Le 22 août 2016, 11:19 dans Humeurs • 0
Bicycle with LIDAR
Summer, for bicycle lovers, nothing beats the winding road Sahuan children laps, more people feel comfortable a pleasant. But the road from time to time to jump out of the vehicle it is very hard to detect, no matter how frequently you observe the rearview mirror, even subconsciously always back squint, but it will still be "swishing" exceed scared is not a laser 3000mw car.Summer, for bicycle lovers, nothing beats the winding road Sahuan children laps, more people feel comfortable a pleasant. But the road from time to time to jump out of the vehicle it is very hard to detect, no matter how frequently you observe the rearview mirror, even subconsciously always back squint, but it will still be "swishing" exceed scared is not a light car.
In fact, the ideal is to install a laser 5000mw radar (commonly known as "lidar", and it works the same as ordinary radar, but the system emits a laser, not a conventional radio waves), its range fully meet the requirements, but the price is it is ridiculously expensive, on the bike, it is inevitable that some "overkill."However, a start-up company from Oregon Bender's PulsedLight, introduced a simplified version of the laser radar products --Lidar-lite, like a "timely" to solve the security problem Paul and I have been worried. This relies on crowdfunding launch laser radar detectors, although less than half the size of a deck of cards, but a range of up to 40m, detection accuracy is within ± 2.5cm range, all for only $ 89.
Receive the package the first time, Paul can not wait to fiddle opened up. But a little "wonderful" is that this lidar four signal lines are all wrapped in black jacket, the subsequent operation is very unfavorable, so Paul in the first line of each affix different labels, in order to facilitate the distinction. Here we also need to purchase a microprocessor containing Arduino board and connected 30000mw laser pointer radar, finally connecting the circuit board PC via a USB cable, driver software provided by the official line operation, the system is able to adjust to normal work can be. Finally, Paul will contain a four alphanumeric display board access Arduino, a simple programmed, a compact and lightweight rear warning system even if "done" the.
The next most important thing is, you have a whole in the rear of the car can be placed lidar small frame, but also to ensure high speed and severe jarring will not "disintegration." Although this is not an easy job, but PulsedLight engineers in addition to the official website released the operating manual, data sheets and simple Arduino program instructions for reference, but also provides a protective shell production parameters of laser radar 3-D model. Paul raw data Openscad the model was appropriately modified and made by 3D printer.
In addition to the 20000mw laser pen radar placed within a housing, a microprocessor, there is a 6mm thick foam lining, it can play the role of shock protection device. Another point to note is that the entire system is fixed to the car, should the laser radar lens slightly tilted a few degrees to the left, in order to prevent long-range laser transmission bifurcation, to monitor the impact on the rear of the car.Finally, three DC inverter Paul chose to shunt and AA batteries replaced two batteries contain a rechargeable lithium battery, the maximum output voltage of 7.4V, by 7805 the regulator output voltage can be reduced to 5V, meet the job requirements throughout the lidar system. Although he abandoned the body more tiny, more efficient AA batteries, but this performance and a pair of AA lithium batteries is almost the same. So, headache supply problem finally solved it!
PulsedLight offering a simplified version of the 10000mw blue laser radar and an Arduino microprocessor has good compatibility, the use of lithium batteries to power for the entire system. Additional LED display mounted at the handlebar, the rider can clearly inform, to the rear of the car away.After that in the end the effort to build this Paul car warning system in the end tube regardless of use? In fact, there to be test of time. Paul told me that when he properly debug the system, see LED display at the handlebar display the signal at the rear 35m have a car approaching, because too excited, even forget the car moved to the roadside. In addition, he is also preparing to re-create a protective shell, you can easily adjust the angle of the laser emission, and have to pondering, how can be made without dismantling the entire system case, can easily to charge the lithium battery.
After several days of experience, Paul found 2000mw green laser radar range to be smaller than expected, especially in poor sight curve, probe the effect is not ideal. He also said that the system is very easy to send out false alarms, and in order to reduce the false alarm rate, the speed will only decrease. Although there are many shortcomings to be excavated, but this simplified version of the laser radar has actually regarded as a good cost-effective traffic safety product. Of course, we should face a more complex road conditions, advise you still can not rely too much on the radar judgment. At this time, the muscles taut, erect ears, see the machine to hide is the best policy.