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Hi!
I am thinking about buying a v3 controller to keep an extra just in case. Would an old expansion board from my v2.3 work with a new controller?Thanks,
Sergeiv3 controller only works with expander version 3, so unfortunately the previous expanders (2.x) will not work with v3 controller.
Why the change? I bought off Amazon, wasn’t a choice for 2.X so I got the wrong one.
How is addressing determined one v2? No jumper…You can get all versions of expander from our website:
https://opensprinkler.com/product/zone-expander/On v2 there is no jumper for addressing because it uses shift register cascading, so the order of zones is completely determined by the order the expanders are linked.
V3 uses I2C IO expanders because ESP8266 does not have enough GPIO pins to talk to shift registers and I2C is the most efficient way to support expanders using only 2 signal lines.
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