Next step is to correlate the readings with actual light level measurements.
Showing posts with label a/d. Show all posts
Showing posts with label a/d. Show all posts
Tuesday, August 6, 2013
From Midday till Dusk
Light readings taken with the stormTrigger circuit from mid-day until dusk in Songkhla - Thailand.
The graph shows interval (x-axis) and A/D output (y-axis). Readings were taken at 400mS intervals.
Next step is to correlate the readings with actual light level measurements.
Next step is to correlate the readings with actual light level measurements.
Saturday, May 5, 2012
Input & Output
Still in September 2011...
Input specifications:
The A/D input range of the Arduino Uno (Atmega328P) A/D is 0-5V with a range of 0-1023 representing fully dark (0) to fully bright (1023).
Light measurement to allow for ambient light from fully dark up to full sunlight, plus sufficient sensitivity to detect lightning pulses.
Types of light sensor played with were LDR (Light Dependent Resistor) and Photo Transistor.
Output specifications:
While triggering a camera (Canon DSLR to be specific) I do not want any circuit voltages or power of any kind to be passed to the camera external trigger port. In order to prevent this an optically isolated Solid State Relay was reviewed. Two devices were looked at (ASSR1219 and ASSR1228) as they are dual channel devices with low power requirements and with the control current set properly, they are very fast acting.
Circuit testing to be done.
Full information of the awesome Arduno microcontrollers can be found by following the link below:
http://arduino.cc/en/
Input specifications:
The A/D input range of the Arduino Uno (Atmega328P) A/D is 0-5V with a range of 0-1023 representing fully dark (0) to fully bright (1023).
Light measurement to allow for ambient light from fully dark up to full sunlight, plus sufficient sensitivity to detect lightning pulses.
Types of light sensor played with were LDR (Light Dependent Resistor) and Photo Transistor.
Output specifications:
While triggering a camera (Canon DSLR to be specific) I do not want any circuit voltages or power of any kind to be passed to the camera external trigger port. In order to prevent this an optically isolated Solid State Relay was reviewed. Two devices were looked at (ASSR1219 and ASSR1228) as they are dual channel devices with low power requirements and with the control current set properly, they are very fast acting.
Circuit testing to be done.
Full information of the awesome Arduno microcontrollers can be found by following the link below:
http://arduino.cc/en/
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