Practice making DIY- GC 0 149 --- Bluetooth APP automatic range multimeter
Design based on STM32 single-chip microcomputer--- Bluetooth APP automatic range multimeter
2. Function introduction:
STM32F103C series minimum system board + LCD1602 display + analog switch signal selection circuit + voltage acquisition circuit + current measurement circuit (constantan wire sampling) + resistance measurement circuit + 1 black common terminal + 3 red (voltage current resistance input terminals) + Buzzer + 1 measurement type selection button + HC-05 Bluetooth module (only available in Bluetooth version)
1. Voltage: The measuring range is DC 0~+30V, including 0~1V and 1V~30V. Two gears, through internal simulation, the switch automatically selects the appropriate range according to the input voltage. The signal magnification of different ranges is different. Display DianYa-V, 0~1V display xxxxmV, 1V~30V display xx.xV.
2. Current: Measuring range DC 0~+1A, 0~0.1A and 0.1~1A. Two gears, through the internal analog switch, automatically select the appropriate range according to the size of the input DC. The signal magnification of different ranges is different. Display DianLiu-A, 0~0.1A display xxx.xmA, 0.1~1A display xxxxmA.
3. Resistance (with on-off alarm): 0~1K, display DianZu-R xxxx.xR, when the resistance exceeds 9999.9R, display ----.-R, when the measured resistance is less than 50 ohms, the buzzer Call the police. Indicates that the current resistance is low.
4. Select to measure voltage, resistance, and current by pressing the button. Note that the red test lead can only be inserted into the voltage port when measuring voltage, the red test lead can only be inserted into the resistance port when measuring resistance, and the red test lead can only be inserted into the current port when measuring current. Mistakes can burn the device.
5. When measuring voltage, connect the black test lead to the negative pole and the red test lead to the positive pole. There is a risk of burning if connected incorrectly.
6. Voltage, resistance, and current are measured using the 12-bit ADC inside the microcontroller. The overall measurement has certain errors, which can only roughly reflect the voltage, resistance, and current. The specific accuracy is subject to the display accuracy of the functional video, and can be customized as required for higher accuracy requirements.
7. Communicate with the mobile APP through the HC-05 Bluetooth module. The mobile APP can select the measurement type and display the measurement results.
3. Details:
Video explanation: Bilibili searches for the UP master "love to engage in single-chip microcomputer" and searches for the keyword " Bluetooth APP automatic range multimeter " in its space to watch the detailed explanation of the video
Function demonstration operation :
This is an automatic range multimeter based on STM32 microcontroller Bluetooth APP . STM32F103C series minimum system board + LCD1602 display + analog switch signal selection circuit + voltage acquisition circuit + current measurement circuit (constantan wire sampling) + resistance measurement circuit + 1 black common terminal + 3 red (voltage current resistance input terminals) + Buzzer + 1 measurement type selection button + HC-05 Bluetooth module (only available in Bluetooth version)
1. Voltage: The measuring range is DC 0~+30V, including 0~1V and 1V~30V. Two gears, through internal simulation, the switch automatically selects the appropriate range according to the input voltage. The signal magnification of different ranges is different. Display DianYa-V, 0~1V display xxxxmV, 1V~30V display xx.xV.
2. Current: Measuring range DC 0~+1A, 0~0.1A and 0.1~1A. Two gears, through the internal analog switch, automatically select the appropriate range according to the size of the input DC. The signal magnification of different ranges is different. Display DianLiu-A, 0~0.1A display xxx.xmA, 0.1~1A display xxxxmA.
3. Resistance (with on-off alarm): 0~1K, display DianZu-R xxxx.xR, when the resistance exceeds 9999.9R, display ----.-R, when the measured resistance is less than 50 ohms, the buzzer Call the police. Indicates that the current resistance is low.
4. Select to measure voltage, resistance, and current by pressing the button. Note that the red test lead can only be inserted into the voltage port when measuring voltage, the red test lead can only be inserted into the resistance port when measuring resistance, and the red test lead can only be inserted into the current port when measuring current. Mistakes can burn the device.
5. When measuring voltage, connect the black test lead to the negative pole and the red test lead to the positive pole. There is a risk of burning if connected incorrectly.
6. Voltage, resistance, and current are measured using the 12-bit ADC inside the microcontroller. The overall measurement has certain errors, which can only roughly reflect the voltage, resistance, and current. The specific accuracy is subject to the display accuracy of the functional video, and can be customized as required for higher accuracy requirements.
7. Communicate with the mobile APP through the HC-05 Bluetooth module. The mobile APP can select the measurement type and display the measurement results.
Watch the video for a detailed introduction to the specific test method. . .
To learn more, please watch the video explanation. . .
