I'm new here. I've been developing a make shift visible light absorbency spectrophotometer. Currently I've been using analogue components but to get the battery life up to something respectable it will cost more than an arduino looks like it would cost.
Here is the current functions of the project:
- be asleep...conserve precious amps
- if water is present, the moisture sensor looks good, turn on.
- light up an LED.
- receive a voltage from a photo-diode opposite the LED, which the sample sits in between.
- turn on one of 4 different LEDs depending on the voltage received from the photo diode.
- when water is no longer present, go back to sleep.