Two-Channel PC Based Oscilloscope USB

Since portable PCs are today common and a USB linkis a better solution here we present an oscilloscope using USB port of the PC that operates at upto 10 kHz with ±16V input voltage. Ithas much more improved features thanthe PC-based oscilloscope.The oscilloscopeuses IC PIC18F2550 from Microchipas the main controller, which makesthe oscilloscope
Two-Channel PC Based Oscilloscope USB - schematic

compact as there is noneed of additional power supply forthe entire circuit board. At the heart of this oscilloscope is USB2. 0-compliant microcontroller PIC18F2550 from Microchip. You can also use IC18F2445 in place of PIC18F2550. Specifications of this microcontroller are:- avobe figrue shows the circuit of the two-channel PC-based oscilloscope. MCP6S91 from Microchip Technology is an analogue programmable gain amplifier that is well suited to driving analogue-to-digital converters (ADCs) and an analogue input to a PIC microcontroller. Two MCP6S91 programmable gain amplifiers (IC4 and IC5) make it possible to choose the input ranges for each of the two channels, by selecting a gain from 1:1 to 32:1. The amplifiers are small, cheap and easy to use. A simple three-wire serial peripheral interface (SPI) allows the PIC to control them through pins 5, 6 and 7. The MCP6S91 amplifier is designed with CMOS input devices. It is designed to not exhibit phase inversion when the input pins exceed the supply voltages. The maximum voltage that can be applied to the input pin is 0. 3V (VSS) to +0. 3V (VDD). Input voltages that exceed this absolute maximum rating can cause excessive current into or out of the input pins. Current beyond ±2 mA can cause reliability problems. Applications that exceed this rating must be externally limited with a resistor to the input pin. (pin 3), which is an analogue input, should be at a voltage between...

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