I was experiencing my temp/humidity/solar board registering elevated temperatures when I supplied it with external power. Withoput external power the temperature readings were fine. But I ended up needing external power to get reliable 1-Wire sensor readings. I did some research/testing and have some additional information that helped me solve the problem (at least for me).
I used a temperature probe and discovered that the C1 electrolytic capacitor on the temp/humidity/solar board was getting warm when I supplied external power. On a cold day it was noticeably warm to the touch, and my temperature probe showed that it was warmer than the rest of the board. I purchased a few new DS18S20 temperature sensors to experiment with. I removed the old DS18S20 from the board and attached some short wires to the bottom of the board (rather than the top) and a new DS18S20 extended an inch or so away from the board. Now all my temperature readings are within a degree or less of each other. And I only destroyed one DS18S20 in the process as well.
I'm going to leave it running and montor it for a while to make sure the readings stay consistent and I don't get a lot of errors. Then I can move on to the rain gauge I just received this week!
I used a temperature probe and discovered that the C1 electrolytic capacitor on the temp/humidity/solar board was getting warm when I supplied external power. On a cold day it was noticeably warm to the touch, and my temperature probe showed that it was warmer than the rest of the board. I purchased a few new DS18S20 temperature sensors to experiment with. I removed the old DS18S20 from the board and attached some short wires to the bottom of the board (rather than the top) and a new DS18S20 extended an inch or so away from the board. Now all my temperature readings are within a degree or less of each other. And I only destroyed one DS18S20 in the process as well.
I'm going to leave it running and montor it for a while to make sure the readings stay consistent and I don't get a lot of errors. Then I can move on to the rain gauge I just received this week!