![]() ![]() ![]() MC3479 Stepper Motor Controller with Arduino.Controlling Driveway Lights with the Arduino.Time-Date with Arduino, LCD Display, DS1307 RTC.Testing the Keyes IR Sensor Module with Arduino.The following use obsolete parts and are kept as a reference.Arduino TMP37 Temperature Sensor Tutorial.Arduino MAX7219 Operates 8X8 LED Matrix.Arduino LCD Display using 74164 Shift Register.Arduino Interface MC3479 Stepper Motor Controller.Arduino Controlling 74C164 Shift Register.Solar Panel Battery Charge Controller Switching Circuit.Solar Panel Battery Charge Controller Using Arduino.Solar Panel Charge Controller Using Arduino.Rotary Encoder Using Arduino Hardware Interrupts.L298N Motor Controller Theory and Projects.Connecting the Arduino to a L298N H-Bridge.Considerations for Using Stepper Motors.Easy Driver Micro-Stepper Controller to Arduino.Basic Electronics Learning and Projects.Same schematic using MOC3010 series triac opto-coupler.ĭownload the Arduino code arduino_scr.txt. Q1 used in this test was a S4015L 400 volt SCR that can handle 15 amperes of current. At 3 to 3.5 volts each four in series operate at 12-14 volts. ![]() The LED strings are composed of four high intensity white LEDs in series. R5 limits the gate current of Q1 while R7 and R8 limit the current in the LED strings. The H11C6 contains a LED light source used to fire the light activated silicon-controlled rectifier (LASCR) in order to fire the main power SCR Q1. This in turn fires the SCR at the desired time during the delay time 120 times per second. positive-going pulse is sent to the H11C6 opto-coupler through a 470 ohm resistor. When the power on switch is pressed at Dp4 a 100 uSec. The longer the delay, the less power to the LED strings and less light output. This value is used in a delay routine to determines the firing point of the SCR. (R3 can be a 10k resistor, which is what I used.) When read by the program this 10-bit AD converter will produce a value between. As light intensity increases the resistance of R6 decreases causing the voltage to rise at the junction of R3, R6, and analog to digital converter pin Ad0 on the controller. This illustrates to process with full-wave unfiltered D.C.ĬdS photocell R6 and R3 form a voltage divider. (There's 360 degrees in a sine wave.) See 4N25 Opto-Coupler (PDF file) This pulse is fed to digital pin 2 (Dp2) of the controller to trigger an interrupt when the sine wave passes zero and 180 degrees. The 4N25 opto-coupler provides a narrow 120 Hertz pulse at zero and 180 degrees of the sine wave. Zero crossing pulse from 4N25 in relation to AC sine wave. Diode D2 blocks the filtering effect of capacitor C2, which with U2 supplies positive five volts for the microcontroller. In the main circuit diagram above transformer T1, D1, and D3 produce a positive going pulsating DC with a peak voltage of about 18 volts and a frequency of 120 Hertz. We must use pulsating DC or the SCR won't operate properly. While in this circuit I use the Arduino, the concepts should work with any number of micro-controllers using either hardware interrupts or polling. In this circuit we demonstrate how to use SCRs to control low-voltage pulsating DC to operate homemade LED light panels. Arduino Controlling Low-Voltage Driveway Lights ![]()
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