Simple Digital Oscilloscope

 
Attention! The USB used is a surface mount package. When soldering, be careful not to solder the fixing pins poorly.
 
 
First,
 
when soldering the power supply section, solder the power supply first. Test whether the output voltage meets the requirements. The 3.3 regulated power supply uses an ams1117. The two filter capacitors can be tantalum capacitors
. The pin packages of 79L12, 78L12 and 78L05 are different. Please pay attention to the difference. At the same time, pay attention to the temperature during soldering, otherwise the power chip may be damaged.
 
II.
The compensation capacitors of the analog input channel may affect the peak-to-peak measurement. You can choose not to solder them. For relevant information, please refer to the project published by Hardwood Classroom:
[Hardwood Classroom] AFE03 Oscilloscope Signal Source Expansion Board
 
. III. Pin Assignment: The pin
assignment is the same as the project published by Hardwood Classroom, except for some differences in the button and relay pins. You only need to change the port in the code published by Hardwood Classroom to download and use it.
UKEY2: PB2 --> PB7
UKEY3: PD13 --> PB6
UKEY4: PD12 --> PD7
RELAY3: PB8 --> PE7
IV. Housing :
Pay attention to the size when purchasing buttons and encoders, otherwise they may not be able to be installed. If you want to use different models of BNC interfaces, buttons, or encoders, you need to modify the 3D housing.
If you need to install keycaps, you need to modify the top button slot.