STM32 simple instrumentation

1. Product Introduction

A simple gadget based on a simple oscilloscope, simple function signal generator, resistance measurement, adjustable power supply, and output current measurement.

2. Application scenarios

1. For electronics enthusiasts or students majoring in electronics for reference study or daily use

3. Product overview

A simple instrument and meter based on STM32F103RCT6, with simple oscilloscope, simple function signal generator, resistance measurement, adjustable power supply, output current measurement and other functions. Adjustable power output, resistance measurement, and signal output all use DC interface output, and oscilloscope signal input is MCX interface input, which can be directly plugged in when using, which is very convenient.

4. Product parameters

1. PCB length and width: 82.55mm*53.975mm.

2. Final thickness: <2cm.

3. Oscilloscope sampling rate: <=600K, measurement range +-40V, minimum resolution 0.1mV, inherent ripple about 0.5mV.

4. Resistance measurement range: 0~10M, accuracy +-1%.

5. Adjustable power supply output voltage: 3.7~13V, output current <1A.

6. Output current measurement range: 0~1.65A, resolution 0.8mA, accuracy +-1.6mA.

PCB front:

STM32 simple instrumentation hardware project Figure 1

The reverse side of the PCB:

STM32 simple instrumentation hardware project Figure 2

5. Instructions for use

1. This product currently only supports the basic measurement functions of the oscilloscope. The sampling rate, unit voltage, and coupling mode of the oscilloscope can be set through the four side buttons on the right. The two buttons on the right are setting buttons, and the two buttons on the left are selection buttons. The above-mentioned other functions have been supported on the hardware, and the software will be modified to add other functions when there is time.

2. This product needs to be used by burning firmware. For the program source code, please refer to STM32 Simple Instrument Source Code.V1.4.

3. This module alone cannot be used, and it needs to be equipped with 2.8-inch 18PIN plug-in TFT color screen (ST7789V, without touch), lithium battery (recommended 104060-3000MAH lithium battery), copper pillars and other accessories. It is recommended to use PCB to fix the color screen, please refer to the attached STM32 simple instrument display.

6. Remarks

1. All the information of this product has been released at present, but it is only a semi-finished product at present. You can watch the "test video" for the current version display effect. If you want to reproduce it, choose carefully.

2. The BOM list does not contain all the components. For SMT, please note that the complete bom + purchase reference information for some components has been placed in the attachment.

3. Lithium batteries, TFT color screens, copper pillars and other related accessories are not included in the BOM. For specific models and purchase links, please refer to the attached STM32 simple instrument accessories list (for reference only).

7. Electric measurement effect diagram

(The frequency and duty cycle are not shown in the picture, the firmware was not written at that time, and the uploaded version can be displayed now)

1. Intrinsic ripple 2. 5mV, 10K sine wave 3. 100mV, 1K triangle wave

STM32 Simple Instrumentation Hardware Project Figure 3STM32 Simple Instrumentation Hardware Project Figure 4STM32 Simple Instrumentation Hardware Project Figure 5

4. 5V, 100HZ Lorentz 5. 20V, 100HZ rectangular wave

STM32 simple instrumentation hardware project Figure 6STM32 simple instrumentation hardware project Figure 7