kopia lustrzana https://github.com/fhdm-dev/scoppy
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fhdm-dev
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6ca9cd9e0e
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@ -11,7 +11,7 @@ The aim of the Scoppy project is to give electronics novices and hobbyists acces
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* A Rasperry Pi Pico board
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> Important
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> Please use the latest versions of the App (v1.016) and Firmware (v8). Older versions of the firmware may not work with the latest version of the app and vice versa
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> Please use the latest versions of the App (v1.017) and Firmware (v9). Older versions of the firmware may not work with the latest version of the app and vice versa
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## Quick Start
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@ -21,7 +21,7 @@ Install the [Scoppy Android app](https://play.google.com/store/apps/details?id=x
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### 2. Install the firmware onto your Pico
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Download the firmware onto your computer. It is here: [pico-scoppy-v8.uf2](https://fhdm-dev.github.io/downloads/scoppy-pico-v8.uf2). Alternatively you can [build the uf2 file](https://github.com/fhdm-dev/scoppy-pico) from the sources.
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Download the firmware onto your computer. It is here: [pico-scoppy-v9.uf2](https://fhdm-dev.github.io/downloads/scoppy-pico-v9.uf2). Alternatively you can [build the uf2 file](https://github.com/fhdm-dev/scoppy-pico) from the sources.
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Press the bootsel button on your Pico and connect it to your computer. Copy the uf2 file onto your Pico. The onboard LED should start blinking.
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@ -60,5 +60,6 @@ exclude:
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#
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# - index.md
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# - none.markdown
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# If this points to a real page an Index link is inserted at the top of each page
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header_pages:
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- TOC.md
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- none.md
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@ -3,14 +3,29 @@ title: Signal Generator
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---
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Scoppy includes a very basic (PWM) signal generator. This is accessed by tapping the SIGNAL GENERATOR
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button on the menu panel.
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button on the menu panel. The signal is ouput on GPIO 22.
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You can choose from a 50% duty cycle square wave at various frequencies and a PWM encoded sine wave.
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Using a low pass filter the PWM encoded sine wave can
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be used to generate an analog signal.
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When the Pico is powered on the signal defaults to a 1kHz square wave.
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### Signal Type
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#### Square Wave
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Generates a square wave between 100Hz and 1.25MHz with a 50% duty cycle.
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#### Sine Wave (PWM)
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Generates a square wave where the duty cycle changes according to the sine function. The frequency
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of the sine wave is 1kHz.
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This PWM signal can be converted to a sine wave by the addition of a low pass filter.
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A filter using a 1k resistor and 0.1uF capacitor should work.
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See this [All About Circuits](https://www.allaboutcircuits.com/technical-articles/low-pass-filter-a-pwm-signal-into-an-analog-voltage/) article for more information.
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#### None
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Turns off signal generation.
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<br>
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[App Help](.)
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[All Documentation](../TOC)
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[All Documentation](../)
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[Scoppy on GitHub](https://github.com/fhdm-dev/scoppy)
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@ -0,0 +1,48 @@
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---
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title: XY Mode
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---
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The XY display plots the values of CH1 against CH2. This is different to the normal (YT) mode where voltage is plotted as a
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function of time. CH1 is used for the deviation along the X axis and CH2 for the Y axis.
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<br>
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### How to enable XY mode
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From the menu tap the Display button. Tap either:
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* XY to display just the XY plot
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* XY + YT to display the XY plot and the normal YT scope output
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To hide the XY display, tap the Display button and then select YT (Default)
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<br>
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### Channel Volts/Div and Position
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The Channel Volts/Div and Position settings can be used as normal in XY mode. Changing the values for
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CH1 will affect the scale and postion in the X direction. Changing the values for CH2 will affect the scale
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and position in the Y direction.
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Tip: To quickly set the Volts/Div or Position of a channel back to its default value, tap and hold the appropriate button.
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<br>
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### Horizontal Time/Div and Position
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Only the samples visible in YT display window are used to generate the XY plot. ie. The entire sample record is not used unless
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the Time/Div has been adjusted so that the traces visible on the YT screen include all sample points.
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This allows you to control which part of the sample record is used to generate the XY plot.
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A maximum of 1000 samples are displayed in the XY plot.
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<br>
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### Dots vs Lines
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The points in the XY plot can be displayed as either unconnected dots or as lines connecting adjacent (in time) values.
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<br>
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[App Help](.)
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[All Documentation](../TOC)
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[Scoppy on GitHub](https://github.com/fhdm-dev/scoppy)
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@ -15,6 +15,7 @@ title: App Help Index
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* [Channels - Logic Analyzer Mode](Channels-Logic-Analyzer)
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* [Measurements](Measurements)
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* [Cursors](Cursors)
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* [XY Mode](XY)
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* [Sample Rate - Auto vs Fixed](Sample-Rate)
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* [Signal Generator](Signal-Generator)
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* [Release Notes](../wiki/ReleaseNotes)
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@ -27,3 +27,5 @@ title: Scoppy
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* Experiments, tutorials and examples using Scoppy
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[Release Notes](./wiki/ReleaseNotes)
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[Scoppy on GitHub](https://github.com/fhdm-dev/scoppy)
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@ -7,7 +7,7 @@ title: Installation
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Install the [Scoppy Android app](https://play.google.com/store/apps/details?id=xyz.fhdm.scoppy) from the Play Store.
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### 2. Install the Firmware
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Download the [pico-scoppy-v8.uf2](https://fhdm-dev.github.io/downloads/scoppy-pico-v8.uf2) file to your computer.
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Download the [pico-scoppy-v9.uf2](https://fhdm-dev.github.io/downloads/scoppy-pico-v9.uf2) file to your computer.
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Alternatively you can [build the uf2 file](https://github.com/fhdm-dev/scoppy-pico) from the sources.
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Push and hold the BOOTSEL button on the Pico, then connect it to your computer using a micro USB cable. Release BOOTSEL once the drive RPI-RP2 appears on your computer. Copy the uf2 file to your Pico.
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@ -2,6 +2,24 @@
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title: Release Notes
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---
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### Android App v1.017 - Pico Firmware v9
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#### XY Mode
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To enable XY mode, tap Menu and then Display. The XY plot can be displayed on its own or together with the normal YT grid.
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#### Other improvements
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- In the signal generator screen you can now specify an exact frequency value. Tap the frequency dropdown menu
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and then tap Custom. Enter the frequency.
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- The app will now show a warning if you've set the Time/Div to a value that would cause the waveform to not be visible
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- Voltage ranges can be compiled in the firmware and uploaded to the app automatically. Useful if you use the same Android Device with different front ends.
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#### Bugs fixed
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- Y cursor info showing incorrect value
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- Not enough precision in trigger level dialog
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- Tapping Help in the on-screen measurements dialog would actually change the settings
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- App would sometimes crash when connecting/disconnecting the Pico
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- The disabled channel would be used for the horizontal cursor info
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### Android App v1.016 - Pico Firmware v8
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#### On-screen measurement configuration
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@ -0,0 +1,10 @@
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<!DOCTYPE html>
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<html>
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<head>
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<title>HTML Meta Tag</title>
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<meta http-equiv = "refresh" content = "0; url = https://oscilloscope.fhdm.xyz/app-help/Signal-Generator" />
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</head>
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<body>
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<p></p>
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</body>
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</html>
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@ -1,15 +0,0 @@
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---
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title: Signal Generator
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---
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### Square Wave
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Generates a square wave on GPIO 22. The frequency defaults to 1kHz.
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### Sine Wave (PWM)
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Generates a square wave on GPIO 22 where the duty cycle changes according to the sine function. The frequency
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of the sine wave is 1kHz.
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This PWM signal can be converted to a sine wave by the addition of a low pass filter.
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A filter using a 1k resistor and 0.1uF capacitor should work.
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See this [All About Circuits](https://www.allaboutcircuits.com/technical-articles/low-pass-filter-a-pwm-signal-into-an-analog-voltage/) article for more information.
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Ładowanie…
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