- #1
Howsomever
- 4
- 0
Hello Wizards,
I am using a circuit with a photoresistor that sits under the eave and senses ambient light to turn on a light at night to shine on an American Flag. This works fine for a month or two and then quits working. What I find is the photoresistor goes bad. Ambient light in the shop the photoresistor is approx 8K ohms and when I cover it it goes to 2 meg ohms. After the photoresistor goes bad I find at ambient light in the shop it is 2.7k ohms and when I cover it it goes to 3.7k ohms. After going through three of these photoresistors I wonder if moisture is the cause. I will say it works fine night after night than just quits. Thinking moisture or humidity is the culprit I coated my last replacement photoresistor in epoxy. Any thoughts or comments?? The power source for the circuit is a 1000amp hour battery charged by a 75watt solar panel. Outside temperatures at this time of the year are in the 40's.
Thanks in advance for any responses,
I am using a circuit with a photoresistor that sits under the eave and senses ambient light to turn on a light at night to shine on an American Flag. This works fine for a month or two and then quits working. What I find is the photoresistor goes bad. Ambient light in the shop the photoresistor is approx 8K ohms and when I cover it it goes to 2 meg ohms. After the photoresistor goes bad I find at ambient light in the shop it is 2.7k ohms and when I cover it it goes to 3.7k ohms. After going through three of these photoresistors I wonder if moisture is the cause. I will say it works fine night after night than just quits. Thinking moisture or humidity is the culprit I coated my last replacement photoresistor in epoxy. Any thoughts or comments?? The power source for the circuit is a 1000amp hour battery charged by a 75watt solar panel. Outside temperatures at this time of the year are in the 40's.
Thanks in advance for any responses,