Lets begin with another cool instructable. In this Instructable we will learn how to control the position of Servo Motor using Accelerometer with NodeMCU.
Step 1: Things to Be Collected
To begin with this instructable all you need is :
Hardware Requirement
- ADXL335 : Accelerometer Sensor
- NodeMCU
- Servo Motor
- Connecting Wires ( Optional )
- Bread Board
- Jumper Wires
- Micro USB Cable
Software Requirements
- Arduino IDE
Step 2: Description
Servo motors are great devices that can turn to a specified position.
Usually, they have a servo arm that can turn 180 degrees. Using NodeMCU, we control a servo to go to a specified position. As simple as that!
ADXL335 is 3v compatible device. It has three outputs for each axis, i.e. X, Y & Z these are analog outputs.
In my previous Instructables you would have seen how to connect a servo motor and then how to turn it to different positions and how to interface accelerometer.
If you didn’t see my previous Instructable, then you can click the link below to check those Instructables.
Interfacing Servo Motor With NodeMCU by TheCircuit
Interface Accelerometer With NodeMCU by TheCircuit
Step 3: Circuit Connections
Connection to Servo
Orange wire connects to Digital Pin D2.
Brown wire connects to GND Pin.
Red wire connects to 3v3 Pin.
Connections to Accelerometer
VCC – To be connected to NodeMCU +3.3v.
X – To be connected to Analog Pin A0.
GND – To be connected to Ground Pin (GND).
To get started with coding you need to
- Download Arduino IDE
- Setup NodeMCU
Step 4: Coding Time
/* Control Servo Motor using Accelerometer By TheCircuit*/ #include <Servo.h> // add servo library which is present in Arduino IDE Servo myservo; // create servo object to control a servo int xpin = A0; // analog pin used to connect the Accelerometer int pos; // variable to read the value from the analog pin</p>
void setup() {
myservo.attach(2); // D4
}
void loop() {
pos = analogRead(xpin); // reads the value of the accelerometer (value between 0 and 1023)
pos = map(pos, 380, 555, 0, 180); // scale it to use it with the servo (value between 0 and 180)
myservo.write(pos); // sets the servo position according to the scaled value
delay(15); // waits for the servo to get there
}
Download the “Accelerometer_Servo.ino” file and open it up in the Arduino IDE.
Then Create a new sketch and paste the code below in the Arduino IDE and hit Upload.
The code will take a few minutes to upload and then you will see the servo changing angle from 0° to 180° at the interval when the accelerometer is tilted in X-axis.
You can also choose Y and Z axis by connecting to analog pin A0.
Step 5: Output Demonstration
Spending a bit more time on tweaking the X-axis constants would give us a better result.
That’s it for now Makers.
Thanks for your time. Don’t forget to leave your thoughts in the comments section.
Source: Control Servo Motor Using Accelerometer
