Blinkry na Babettu / Indicators on Babetta

thingiverse

Recently I acquired the iconic Czechoslovak moped, Babetta 210 from 1986. Due to age, the Babetta is not equipped with flashers (but they could be purchased in their time) and therefore I decided to add them. Models available on the market, however, did not fit well so I decided to make my own (I know that they do not have homologation, but because Babetta is not subject to registration, it's not such a problem). Now to the blinkers themselves. They are modeled to resemble the shapes of the original blinkers that were used at the time and with a view to easy printing without support. The main difference, however, is the absence of a hollow threaded rod by which the turn indicators then attached to the frame and instead the handles are already integrated. Another change is the use of LEDs instead of incandescent lamps, and of course the microprocessor control implemented by Arduino with the MCU AT Tiny85. The front and rear lights are identical in design and differ only in the shape of the body itself and the way it's mounted. Generally, however, each light consists of a printed lens which is to be made of a transparent non-colored material, as well as two sealing rings made of TPU, a mask into which the ice is placed, and finally the body itself. The ice is placed on a dedicated ring to which it is secured by a drop of instant glue. Subsequently, they are simply connected according to the attached drawing in the style of a sparrow's nest, see photo. The headlights are attached to the top of the spring shock absorbers by means of glue and fastening strips. In the case of rear lights, it is necessary to cut M4 threads into them and drill three holes 4 mm in diameter for each light (two for fixing screws and one for cable extension). However, for the turn signals to work, it is necessary to complete the Babetta with some ciclicovací circuit. Here you can use the universal 12V breaker (6V for older models). However, I decided to build my own with the AT TINY 85 microcontroller from the Atmosphere on the universal board. Here, it was urged to use Arduino for its cost and ease of programming, and hence possible later modifications. The wiring diagram is shown in the diagram above. By using the microcontroller, it was possible to use ordinary buttons instead of switches. As a result, the turn signals have the following functions: when the direction button is pressed, flashing for that direction is activated; press the same button again to stop flashing; it is, however, possible to switch directly to flashing in the opposite direction by pressing the opposite direction button; of course, flashing of any direction can also be stopped by pressing the STOP button. By pressing the STOP button, the so-called warning lights can also be switched on when all the turn signal lights do not light, when all the lights start flashing simultaneously. In order to operate the turn signals and especially the warning lights even without the engine running (for example in case of failure), the whole system is powered by a classic power bank, which is charged from the light circuit while driving. For this purpose, there is a wiring with a rectifier, a protective transil, a capacitor, and, in particular, a step-down module of the converter, see the diagram above. To test the functions, a SimulIDE file and binary are also added.