 12:10] mkudlacek ↷ Page name changed from en:automation:02-glossary:40-analog-inputs to en:automation:02-glossary:analog-inputs-hidden |
en:automation:02-glossary:analog-inputs-hidden [2021/06/09 08:48] (current) avsetula |
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| ====== Analog inputs ====== | ====== Analog inputs ====== | ||
| + | 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. | ||
| + | ---- | ||
| + | |||
| + | <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: | ||
| + | * measuring 0-10V DC | ||
| + | * measuring 0-20mA DC | ||
| + | |||
| + | <WRAP center round tip 60%> | ||
| + | The Group 1 is also capable of measuring the resistance, but this is achievable with [[en:automation:02-glossary:analog-outputs-hidden|Analog output]]. | ||
| + | </WRAP> | ||
| + | |||
| + | 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 a 2-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, 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|}} | ||
| + | |||
| + | R_sens = the sensor itself | ||
| + | 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). | ||
| + | */ | ||
