Introduction: Solar Tracker Without Arduino Under 700/-

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In this tutorial we are going to build a solar tracker without using Arduino.

Components required –

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Step 1: LDR Module

The Digital LDR Module is used to detect the presence of light / measuring the intensity of light. The output of the module goes high in the presence of light and it becomes low in the absence of light. The sensitivity of the signal detection can be adjusted using the potentiometer.

Use it to detect the light brightness in your environment and decide to switch OFF or ON light? Or maybe to adjust the brightness of LED of your house?

You can adjust the threshold (sensitivity) of digital output by tuning the on-board variable resistor (potentiometer). Simple usage as it is the digital output, so you will know is the light present and decide what to do with it.

Comes with an M3 mounting hole for ease of attaching it to an object. On board, it provides an LDR, high sensitivity and commonly being used for light detection. The module comes with power LED and status LED as an indicator.

LDR Module Photosensitive resistor module most sensitive to environmental light intensity is generally used to detect the ambient brightness and light intensity.

How it works

1. Module light conditions or light intensity reach the set threshold, DO port output high when the external ambient light intensity exceeds a set threshold, the module D0 output low;

2. Digital output D0 directly connected to the MCU, and detect high or low TTL, thereby detecting ambient light intensity changes;

3. Digital output module DO can directly drive the relay module, which can be composed of a photoelectric switch;

4. Analog output module AO and AD modules can be connected through the AD converter, you can get a more accurate light intensity value

Pin details VCC ↔ 3.3V to 5V DC

GND ↔ Ground

DO ↔ Digital Output

AO ↔ Analog Output

Features :

  • LM393 based design
  • Can detect ambient brightness and light intensity
  • Adjustable sensitivity (via blue digital potentiometer adjustment)
  • Output Digital – 0V to 5V, Adjustable trigger level from preset
  • Output Analog – 0V to 5V based on light falling on the LDR
  • LEDs indicating output and power

Step 2: L293D Motor Driver Module

Motor Driver – L293D Driver Module is a medium power motor driver perfect for driving DC Motors and Stepper Motors. It uses the popular L293 motor driver IC. It can drive 4 DC motors on and off, or drive 2 DC motors with directional and speed control.

The driver greatly simplifies and increases the ease with which you may control motors, relays, etc from micro-controllers. It can drive motors up to 12V with a total DC current of up to 600mA.

You can connect the two channels in parallel to double the maximum current or in series to double the maximum input voltage. This motor driver is perfect for robotics and mechatronics projects for controlling motors from micro-controllers, switches, relays, etc. Perfect for driving DC and Stepper motors for micro-mouse, line following robots, robot arms, etc.

Note: Image may vary from actual product in terms of Design according to the availability.

Features :

  • Wide supply voltage: 4.5 V to 12 V.
  • Max supply current: 600 mA per motor.
  • The driver two holes of 3 mm dia.
  • Male burg-stick connectors for supply, ground and input connection.
  • Screw terminal connectors for easy motor connection.
  • High noise immunity inputs.

Step 3: Circuit Diagram

The circuit diagram is given above.

Motor is driven by 9V or 6V battery and LDR Module is powered through 5V on the L293D Module.


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