You can also use any electronic rolling shutter with manual shutter speed - e.g. an Android phone with Camera2 API support and any of several camera apps with f

You can also use any electronic rolling shutter with manual shutter speed - e.g. an Android phone with Camera2 API support and any of several camera apps with full manual settings. Set the shutter speed fairly high and preview or photograph the light source; flicker appears as scanlines, e.g. https://i.imgur.com/6kSoSfX.jpg https://i.imgur.com/6kSoSfX.jpg.