Smart Car Speed Measurement Module Code Disc Count Speed Sensor with Indicator Light
- Stock: In Stock
- Model: ST230041825
- SKU: ST230041825
$2.99
Ex Tax: $2.99
Wiring:
1. +5
+5 is the positive input port of the power supply, which can be connected to a voltage of 3.3V~5V
2. GND
GND is the negative input port of the power supply
3. OUT
OUT is the signal output port, which is connected to the I/O port of the MCU, generally connected to an external interrupt
Note: Arduin0 should set the I/O port of MCU to input mode/receive mode, otherwise it cannot be used.
For other MCUs, or more advanced control boards such as Arm, if you want to set the I/O port to input/output mode, you must set it to input mode/receive mode, otherwise it cannot be used.
The 51 series MCU can be used directly without setting the input and output mode.
Programming:
The OUT port of the speed measurement module is connected to the external interrupt port of the MCU, and it is an external buffer whenever an infrared ray is turned on.
Measuring distance:
The output of the speed sensor is a pulse signal, and each pulse is interrupted once; when the infrared ray is turned on, it is a low level, so we set the interrupt as a low-level touch mode. Generally, there are integer grids on the code disc. No matter how many grids there are, the principle is the same. For example, a 10-grid code disc means that there are 10 blank grids. After the motor rotates once, the ray is turned on 10 times, and the external low-level touch method is 10 times. ;
After installing the above ideas, our speed sensor can play an effect. We know that there are 10 interruptions in one circle, so we calculate the number of interruptions, and the total number of times obtained is divided by 10, which is the number of motor rotations, and then according to the wheel Circumference, calculating how long the wheel is in a circle, you can calculate how far the car has run.
Measuring speed:
According to the idea of distance measurement, we use an MCU timer to calculate how many external interrupts are received in 1 second. For example, if 20 external interrupts are received in one second, we can judge that the speed of the car is 1 second. The wheel turns twice, and then Then calculate the circumference of the wheel, and then you can know the speed of the car in 1 second.
Package includes:
1 x Speed Sensor
