https://github.com/coderarjob/signal.echo

Demo board which generates sample signals experimenting/checking oscilloscope features
https://github.com/coderarjob/signal.echo

c demo-board electronics kicad oscilloscope signal-generator ziglang

Last synced: 10 months ago
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Demo board which generates sample signals experimenting/checking oscilloscope features

• Host: GitHub
• URL: https://github.com/coderarjob/signal.echo
• Owner: coderarjob
• License: other
• Created: 2025-05-30T19:39:23.000Z (about 1 year ago)
• Default Branch: master
• Last Pushed: 2025-09-02T20:25:18.000Z (10 months ago)
• Last Synced: 2025-09-02T22:18:01.659Z (10 months ago)
• Topics: c, demo-board, electronics, kicad, oscilloscope, signal-generator, ziglang
• Language: C
• Homepage:
• Size: 13.5 MB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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## About

This is a hardware project based on Atmega8A microcontroller. This project came about from a

personal need for a demo board to test my new oscilloscope. I plan to create a complete PCB

along with firmware in this repo.

### Screenshots

##### 1. Serial RS232 (TTL Level) decoding test

![rs232](docs/images/usart.png)

##### 2. Serial I2C decoding test

![rs232](docs/images/i2c.png)

##### 3. Positive & negative Runt detection pulse

![Positive runt pulse](docs/images/positive_runt.png)

![Negative runt pulse](docs/images/negative_runt.png)

##### 4. Burst mode pulses

![Negative runt pulse](docs/images/burst_pulses.png)

##### 5. Sine wave

![Sine wave](docs/images/sine_wave.png)

![Sine wave](docs/images/sine_wave_freq_dist.png)

![Sine wave](docs/images/sine_wave_fft.png)

##### 5. Amplitude Modulation wave

![Sine wave](docs/images/am_wave.png)

![Sine wave](docs/images/am_wave_fft.png)

##### 6. Triangle wave

![Triangle wave](docs/images/triangle_wave.png)

![Triangle wave](docs/images/triangle_wave_freq_dist.png)

![Triangle wave](docs/images/triangle_wave_fft.png)

##### 7. Sawtooth wave

![Sawtooth wave](docs/images/sawtooth_wave.png)

![Sawtooth wave](docs/images/sawtooth_wave_freq_dist.png)

![Sawtooth wave](docs/images/sawtooth_wave_fft.png)

### Goals

- [X] Firmware: RS232 sample output (positive)

- [X] Firmware: I2C sample output

- [X] Firmware: Runt pulse (+ve & -ve runt pulses)

- [X] Firmware: Sine wave pattern

- [X] Firmware: Amplitude Modulation wave pattern

- [X] Firmware: Triangle wave pattern

- [X] Firmware: Sawtooth wave pattern

- [X] Firmware: Burst data in two lines

- [X] Firmware: Separate arch independent codes

- [X] Unittests: Add unittests for utils

- [X] Unittests: Add unittests for existing tests

## Building prerequisites

1. Requires Linux environment for building.

2. GNU Make

3. avr-gcc

4. avr-libc

### Firmware

```

BUILD_DIR=out make

```

Firmware is the `./out/firmware.hex` file. To program micro with avrdude, we can do `make program`.

### Unittests

We can build every unittests and run them using the `run` target.

```

BUILD=ut BUILD_DIR=out/ut make run

```

### Tools

Some tools which are used exclusively in this project are/will be put into the `tools` folder. Each

may have different prerequisites and build procedures. For information see `Readme.md` of each

tool.

# Feedback

Open a GitHub issue or drop a email at arjobmukherjee@gmail.com. I would love to hear your

suggestions and feedbacks.