I enjoy cycling regularly whether it is to get around town, commuting, for leisure or for fitness. Occasionally I think about combining this with a microcontroller such as the Arduino Nano or a Raspberry PI. The obvious place to go with this theme is a bike 'speedometer' and GPS. I'm sure this would be a fun exercise and opens up lots of possibilities for taking the concept beyond what is provided commercially. * Speedo/GPS A magnetic hall effect sensor can be bought for under a pound and would allow us to read wheel rotation speed and crank revolutions - so cadence. A relatively cheap GPS is available which can be connected over the serial lines - RX/TX. In this case I'd try the Neo 6M - which I have seen for £7-9. A small 2-3" OLED display or 16x2 Hitachi LCD could be used for up-front information on the cockpit. Or LEDs and vibration motors could provide an alternative form of feedback. Here is my version of a speedo with audio feedback on every rotation of the wheel and a pulsing LED.

More #Arduino and electronics bike speedo and led pulse to speed

A video posted by Alex Ellis (@alexellis2) on Sep 6, 2015 at 11:54am PDT

* LED strip lighting I suspect this may violate some regional or local bi-laws or restrictions so best look into this idea before going for a test ride. Adhesive and waterproof LED strip-lighting can be bought relatively cheaply from the far east. It could be wrapped around the top tube, down tube, rear stays or even the seat tube - maybe all of them at once. The drawback is that the cheaper LED strips run at 12V and can draw a fair amount of current meaning you may need to carry a high current battery on your bike. * Sonar for safety A HC-SR04 ultrasonic sensor can be bought for £1-2 and will give a measurement and reading between around 2cm and 250cm. The concept would be to mount the sensor either side facing or rear facing. A rear facing range-finder provides a warning about cars coming up behind you about to overtake or riding too close. The low tech alternative would be a wing mirror.

#cycling sensor to warn rider of close vehicles #arduino #iot #sensors

A video posted by Alex Ellis (@alexellis2) on Sep 6, 2015 at 8:32am PDT

I attached this version to my bike and went for a test ride - a van approached behind me and followed me for 200ft but the sensor did not go off. This made me think that the 2.5m range is not enough especially if on a country lane or noisy road. The side facing version is not going to provide the same advance warning of an overtake but could be useful in conjunction with a camera for capturing dangerous manoeuvres. Do you have any other ideas? Let me know in the comments.

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