Post by thread:[EE]: Accelerometer brakelight (was Modulating a h

All this talk of increasing visibility has suddenly become of more interest to me, given that I'm recovering from an argument with a Land Rover which turned across my path (Oh, I didn't see you) in traffic. Turns out that my motorcyle and I weigh a lot less than a Land Rover. Only a mind hand fracture, thanks to a good helmet, good jacket, leather pants etc... Getting to the point, though, I'll be looking into a headlight modulator, evidently having your highbeams on during the day doesn't cut it with Italian drivers - I don't know if they're legal in Italy but I think I'd rather risk the ticket from the usually absent local police than another encounter with a Land Rover. Ironically, I had already modified my bike to make me more visible from behind - I built a brakelight which activates a row of high intensity LEDs - more LEDs for heavier deceleration. I've always thought that this was important on a motorbike, as you can be decelerating quite heavily from engine braking alone before you touch the brakes. Using an accelerometer, the drivers behind get a warning before your main brake light comes on. I used a PIC, naturally, a 12C series reading the digital output of an Analog Devices surface mount accelerometer and controlling the lights. I'd be interested in knowing if anyone else has done a similar project. Keep the rubber side down, Evan. ==========<O>========== Evan Short Ingegnere Elettronico - FERRARI S.p.A. GES v. Ascari 55/57 41053 Maranello (MO) ITALY Tel. +39 (0536) 949.616 FAX +39 (0536) 949.377 spam_OUTeshortTakeThisOuTferrari.it -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Hi Evan, I have done a performance measuring meter using the same accelerometers. I assume you use the ADXL202. I used the two CCP inputs to get the two axis readings. I'm working on a version for motorbikes as well. You can see the meters in the products section at http://www.race-technology.com Email me off list if you would like any further information. Martin >>> .....eshortKILLspam@spam@FERRARI.IT 07/03/01 09:44AM >>> All this talk of increasing visibility has suddenly become of more interest to me, given that I'm recovering from an argument with a Land Rover which turned across my path (Oh, I didn't see you) in traffic. Turns out that my motorcyle and I weigh a lot less than a Land Rover. Only a mind hand fracture, thanks to a good helmet, good jacket, leather pants etc... Getting to the point, though, I'll be looking into a headlight modulator, evidently having your highbeams on during the day doesn't cut it with Italian drivers - I don't know if they're legal in Italy but I think I'd rather risk the ticket from the usually absent local police than another encounter with a Land Rover. Ironically, I had already modified my bike to make me more visible from behind - I built a brakelight which activates a row of high intensity LEDs - more LEDs for heavier deceleration. I've always thought that this was important on a motorbike, as you can be decelerating quite heavily from engine braking alone before you touch the brakes. Using an accelerometer, the drivers behind get a warning before your main brake light comes on. I used a PIC, naturally, a 12C series reading the digital output of an Analog Devices surface mount accelerometer and controlling the lights. I'd be interested in knowing if anyone else has done a similar project. Keep the rubber side down, Evan. ==========<O>========== Evan Short Ingegnere Elettronico - FERRARI S.p.A. GES v. Ascari 55/57 41053 Maranello (MO) ITALY Tel. +39 (0536) 949.616 FAX +39 (0536) 949.377 eshortKILLspamferrari.it -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

>to me, given that I'm recovering from an argument with a Land Rover which >turned across my path (Oh, I didn't see you) in traffic. Turns out that my hihihi >engine braking alone before you touch the brakes. Using an accelerometer, >the drivers behind get a warning before your main brake light comes on. I >used a PIC, naturally, a 12C series reading the digital output of an Analog >Devices surface mount accelerometer and controlling the lights. >I'd be interested in knowing if anyone else has done a similar project. Interesting, I'd like to take a look on it.. >Ingegnere Elettronico - FERRARI S.p.A. GES WHAT???? You work on Ferrari and has a MOTORBIKE???? NAAAAAAAAAAHHHHHHH!!! :~( ---8<---Corte aqui---8<---- Alexandre Souza .....taitoKILLspam.....terra.com.br http://planeta.terra.com.br/lazer/pinball/ ---8<---Corte aqui---8<---- -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

That is a really good point about breaking without the breaks and if I were still... err... young enough? to ride, I would be begging for your design so I could build one and were I not an embedded engineer, I would want to buy one. You should consider producing and selling that unit. One other comment, for any young riders, based on personal experience: What Evan says about good helmet and leather can not be overstressed. Denim, cotton, etc... are like tissue paper when they rub on the road. Leather can prevent road rash. Wearing a car instead of riding a bike can prevent lots of other injuries. James Newton, PICList Admin #3 EraseMEjamesnewtonspam_OUTTakeThisOuTpiclist.com 1-619-652-0593 phone http://www.piclist.com {Original Message removed}

----- Original Message ----- From: Short, Evan <eshortspam_OUTFERRARI.IT> Subject: [EE]: Accelerometer brakelight (was Modulating a headlight) > Ironically, I had already modified my bike to make me more visible from > behind - I built a brakelight which activates a row of high intensity LEDs - > more LEDs for heavier deceleration. I've always thought that this was > important on a motorbike, as you can be decelerating quite heavily from > engine braking alone before you touch the brakes. Using an accelerometer, > the drivers behind get a warning before your main brake light comes on. I > used a PIC, naturally, a 12C series reading the digital output of an Analog > Devices surface mount accelerometer and controlling the lights. > I'd be interested in knowing if anyone else has done a similar project. An old classmate of mine built such a similar product, but rather than show you the acceleration it flashed. He didn't say what was involved in designing it. I haven't heard from him since last December though. Jeff -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

Hi Jeff, I have not completed the Harley high intensity LED project yet. I'd sure like to exchange emails with you offline from PIClistserv. Your project seems light years ahead (no pun intended :-) than mine. I would like to build one similiar for this guy as he uses it as a family/weekend cruiser like so many others. What about the severe vibration, is the accelerometer portion immune to this? Regards, Mike at KILLspamke6cvhKILLspamthe-i.net {Original Message removed}

Hi, I know a certified mechanic who once told me that they used a regular tun signal flasher module on 3rd brakelights to flash them for the fleet of vehicles belonging to the city and were being maintained at his garage. I would like to build this circuit that you described with the Analog devices surface mount accelerometer. My first concern is the vibration of the Harley setting it off. Do you think the vibration would be an issue? I saw some 20,000mCd LED's on ebay but they wanted 2.99 each. Regards, Mike {Original Message removed}