This is an old revision of the document!
A 5 meter NeoPixel strip should light up the room.
The first pixel shows is calculated based on something (loudliness in the room, incoming bandwidth, …)
Over time the pixels move to the next and create a pattern based real life events.
A ESP8266 will control the strip and will accept commands over WiFi (UDP)
One UDP port will accept the json data for the current situation. It will also handle the pixel scrolling.
Every client on the network is able to send data to it and impact the mood light.
Light wars incoming!
The ESPP8266 board is a NodeMCU Amica
Depending on your OS you might need a driver.
MacOS caused the most trouble. First you need to make sure to identify the hardware.
... usb 1-2: new full-speed USB device number 7 using uhci_hcd ... usb 1-2: New USB device found, idVendor=10c4, idProduct=ea60 ... usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 ... usb 1-2: Product: CP2102 USB to UART Bridge Controller ... usb 1-2: Manufacturer: Silicon Labs ... cp210x 1-2:1.0: cp210x converter detected
In this case MacOS needs a driver
#include <ESP8266WiFi.h> #include <WiFiUdp.h> #include <ArduinoJson.h> #include <Adafruit_NeoPixel.h> #ifdef __AVR__ #include <avr/power.h> #endif ///////////////////////////// config ///////////////////////////// // Network const char* ssid = "your_wifi_ssid"; const char* password = "our_wifi_psk"; unsigned int localUdpPort = 2342; char incomingPacket[255]; // buffer for incoming packets char replyPacket[] = "message received"; // a reply string to send back // neopixel const int LEDPIN = 15; const int NUMPIXELS = 300; int displayrefresh = 10; ////////////////////////////////////////////////////////////////// // usage examples: // echo "{red:0,green:100,blue:0}" | nc -w 1 -u 192.168.x.x 2342 // echo "{red:32,green:32,blue:0,all:1}" | nc -w 1 -u 192.168.x.x 2342 // echo "{clearall:1}" | nc -w 1 -u 192.168.x.x 2342 WiFiUDP Udp; Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, LEDPIN, NEO_GRB + NEO_KHZ800); void setup() { Serial.begin(115200); Serial.println(); Serial.printf("Connecting to %s ", ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(" connected"); Udp.begin(localUdpPort); Serial.printf("Now listening at IP %s, UDP port %d\n", WiFi.localIP().toString().c_str(), localUdpPort); pixels.begin(); pixels.show(); } void loop() { int red = -1; int green = -1; int blue = -1; int refresh = 0; int all = 0; int clearall = 0; int packetSize = Udp.parsePacket(); if (packetSize) { // Serial.println("Read Packet"); // receive incoming UDP packets // Serial.printf("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort()); int len = Udp.read(incomingPacket, 255); if (len > 0) { incomingPacket[len] = 0; // Serial.printf("UDP packet contents: %s", incomingPacket); // Serial.println("Parse Packet"); StaticJsonBuffer<200> jsonBuffer; JsonObject& json = jsonBuffer.parseObject(incomingPacket); if (!json.success()) { Serial.println("parseObject() failed"); } else { // for (JsonObject::iterator it=json.begin(); it!=json.end(); ++it) // { // Serial.println(it->key); // Serial.println(it->value.asString()); // } red = json["red"]; green = json["green"]; blue = json["blue"]; refresh = json["refresh"]; all = json["all"]; clearall = json["clearall"]; } } // send back a reply, to the IP address and port we got the packet from // Serial.println("send UDP response"); // Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); // Udp.write(replyPacket); // Udp.endPacket(); } // new refresh rate received if (refresh > 0) { Serial.println("new refresh rate received"); displayrefresh = refresh; } // set all pixel to black if clearall was set to 1 if(all == 1) { // Serial.println("set all pixels"); for(int i=0; i<NUMPIXELS; i++) { pixels.setPixelColor(i, pixels.Color(red,green,blue)); } } // set all pixel to black if clearall was set to 1 if(clearall == 1) { // Serial.println("clear all received"); for(int i=0; i<NUMPIXELS; i++) { pixels.setPixelColor(i, pixels.Color(0,0,0)); } } //shift pixels for(int i=NUMPIXELS; i>=0; i--) { uint32_t color = pixels.getPixelColor(i); pixels.setPixelColor(i+1, color); } //set color of Pixel 0 // new color proviced color changed? if (red >=0 || green >=0 || blue >=0) { //read current color uint32_t CurrentColor = pixels.getPixelColor(1); uint8_t CurrentRed = CurrentColor >> 16; uint8_t CurrentGreen = CurrentColor >> 8; uint8_t CurrentBlue = CurrentColor; //if new color < 0 reuse the old color if (red < 0) {red = CurrentRed;} if (green < 0) {green = CurrentGreen;} if (blue < 0) {blue = CurrentBlue;} // Serial.printf("New color LED 0 -> red: %i, green: %i, blue: %i", red, green, blue); pixels.setPixelColor(0, pixels.Color(red,green,blue)); } else { // Serial.printf("no new color"); uint32_t color = pixels.getPixelColor(1); pixels.setPixelColor(0, color); } pixels.show(); delay(displayrefresh); }
The ESP8266 with an Arduino Core provieds a possibility for a OverTheAir Update.
http://esp8266.github.io/Arduino/versions/2.0.0/doc/ota_updates/ota_updates.html
#!/bin/bash IP=192.168.x.x PORT=2342 SLEEP=0.1 while : ; do for i in $(seq 32 -4 0); do echo Led intensity: $i echo "{red:$i,green:0,blue:0}" | nc -w 0 -u $IP $PORT ; sleep $SLEEP done sleep 1 for i in $(seq 32 -4 0); do echo Led intensity: $i echo "{red:0,green:$i,blue:0}" | nc -w 0 -u $IP $PORT ; sleep $SLEEP done sleep 1 for i in $(seq 32 -4 0); do echo Led intensity: $i echo "{red:0,green:0,blue:$i}" | nc -w 0 -u $IP $PORT ; sleep $SLEEP done sleep 1 done
#!/bin/bash GATEWAYIP=192.168.x.1 #Your gateway SNMPCOMMUNITY=public #snmp read community string INTNUMBER=1 #Interface number in SNMP; snmpwalk -v2c -c readcommstring <IP> | grep IF-MIB::ifName MESASURETIME=1 #Time in seconds between messurment INBOUNDBANDWIDTH=300000 #Max Interface bandwidth OUTBOUNDBANDWIDTH=100000 #Max Interface bandwidth MAXBRIGHTNESS=32 #NeoPixel brightness (max value = 255) NEOPIXELIP=192.168.x.10 #IP of your ESP8266 NEOPIXELPORT=2342 #UDP port of your ESP8266 while true; do TIME=$(date +%s) OUT=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifOutOctets.$INTNUMBER | awk '{print $4}') IN=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifInOctets.$INTNUMBER | awk '{print $4}') if [ -z "$OUT" ] || [ -z "$IN" ]; then msg="Unable to retrieve SNMP info." exit 2 else sleep $MESASURETIME TIME2=$(date +%s) OUT2=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifOutOctets.$INTNUMBER | awk '{print $4}') IN2=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifInOctets.$INTNUMBER | awk '{print $4}') if [ "$OUT2" -gt "$OUT" ] || [ "$IN2" -gt "$IN" ] ; then if [ "$TIME2" == "$TIME" ]; then TIME=1 fi DELTAOUT=$(echo "$OUT2-$OUT" | bc) DELTAIN=$(echo "$IN2-$IN" | bc) DELTATIME=$(echo "$TIME2-$TIME" | bc) INPUTBW=$(echo "$DELTAIN/$DELTATIME/1024" | bc) OUTPUTBW=$(echo "$DELTAOUT/$DELTATIME/1024" | bc) echo Inbound: $INPUTBW"KB/s" echo Outbound: $OUTPUTBW"KB/s" INPUTPERCENT=$(echo "$DELTAIN*8/$DELTATIME/$INBOUNDBANDWIDTH" | bc) OUTPUTPERCENT=$(echo "$DELTAOUT*8/$DELTATIME/$OUTBOUNDBANDWIDTH" | bc) echo Inbound %: $INPUTPERCENT"%" echo Outbound %: $OUTPUTPERCENT"%" RED=$(echo "$MAXBRIGHTNESS*$OUTPUTPERCENT/100" | bc) GREEN=$(echo "$MAXBRIGHTNESS*$INPUTPERCENT/100" | bc) echo "{red:$RED,green:$GREEN}" echo "{red:$RED,green:$GREEN}" | nc -w 0 -u $NEOPIXELIP $NEOPIXELPORT else echo "no change" fi fi done