[MKC-1351] OPAMP Docs

content/hardware/02.hero/boards/uno-r4-minima/tutorials/opamp/opamp.md

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+---
+title: 'Arduino UNO R4 Minima OPAMP'
+description: 'Learn how to use the built-in Operational Amplifier in the UNO R4 Minima'
+tags:
+  - OPAMP
+author: 'Maximilian Gerhardt, Hannes Siebeneicher'
+hardware:
+  - hardware/02.hero/boards/uno-r4-minima
+software:
+  - web-editor
+  - ide-v1
+  - ide-v2
+---
+
+In this tutorial, you will learn how to use the built-in operational amplifier (OPAMP) featured on the [Arduino UNO R4 Minima](https://store.arduino.cc/products/uno-r4-minima). Operational amplifiers are very versatile and can be used to e.g. mirror an electrical signal or amplify it. 
+
+## Goals
+
+In this article, you will learn:
+- about the OPAMP feature onboard the UNO R4 Minima,
+- about the basics of the OPAMP library, 
+- how to mirror a voltage signal,
+- how to amplify a voltage signal.
+
+## Hardware & Software Needed
+  To follow along with this article, you will need the following hardware: 
+
+  - [Arduino UNO R4 Minima](https://store.arduino.cc/uno-r4-minima)
+  - resistors 
+  - Jumper wires
+
+
+## Operational Amplifier (OPAMP)
+
+An OPAMP is a versatile and widely used electronic component that belongs to the class of analog integrated circuits. Its primary function is to amplify voltage signals but they are very versatile and can be used to:
+
+- mirror an input voltage to its output,
+- amplify a small analog voltage to its output pin, output voltage range from 0 to ~4.7 V,
+- compare two input voltages and give a binary "higher" or "lower" output,
+- integrate and differentiate signals.
+
+## Voltage Follower
+
+The simplest way to test the OPAMP is to configure it as a voltage follower by connecting A2 to A3. In this setup, the voltage at A3 should mimic the voltage applied to A1. For instance, if you connect A1 to the ground (GND), the OPAMP output at A3 should also be at the ground potential. Similarly, if you connect A1 to 3.3 V, the output at A3 should be approximately 3.3 V.
+
+## Circuit
+
+![Voltage Follower Circuit](./assets/circuitFollowerMinima.png)
+
+## Voltage Amplifier
+
+***Do NOT amplify the voltage provided by a battery as this can pose serious safety risks!***
+
+A voltage amplifier, as the name suggests, amplifies the voltage. A simple 2x amplifier can be built using e.g. two `10k` resistors. Connect one resistor between "minus" and GND. Then use the second resistor to connect the output and "minus" together. Any signal input at "plus" will now appear with double the amplitude at the output pin. Of course, the input signal and the Arduino board should share the same `GND`. 
+
+***The amplified output signal should not go above ~4.7 V, otherwise clipping will appear and you can damage the board***
+
+Below is a capture of an oscilloscope in which an approx. 2 V square wave (green, channel 2) is amplified to a 4 V square wave (yellow, channel 1) with the circuit shown below. The input signal was generated by a function generation (and shared GND was connected).
+
+![Oscilloscope measurements](./assets/amp_screenshot.png)
+
+But let's say you want to amplify the voltage signal 4x instead of 2x. The amplification of an OPAMP mainly depends on the chosen resistor values. Take a look at the formula below:
+
+![Calculate resistor value](./assets/calc.png)
+
+**Av** = Amplified Voltage (V)
+
+**R1** = Resistor connected to Ground (Ω)
+
+**R2** = Feedback resistor (Ω)
+
+We know we want to amplify the voltage times four so:
+
+**Av** = 4 V
+
+Now, we need to figure out what resistors to choose. Because we only can solve for one unknown value we choose a predefined value for one of the resistors, e.g. 10k Ω for R1.
+
+**R1** = 10k Ω
+
+Your formula should now look like this:
+
+![Add values to the formula](./assets/numCalc.png)
+
+ That leaves R2 as the only unknown variable. Now, Subtract one from both sides and multiply by ten, which leaves us with:
+
+**R2 = 30k Ω**
+
+## Circuit
+
+![Voltage 2x Amplifier Circuit](./assets/circuitAmplifierMinima.png)
+
+***Read more about an amplifier circuit [here](https://www.electronics-tutorials.ws/opamp/opamp_3.html).***
+
+## Code
+
+To start up the opamp, simply include the library and call `OPAMP.begin(speed)`. As the optional `speed` argument to this function, can choose either `OPAMP_SPEED_LOWSPEED` as the low-speed (lower power) mode or `OPAMP_SPEED_HIGHSPEED` as the high-speed, high-power mode.
+
+```arduino
+#include <OPAMP.h>
+
+void setup () {
+  OPAMP.begin(OPAMP_SPEED_HIGHSPEED);
+}
+
+void loop() {}
+
+```

content/hardware/02.hero/boards/uno-r4-wifi/tutorials/opamp/opamp.md

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+---
+title: 'Arduino UNO R4 WiFi OPAMP'
+description: 'Learn how to use the built-in Operational Amplifier in the UNO R4 WiFi'
+tags:
+  - OPAMP
+author: 'Maximilian Gerhardt, Hannes Siebeneicher'
+hardware:
+  - hardware/02.hero/boards/uno-r4-wifi
+software:
+  - web-editor
+  - ide-v1
+  - ide-v2
+---
+
+In this tutorial, you will learn how to use the built-in operational amplifier (OPAMP) featured on the [Arduino UNO R4 WiFi](https://store.arduino.cc/products/uno-r4-wifi). Operational amplifiers are very versatile and can be used to e.g. mirror an electrical signal or amplify it. 
+
+## Goals
+
+In this article, you will learn:
+- about the OPAMP feature onboard the UNO R4 WiFi,
+- about the basics of the OPAMP library, 
+- how to mirror a voltage signal,
+- how to amplify a voltage signal.
+
+## Hardware & Software Needed
+  To follow along with this article, you will need the following hardware: 
+
+  - [Arduino UNO R4 WiFi](https://store.arduino.cc/uno-r4-wifi)
+  - resistors
+  - Jumper wires
+
+
+## Operational Amplifier (OPAMP)
+
+An OPAMP is a versatile and widely used electronic component that belongs to the class of analog integrated circuits. Its primary function is to amplify voltage signals but they are very versatile and can be used to:
+
+- mirror an input voltage to its output,
+- amplify a small analog voltage to its output pin, output voltage range from 0 to ~4.7 V,
+- compare two input voltages and give a binary "higher" or "lower" output,
+- integrate and differentiate signals.
+
+## Voltage Follower
+
+The simplest way to test the OPAMP is to configure it as a voltage follower by connecting A2 to A3. In this setup, the voltage at A3 should mimic the voltage applied to A1. For instance, if you connect A1 to the ground (GND), the OPAMP output at A3 should also be at the ground potential. Similarly, if you connect A1 to 3.3 V, the output at A3 should be approximately 3.3 V.
+
+## Circuit
+
+![Voltage Follower Circuit](./assets/circuitFollowerWiFi.png)
+
+## Voltage Amplifier
+
+***Do NOT amplify the voltage provided by a battery as this can pose serious safety risks!***
+
+A voltage amplifier, as the name suggests, amplifies the voltage. A simple 2x amplifier can be built using e.g. two `10k` resistors. Connect one resistor between "minus" and GND. Then use the second resistor to connect the output and "minus" together. Any signal input at "plus" will now appear with double the amplitude at the output pin. Of course, the input signal and the Arduino board should share the same `GND`.
+
+***The amplified output signal should not go above ~4.7 V, otherwise clipping will appear and you can damage the board***
+
+Below is a capture of an oscilloscope in which an approx. 2 V square wave (green, channel 2) is amplified to a 4 V square wave (yellow, channel 1) with the circuit shown below. The input signal was generated by a function generation (and shared GND was connected).
+
+![Oscilloscope measurements](./assets/amp_screenshot.png)
+
+But let's say you want to amplify the voltage signal 4x instead of 2x. The amplification of an OPAMP mainly depends on the chosen resistor values. Take a look at the formula below:
+
+![Calculate resistor value](./assets/calc.png)
+
+**Av** = Amplified Voltage (V)
+
+**R1** = Resistor connected to Ground (Ω)
+
+**R2** = Feedback resistor (Ω)
+
+We know we want to amplify the voltage times four so:
+
+**Av** = 4 V
+
+Now, we need to figure out what resistors to choose. Because we only can solve for one unknown value we choose a predefined value for one of the resistors, e.g. 10k Ω for R1.
+
+**R1** = 10k Ω
+
+Your formula should now look like this:
+
+![Add values to the formula](./assets/numCalc.png)
+
+ That leaves R2 as the only unknown variable. Now, Subtract one from both sides and multiply by ten, which leaves us with:
+
+**R2 = 30k Ω**
+
+## Circuit
+
+![Voltage 2x Amplifier Circuit](./assets/circuitAmplifierWiFi.png)
+
+***Read more about an amplifier circuit [here](https://www.electronics-tutorials.ws/opamp/opamp_3.html).***
+
+## Code
+
+To start up the opamp, simply include the library and call `OPAMP.begin(speed)`. As the optional `speed` argument to this function, can choose either `OPAMP_SPEED_LOWSPEED` as the low-speed (lower power) mode or `OPAMP_SPEED_HIGHSPEED` as the high-speed, high-power mode.
+
+```arduino
+#include <OPAMP.h>
+
+void setup () {
+  OPAMP.begin(OPAMP_SPEED_HIGHSPEED);
+}
+
+void loop() {}
+
+```