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OpenSprinkler 3.x uses ESP8266. ESP8266 doesn’t have quite enough GPIO pins that’s why OpenSprinkler uses PCA9535 IO expander chip.
I just finish the board base on opensprinkler hardware on github. I run into an issue that the esp8266 not bootup. Every time power on the blue led one flash and nothing happen. I flash and test the esp8266 before solder to the board. I had 3.3vdc on Reset pin, 3.3vdc CH_PD, 3.3vdc GPIO16,0 vdc GPIO15 and 3.3vdc GPIO0. Can some one help me out or let me what is the issue it will great help? Thanks.
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