LucidTronix is a new Open-Source Electronics designer. We make
tutorials,
as well as transparent, beautiful, and lucid
devices.
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about us here.
Arduino Lamp
Control a 120v outlet with a 5V arduino.
This multisense lamp can be triggered by a timer, sound (like a clapper), or touch. We use an electromechanical relay and an npn transistor to control the 120V outlet from the arduino. Sparkfun sells this
small relay
as well as a
larger one
that lets you control up to 5 AMPs!! with lil ol' arduino. This tutorial describes how to control high voltage AC with a low voltage DC microcontroller
Be Careful!! High voltage can hurt you! Only solder on unplugged devices and test all connections before plugging anything into the mains power. Proceed at your own risk, friend
.
Incandescent Silkscreen
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Incandescent SilkscreenThe lightbulb shaped PCB can control a lightbulb! The electret microphone allows the light to be triggered by sound like a clapper. Or use the potentiometer to put the lamp on a timer. Or program it yourself to listen to whatever you want! It can be programmed with arduino and it is totally hackable. -
SchematicThis is the electrical schematic for the bulb-shaped arduino lamp. It may look intimidating, but the main things to see are that we have four LEDs to show the lighting mode, the relay on pin 8 or PB0 in Atmel Datasheetese, Power switch, potentiometer on analog pin 0, electret microphone ( check out this tutorial to learn more ) hooked up to analog pin 1 through the LM386 amplifier. -
Lamp OffThis is the lamp with its plexiglass covering when it the relay is switched off. -
Lamp On!The electromechanical relay is in the on position an the compact fluorescent bulb is illuminated! -
Board DesignThis is the printed circuit board file (.brd in eagle). -
Sun PlexiHere at LucidTronix we are really into sun worship. This plexiglass lamp covering is laser cut to look like a shining yellow sun. Want to see another sun inspired project? Check out the Sun Kit !
The lightbulb shaped PCB can control a lightbulb! The electret microphone allows the light to be triggered by sound like a clapper. Or use the potentiometer to put the lamp on a timer. Or program it yourself to listen to whatever you want! It can be programmed with arduino and it is totally hackable.
Arduino Lamp Video
Watch the arduino lamp in action! Here we demonstrate the toggle button and the sound mode. The code also allows for a timer mode which we do not demonstrate in the video.
Toggle Relay Code
This code snippet just toggles the electromechanical relay on and off every 4 seconds.
Download File
/* LucidTronix Arduino Lamp * http://www.lucidtronix.com/tutorials/8 * Toggles an electromechanical relay * Relay connected to pin 8 on arduino */ int relay_pin = 8;boolean relay_on = false; // the current state of the lightvoid setup() // run once, when the sketch starts { pinMode(relay_pin, OUTPUT);}void loop() // run over and over again{ digitalWrite(relay_pin, relay_on); delay(4000); // wait 4 seconds relay_on = !relay_on; // if relay is true make it false // if it is false make it true}
Full Code
This is the code that drives the multi-sensing arduino lamp. Basically there are three modes: button, sound, and timer. As you spin the potentiometer you select different modes. In button mode every time you press the tactile switch at the bottom of the PCB the relay toggles. In sound mode every time you sustain a loud enough volume for a few moments the relay switches. Lastly, in the timer mode, the processor toggles on and off after waiting for an interval whose size depends on the current position of the potentiometer. So if you twist the pot all the way to the right the light will toggle on and off every hour, but if you leave the pot in the middle the light will switch every five seconds or so.
Download File
/* LucidTronix Arduino Lamp * http://www.lucidtronix.com/tutorials/8 * Toggles an electromechanical relay * Relay connected to pin 8 on arduino * 3 light modes: sound, tactile toggle, and timer. */ int leds[] = {16,17,18,19};int rgb_pins[] = {3,5,6};const int buffer_size = 30;int noises[buffer_size];int cur_index = 0;.int pot_pin = 0;int sound_pin = 1;int mode = 0;int btn_pin = 4;int modes = 4;int wait = 0;int relay_pin = 8;boolean relay_on = false;unsigned int last_timer_switch = 0;unsigned int sound_switch = 0;void setup() // run once, when the sketch starts{ pinMode(relay_pin, OUTPUT); for(int i = 0 ; i < modes; i++ ) pinMode(leds[i], OUTPUT); for(int i = 0 ; i < 3; i++ ) pinMode(rgb_pins[i], OUTPUT); pinMode(btn_pin, INPUT); for(int i = 0 ; i < modes; i++ ) digitalWrite(leds[i], HIGH); delay(1200); for(int i = 0 ; i < modes; i++ ) digitalWrite(leds[i], LOW);}void loop() // run over and over again{ for(int i = 0 ; i < modes; i++ ) digitalWrite(leds[i], LOW); if (mode == 0) button_mode(); if (mode == 1) sound_mode(); if (mode == 2 || mode == 3) timer_mode(); if (relay_on) digitalWrite(relay_pin, HIGH); else digitalWrite(relay_pin, LOW); int val = analogRead(pot_pin); for(int i = 0 ; i < modes; i++ ){ if ( val > i*256 && val < (i+1)*256) mode = i; }}void sound_mode(){ for(int i = 0 ; i < modes; i++ ) digitalWrite(leds[i], LOW); noises[cur_index] = analogRead(sound_pin) >> 4 ; cur_index = (cur_index + 1) % buffer_size; int var = variance(noises, buffer_size); for(int i = 0 ; i < modes; i++ ){ if ( var > (i+1)*128 ) digitalWrite(leds[i], HIGH); } if (var > 512 && millis() - sound_switch > 1000 ) { relay_on = !relay_on; sound_switch = millis(); } delay(20); }void button_mode(){ digitalWrite(leds[0], HIGH); if ( digitalRead(btn_pin) == HIGH) { relay_on = !relay_on; }}void timer_mode(){ digitalWrite(leds[2], HIGH); wait = analogRead(pot_pin); wait *= 10; if ( millis() - last_timer_switch > wait) { relay_on = !relay_on; last_timer_switch = millis(); }}int average(int* array, int length){ int sum = 0; int i; for(i = 0; i < length ; i++){ sum += array[i]; } int avg = sum / length ; return avg;}int variance(int* array, int length){ int dif_sum = 0; int i; int mean = average(array, length); for(i = 0; i < length ; i++){ dif_sum += ((array[i] - mean)*(array[i] - mean)); } int var = dif_sum / length ; return var;}
Download EAGLE files and code
Here you can download a zipped package with the eagle files and the arduino code. This package contains the .brd board file, the .sch schematic file and the .ino arduINO file.
Click Here to Download: Download EAGLE files and code
Parts
| Title | Description | # | Cost | Link | Picture |
| Arduino Lamp PCB | This light-bulb-shaped PCB holds an electromechanical relay so it can control 120V power with arduino. | 1 | $7.0 | Link |
|
| ATMEGA168A-AU | IC MCU AVR 16K FLASH 32TQFPValue:1.8 V ~ 5.5 V 20MHz | 1 | $2.43 | Link |
|
| Relay | Small relay, 5V switching voltage, 250VACValue:SPDT | 1 | $1.95 | Link |
|
| Electret Condenser Microphone | MIC COND ANALOG OMNI -44DBValue: -44dB ±2dB 20Hz ~ 20kHz | 1 | $0.96 | Link |
|
| Potentiometer | POT ROTARY, Linear 10K OHM 9MM SNAPINValue:10k | 1 | $0.76 | Link |
|
| Switch | SWITCH SLIDE DPDT 6VDC 0.3A SMTValue:DPDT | 1 | $0.44 | Link |
|
| LED SMD | LED 3X1.5MM 568NM Green Clear SMDValue:2.2V Green | 5 | $0.18 | Link |
|
| Transistors (BJT) - Single | IC TRANS NPN SS GP 200MA TO-92Value:40V 300mV @ 5mA, 50mA 100 @ 10mA, 1V | 1 | $0.18 | Link |
|
Tutorials
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Rainbow flower necklace using the TLC5940....
Wearable digital compass displays the direction in green LEDs....
Think of it like a shift register for Pulse Width Modulation (PWM)....
Wall-ter is a wall following robot....
Write messages on Liquid Crystal Displays with potentiometers or keyboards....
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