Dynamic indication support for nanoFraework on ESP32

Hardware

Dynamic indication is a sequential output of data to some of the indicators for a certain period of time, then output to the next group. The circuit may be as follows:

Or it can be supplemented by a decoder (like 74141) to reduce the number of data lines.

Workflow

For example, in this project NIXIE clock, 6 indicator lamps IN-14 are used, combined in 2 groups. Groups work in parallel. Each group is connected to its own decoder 155ID1 (74141). Thus, there are 4 * 2 = 8 data lines and 3 selection lines.

All of this lones connected to ESP32 second board.

Data pins:

Group 1

• IO27
• IO26
• IO25
• IO33

Group 2

• IO32
• IO5
• IO18
• IO19

Control

• IO13
• IO2
• IO14

Example

using nanoFramework.Hardware.Esp32.DynamicIndication;

// create DynamicIndication controller
Controller c = new Controller(
    new int[] {	27, 26, 25, 33, 32, 5, 18, 19 }, // data bus pins
    new int[] {	13, 2, 14 }, // control bus pins
    4 // Data bits pre one indicator group 74141 input data bits count
);

// setup period for group switching 5ms for me is ok (no flicker)
c.UpdatePeriod_us = 5000;
// Start controller to display data on indicators
c.Enabled = true;
// setup raw data array, 1 element for 1 indicator
// it displays "01 23 45" for mac schematic
c.SetData(new uint[] { 3, 2, 4, 1, 8, 13 });

// C# process delay, indicators is working
c.Sleep(5000);
// disable indication. All indicators are shut down
c.Enabled = false;
// dispose controller. All used pins are released and resets to default state
c.Dispose();

Build

1. Clone repository into any dirrectory

git clone https://github.com/ololoshka2871/nanoFramework.Hardware.Esp32.DynamicIndication.git

2. Setup nf-interpreter build environment. Manual.

3. Copy file Native/FindINTEROP-nanoFramework.Hardware.Esp32.DynamicIndication.cmake.template to nf-interpreter\CMake\Modules\FindINTEROP-nanoFramework.Hardware.Esp32.DynamicIndication.cmake

4. Edit file nf-interpreter\CMake\Modules\FindINTEROP-nanoFramework.Hardware.Esp32.DynamicIndication.cmake Replace ${PROJECT_SOURCE_DIR}/<PATH_TO_YOUR nanoFramework.Hardware.Esp32.DynamicIndication/Native folder> to path to cloned repository.

5. Add string "NF_INTEROP_ASSEMBLIES" : [ "nanoFramework.Hardware.Esp32.DynamicIndication" ] to in file cmake-variants.json in nf-interpreter folder

6. Build and flash nf-interpreter into ESP32

7. Add reference to nanoFramework.Hardware.Esp32.DynamicIndication library into your C# project.

8. Build and deploy application into ESP32

9. Enjoy!