Difference between revisions of "Simple USB Oscilloscope"
From Francois Louw
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'''Note: Do not use the prototyping bread boards, where you can plug in and out the wires. They are horrible and especially with USB should not be used. They are basically and array of tiny antennas in there that pics up noise the whole time! If you use them and this doesn't work, then don't blame me! When using Strip Board, make sure to cut the tracks as short as possible on the underside to prevent noise.''' | '''Note: Do not use the prototyping bread boards, where you can plug in and out the wires. They are horrible and especially with USB should not be used. They are basically and array of tiny antennas in there that pics up noise the whole time! If you use them and this doesn't work, then don't blame me! When using Strip Board, make sure to cut the tracks as short as possible on the underside to prevent noise.''' | ||
| − | + | Here is the schematic. | |
[[File:placeholder.png|left|300px]] | [[File:placeholder.png|left|300px]] | ||
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The analog input part is a simple offset and divider circuit. It divides the input voltage into a range of 3.3 Volts and offsets it to allow negative input voltages. | The analog input part is a simple offset and divider circuit. It divides the input voltage into a range of 3.3 Volts and offsets it to allow negative input voltages. | ||
| + | |||
| + | The voltage regulator is a simple linear low drop off regulator from ST Microelectronics. Any other regulator can also be used to drop the voltage to 3.3V. | ||
==Firmware== | ==Firmware== | ||
