Below you can see the rest of the schematic integrated with the voltage regulator from my last post. As I explained previously, the PIC16F690 is the brains of my system. This PIC is a mid-range option for hobbyists and has much more functionality than I made use of in this project. I originally thought I would make better use of it when I was in t
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he planning stages but everyone who has been following me knows how things turned out. You can see in the schematic I left 15 of the 20 pins open, which is a colossal waste of space. A better controller to use would have been the ATTiny10 from Atmel or a 6 pin micro from Microchip. Even the 16F84 that I had lying around could have saved some space and provided the same functionality (flashing an LED). I was able to program the chip using an in-circuit configuration with a PICKit 2 and could have included programming headers in the design if I intended to reprogram these devices in the future. I have included another schematic of the in-circuit setup I used for the programming. You can substitute a small signal diode for the 47kohm resistor if that is handier for you. From what I can gather this setup is pretty standard across different families of microcontrollers and you can integrate this header into your printed circuit board design for on-the-fly reprogramming. You just have to make sure that the circuit isn`t operating while you are trying to program it and that no power is supplied to the programming pins when you do want to test the circuit. This is less of a problem if you don`t have anything else connected to pin RA3 (configuration specific). The software is brain dead simple and written in C using the MPLABX IDE from Microchip (GUI pictured below). All it does is call a delay function by passing an integer to...
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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