Plug-And-Play infrared sensor for high-speed ballistic chronographsDesigned by td0g in Canada
What is it? The LG0 Light Gate sensor is the open-source heart of a DIY ballistic chronograph. When paired with a series of IR emitter LED's, the sensor detects small fluctuations in the light (su...Read More…
The LG0 Light Gate sensor is the open-source heart of a DIY ballistic chronograph. When paired with a series of IR emitter LED's, the sensor detects small fluctuations in the light (such as when a bullet travelling faster than Mach 2 goes between the LED and the sensor) and transmits a simple signal.
While it is capable of detecting fast-moving projectiles, the LG0 can also be used as a sensor for water drop photography. It can connect directly to an Arduino, which will trigger a flash after a water drop has been detected.
Includes: One (1x) fully-assembled LG0 Light Gate sensor. You may choose to leave the photodiodes unsoldered, and they will come loose with the sensor.
I designed the original sensor for my home-built ballistic chronograph. Other DIY sensors were simply not fast enough to measure high-powered rifle bullets as they used photoresistors or phototransistors. My design used reverse-biased photodiodes which have a response time measured in nanoseconds!
This version was updated using KiCad with SMT components for simple assembly. It is used in my new Ballistic Chronograph MK2 which has been used to measure bullet speeds up to 875 m/s (2,800 fps / mach 2.5).
Yes! See my Ballistic Chronograph MK2 Assembly Manual.
I've received a small batch of sensors from the board house. Once stock runs out, I will order a second batch.
The schematic, PCB design, and other documentation are licensed under a Creative Commons Attribution 4.0 International License.
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