Great to hear that the value for the C7 does not really matter. I did have the D1 in backwards. after i replace the buck converter and flipped the D1 I found that the the biggest problem i had was a short on D3. now got a question; would a short (D3) that linked the 5V to ground kill the DS1307 RTC? Current i got power the the raspberry pi and the OS loaded. I can turn on each station and everything looks good, but the raspberry PI can not detect the RTC.