Build Instructions

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• 1

  Soldering required
• 2

  AVR programming required

  This project uses the TinySnore library. The program was uploaded using Arduino as ISP.

  #include <tinysnore.h> // Low power library; not needed (avr/sleep.h), but makes it simpler const byte ledsPin = 1; // Low If LED-resistor combination allows to stay well under the 20mA output limit const byte beaconPin = 0; const byte ldrpwrPin = 2; // Pin to 'power up' the LDR only while we read the voltage const byte ldrdataPin = 3; // Voltage read void setup() { pinMode(ledsPin, OUTPUT); pinMode(ldrpwrPin, OUTPUT); pinMode(beaconPin, OUTPUT); pinMode (4, INPUT_PULLUP); // Save some power, probably redundant } void loop() { digitalWrite(ldrpwrPin, HIGH); // Power up the LDR delay(5); // Stabilize int sensorValue = analogRead(ldrdataPin); // Read LDR at voltage divider digitalWrite(ldrpwrPin, LOW); // Power down LDR if (sensorValue <= 300) { // Modify value to make it more or less sensitive to light (0-1023) digitalWrite(beaconPin, HIGH); digitalWrite(ledsPin, HIGH); delay(15); // The beacon is flashing digitalWrite(beaconPin, LOW); snore(1000); // Go to sleep with the position lights ON; change value to } // change flashing interval else { digitalWrite(ledsPin, LOW); snore(3000); // Go to sleep with the position lights OFF; increase } // value to save power but it'll be less reactive delay(10); } 

• 3

  Preparation

  • Program the ATtiny85, I used Arduino as ISP.
  • Print the circuit guide (black&white), place it beneath the glass and replicate it over the glass with thin copper tape. If the adhesive side is non-conductive, solder the tape joints. Use flux and low temperature or you’ll burn the tape.
  • Use the schematic and footprint diagram (black&red) as a guide to place and solder the components. Start with the pin headers (bend them inwards a little with pliers to give them enough tension to hold the coin cell, and sand the plastic protector on the bottom to make it sit right) and work your way out to the edges.

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