In order to accomplish this my initial thought is to sample an input (ADC) at consistant time increments and then display the waveform on a graphic lcd display. If I want to change the time scale I can just change the rate of time between samples, and if I want to increase the voltage scale I can scale the measured values by some multiple. With that basic concept, this project will require an
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ADC, microcontroller, graphic lcd, and some form of input. After doing a bit of search for the LCD display this link was selling a 4 inch display with touch screen for a mere $25 (which is dirt cheap for that type of resolution if you check sparkfun or other website). So now I had the display and the input source, though more thought will be needed to have graphical interface, the next item to tackle was the ADC. I had a few 24bit Microchip microcontrollers that had onboard ADC that could sample at 1. 1 Msps, as they were designed to be optimized for digital signals. Not only that but they can sample multiple channels at one time which would be good for a two channel oscilliscope (if I decide to upgrade later on). The chip is a dsPIC33FJ128GP802, and it also has the capability to do sampling in the background while filling up an onboard DMA so that the only work in code will be to draw the display, plot the data, and handle inputs. The dsPIC33 is a 16 bit processor as opposed to the 8 bit processors which makes math on larger values much easier and quicker. On that same note, it also can run up to 40 MIPS so there should be plenty of speed if math operation may be needed to do an FFT or other analysis of data. Initially in testing I was interfacing the touch screen with an onboard ADC of the microcontroller, but after thinking about how that ties up a resource I decided to go with a dedicated touch screen controller the...
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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