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  1. So, finally my DIY arduino SQM is finalized, it is not calibrated yet, but hang in there, i will do so in the near future... But first i want to point out that i didn't want any scientific grade SQM but just a simple tool that i can use to compare different photo-sites around my home-town here in Sweden Feel free to Use it as you want to, if you wan't to calibrate it, change the value at: const float A = 22.0; More pictures and code are available at SGL's Yahoo-site. The parts needed for this is: Arduino approx. 30USD Light to freq-sensor: TSL237 - electrical component shop 5 USD 0.1-0.01uF capacitator 20 degree lens - ebay 1USD UV/IR-cut filter between the lens and the sensor - ebay 1 USD Some kind of housing and cables/connectors The lens is mounted to a plastic cover with superglue, the UV/IR filter is mounted underneath it and underneath that, the sensor. The sensor has three connectors, one gnd, one vdd and one signal, so it quiet simple to connect, you should use a capacitator to stabilize the +5v. Here is a video of it how it works (not the best quality i'm afraid. And here is the code: The libraries you need is at the top of the code. // Author: Daniel Sundström and Ola Karlsson, Arvika, Sweden #include <FreqMeasure.h> #include <Math.h> #include <LiquidCrystal.h> float Msqm; const float A = 22.0; int buttonSQM = A2; int val = 0; int reading = 0; int percentage = 0; LiquidCrystal lcd (12, 11, 10, 9, 7, 6); void setup() { pinMode(buttonSQM, INPUT_PULLUP); digitalWrite(buttonSQM, HIGH); lcd.begin(16,2); Serial.begin(19200); } double sum=0; int count=0; void loop() { val = digitalRead(buttonSQM); if (val == LOW) { reading = 1; lcd.clear(); FreqMeasure.begin(); while(reading) { if (FreqMeasure.available()) { // average several reading together sum = sum + FreqMeasure.read(); count +=1; percentage = count/31.0*100.0; lcd.setCursor(0,0); lcd.print("Reading"); lcd.setCursor(8,0); lcd.print(percentage); lcd.setCursor(11,0); lcd.print("%"); if (count > 30) { double frequency = F_CPU / (sum / count); sum = 0; count = 0; Msqm = A - 2.5*log10(frequency); //Frequency to magnitudes/arcSecond2 formula lcd.clear(); lcd.setCursor(0,0); lcd.println("Mag/As2: "); lcd.setCursor(9,0); lcd.print(Msqm); delay(5000); lcd.clear(); reading = 0; FreqMeasure.end(); } } } } }
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