The PCB we have made is big and has plenty of space for cutting and adding other bits and pieces. But if we want the final satisfaction of seeing it working, mounting the lot on a real bike, it is a bit too big. Way back in chapter one, we discussed sensors and I recommended we should stay with the herd and use some sort of hall device. Well now w
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e physically need one to get our hands on. I realise that it is almost impossible to buy a potted sensor +cable as a spare, they all come with a bike computer. Now we could buy a complete bike computer kit and throw the computer away. Or keep it for later as a spare. So we have results similar to the diagram. Similar means there is a measurable resistance change when the magnet is passed over and CLOSE to, he sensor body. How can we check I connected my multimeter on the mA scale across the end of the sensor wire in the handle bar mount shoe ( place where it enters the computer). The reading is of course zero mA. Next I took one of those little kitchen fridge magnets and waved it very close ( 1mm) to the Unknown type ” of sensor. I had to find the best direction to move the magnet over the sensor, but eventually I got a reading of a about 50 uA Well I cheated as I knew it was a coil sensor, but if it hadn`t been a coil sensor, instead some sort of HALL device, then we would have no change at all when the magnet was passed across the sensor body. In that case we would need to condition the pulse output. For those interested, basically a limiting amplifier to ensure that even at the slowest speeds there is enough signal for the PIC to detect at the PORTB input. But this could be tricky, without an oscilloscope, so unless you really have set your heart on making it work, best look for a HALL device type sensor. No panic about...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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