| Author | Message | ||
     Towpro |
after riding a BMW that had auto cancel turn signals for years, I still can't seem to remember to turn off my Uly (or my XR) turn signals. I want to build a circuit using a piezo buzzer to remind me. I realize I can use the positive off the turn signal indicator in the dash (piezo is 10ma current), but I want to get negative feed off the brake wire so the piezo does not sound when the brakes and turn signals are both on. I know how to use diodes to stop feed back, BUT my question is: Since the rear stop light is LED, and I assume it is switched positive, will I still get a feed back ground through the LED's when the positive is not applied through the brake switch? | ||
| Buellerxt |
I understand your desire, Towpro, but it's just another example of how we are all different. I have ridden Harley's for years, with their self canceling signals, and I LOVE the switch to the non-canceling signals on the Uly. Maybe BMW's have better signals than Harley's but the signals on my Harley's can't be trusted. They often cancel before I've turned, without me knowing it because I am in the middle of a busy intersection and preoccupied with watching out for my life. I don't know if they turn off because of a little jut before the turn, slight handlebar movement, time, or what, but it puts me in danger because oncoming cars don't know my intention. With the Uly they stay on and I am confident that they will be on and give other drivers the correct information. Very cool! I have also gotten very good at turning them off right after a turn. It took a little while but I focused on it a bit and am good now. I really like the Uly signals but I understand your desire. | ||
| 7873jake |
I like the fact that they don't self cancel as well but wanted a reminder because I've caught myself a half a block later (or 2) blinking away, throwing head fakes in traffic. Just haven't figured out how to do it yet either. Towpro, you have my undivided attention. I'm watching this one with anticipation. | ||
| Garrcano |
Use for example a 2K6 ohm resistor between +12 VDC and the positive connection of the piezzo buzzer. Then a NC contact from a mini relay, parallel to the resistor (one pin of the NC contact to +12 VDC and the other pin to the positive of the buzzer). The coil of the relay gets positive from the brake and negative from ground. When the brake light lits the contact open and the buzzer gets power through the resistor (low sound). With no brake the contact stays closed and the buzzer gets full power (high sound). | ||
| Garrcano |
I´ve used the relay with coil connected to +12 VDC and to neutral signal (ground switched). Pin 3 (TN/Y) on display connector IIRC. | ||
| Towpro |
Here is a start http://www.rattlebars.com/mtz/buzzer.html I am thinking about something like the 5th drawing down (mid page on the Right. Only instead of Ground, I was hoping to use feedback through the brake light circuit. That way when I apply the brakes (wire goes positive) the piezo will not buzz. (the ground side is shown in the Upper RS drawing) | ||
| Sparky |
I would rather install a super bright light tied into the dashboard indicator & aimed at my face than have a buzzer sounding like a trash truck about to back up, but that's just me.  | ||
| Towpro |
I thought about that, but I think the indicator in the dash is an LED soldered into the circuit board. I forgot to check when I put in my voltage indicator light (thanks for the write up FtBstd) | ||
| Ronmold |
The only stock dash LED is the low fuel light, the rest are replaceable, which I've done w/ LED. Your idea gave me a thought of using a super-bright LED in the indicator hole and running it dim while the brake lights are on and a few seconds afterward, then going to full-on mode. What cancels a Harley turn-signal? | ||
| Towpro |
The purple wire on the flasher is the "flash feed" to the turn signals The wire from the front brake switch is not grounded when turned off. I will need to use the relay method like Garrcano defined, only I will wire it so the buzzer positive goes to the purple "flash feed" wire. Then the ground will go through the relay so I have no buzz when brakes are applied. Now since I am in the headlight screen, I need to dig up that drawing with HID's. | ||
| Reepicheep |
It would be pretty easy to use a pic microcontroller to count the "blinks" it sees, and start beeping or something after a preset number of consecutive blinks have happened *after* the brake light is released. Maybe $10 in hardware. Hmmm... think they would sell? | ||
| Ronmold |
I engage the turn signal way before I apply brakes, I wouldn't want the beep then. You only want the beep after the signal's on and the brakes are released I believe. I'll work on a circuit tonight, give me a day or so, I want one too. | ||
| Reepicheep |
Use a microcontroller and it can be really smart... Here is the sequential finite state machine... 1) Does nothing until it sees 4 blinks. 2) After four blinks, it waits until it sees a brake light. 3) After it sees the brake light, it does nothing until the brake light goes off. 4) It counts blinks. If it hits 30 (30 seconds) it starts buzzing. 5) If the brake light comes on at any time, it returns step 4 setting the blinks to zero. It would be easier to build then wire in. Use a PIC 16F819 and the discrete ports and the internal clock. Maybe 10 parts, and thats only if you go legit on the voltage regulator and put in the filter caps (which from what I have seen of pic's so far does not appear necessary, but I am too chicken to remove them). | ||
| Paralegalpete |
Can't help you with your electrical, but I had the same issue for weeks after trading my Harley for a Buell. I've programmed myself to press the cancel button after every intersection, even straights. | ||
| Tootal |
I switch off between a Harley and the Buell. The Harley now get one push for on and another push for off. The only problem is if the Harley shuts them off before I do, then I'm tuning them back on! Sometimes you just can't win! I'm getting pretty good at switching bikes now. It's a lot easier than switching from my Yamaha dirt bike to the BSA 441 Victor with it's left foot brake and right foot shift!! I actually got good at that one. The sound of the engines must have switched something in my brain.  | ||
| Alchemy |
I would look at this differently. Why not use a game sensor motion detector (inertial maybe). When the turn signal is initiated the senor waits for a 30 degree change in direction and then waits 5 more seconds and cancel the signal with an audible beep of confirmation or a recurring beep if the turn does not happen. Motorcycles are an interesting challenge given the fascinating mechanics of their methods of turning that vary with speed, presence of a side-car etc. | ||
| Satori |
Towpro I just ran across this, looking for a brake light modulator. Maybe this will work? not cheap, but looks simple enough. https://www.kisantech.com/view_product.php?product =SM-1 |
